Control Of Motor Load Or Device Driven Patents (Class 318/433)
  • Patent number: 10585417
    Abstract: A machine learning device for learning a threshold value of detecting an abnormal load in a machine tool, includes a state observation unit, and a learning unit. The state observation unit observes a state variable obtained based on at least one of information about a tool, main spindle revolution rate, and amount of coolant of the machine tool, material of a workpiece, and moving direction, cutting speed, and cut depth of the tool, and the learning unit learns the threshold value of detecting an abnormal load based on training data created from an output of the state observation unit and data related to detection of an abnormal load in the machine tool and on teacher data.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: March 10, 2020
    Inventors: Kanta Takayama, Kazuo Sato, Hideaki Maeda
  • Patent number: 10286785
    Abstract: A method of regenerative braking includes providing an electric motor including at least one stator and a rotor, a speed of the rotor, a motor controller that regulates a current level in the stator winding, a power inverter which controls an energy flow to the stator terminal, and an energy storage system (ESS) which exchanges energy with the motor. A battery management circuit is between the power inverter and the ESS, and a processor has an associated memory storing a regenerative braking (RB) algorithm. The RB algorithm during braking causes the motor controller to execute determining an RB torque value from the rotor speed that maximizes regenerative braking current, and the power inverter is used to redirect the RB current to maximize a power transfer from the motor to the ESS.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: May 14, 2019
    Inventors: Aravind Samba Murthy, David Patrick Magee
  • Patent number: 10261495
    Abstract: Provided is a control method for a machining tool that processes a workpiece while causing a tool, which rotates by means of a main shaft motor, and the workpiece, which is secured to a table, to move relative to one another, wherein on the basis of the torque command value, the current command value, or the actual current value of the main shaft motor, calculated is the actual cutting force of the tool that is received from the workpiece at a location which is predetermined during the processing of the workpiece, and the actual cutting force that has been calculated is displayed on a display unit.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: April 16, 2019
    Inventors: Kazunari Ishii, Takehito Shinada
  • Patent number: 10222784
    Abstract: A method for controlling a device system is disclosed, and the device system includes a tool device and a motorized advancing apparatus during the machining of a workpiece composed of a first material and a second material different from the first material. The method includes machining the workpiece by the device system initially in a first operating mode with first machining parameters that are stored for the first material. After the start of the machining of the workpiece in the first operating mode, the method includes measuring and storing a first machining progress of the tool device as a reference value. During the machining of the workpiece in the first operating mode, the method also includes regularly measuring and comparing with a first threshold value a current machining progress of the tool device.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: March 5, 2019
    Assignee: Hilti Aktiengesellschaft
    Inventors: Tobias Drexl, Ralf Pfeiffer, Roland Schaer, Dieter Profunser
  • Patent number: 10092989
    Abstract: To provide a tool transfer apparatus including gripping force measuring unit for tool holding unit of a tool accommodation apparatus and a machining system including the tool transfer apparatus, a handling robot can perform operation of detaching a tool from a grip positioned at a tool attachment/detachment position of a tool magazine in a machine tool and transferring the tool to a tool stocker, and operation of transferring a tool from the tool stocker and attaching the tool to a grip positioned at the tool attachment/detachment position of the tool magazine. A hand portion of the handling robot is provided with a force sensor, which can detect a load applied to the hand portion. Also, a control apparatus of the handling robot and a control apparatus of the machine tool are connected via a data cable capable of transmission and reception of information.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: October 9, 2018
    Inventor: Gaku Isobe
  • Patent number: 9983240
    Abstract: A circuit configured to sense the driving current of a motor, the circuit comprising: a driver configured to generate a driving current for a motor; a first current sensor configured to sense the driving current thereby forming a first sensed current; a second current sensor configured to sense the driving current thereby forming a second sensed current, the second current sensor being more thermally stable than the first current sensor; a comparator configured to compare the first sensed current and the second sensed current below a threshold frequency to generate a thermal calibration output; and a calibrator configured to calibrate the first sensed current by the thermal calibration output to form a sensed driving current.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: May 29, 2018
    Inventors: Paul Christopher Roberts, Luke David Ronald Hares
  • Patent number: 9701337
    Abstract: A control computing unit allocates the current axial force and the transverse-G axial force at the predetermined allocation ratio to calculate a feedback axial force which is the steering-rack axial force. Then, the control computing unit drives the reaction force motor on the basis of the calculated feedback axial force. Additionally, the allocation ratio of the transverse-G axial force is set to be greater than the allocation ratio of the current axial force.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: July 11, 2017
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yu wun Chai, Takaaki Eguchi, Yukinobu Matsushita, Kazuhiro Igarashi
  • Patent number: 9518560
    Abstract: A method to individually optimize respective pitch angles of blades in a wind turbine. The method allows supplying (102) a modulation signal to modulate a pitch angle of the individual blade being optimized. The method further allows filtering (104) output power of the turbine subject to the modulating frequency to extract a power signal in a frequency spectrum including the modulating frequency. The extracted power signal and a demodulation signal are mixed (106) to generate a signal including a product of the extracted power signal and the demodulation signal. The generated signal is filtered (108) to remove the modulating frequency and extract a gradient signal effective to search a pitch angle estimate conducive to optimize output power of the turbine. The gradient signal may be integrated (110) to cause the gradient signal to converge towards an optimal pitch angle for the individual blade being optimized.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: December 13, 2016
    Inventor: Justin Creaby
  • Patent number: 9306481
    Abstract: A variable speed fan motor, including a variable speed motor body and a motor controller. The motor controller includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply. The gear detection circuit includes a plurality of current sensing units. Only one of the power input lines is in an energized state, and remaining power input lines are in a deenergized state. Each power input line is connected to one current sensing unit. An output end of the current sensing unit is connected to an input end of the microprocessor. The microprocessor selects operating parameters of the motor according to a detected signal of energization state of each power input line. The microprocessor is connected to the series communication unit. The microprocessor communicates with an external device via the series communication unit.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: April 5, 2016
    Inventors: Yong Zhao, Yunsheng Chen
  • Patent number: 9248744
    Abstract: A control apparatus is provided for controlling a multi-phase, switched reluctance motor. The control apparatus includes voltage adjusters, a controller, and a carrier signal generator. Each of the voltage adjusters adjusts a voltage applied to a corresponding one of voltage application targets on the same salient pole of a stator of the motor. The controller controls each of the voltage adjusters via a pulse-width modulation based on comparison between a command signal and a corresponding one of carrier signals, thereby controlling the voltage applied to the corresponding voltage application target to a command voltage indicated by the command signal. The carrier signal generator generates the carrier signals so that for at least one pair of the voltage application targets on the same salient pole of the stator, two of the carrier signals which respectively correspond to the pair of the voltage application targets are offset in phase from each other.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: February 2, 2016
    Inventor: Yoshinobu Kamada
  • Patent number: 9007007
    Abstract: A handheld machine tool has a drive motor and a supplementary handle which is mounted on the housing of the handheld machine tool and is assigned a drive-torque limitation device, the drive-torque limitation device limiting the drive torque to a torque level below a maximum torque if the supplementary handle is not mounted on the housing.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: April 14, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Thilo Koeder
  • Patent number: 8994304
    Abstract: Disclosed is a method for controlling a permanent magnet synchronous motor to maximize use of voltages of a battery by voltage phase control within weak magnetic flux area and to achieve compensation for a torque error through a torque compensator when driving the permanent magnet synchronous motor for hybrid vehicles. In particular, the method controls a permanent magnet synchronous motor so that voltage use can be maximized in a weak magnetic flux area by using voltage near maximum voltage through voltage phase control utilizing magnetic flux-based map data receiving a torque command and motor speed/batter output voltage as inputs and torque error can be compensated using a torque compensation filter when a motor constant is changed in the weak magnetic flux by a circumstance parameter, when the permanent magnet synchronous motor mounted in a hybrid vehicle and an electric vehicle is driven.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: March 31, 2015
    Assignees: Hyundai Motor Company, Kia Motors Corporation, Industry-Academic Cooperation Foundation, Yeungnam University
    Inventors: Su Hyun Bae, Sung Kyu Kim, Won Kyoung Choi, Mu Shin Kwak, Jul Ki Seok, Se Hwan Kim
  • Patent number: 8988836
    Abstract: When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and fusion. A power circuit 1 of the air conditioner includes a rectifier circuit RC, a capacitor C (smoothing unit), a main relay 10 provided on a current path between the rectifier circuit RC and the capacitor C, an inverter circuit 30, a microcomputer 100, and a delay circuit 40. The microcomputer 100 has an inverter circuit control unit 110, a main relay opening/closing control unit 120, a waveform forced cut-off unit 130, and a cut-off signal output unit 140.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: March 24, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Hirotaka Saruwatari, Yuuko Nakashita, Nobuyasu Hiraoka, Satoshi Yagi, Hirotaka Doi, Keisuke Shimatani
  • Patent number: 8972115
    Abstract: A motor driven power steering (MDPS) may include: a vehicle speed sensor configured to sense vehicle speed; a temperature sensor configured to sense a temperature of a power pack; a current sensor configured to sense an amount of current applied to the MDPS; a storage unit configured to store a thermal resistance value based on the vehicle speed with respect to the temperature of the power pack; and a control unit configured to calculate an estimated temperature by reflecting the thermal resistance value based on the vehicle speed with respect to the temperature of the power pack and the current amount applied to the MDPS into a temperature estimation function, and drive a motor according to the calculated estimated temperature.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: March 3, 2015
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Se Wook Oh
  • Patent number: 8823305
    Abstract: In an electric power steering system, a back electromotive force constant is calculated on the basis of a steering angular velocity and an estimated induced voltage. Then, a rotation angular velocity of a motor is calculated as an estimated rotation angular velocity on the basis of a motor current, a motor voltage, the back electromotive force constant and a motor resistance.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: September 2, 2014
    Assignee: JTEKT Corporation
    Inventors: Kozo Niimi, Yuji Kariatsumari
  • Patent number: 8729847
    Abstract: Embodiments of the present disclosure relate to methods, systems and apparatus for mapping torque to current to generate current commands used to control operation of an electric machine. Based on a DC input voltage, lookup tables (LUTs) are selected. Each of the selected LUTs includes a plurality (B) of first entries that correspond a particular input value of an angular rotation speed of the electric machine, and a set of coefficients are output from each of the selected LUTs that can be applied within a first polynomial function to generate a plurality of first polynomial functions each having a different sets of coefficients. A plurality of particular output values for a first current command are generated via the plurality of first polynomial functions. The particular output values for the first current command can be interpolated to generate a final output value for the first current command.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: May 20, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Gabriel Gallegos-Lopez, Michael H. Kinoshita, Milun Perisic
  • Patent number: 8688326
    Abstract: A method for supporting a driver when steering a vehicle, in which a servo torque, as well as an additional actuating torque that may additionally be exerted on the steering system of the vehicle, are produced in order to cause the driver to make a change in the position of the steering wheel. The steering intervention by the additional required actuating torque may be made significantly more comfortable if the gradient of the actuating torque is limited to a maximum value.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: April 1, 2014
    Assignee: Robert Bosch GmbH
    Inventor: David Rubia
  • Patent number: 8676417
    Abstract: A method for managing a threshold increase in output torque capability in a vehicle includes detecting the threshold increase in output torque capability using a controller, and automatically limiting, via the controller, a rate of change of an actual output torque from a transmission of the vehicle in response to the threshold increase. The actual output torque is provided via a traction motor solely using battery power from an energy storage system. The method may include calculating a difference between the threshold increase and the actual output torque, and limiting the rate of change using a rate that is proportional to the difference. A vehicle includes the ESS, a transmission, and a controller. An output member of the transmission is powered using electrical energy from the ESS. The controller manages an increase in output torque capability as noted above.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: March 18, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Michael Arnett, Alexander K. Rustoni, Sean W. McGrogan, Goro Tamai
  • Patent number: 8564234
    Abstract: A power device includes a switching device and a control unit. The switching device has a control terminal and an output terminal. The control unit is configured to control a rising time required for a driving voltage for controlling the switching device to reach a target level such that a voltage between the control terminal and the output terminal is maintained less than or equal to a critical voltage. When the voltage between the control terminal and the output terminal is greater than the critical voltage, leakage current is generated between the control terminal and the output terminal.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: October 22, 2013
    Assignee: Samsung Electronics, Co., Ltd.
    Inventor: Ho-jung Kim
  • Patent number: 8560183
    Abstract: Systems, methods, devices, and computer readable media for controlling a digging operation of an industrial machine. A method includes determining a hoist bail pull associated with the industrial machine, determining a crowd torque limit value for a crowd drive based on the determined hoist bail pull of the industrial machine, and setting a crowd torque limit of the crowd drive to the crowd torque limit value to limit a torque associated with a crowd motor to the crowd torque limit value.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: October 15, 2013
    Assignee: Harnischfeger Technologies, Inc.
    Inventors: Joseph Colwell, William Hren, Mark Emerson, Michael Linstroth
  • Patent number: 8554411
    Abstract: In an electric power steering system, an ECU 11 includes two independent microcomputers 17a, 17b that serve as motor control signal generators, and the microcomputers 17a, 17b perform the same current feedback computation. Switching arms 20a, 20b that constitute a driving circuit 18 operate independently of each other, based on motor control signals generated by the corresponding microcomputers 17a, 17b. Each of the microcomputers 17a, 17b determines whether an absolute value of a current deviation of an actual current I (I1, I2) from a current command value exceeds a predetermined threshold value. If the current deviation exceeds the threshold value, it is determined that an abnormality occurs in the system.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: October 8, 2013
    Assignee: Jtekt Corporation
    Inventor: Noritake Ura
  • Patent number: 8515637
    Abstract: A machine control system may include an input receiving portion configured to receive torque inputs related to a hydrostatic transmission. The input receiving portion may also receive an operator request for actuating the hydrostatic transmission. The machine control system may also include a processor configured to determine a factor based at least in part on the torque inputs, for adjusting the operator request. The processor may also be configured to determine a command for actuating the hydrostatic transmission based on the adjusted operator request, such that a torque load to be exerted on a power source by the hydrostatic transmission is within a desired range. The machine control system may further include an output sending portion configured to send the command to the hydrostatic transmission.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: August 20, 2013
    Assignee: Caterpillar Inc.
    Inventors: Randall T. Anderson, Corwin E. Storer
  • Patent number: 8450960
    Abstract: An electronic control module for a machine may include instructions for performing a method. The method may include obtaining a total torque load limit for one or more hydrostatic transmission loops in the machine. The method may also include allocating the total torque load limit between the one or more hydrostatic transmission loops in the form of one or more lower level torque load limits.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: May 28, 2013
    Assignee: Caterpillar Inc.
    Inventor: Randall T. Anderson
  • Patent number: 8415909
    Abstract: A motor control system for controlling two or more motor groups includes a power converter that receives power from a power source and converts the power to an intermediate power and an intermediate power link coupled to the power converter. The motor control system also includes at least one motor driver coupled to the intermediate power link configured to provide power to one or more motors and a controller coupled to the power converter and the at least one motor driver. The controller is configured to cause the at least one motor driver to limit the amount of power delivered to the one or more motors based on the amount of power that the power converter can produce.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: April 9, 2013
    Assignee: General Electric Company
    Inventors: Shyam Sunder Ramamurthy, Timothy Ray Jackson, Richard Francis Whalen, Jr.
  • Patent number: 8378607
    Abstract: A method and arrangement are provided for operating a ship ramp driven by an electric motor between an upper end position and a lower end position. The arrangement includes means for reducing the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp, and means for determining the position of the ramp on the basis of at least one of the number of rotations performed by the at least one electric motor, a quantity indicative of the number of rotations, and an elapsed time in accordance with the velocity of the ramp. The arrangement also includes means for allowing the reduction of the maximum torque of the at least one electric motor only when the determined position of the ramp is within a zone defined by predetermined limits.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: February 19, 2013
    Assignee: ABB Oy
    Inventor: Mikael Holmberg
  • Patent number: 8303449
    Abstract: A transmission assembly is powered by an electric motor and includes a transmission having an outer ring gear, a connector moveable relative to the outer ring gear between a first position, in which the connector is rotatable with the transmission in response to torque received from the motor, and a second position, in which the connector and the outer ring gear are non-rotatable, and a control mechanism operable to detect the operating current of the motor and compare the operating current to a threshold current. The control mechanism is operable to move the connector from the first position to the second position in response to the motor operating current exceeding the threshold current.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: November 6, 2012
    Assignee: Techtronic Power Tools Technology Limited
    Inventors: Chi Hong Ho, Ka Ki Chan, Wing Fung Yip
  • Patent number: 8264190
    Abstract: A control apparatus for a multi-phase rotary machine includes a control unit and a plurality of power supply systems including respective inverter units. When a short-circuiting failure occurs in one of the systems due to an ON-failure in any one of FETs in an inverter unit of the failure system, the control unit stops driving of the rotary machine by bringing all the FETs in the failure system into the OFF state. The control unit controls FETs of the non-failure system such that a brake torque generated in the failure system is cancelled or the influence of the brake torque exerted on the driving of the motor is reduced.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: September 11, 2012
    Assignee: Denso Corporation
    Inventor: Takashi Suzuki
  • Patent number: 8240425
    Abstract: When a source consisting of series-connected battery 7 and auxiliary power supply 9 supplies an electric power to a motor 4, a MOS-FET 13 for preventing a current induced by a voltage of the auxiliary power supply 9 from being reversed upstream should be off if it operates normally. Therefore, voltages at the opposite terminals of the MOS-FET 13 should have a difference which corresponds to a voltage of the auxiliary power supply 9. Hence, the voltages at the opposite terminals of the MOS-FET 13 are detected by two voltage detectors 23 and 25 when the electric power from the auxiliary power supply 9 is supplied to the motor 4. If the potential difference between the voltages at the opposite terminals of the MOS-FET 13 is equal to or less than a predetermined value, a control circuit 24 issues a failure signal upon determination that the MOS-FET 13 suffers a short-circuit fault. A MOS-FET 15 is also monitored in the same way.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: August 14, 2012
    Assignee: Jtekt Corporation
    Inventor: Shigeki Nagase
  • Patent number: 8228647
    Abstract: An electrical power diagnostic system includes a system housing, a power saw management system, and a user interface. The system housing is electrically connected with the power unit of the power saw, wherein the system housing includes a control panel provided thereon for allowing a user to adjust an operational parameter through the control panel. The power saw management system includes a control processor mounted within the system housing to electrically communicate with the power saw, wherein the control processor is pre-programmed to manage operational parameters of the power saw and supervise actual operation of the power saw machine and the saw blade in such a manner that when abnormal operating condition of the power saw machine is detected, the control processor is adapted to selectively adjust the operational parameters of the power saw machine for stopping the abnormal operating condition from continuously happening.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: July 24, 2012
    Inventor: Wy Peron Lee
  • Patent number: 8222784
    Abstract: An electric machine provided with: a stator, equipped with a single stator winding; at least two shafts, which are independent of one another and are mounted so that they can turn; at least two rotors, which are independent of one another, are magnetically coupled to the stator, and are mounted on the shafts; and a single electronic power converter, which is connected to the stator winding for supplying the stator winding itself with a total electric current.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: July 17, 2012
    Assignee: Magneti Marelli S.p.A.
    Inventors: Giovanni Serra, Angelo Tani, Luca Zarri, Marco Raimondi, Marco Greco, Paolo Cominetti
  • Patent number: 8200386
    Abstract: A method of controlling an accelerator of a four-wheel drive electric vehicle comprises the steps of controlling power output of the vehicle by a sum of an output torque of a main drive motor and an output torque an auxiliary drive motor with the output torque of the main drive motor being determined by a position of the accelerator pedal. The output torque T0 of the auxiliary drive motor is determined by: obtaining a torque calculation factor GainAccSum that a cumulative value of the acceleration GainAcc of the accelerator pedal; determining a maximum output torque T of the auxiliary drive motor at a current speed of the vehicle; and calculating the output torque T0 of the auxiliary drive motor varying between 0 and T based on the torque calculation factor GainAccSum and the maximum output torque T of the auxiliary drive motor at the current speed of the vehicle.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: June 12, 2012
    Assignee: BYD Company Limited
    Inventors: Xianhong Jiang, Xuguang Zhou, Xiaohua Tang
  • Patent number: 8171776
    Abstract: A torque measuring device for determining properties such as viscosity, shearing force or concentration in liquids or suspensions. The device comprises two elastically connected concentric axles in the form of one external hollow axle through which an inner measuring axle extends, and an element responsive to the measured medium located on a distal end of the measuring axle. The axles are individually propelled by electrical motors. The motors are operated such that the axles rotate at generally constant speed and, simultaneously, the phase between the two are controlled irrespective of applied speed and torque. The torque is measured through the degree of load of the motor propelling the inner axle, which is provided as an output signal.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: May 8, 2012
    Assignee: BTG Pulp & Paper Sensors AB
    Inventors: Niclas Andersson, Joakim Kullander, Peter Lundberg, Peter Adrian
  • Patent number: 8174225
    Abstract: The maximum electrical power drawn from an electrical power source by a mining excavator comprising electric motors is reduced by supplying supplementary electrical power from an electrical energy storage unit. The input electrical power drawn by the mining excavator is cyclic. An upper limit is set for the electrical power drawn from the electrical power source. When the input electrical power drawn by the mining excavator exceeds the upper limit, electrical power is supplied by the electrical energy storage unit, such as an ultracapacitor bank. The ultracapacitor bank may be charged by the electrical power source during off-peak intervals. Electrical power generated by electrical motors operating in a regeneration interval may also be recaptured and stored in the electrical energy storage unit.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: May 8, 2012
    Assignee: Siemens Industry, Inc.
    Inventors: Joy Mazumdar, Walter K├Âllner, Andreas Holweck, Michael G. Onsager, Ekkehard Pittius
  • Patent number: 8129935
    Abstract: A motor control device includes: a motor-current detection unit; a rotational-angular-speed calculation unit for calculating a rotational angular speed of a motor; a rotational-angle-change-amount calculation unit for multiplying the rotational angular speed by a predetermined time so as to calculate a motor-rotational-angle change amount within a predetermined time; a basic-drive-value calculation unit for calculating a basic drive value for driving the motor; a correction-value calculation unit for calculating a correction value for correcting the basic drive value based on the motor current and the motor-rotational-angle change amount; a correction unit for evaluating the motor drive value by correcting the basic drive value by the correction value; and a drive unit for driving the motor by using the motor drive value evaluated by the correction unit.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: March 6, 2012
    Assignee: JTEKT Corporation
    Inventor: Yuji Kariatsumari
  • Patent number: 8089230
    Abstract: In a method for limiting the excess force of a closing part of an adjusting device, the closing part is actuated by external force. An anti-jamming system determines, during an adjusting operation, current adjusting force values at least within a partial area of the adjusting path and respectively, in predetermined positions of the closing part, and compares the values to adjusting force comparative values which are already stored in a storage device. At least one of the stored adjusting force comparative values are adapted to mechanical technical conditions of the adjusting device and the extent of the adaptation is predetermined according to the service life.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: January 3, 2012
    Assignee: Continental Automotive GmbH
    Inventors: Gerhard Fuchs, Stefan Holzmann, Roman Morawek
  • Patent number: 8058829
    Abstract: An electronic control module for a machine may include instructions for performing a method. The method may include obtaining a total torque load limit for one or more hydrostatic transmission loops in the machine. The method may also include allocating the total torque load limit between the one or more hydrostatic transmission loops in the form of one or more lower level torque load limits.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: November 15, 2011
    Assignee: Caterpillar Inc.
    Inventor: Randall T. Anderson
  • Publication number: 20110260666
    Abstract: A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor.
    Type: Application
    Filed: July 6, 2011
    Publication date: October 27, 2011
    Inventor: Arthur E. Woodward
  • Patent number: 8019508
    Abstract: In a motor-driven power steering apparatus, there is provided a correction coefficient memory previously storing an output correction coefficient to be multiplied by a current control signal applied to an electric motor at certain points in a range of temperatures in such a manner as to correct a temperature dependent output torque changing in dependence upon an environmental temperature of the electric motor to a demand output torque required in the electric motor.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: September 13, 2011
    Assignee: Showa Corporation
    Inventors: Yoshinori Takeuchi, Yoshitaka Kubo, Shunya Senda
  • Patent number: 8018191
    Abstract: A main power supply and an auxiliary power supply for supplying power to a motor are provided. A MOS-FET for supplying power from the main power supply and a MOS-FET for supplying power from the main and auxiliary power supplies are provided. When a phenomenon in which a rotor of a motor is rotated by the going-back force of steered wheels occurs, and voltage VG of power generated by the motor satisfies the relation VG>VB+VC where VB is a voltage of the main power supply and VC is a voltage of the auxiliary power supply, a control circuit and a gate drive circuit turn off both MOS-FETs so as to charge the auxiliary power supply using the voltage VG through a parasitic diode of the MOS-FET.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: September 13, 2011
    Assignee: JTEKT Corporation
    Inventor: Shigeki Nagase
  • Patent number: 8013556
    Abstract: A current instruction generation unit generates a d-axis current instruction and a q-axis current instruction based on a torque instruction for an AC motor, using a map in which a current instruction capable of lowering noise (vibration and sound noise) (low-noise current instruction) generated from the AC motor is determined in advance for each torque of the AC motor. Then, a signal for driving an inverter is generated based on the generated d-axis current instruction and the q-axis current instruction.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: September 6, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroyuki Hattori, Kenji Yamada, Ryoji Sato
  • Patent number: 8013555
    Abstract: A drive system for operation of a tap changer for voltage regulation of a transformer on load. An electric motor is connectible to a movable part of the tap changer for moving the movable part for carrying out a tap change operation. An electric converter connects an electric power supply to the electric motor. A control arrangement is adapted to control the electric converter for controlling the operation of the motor and by that of the tap changer.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: September 6, 2011
    Assignee: ABB Research Ltd.
    Inventor: Christer Thornell-Pers
  • Patent number: 7990093
    Abstract: A control apparatus for a multiphase AC electric motor having an inverter includes a current control including an abnormal-state current controller; an abnormal-state detector that detects an abnormal state of any of a wire of an electric motor, a wire of an inverter, and a wire connecting the electric motor to the inverter as an abnormal phase; and an abnormal phase disconnect. The abnormal phase disconnect disconnects one or more of phases detected to be in an abnormal-state and the abnormal-state current controller generates an abnormal state voltage command in accordance with detection of an abnormal state, and uses phases other than the disconnected phases of the inverter to control individual currents of the phases, with the abnormal-state voltage command used as a multiphase voltage command.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: August 2, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Isao Kezobo, Masahiro Kimata, Takayuki Kifuku, Kazumichi Tsutsumi, Chiaki Fujimoto, Noriyuki Inoue
  • Patent number: 7960931
    Abstract: A digital controller for controlling variable speed and dynamic torque applications of an electric motor. The controller includes a state observer monitoring a torque load requirement and sending a signal based on the torque load requirement, and a digital control unit for receiving the signal from the state observer and sending an output to the electric motor. The output is a value that corresponds to a first motor operating state or a second motor operating state.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: June 14, 2011
    Assignee: Illinois Institute of Technology
    Inventors: Fernando Rodriguez, Srdjan M. Lukic, Ali Emadi
  • Patent number: 7932687
    Abstract: An actuator system, preferably for patient lifters, includes at least one actuator driven by an electric motor, a control unit having a power limiting circuit, and at least one handset having a plurality of keys. The actuator system is arranged such that the threshold value of the maximum permissible power in the power limiting circuit may be changed, and that this change may be performed via a key on the handset. Thus, it is possible to subsequently adjust the cutout limit safely and easily via a key on a handset, so that the cutout limit may be adapted to the actual application into which the actuator system is to be incorporated. For reasons of safety, it is preferred to use a separate handset for changing the threshold value.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: April 26, 2011
    Assignee: Linak A/S
    Inventor: Jeppe Christian Bastholm
  • Patent number: 7791298
    Abstract: A motor driver system includes an inverter configured to apply a three-phase voltage to a motor; an inverter driver configured to generate a reference voltage to the inverter to control a motor speed to follow a reference speed; and a motor protector configured to control the inverter driver so that a value of the reference voltage is equal to or lower than a predetermined voltage value.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: September 7, 2010
    Assignee: LG Electronics Inc.
    Inventors: Kyung Hoon Lee, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
  • Patent number: 7769520
    Abstract: A method of controlling tractive force of a vehicle comprising determining a tractive force request of a driver of the vehicle, determining an actual tractive force of the vehicle, and modifying the actual tractive force of the vehicle to be equal to the tractive force request.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: August 3, 2010
    Assignee: Ford Global Technologies, LLC
    Inventors: Jan Ryderstam, Soren Eriksson
  • Patent number: 7723934
    Abstract: The invention relates to a method for controlling an automatic device for cleaning a surface immersed in liquid which comprises electric motors for driving a chassis along a cleanable surface. The inventive method consists in periodically measuring at least one electrical quantity which makes it possible to obtain the representative value of the resisting torque of at least one driving electric motor (7), in comparing each obtained value with the predetermined threshold representative value of a maximum acceptable value and, when said value is greater than said threshold value for the driving electric motor (7), a procedure known as a protection procedure is started.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: May 25, 2010
    Assignee: Zodiac Pool Care Europe S.A.S.U.
    Inventors: Pascal Adam, Phillippe Pichon
  • Patent number: 7719218
    Abstract: A motor control apparatus for computing or outputting motor load information, comprises: a storage unit which stores a function or table obtained in advance based on parameters used for the computation of the load information and on an actually measured value of a motor output or motor torque; and a load meter computing unit which computes the load information from the function or table stored in the storage unit by using the parameters used for the computation of the load information. With the above configuration, the load meter is computed in such a manner as to accurately indicate the load condition of a motor in real time over the entire speed range of the motor including the nonlinear control region of the motor, and the motor is controlled using the thus computed value or the computed value is displayed on a display unit.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: May 18, 2010
    Assignee: Fanuc Ltd
    Inventors: Yasusuke Iwashita, Takahiro Akiyama, Masakazu Niwa, Geng Li
  • Patent number: 7715964
    Abstract: A method of operating a vehicle at a substantially low speed based on change in the vehicle position. The method comprises the following steps: (A) transforming a steering control algorithm into a substantially low speed (SLS) steering control algorithm, wherein the (SLS) steering control algorithm is configured to operate the vehicle in an asynchronous low speed mode; and (B) implementing the SLS steering control algorithm as a controller configured to operate the vehicle in the asynchronous low speed mode.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: May 11, 2010
    Assignee: Trimble Navigation, Ltd.
    Inventor: John Arnold Connally
  • Patent number: 7696709
    Abstract: There is provided a controller for an electric power steering apparatus having a motor which applies a steering assist force to a steering mechanism. The controller includes a torque command value calculating portion which calculates a torque command value based on steering torque generated in a steering shaft, and a vehicle speed and a current command value calculating portion which calculates a current command value for the motor based on the torque command value. The controller controls the motor based on the current command value. In the apparatus, the controller has a cogging torque compensation value calculating portion which calculates a cogging torque compensation value for the motor, and corrects the current command value based on the cogging torque compensation value.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: April 13, 2010
    Assignee: NSK Ltd.
    Inventors: Shuji Endo, Hideyuki Kobayashi