Dynamic Braking Patents (Class 318/375)
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Patent number: 8941338Abstract: An electric braking device for printing material processing machines includes at least one electric drive to be braked that is supplied by a power converter in motor operation and is braked by the power converter in generator operation. A control unit switches on a redundant electric braking device in the case of a failure of the power converter by using a switch. The braking device has at least two braking stages, an additional switch for actuation in at least two stages, and at least one brake resistor. In the circuit of the redundant electric braking device, a braking current is measured and the measured value is fed to a comparator for comparing the actual braking current to a desired braking current. A printing press having the braking device is also provided.Type: GrantFiled: December 9, 2011Date of Patent: January 27, 2015Assignee: Heidlelberger Druckmaschinen AGInventors: Reiner Villhauer, Klaus-Dieter Kleibaumhueter, Josef Reiter, Andreas Schulz
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Patent number: 8928260Abstract: A traction motor system calculates motor flux by generating a real time effective resistance of a resistance grid calculated from motor torque and measured voltage on a DC link. Calculating effective resistance avoids solely relying on DC link voltage, which can be influenced by conditions such as wheel slip and drop out of one or more resistance grids. The effective resistance calculation is based on nominal motor values using known power levels and conditions. From these nominal values and the effective resistance, various scaling factors based on actual motor power can be generated and used to adjust a nominal flux reference to more accurately reflect actual motor flux. The scaling factors include power and torque scaling factors and a resistance scaling factor that is active during conditions such as wheel slip.Type: GrantFiled: October 18, 2012Date of Patent: January 6, 2015Assignee: Caterpillar Inc.Inventors: Alexander Cameron Crosman, III, Joshua M. Williams
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Patent number: 8922142Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power.Type: GrantFiled: October 22, 2012Date of Patent: December 30, 2014Assignee: Nidec Motor CorporationInventors: Darko Marcetic, Thomas J. Sheahan
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Patent number: 8917038Abstract: A motor control device has a drive circuit that drives an electric motor with a battery as a power supply, a switch element that is provided between the battery and the drive circuit, the switch element supplying a current from the battery to the drive circuit when being turned on, the switch element cutting off the current from the battery to the drive circuit when being turned off, a rotation speed detector that detects a rotation speed of the electric motor, and a controller that operates the drive circuit to control the electric motor. The controller turns on the switch element when the rotation speed of the electric motor, which is detected by the rotation speed detector, is greater than or equal to a first predetermined value during stopping of the control of the electric motor.Type: GrantFiled: August 8, 2012Date of Patent: December 23, 2014Assignee: Omron Automotive Electronics Co., Ltd.Inventors: Takayuki Fukuoka, Yoshiki Yamagishi, Satoshi Kido, Yasutaka Shirota
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Patent number: 8907601Abstract: A braking apparatus for a vehicle includes a permanent magnet synchronous motor including a rotor having a permanent magnet, and a stator capable of driving the rotor to rotate and configured to couple the rotor to each of at least a pair of wheels of the vehicle; a power accumulating portion that accumulates power to be supplied to the permanent magnet synchronous motor; a conversion control portion that converts the power of the power accumulating portion to excite the stator and control the rotation of the rotor; and an in-phase excitation control portion that applies exciting brake to the wheel by exciting the stator by supplying power in the same phase as the excitation with respect to the stator in the direction of rotation of the rotor according to the control performed by the conversion control portion, wherein the wheel is stopped by the exciting brake.Type: GrantFiled: December 24, 2012Date of Patent: December 9, 2014Assignee: Aisin Seiki Kabushiki KaishaInventors: Akemi Okawa, Masanori Mori
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Patent number: 8890448Abstract: The invention relates to a braking apparatus, an electric drive and an elevator system. The braking apparatus comprises an apparatus for dynamic braking, for braking an electric machine with dynamic braking, an input for the control signal of the braking apparatus, and also a controller, for controlling the apparatus for dynamic braking as a response to the aforementioned control signal of the braking apparatus.Type: GrantFiled: May 2, 2012Date of Patent: November 18, 2014Assignee: Kone CorporationInventors: Esa Putkinen, Antti Kallioniemi, Juha-Matti Nikander, Paavo Merilinna, Risto Komulainen
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Patent number: 8884557Abstract: A method for operating a mains-operated electric motor for a power tool includes connecting a first side of an electric motor to a first mains and connecting a second side of the electric motor to a second mains using first and second switches, respectively, in particular semiconductor switches, and monitoring the operational reliability of the switches using an electronic controller for operating safety.Type: GrantFiled: December 10, 2010Date of Patent: November 11, 2014Assignee: Robert Bosch GmbHInventor: Hans Hermann Rottmerhusen
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Patent number: 8878469Abstract: A process for electrical assistance to the braking of a vehicle with a motor system (M), whereby the motor system (M) includes at least one electric motor (10) whose output shaft (14) is coupled to a primary shaft (20) that drives at least one wheel (22) of the vehicle, at least one wheel (22) of the vehicle being equipped with a mechanical braking device that is activated by a hydraulic circuit, whereby the process is characterized in that it includes: collecting information in the hydraulic circuit of the primary braking circuit, and using the information as a set-point for a braking torque generated by the electric motor (10) and exerted on the primary drive shaft (20) of the wheels.Type: GrantFiled: November 14, 2011Date of Patent: November 4, 2014Assignee: Polaris Sales Europe SARLInventors: Thierry Zerbato, Pascal Duclos
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Patent number: 8872458Abstract: A motor control device has a drive circuit that drives an electric motor with a battery as a power supply, a switch element that is provided between the battery and the drive circuit, the switch element supplying a current from the battery to the drive circuit when being put into an on state, the switch element cutting off the current from the battery to the drive circuit when being put into an off state, a voltage detector that detects a voltage at the drive circuit, and a controller that operates the drive circuit to control the electric motor. The controller turns on the switch element when the voltage at the drive circuit, which is detected by the voltage detector, is greater than or equal to a first predetermined value during stopping of the control of the electric motor.Type: GrantFiled: August 8, 2012Date of Patent: October 28, 2014Assignee: Omron Automotive Electronics Co., Ltd.Inventors: Takayuki Fukuoka, Yoshiki Yamagishi, Satoshi Kido, Yasutaka Shirota
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Patent number: 8857542Abstract: A drive system for a machine having an engine, a generator, a trolley drive arrangement, a motor, wheels and auxiliary devices is provided. The drive system includes an inverter circuit and an auxiliary driver both being operatively connected to the trolley drive arrangement. The inverter circuit may be coupled to each of the generator and the motor. The auxiliary driver may be coupled to each of the generator and the auxiliary devices. The inverter circuit and the auxiliary driver may be configured to automatically communicate power from the trolley drive arrangement and any power from the auxiliary devices to the motor in a trolley propel mode, and automatically communicate power from the motor to the engine, the trolley drive arrangement, and optionally to a hybrid system if applicable, in a dynamic braking mode, while attached to trolley lines so as to eliminate fuel consumption while attached to the trolley lines.Type: GrantFiled: December 8, 2011Date of Patent: October 14, 2014Assignee: Caterpillar Inc.Inventors: Matthew Hendrickson, Donald Gilmore, Eric Ruth
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Patent number: 8847524Abstract: Braking current generated by an electrical motor on mining equipment during a retard interval is switched through one or more grid resistors that are liquid cooled. Under low ambient temperatures, a heating current can be switched through the grid resistors when the electrical motor is not operating in a retard interval. An integrated cooling system can be used to cool grid resistors and power modules. Heat dissipated by the grid resistors and the power modules can be circulated through auxiliary heating loops to heat portions of the mining equipment under low ambient temperatures. Multiple liquid-cooled power modules, liquid-cooled grid resistors, auxiliary heating loops, control modules, radiators, and pumps can be coupled by a liquid distribution system with various combinations of parallel and serial branches. Temperature, pressure, and flow rate in each branch can be independently controlled. Operation of the integrated cooling system can be controlled by a computational system.Type: GrantFiled: September 29, 2011Date of Patent: September 30, 2014Assignee: Siemens Industry, Inc.Inventor: Joy Mazumdar
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Patent number: 8836251Abstract: The present invention relates to a drive system with energy recovery for driving a machine, in particular for driving a crane, wherein the drive system includes at least one fuel cell unit, at least one capacitive energy storage unit and at least one drive motor, and wherein the fuel cell unit and the energy storage unit are connected in parallel and feed at least one drive motor. According to the invention, the capacitive energy storage unit is dimensioned such that the differential voltage occurring during operation between the fuel cell unit and the capacitive energy storage unit is minimized to such an extent that the current caused by the voltage within the parallel connection of fuel cell unit and energy storage unit does not exceed a defined safe limit value, wherein the fuel cell unit and the energy storage unit are directly coupled with each other and with the remaining drive components without DC/DC converter.Type: GrantFiled: February 18, 2011Date of Patent: September 16, 2014Assignee: Liebherr-Components Biberach GmbHInventor: Nejat Mahdavi Tabatabaei
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Patent number: 8823298Abstract: A method of operating a laundry treating appliance to control a rotational speed of a drum to move the laundry within the drum according to a predetermined category of movement.Type: GrantFiled: March 14, 2012Date of Patent: September 2, 2014Assignee: Whirlpool CorporationInventors: Biao He, Qiang Mei, Fabio E. Rosa
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Patent number: 8798826Abstract: A lower limit value setting unit (52) variably sets a lower limit value (Vth) of a target voltage (Vh*) in a range of a voltage that is higher than the maximum value of voltages (Vb1, Vb2) of power storage devices and is not affected by a dead time provided for converters, based on temperatures (Tb1, Tb2) and required electric powers (Pb1*, Pb2*). A maximum value selection unit (53) sets the maximum value among the voltages (Vb1, Vb2) of the power storage devices and required voltages (Vm1*, Vm2*) of motor-generators, as the target voltage. A target voltage limiting unit (54) compares the target voltage with the lower limit value (Vth), and if the target voltage is lower than the lower limit value (Vth), the target voltage limiting unit (54) sets the lower limit value (Vth) as the target voltage (Vh*).Type: GrantFiled: May 26, 2008Date of Patent: August 5, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Shinji Ichikawa
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Publication number: 20140210383Abstract: An electric motor control system includes a motor control circuit for generating a motor control signal and a braking mechanism for adjusting the motor control signal to augment motor losses when the motor control circuit is in a braking mode. The braking mechanism includes a difference component for receiving a first signal containing motor reference speed information, for receiving a second signal containing actual speed information, and for generating a third signal containing information indicating a difference between the reference speed and the actual speed. An integrating component integrates the third signal and generates a fourth signal representing the integrated third signal. The fourth signal may augment a voltage control signal in a voltage-based control circuit or may augment a flux-producing component of a current control signal in a current-based control circuit. The electric motor control circuit may include multiple braking mechanisms for use in different modes of operation.Type: ApplicationFiled: January 30, 2013Publication date: July 31, 2014Applicant: NIDEC MOTOR CORPORATIONInventors: Darko Marcetic, Mile Bozic
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Publication number: 20140203740Abstract: A power conversion device for driving a load, including a power conversion device main body configured to receive an input of a power supply voltage and to drive the load, and a brake circuit configured to protect the power conversion device main body from overvoltage applied thereto. The brake circuit includes a Zener diode that becomes conductive when the voltage applied to the power conversion device main body exceeds a predetermined value, to thereby suppress the voltage.Type: ApplicationFiled: January 14, 2014Publication date: July 24, 2014Applicant: FUJI ELECTRIC CO., LTD.Inventor: Shogo OGAWA
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Patent number: 8749181Abstract: A bicycle regenerative brake control device is provided for controlling a motor, in relation to a brake mechanism that can be mounted on an electric bicycle in which human-powered driving is assisted by the motor. The bicycle regenerative brake control device basically includes a first control part, a second control part and a switch control part. The first control part controls the motor so as to generate a uniform first regenerative braking force. The second control part controls the motor so as to generate a gradually increasing second regenerative braking force upon determining the brake mechanism shifts from an initial state to a braking state. The switch control part switches to a control performed by the second control part in response to the brake mechanism shifting from the initial state to the braking state while control is being performed by the first control part.Type: GrantFiled: June 8, 2011Date of Patent: June 10, 2014Assignee: Shimano Inc.Inventor: Takao Saida
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Patent number: 8742706Abstract: The invention relates to an electronically commutated electric motor. The electric motor comprises a stator, and a rotor, in particular a permanent-magnetic rotor. The electric motor further comprises a control unit connected to the stator. The control unit is designed to actuate the stator such that the stator can generate a magnetic rotating field for rotationally moving the rotor. According to the invention, the control unit of the electric motor is provided with a power output stage having semiconductor switches. Subject to the low-resistance, or short-circuited, semiconductor switch of the power output stage, in particular as a result of defect, the control unit is designed to actuate the stator for generating the rotating field such that during a complete rotor revolution, the rotor can provide a mechanical output, or in the operational mode, a braking torque of the electric motor caused by the defect is reduced, or completely neutralized, by the low-resistance, or short-circuited, semiconductor switch.Type: GrantFiled: February 18, 2010Date of Patent: June 3, 2014Assignee: Robert Bosch GmbHInventors: Torsten Henke, Oliver Wackerl, Ulrich Vollmer, Dirk Lamprecht
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Patent number: 8736219Abstract: The invention relates to an industrial robot having a robotic arm. The robotic arm has several axes (A1-A6) and at least one electric drive, which comprises an electric motor (7-12) and power electronics (16) actuating the electric motor (7-12) and is equipped to move the relevant axis (A1-A6). The industrial robot (1) is equipped to short-circuit the electric motor (7-12) in the event of emergency braking simultaneously by means of two independent electric current paths.Type: GrantFiled: October 29, 2008Date of Patent: May 27, 2014Assignee: KUKA Laboratories GmbHInventors: Josef Hofmann, Richard Schwarz, Sönke Marx
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Patent number: 8736205Abstract: A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor.Type: GrantFiled: November 17, 2010Date of Patent: May 27, 2014Assignee: Siemens AktiengesellschaftInventors: Dirk Hertz, Johann Seitz, Stefan Zitzler
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Patent number: 8736204Abstract: Apparatus for transferring power between an electricity network (UP) operating on alternating-current electricity and a multiphase electric machine (M2, M3), which apparatus comprises low-voltage power cells (CS, C11 . . . CN6) operating on a cascade principle, which power cells comprise a single-phase output connector (OUT), and at least one transformer (TA, T1 . . . TN), comprising for each power cell connected to it a single-phase or multiphase winding dedicated to the specific power cell, which transformer comprises at least one additional winding (WA, WB1 . . . WBN) connected to the same magnetic circuit as the other windings for the purpose of at least one auxiliary circuit, which can be connected to the aforementioned additional winding.Type: GrantFiled: January 3, 2012Date of Patent: May 27, 2014Assignee: Vacon OyjInventors: Nicklas Södö, Risto Komulainen
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Publication number: 20140139151Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a driving waveform to the stator to cause rotation of the rotor; remove the driving waveform from the stator to cause the rotor to coast and eventually stop; apply a stop detection waveform to the stator while the rotor is coasting, wherein the stop detection waveform induces a waveform on the rotor which in turn induces a waveform back to the stator while the rotor is rotating; and monitor the stator to detect a characteristic of the waveform induced back to the stator to detect when the rotor has substantially stopped rotating.Type: ApplicationFiled: November 19, 2012Publication date: May 22, 2014Applicant: Nidec Motor CorporationInventor: Thomas J. Sheahan
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Patent number: 8729764Abstract: A damper circuit for damping a synchronous servo-motor having at least one winding, at least one main damper resistor, connection means for connecting the main damper resistor in series with the winding, and at least one additional damper cell including at least one additional damper resistor connected in parallel with the main damper resistor via a static switch connected to a control module for controlling the switch as a function of a voltage of the winding. The control module has a shunt in parallel with the main damper resistor. The shunt has an output connected to the control input of the switch and a divider bridge connected to the shunt to form a comparator between the voltage of the winding and a conduction voltage of the shunt.Type: GrantFiled: October 7, 2010Date of Patent: May 20, 2014Assignee: Sagem Defense SecuriteInventors: Tony Fourmont, Franck Delnaud, Jérôme Piaton, Roland Casimir
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Patent number: 8710774Abstract: A drive control device for an electric train comprises a switch for connecting or opening direct-current power, a power converter into which the direct-current power is input via the switch between two terminals on an input side and which converts the direct-current power into alternating-current power through a switching action and drives an alternating current rotating machine connected on an output side, and a voltage detector for detecting the voltage between the two terminals. In addition, a power controller is provided that controls the power converter such that when the detected voltage of the voltage detector exceeds a predetermined open-circuit voltage, the switch is opened and the regenerative brake force is reduced by the alternating current rotating machine under a predetermined reduction pattern having a ramp reduction time longer than 0.Type: GrantFiled: December 18, 2009Date of Patent: April 29, 2014Assignee: Mitsubishi Electric CorporationInventor: Kenichi Kusano
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Publication number: 20140111124Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power.Type: ApplicationFiled: October 22, 2012Publication date: April 24, 2014Applicant: Nidec Motor CorporationInventors: Darko Marcetic, Thomas J. Sheahan
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Patent number: 8692489Abstract: A control system for controlling an electrical device of a nacelle, the device having at least one element that is movable to a closed position and an open position. The control system includes at least one electromechanical member for actuating the movable element, a unit for electrically driving the electromechanical actuation member, and a controlling and monitoring unit for controlling the electrical drive unit so as to move the movable element to the closed and/or open position. The control system further includes a system for recovering braking power from the electrical drive unit during the movement of the movable element to the closed and/or open position.Type: GrantFiled: October 11, 2012Date of Patent: April 8, 2014Assignee: AircelleInventor: Hakim Maalioune
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Publication number: 20140084819Abstract: A controller for driving a motor has: an input part that receives, from each of two brake sensors, a signal indicating a corresponding brake is in an ON state or a signal indicating that the brake is in an OFF state; a control coefficient computing part that increases a control coefficient relative to a regeneration target value along a first slope when a first signal indicating only one of the brakes is in an ON state is received from the input part, the control coefficient computing part increasing the control coefficient along a second slope when a second signal indicating both brakes are in an ON state is received from the input part, the second slope rising faster than the first slope; and a control part controlling driving of the motor in accordance with the regeneration target value and the control coefficient computed by the control coefficient computing part.Type: ApplicationFiled: August 21, 2013Publication date: March 27, 2014Applicant: TAIYO YUDEN CO., LTD.Inventors: Yasuo HOSAKA, Satoru SHIMIZU, Kazuo ASANUMA
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Patent number: 8669733Abstract: A power supply circuit for an electric motor, the circuit comprising a plurality of inverter bridge arms, each having means for connection to a respective winding of the motor, each inverter bridge arm comprising in series a first insulated gate bipolar transistor and a junction field effect transistor that are connected to a controller, the circuit including a second insulated gate bipolar transistor connected in series with each field effect transistor and connected to the controller, and a damping resistor connected in parallel with the second bipolar transistor. An aircraft flight control member including a movable airfoil associated with at least one drive motor connected to such a power supply circuit.Type: GrantFiled: March 30, 2010Date of Patent: March 11, 2014Assignee: Sagem Defense SecuriteInventors: Roland Casimir, Tony Fourmont
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Patent number: 8664897Abstract: A motor drive apparatus includes a rectifier which converts AC power to DC power and DC power to AC power, an inverter which converts the DC power output by the rectifier to AC power and supplies the AC power to a motor, and which converts regenerative power from the motor to DC power and returns the DC power to the rectifier, a DC voltage detection unit which detects a DC output voltage of the rectifier, an AC voltage detection unit which detects an AC output voltage of the rectifier, a frequency calculation unit which calculates the frequency of the AC voltage; a storage unit which stores as a reference value the DC voltage at the start of the regenerative operation, and a power failure detection unit which determines the presence or absence of a power failure by using the DC voltage, the reference value, and the AC voltage frequency.Type: GrantFiled: September 13, 2012Date of Patent: March 4, 2014Assignee: Fanuc CorporationInventors: Yasusuke Iwashita, Tadashi Okita, Masakazu Niwa
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Publication number: 20140021890Abstract: A comminuting machine includes a frame, a comminuting rotor coupled to the frame, and a rotary drive coupled to the rotor. The rotary drive including a controller, a multi-phase motor connected to the controller, a set of contactors disposed between the controller and the multi-phase motor for selectively providing driving motive force to the multi-phase motor, and at least one rheostat disposed between the controller and the multi-phase motor, in parallel with the first set of contactors, for selectively providing a stopping resistance to the multi-phase motor to effect frictionless braking of the comminuting rotor, wherein the controller is configured to operate the set of contactors and the at least one rheostat to single phase lines of the multi-phase motor for providing the stopping resistance.Type: ApplicationFiled: April 16, 2013Publication date: January 23, 2014Applicant: Harris Waste Management Group, Inc.Inventor: Javier Herrera
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Patent number: 8635000Abstract: A brake monitoring system for a machine has at least one traction motor coupled to drive wheels of the machine. An operator input device receives a requested retarding torque from an operator of the machine and sends a signal to a controller that is configured to compare the required retarding torque to a maximum retarding torque available at a particular speed of the traction motor. The controller selectively generates a warning signal based on a comparison of the required retarding torque to a maximum retarding torque available.Type: GrantFiled: November 14, 2012Date of Patent: January 21, 2014Assignee: Caterpillar Inc.Inventors: Matthew L. Hendrickson, Alexander C. Crosman, III, Bo Xie, Bradley S. Bailey
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Patent number: 8614555Abstract: An actuator control system includes a controller and a buck-boost circuit. The controller is configured to direct power from a power source to an actuator. The actuator is coupled to a control device to apply a force related to operation of a vehicle. The buck-boost circuit is configured to direct excess power generated by the actuator to an energy storage device when an actuator power level satisfies an anticipated power level.Type: GrantFiled: March 23, 2012Date of Patent: December 24, 2013Assignee: The Boeing CompanyInventors: James J. Sheahan, Jr., Thomas W. Omohundro, James L. Peck, Jr.
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Patent number: 8606478Abstract: A system and a method are provided for controlling a foundation brake of a vehicle having at least one foundation brake device, wherein the usability of the foundation brake is limited to a predetermined total application-time of the foundation brake within a predetermined time interval.Type: GrantFiled: December 12, 2007Date of Patent: December 10, 2013Assignee: Volvo Lastvagnar ABInventors: Jens Samsioe, Peter Lingman
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Patent number: 8604728Abstract: A system and method are provided for controlling a locomotive such that the braking effort is maintained at its optimal maximum level throughout the extended range. The method comprises detecting a first reduction in speed of the locomotive; energizing at least one solid state device connected across one or more grid resistors for a first predetermined amount of time to divert current away from the one or more grid resistors for the first predetermined amount of time; and de-energizing the solid state device after the first predetermined amount of time. The solid state device may be an Isolated Gate Bipolar Transistor (IGBT) and a plurality of solid state devices are energized, each solid state device being connected across a corresponding resistor grid.Type: GrantFiled: August 9, 2011Date of Patent: December 10, 2013Assignee: Trac Rail Inc.Inventors: Aldo Liberatore, Viktor Gvelesiani
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Patent number: 8581531Abstract: An electric power converting apparatus includes a switching circuit, a PWM controller, conducting PWM all phase shut-off and zero-vector outputting, a unit configured to detect or estimate current flowing through a motor, a unit configured to conduct a DC braking, and a current comparator configured to compare between a DC braking time maximum current setup value, and a current value obtained by the unit configured to detect or estimate current. The PWM all phase shut-off and zero-vector outputting are conducted, repetitively, by the PWM controller, if the current comparator determines that a current value, which is obtained by the unit configured to detect or estimate current, exceeds the DC braking time maximum current setup value, when conducting the DC braking to obtain a braking power by running current through the motor.Type: GrantFiled: January 16, 2013Date of Patent: November 12, 2013Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Yusaku Onuma, Yusuke Arao
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Patent number: 8581535Abstract: A drive unit has a control power supply, a power source (1) producing direct current to one or more inverters (2), an energy storage (C) arranged at the power source (1) output, and a discharge circuit (8,10) for discharging the energy stored in the energy storage (C) and including a power resistor (8). Switches (5, 6) are arranged between the power source (1) and energy storage (C) and in default position when there is no control power in the drive unit. The power source (1) is disconnected and the energy storage (C) discharged through the power resistor (8) when the switches (5, 6) are in default position.Type: GrantFiled: August 26, 2008Date of Patent: November 12, 2013Assignee: ABB Technology LtdInventor: Yang Gao
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Patent number: 8541963Abstract: The invention relates to an electrodynamic braking device and to a method for braking a universal motor having a field winding and an armature. The universal motor can be switched from a motor mode to a braking mode. In the motor mode, the armature and the field winding are supplied with an alternating current of a power grid. In the braking mode, the armature is short-circuited and the field winding continues to be supplied with an alternating current from the power grid. In a first phase of the braking mode, the field winding can be supplied with an alternating current having the frequency of the power grid. In a further phase of the braking mode, the field winding is supplied by the power grid with an alternating current having a frequency that is reduced with respect to the frequency of the power grid.Type: GrantFiled: March 2, 2010Date of Patent: September 24, 2013Assignee: Robert Bosch GmbHInventor: Hans Hermann Rottmerhusen
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Patent number: 8531140Abstract: The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss.Type: GrantFiled: January 23, 2013Date of Patent: September 10, 2013Assignee: Hitachi Industrial Equipment Systems Co., LtdInventors: Satoshi Ibori, Yoshihiro Uchino, Hiroshi Watanabe, Masahiro Hiraga
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Patent number: 8521350Abstract: A control device for a vehicle includes: a charge control portion that adjusts an upper limit of charging power to a battery to prevent a negative electrode potential of the battery from dropping to a lithium reference potential, based on a charge/discharge history of the battery; a braking control portion that detects a sharing ratio between hydraulic braking force by a braking device and regenerative braking force for desired braking force according to a brake pedal depression amount so that a motor generator generates a regenerative braking force within a range of the adjusted upper limit of charging power; and a setting portion that variably sets, according to the hydraulic response rate detected by the detection portion, a degree of limitation of the upper limit when restricting charging current to the battery by restricting the upper limit.Type: GrantFiled: March 1, 2012Date of Patent: August 27, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Keiichi Minamiura
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Publication number: 20130214707Abstract: In a method for predefining a generator-based braking power of an electric machine in a vehicle, a motor-based propulsion power is predefined as a function of the position of a first final control element, e.g., an accelerator pedal, and the generator-based braking power is predefined as a function of the position of the first final control element, the generator-based braking power assuming values which are unequal to zero, already at an actuated position of the first final control element.Type: ApplicationFiled: February 20, 2013Publication date: August 22, 2013Applicant: Robert Bosch GmbHInventors: Matthias SCHMIDT, Chrisoph BENZ
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Publication number: 20130207578Abstract: A method is provided. A command to correspond to a target speed of a motor is received. A rotational speed of the motor is measured, and a brake-to-off ratio for a braking interval is calculated based at least in part on the rotation speed, the target speed, a braking parameter. An off state for an inverter that is coupled to motor is induced during an off portion of the braking interval, and a brake signal is applied to the inverter during a braking portion of the braking interval.Type: ApplicationFiled: February 14, 2012Publication date: August 15, 2013Applicant: Texas Instruments IncorporatedInventors: Kazunori Itoh, Yasushi Kitamura
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Patent number: 8508170Abstract: A driving device for a hatch in a vehicle, with a housing tube connected to a base part or to a movable structural component part, a protective tube connected to the movable structural component part or to the base part, a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle by which the housing tube and the protective tube are movable axially relative to one another. A rotary drive drives the spindle drive in rotation includes at least one electric motor. The driving device has a safety circuit that causes a braking effect on the rotary drive when the rotary drive is deactivated and when extraneous forces are introduced into the driving device from the outside.Type: GrantFiled: September 2, 2010Date of Patent: August 13, 2013Assignee: Stabilus GmbHInventor: Marian Bochen
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Patent number: 8508165Abstract: A rectifier connected with an AC source through a reactor, a plurality of capacitors connected in series between output terminals of the rectifier, first switching means connected between one input terminal of the rectifier and a connection point of a plurality of capacitors, second switching means connected between the other input terminal of the rectifier and the connection point of a plurality of capacitors, and a plurality of diodes connected with the plurality of capacitors in inverse-parallel are provided.Type: GrantFiled: August 1, 2008Date of Patent: August 13, 2013Assignee: Mitsubishi Electric CorporationInventors: Yosuke Shinomoto, Hideki Takahara, Masato Handa, Makoto Tanikawa, Mitsuo Kashima
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Patent number: 8487560Abstract: An electric brake system for an electromechanical machine connected to output terminals of an inverter, input terminals of which are supplied by a DC voltage source. The system includes an electrical circuit connected between the input terminals of the inverter and including, connected in series: a mechanism dissipating electrical energy returned by the electromechanical machine to the input terminals of the inverter during a braking phase of the electromechanical machine, including an inductor wound around a magnetic circuit; and a switching mechanism to close the electrical circuit during a braking phase of the electromechanical machine and to open the electrical circuit in absence of a braking phase of the electromechanical machine.Type: GrantFiled: November 12, 2009Date of Patent: July 16, 2013Assignee: Hispano SuizaInventor: Eric De Wergifosse
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Patent number: 8487559Abstract: A diesel-electric drive system includes a generator having two multi-phase winding systems, a diesel engine, and a DC-link converter. Two self-commuted pulse power converters on the generator side are linked to the windings systems and to each other by a brake resistor on the alternating voltage side. The brake resistor is split into two series-connected resistors, each having half the resistance value of the brake resistor. An input of a bipolar switching device is connected to a connecting point of two series-connected resistors. The capacity of the diesel motor can then be checked in a self-load test with a controllable load torque of the diesel-electric drive system, while eliminating overloads of the power semiconductors of the self-commuted pulse power converters on the generator side.Type: GrantFiled: March 27, 2009Date of Patent: July 16, 2013Assignee: Siemens AktiengesellschaftInventors: Andreas Holweck, Olaf Körner
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Patent number: 8482245Abstract: A power conversion device in which an inverter for controlling a load is connected to an alternating current power system, and arranged to perform an electric power assist by connecting a direct-current power assist device having a chopper and a charge device to a direct-current circuit of the inverter. The device including a setting section to set charge and discharge target values in accordance with a sensed value of the direct-current voltage of the inverter; a charge control section to perform a charge control based on the charge target value; a discharge control section to perform a discharge control based on the discharge target value; and an instantaneous-low high-speed-compensation section to estimate an electric power corresponding to a direct-current sensed voltage of the inverter, and to output a value to the discharge control section which is obtained by dividing the estimated value by the direct-current sensed voltage.Type: GrantFiled: March 19, 2009Date of Patent: July 9, 2013Assignee: Meidensha CorporationInventors: Takeshi Kondo, Katsutoshi Miyazaki
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Patent number: 8466641Abstract: The invention relates to a method for decelerating a drive movement of a power tool and to a power tool suitable for carrying out the method, having a drive driven by a motor, an energy supply device for the provision of electrical energy, a controller having a motor controller for activating the motor and an operating-state recognition module which is to detect at least one operating-state variable and, as a function of this, to output a brake signal, the controller being designed to initiate, as a function of the brake signal, a braking procedure in which brake cycles are provided which have a first time segment, in which the motor is short-circuited, and a second time segment in which current is fed to the motor opposite to its original direction of rotation.Type: GrantFiled: July 20, 2011Date of Patent: June 18, 2013Assignee: C. & E. Fein GmbHInventors: Michael Kaufmann, Ulf Rinckleb
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Publication number: 20130127380Abstract: An electric power converting apparatus includes a switching circuit, a PWM controller, conducting PWM all phase shut-off and zero-vector outputting, a unit configured to detect or estimate current flowing through a motor, a unit configured to conduct a DC braking, and a current comparator configured to compare between a DC braking time maximum current setup value, and a current value obtained by the unit configured to detect or estimate current. The PWM all phase shut-off and zero-vector outputting are conducted, repetitively, by the PWM controller, if the current comparator determines that a current value, which is obtained by the unit configured to detect or estimate current, exceeds the DC braking time maximum current setup value, when conducting the DC braking to obtain a braking power by running current through the motor.Type: ApplicationFiled: January 16, 2013Publication date: May 23, 2013Inventors: Yusaku Onuma, Yusuke Arao
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Publication number: 20130119899Abstract: A process for electrical assistance to the braking of a vehicle with a motor system (M), whereby the motor system (M) includes at least one electric motor (10) whose output shaft (14) is coupled to a primary shaft (20) that drives at least one wheel (22) of the vehicle, at least one wheel (22) of the vehicle being equipped with a mechanical braking device that is activated by a hydraulic circuit, whereby the process is characterized in that it includes: collecting information in the hydraulic circuit of the primary braking circuit, and using the information as a set-point for a braking torque generated by the electric motor (10) and exerted on the primary drive shaft (20) of the wheels.Type: ApplicationFiled: November 14, 2011Publication date: May 16, 2013Inventors: Thierry ZERBATO, Pascal DUCLOS
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Patent number: 8441218Abstract: This invention relates to an electrical regenerative brake (100) with a rotating brake coil (10) which is mounted on a wheel (14) of a vehicle, whereby a magnetic field (18) is fed in the coil (10). In order to allow effective regenerative braking (100) at low speeds and to provide a significant increase in power saving, this invention proposes that the permanent magnet (13) producing the magnetic field (18) is placed in the inner space of at least one additional coil (11, 12), whereby the brake has an electric circuit (22) which contains the rotating brake coil (10) and the additional coil (11, 12) as elements.Type: GrantFiled: October 31, 2008Date of Patent: May 14, 2013Assignee: NXP B.V.Inventor: Anirban Lahiri