Braking Patents (Class 318/362)
  • Publication number: 20040178754
    Abstract: A hill hold apparatus and operating strategy for an electric or hybrid electric vehicle is disclosed. The apparatus includes a three-phase machine that is coupled to drive wheels. The machine is powered by a pulse width modulated inverter having at least a first half-bridge coupled to a first machine phase, a second half-bridge coupled to a second machine phase, and a third half-bridge coupled to a third machine phase. The operating strategy employs predetermined switching modes to minimize and distribute the power loss among the power switches in the inverter and the machine phases.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 16, 2004
    Inventors: Mohammad Nazmul Anwar, Mehrdad Teimor
  • Patent number: 6788014
    Abstract: A drive control system for a multiphase motor powered by a power converter of a type including a multi-pulsed bridge circuit with a plurality of controllable converter valves and a same number of electrically isolating devices, includes a control unit, with the input side of the converter valves connected to the output side of the control unit via the electrically isolating devices, and an armature short-circuit braking device for connection to the input side of electrically isolating devices of one bridge side of the bridge circuit. An overvoltage recognition device is provided to receive a signal commensurate with a limit value, and a signal commensurate with a determined actual input voltage of the power converter. A trigger circuit is connected to the armature short-circuit braking device, and has an input connected to an output of the overvoltage recognition device and supplied with a signal for the armature short-circuit braking device.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: September 7, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventors: Gerwin Kissich, Hans Seidner
  • Publication number: 20040130282
    Abstract: A retarded electric motor is disclosed which may be designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve means is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as series motor or as asynchronous motor. If configured as a series motor, the valve means (S1, S2, S3) allows to bypass the armature (12) and to operate the motor (10) as an externally excited direct current generator when switching into braking operation. If configured as an asynchronous motor, a switch is utilized to disconnect at least two field windings from mains. A valve means is utilized to excite the motor externally from mains with a pulsating direct current during braking.
    Type: Application
    Filed: July 23, 2003
    Publication date: July 8, 2004
    Inventors: Christoph Meyer, Christof Kress, Alfred Schreiber
  • Patent number: 6756760
    Abstract: A motor control apparatus and a motor control method that instruct deenergization of a motor a predetermined period of time after an arrival of a subject to be driven by the motor at a speed measuring position. The predetermined period of time corresponds to a current speed of the motor upon arrival of the subject to be driven at the speed measuring position, and the speed measuring position is at a predetermined distance before a target stop position of the subject to be driven.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: June 29, 2004
    Assignee: Seiko Epson Corporation
    Inventors: Hirotomo Tanaka, Hidetoshi Kodama, Masafumi Furuyama, Toshiyuki Takahara
  • Patent number: 6748618
    Abstract: A spin tub of a washing machine is driven by an electronically commutated DC motor. The commutation devices are connected to a DC power supply and have free-wheeling diodes connected in parallel therewith. The washing machine includes other components having inductive windings. A controller terminates commutation of power to the motor windings. A voltage threshold detector monitors the voltage of the power supply. Switching structure connects the inductive winding of an unused component in the machine across the power supply when the detector detects that the voltage has exceeded a predetermined value and subsequently disconnects the inductive winding of the unused component from the power supply when the detector detects that the voltage has reduced below the pre-determined value.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: June 15, 2004
    Assignee: Fisher & Paykel Limited
    Inventors: Adam John Darby, Neil Cheyne, Jonathan David Harwood
  • Patent number: 6741050
    Abstract: A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using various cycles (t1-t2, t3-t4) beginning with zero, such that the driving and braking torques associated with the cycles (t1-t2, t3-t4) produce a resultant braking moment averaged over the phase period (T).
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: May 25, 2004
    Assignee: Hilti Aktiengesellschaft
    Inventors: Walter Wissmach, Rudolf Bauer, Vilmos Török
  • Patent number: 6741062
    Abstract: A circuit configuration supplies an electric motor with a stator and a rotor. The stator has a large number of electromagnets, arranged in particular in the form of a ring, and the rotor has a large number of permanent magnets that are associated with the electromagnets on the stator and are arranged, in particular, in the form of a ring. A rectifier circuit converts the a.c. voltage which is drawn from the supply network to a d.c. voltage. A converter circuit converts the d.c. voltage to a controllable frequency a.c. voltage for supplying the electric motor with electrical drive energy. An energy storage circuit which contains at least one accumulator is connected between the rectifier circuit and the converter circuit.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: May 25, 2004
    Assignee: Innova Patent GmbH
    Inventor: Elmar Fuchs
  • Patent number: 6731034
    Abstract: An electric motor with an electromagnetic brake is disclosed, particularly for use in an angle grinder, which has a stator having at least one pole pair, in which at least one pole has a pole shoe which points to the inside towards the rotor periphery and is surrounded by a stator winding. The pole accommodates the brake means for braking of the rotor of the electric motor. The brake element can be adjusted against the braking force by the magnetic field of the stator winding when the motor is activated. The brake element is constructed of magnetically conductive material as a rocker which is exposed to the braking force off-center of the swivel axis of the brake element. As a result of the off-center application of force the brake element having a disengagement arm can be arranged in the magnetic flux of the stator winding such that a high disengagement moment can be achieved and rapid braking can occur at shutoff.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: May 4, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Michael Habele, Gerhard Kraemer, Alfred Odendahl
  • Publication number: 20040066159
    Abstract: A circuit for controlling a motor's operation is disclosed. The circuit includes a relay and a motor braking circuit portion. The relay selectively interconnects a voltage source with one of a braking terminal and a motor terminal. The motor braking circuit portion has a motor brake switch connected on a first switch side to the motor terminal and a second switch side to the electrical ground. The brake switch is activated to brake the motor when the relay interconnects the voltage source with the braking terminal.
    Type: Application
    Filed: April 14, 2003
    Publication date: April 8, 2004
    Applicant: Visteon Global Technologies, Inc.
    Inventors: Gary E. Zack, Charlie Richlie, Chung H. Peng
  • Publication number: 20040061464
    Abstract: Disclosed is a single-phase motor including a stator, a rotor adapted to rotate when electric power is applied to the stator, a ring-shaped magnet coupled to the rotor to rotate along with the rotor; a parking magnet for stopping the rotor within an effective torque generating region by a magnetic force effected between the ring-shaped magnet and the parking magnet upon braking the rotor, and a sensor unit for sensing a variation in the intensity of a magnetic field generated around the ring-shaped magnet during the rotation of the rotor, thereby sensing the position and speed of the rotor. In accordance with this configuration, the additional device used for an initial driving operation and subsequent operations of the motor can be relatively simple and inexpensive. As a result, there is an advantage in that the motor has an enhanced utility.
    Type: Application
    Filed: November 20, 2002
    Publication date: April 1, 2004
    Applicant: LG Electronics Inc.
    Inventors: Sang Young Kim, Yo Han Lee, Jun Yong Lim, Yong Won Choi
  • Patent number: 6690128
    Abstract: A drive system for a domestic appliance provides inner and outer coaxial drive outlets operative at different speeds and comprises an active limb, which incorporates an electric drive motor and a shaft driven by said motor and coupled to the inner drive outlet to drive it at a selected speed. The system also includes a passive limb which incorporates a rotary component; the two limbs being mounted in fixed relationship to one another. A first speed reduction mechanism couples the shaft to the rotary component of the passive limb and a second speed reduction mechanism couples the said rotary component to the outer drive outlet. Conveniently, the rotary component comprises a further shaft, disposed substantially parallel to the driven shaft of said motor, and both limbs of the system are rigidly mounted to, and supported by, a common framework of support members. Both speed reduction mechanisms are typically belt driven, and may provide identical reductions.
    Type: Grant
    Filed: January 2, 2002
    Date of Patent: February 10, 2004
    Assignee: Kenwood Marks Limited
    Inventors: John Cotton, Laura Gowers
  • Publication number: 20030227270
    Abstract: A drive system for an automotive vehicle of the front-and-rear wheel drive type, comprising a primary drive mechanism for drive of a set of front road wheels and an ancillary drive mechanism for drive of a set of rear roar wheels, wherein the front road wheels are driven by operation of the primary drive mechanism at a two-wheel drive mode and wherein the front and rear road wheels are driven by operation of both the primary and ancillary drive mechanisms at a four-wheel drive mode. In the drive system, a drive power applied to the primary road wheels is restricted to a predetermined value when the vehicle is driven by the primary and ancillary drive mechanisms at the front-and-rear wheel drive mode.
    Type: Application
    Filed: April 25, 2003
    Publication date: December 11, 2003
    Applicant: TOYODA KOKI KABUSHIKI KAISHA
    Inventors: Seitoku Kubo, Tadanobu Kumagai, Toshifumi Sakai, Naoyuki Sakai, Akihiro Ohno
  • Patent number: 6659250
    Abstract: A method of returning an electromechanical axial setting device, particularly suited for friction couplings. The axial setting device includes two setting rings centered on a common axis, one of which is axially held, with the other one being axially displaceably mounted, and one of which is rotationally fixedly held in a housing so as to be prevented from rotating, with the other one being rotatingly drivable. On their respective end faces facing one another, the two setting rings each include an identical multitude of circumferentially extending grooves. Each of the grooves, in a plan view of the end faces, define a depth which rises in the circumferential direction. Pairs of grooves in the setting rings each accommodate a ball. The rotatingly drivable setting ring is connected to an electric motor in respect of drive. The axially displaceable setting ring is loaded by pressure springs towards the axially held setting ring.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 9, 2003
    Assignee: GKN Automotive GmbH
    Inventors: Frank Nestler, Derek Wilson
  • Publication number: 20030222610
    Abstract: A powered panel control apparatus and method is used with an electric motor having a rotatable armature. The control detects and generates time periods between the rotation of the armature over a predetermined constant amount of angular rotation. An average time period is computed over a predetermined number of time periods and compared with a threshold time period to determine if an obstacle is present in the path of movement of the panel. Transient counts are accumulated for increasing average time periods over a number of time period samples to detect an obstacle. Endzone ramp compensation adjusts a threshold for the initial entry of the panel into a seal.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 4, 2003
    Inventor: Joseph P. Whinnery
  • Patent number: 6636010
    Abstract: A liquid dispensing system increases the precision, reliability, and safety of dispensing medications and other liquids. An electronic brake grounds a power terminal of a pump motor to absorb the kinetic energy of the motor and other mechanically coupled components. The electronic brake reduces overage and overage variation in the dispensing of liquids at very little cost or complexity. A watchdog circuit monitors a controller heartbeat signal and disables the motor in the absence of a regular beat. The watchdog circuit along with redundant power switches greatly reduce the possibility of motor runaway in the event of component failure. A controller begins or ends each dispensing cycle with a diagnostic which determines whether the liquid dispensing system is fully operational. If not, the controller may disable the motor, emit an alarm tone, and display an alarm message.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: October 21, 2003
    Assignee: Zevex, Inc.
    Inventors: James Malmstrom, David Soss
  • Patent number: 6577092
    Abstract: A DC motor control apparatus includes Hall effect devices each generating a pulse each time a DC motor rotates a predetermined angle. When a control circuit judges, based on the pulse signals generated by the Hall effect devices, that the rotation rate of the motor has decreased below a predetermined rate, with a command to stop the motor given, the control circuit generates a servo command signal. When the servo command signal is generated, the control signal also generates, based on the pulse signals, a rotation direction indicating signal to indicate that the motor should be driven to rotate in the opposite direction. After generating the servo command signal, the control circuit generates and holds a braking force indicating signal indicating the braking force in accordance with the actual rotation rate of the motor. A driver drives the motor in the direction indicated by the rotation direction indicating signal with a braking force indicated by the braking force indicating signal.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: June 10, 2003
    Assignee: Itoh Electric Company, Limited
    Inventor: Shota Okai
  • Publication number: 20030102833
    Abstract: Brake mode switching signal production means detects the number of revolutions per unit time of a rotor according to a change in a positional relationship between motor windings of a plurality of phases and the rotor so as to output first and second brake mode switching signals for selecting either a short brake mode or a reverse brake mode for braking the rotation of the rotor based on the number of revolutions. Control means outputs an energization control signal for controlling energization of the motor windings of a plurality of phases in response to the first and second brake mode switching signals. Thus, it is possible to reduce the braking noise and the stopping time.
    Type: Application
    Filed: December 3, 2002
    Publication date: June 5, 2003
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventor: Maki Murakami
  • Patent number: 6571163
    Abstract: An electrically controlled, decentralized control system in a vehicle includes at least two energy sources which are independent of one another and at least two control units. In addition, at least one high-current load is allocated to each control unit. The high-current load is permanently allocated to one of the energy sources, while the control units are selectively switchable to the one or the other energy source.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: May 27, 2003
    Assignee: Robert Bosch GmbH
    Inventors: Hans Heckmann, Reinhard Weiberle, Bernd Kesch
  • Publication number: 20030052632
    Abstract: A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using various cycles (t1-t2, t3-t4) beginning with zero, such that the driving and braking torques associated with the cycles (t1-t2, t3-t4) produce a resultant braking moment averaged over the phase period (T).
    Type: Application
    Filed: July 16, 2002
    Publication date: March 20, 2003
    Inventors: Walter Wissmach, Rudolf Bauer, Vilmos Torok
  • Patent number: 6531839
    Abstract: Disclosed is an optimized brake method for braking a motor rotating at a high speed. When the motor rotates at the high speed, the present invention reduces the rotation speed of the motor using a mechanical brake method which has a relatively high rate of energy exhaustion, and when the rotation speed of the motor reduces below a predetermined speed, the present invention stops the motor using an electrical brake method. Therefore, since the mechanical brake method is used during the high speed rotation interval, heat occurrence can be prevented, and the electrical brake method is used during the relatively low speed interval so that the motor can be stopped within a short time.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: March 11, 2003
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Yong-Sang Shin, Dong-Gyu Kim, Sung-Jun Joo
  • Publication number: 20030030394
    Abstract: A controller for power devices which is not required to individually insulate high and low potential portions and to include an insulated power supply is disclosed. An external controller (6) is connected to a second internal control circuit (4) which is in turn connected to a level shift circuit (5) and a gate electrode of a transistor (Q2). Power supply voltage (V1) is applied to the second internal control circuit (4) for operation thereof. The level shift circuit (5) is connected to a first internal control circuit (3) which is in turn connected to a gate electrode of a transistor (Q1) and a charge pump circuit (7). Control of a first semiconductor circuit is made through the level shift means in response to an input signal generated on the basis of a second main power supply potential, thereby achieving increased responsiveness of the power devices to a control signal and improved integration.
    Type: Application
    Filed: October 1, 2002
    Publication date: February 13, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Gourab Majumdar, Shinji Hatae, Tatsuo Oota, Masanori Fukunaga
  • Patent number: 6497182
    Abstract: A railroad locomotive includes traction motors for propelling the locomotive, and an isolation switch disposed in signal communication with at least one of the traction motors for isolating a faulting motor from the other traction motors.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: December 24, 2002
    Assignee: General Electric Company
    Inventors: Donald J. Melpolder, Michael S. Lupichuk
  • Patent number: 6498448
    Abstract: A motor brake releasing device includes an electromagnetic brake for locking a motor shaft and a switch mounted between the electromagnetic brake and a releasing-power-supply for the brake. The switch can be operated by an AND signal produced by a motor driving signal and a motor-brake-release-permitting signal. This structure allows a motor brake to be released when a motor driving system encounters an obstacle, although the motor is left free. The structure also can prevent a final object of the motor shaft from dropping due to its own weight.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: December 24, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Shigeru Shimogama
  • Patent number: 6483268
    Abstract: An electronic brake system for D.C. motors that utilize an electronic switching device in parallel with the motor upon the removal of a D.C. source. A bias circuit is connected to the switching device to keep it in the OFF condition while the D.C. source is applied to the motor. Upon disconnecting the D.C. source, through another switch, the electronic switching device can also be independently biased to permit the motor to coast. A properly biased FET can be used as the electronic switching device with a voltage limiting device connected from the gate to the source, such as a zener diode.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: November 19, 2002
    Inventor: Michael D. Cummins
  • Patent number: 6459224
    Abstract: In a roller conveyor system for carrying out zone control, a conveyed article can be stopped in an approximately constant position without varying the position where the article is stopped in a desired control zone even if the weight of the article varies. In order to syop the article in a predetermined control zone, such stop control is carried out that a motor is decelerated and stopped in a plurality of braking systems depending on the change in the pulse width of a rotational pulse signal to stop the article with high precision in a predetermined stop position.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: October 1, 2002
    Assignee: Itoh Electric Company Limited
    Inventors: Kazuo Itoh, Toshiyuki Tachibana, Yoshiyuki Kujihashi
  • Patent number: 6456032
    Abstract: A motor driver for drive-controlling a brushless motor being provided with a delay circuit that detects the motor pulse. When a stop signal is inputted, a transistor is activated, which in turn activates an electric brake to brake the brushless motor, while at the same time, the motor pulse detected by the motor driver is inputted to the delay circuit. After the stop signal is inputted, the motor pulse declines, which is detected by the delay circuit to activate the electromagnetic brake. The delay circuit is provided on the driver substrate for the motor driver.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: September 24, 2002
    Assignee: Itoh Electric Co., Ltd.
    Inventors: Kazuo Itoh, Toshiyuki Tachibana, Shigeki Fukata
  • Patent number: 6456026
    Abstract: The invention concerns a maintaining, positioning or clamping device comprising at least a housing (18) containing a moving element (17) mobile in translation by the action of actuating means including an electric motor (11). The device comprises means for controlling and powering the electric motor (11), arranged to avoid powering the electric motor in a jamming position with risk of overheating and damaging the electric motor (11). The device is particularly useful for maintaining, positioning or clamping body parts.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: September 24, 2002
    Assignee: Genus Technologies
    Inventors: Michel Morel, Patrice Roudier
  • Patent number: 6373207
    Abstract: The present invention relates to a braking system for a DC motor. The braking system includes a current control element placed across the terminals of the DC motor to regulate the magnitude of the electric current generated by the motor when the motor is in a braking mode of operation. In the most preferred embodiment, the current control element includes a semiconductor switch, such as a transistor, that is repeatedly pulsed on and off to act as a controlled short circuit across the armature of the motor. The rotational energy is dissipated as heat by the inherent resistance of the motor windings that may be augmented by an external resistor, if desired. Another possibility is to use a current control element that includes a variable load designed to dissipate the rotational energy in the form of heat. The impedance of the load element is gradually reduced as the speed of the motor is reduced to maintain the rate of energy dissipation near the peak allowable value for the structure of the DC motor.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: April 16, 2002
    Assignee: Kalish Inc.
    Inventor: Max Yablonovitch
  • Patent number: 6373210
    Abstract: Conventionally converter-controlled electric motors are allowed to operate in generational mode during braking and to convert the electrical energy so produced into heat. Such motors may also comprise electromagnetically actuated mechanical brakes. In the present invention it is proposed to supply the electrical energy produced by the motor when in a generational mode to an excitation coil of the brake and there store it temporarily as magnetic energy or convert it into heat.
    Type: Grant
    Filed: January 4, 2000
    Date of Patent: April 16, 2002
    Assignee: Sew-Eurodrive GmbH & Co.
    Inventors: Jörg Roth-Stielow, Josef Schmidt
  • Patent number: 6369538
    Abstract: This invention relates to a method for braking a washing machine comprising the steps of: determining whether or not a motor is braking; transmitting a PWM (Pulse Width Modulation) control signal by setting up the initial phase and the duty ratio according to the voltage flows in the system when an operation mode determined by the previous step as a braking mode; comparing a capacity and a variance of the detected voltage with a reference voltage predetermined during the previous step; and controlling a motor driver by re-establishing the control phase and the duty ratio are re-established until the motor is stopped when the comparison result of the previous step indicates that the capacity and the variance of the voltage are lower than the predetermined reference level.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: April 9, 2002
    Assignee: LG Electronics Inc.
    Inventors: Sang Chul Youn, Joo Hwan Lee, Chul Woong Lee, In Hwan Ra
  • Publication number: 20010038270
    Abstract: Conventionally converter-controlled electric motors are allowed to operate in generational mode during braking and to convert the electrical energy so produced into heat. Such motors may also comprise electromagnetically actuated mechanical brakes. In the present invention it is proposed to supply the electrical energy produced by the motor when in a generational mode to an excitation coil of the brake and there store it temporarily as magnetic energy or convert it into heat.
    Type: Application
    Filed: January 4, 2000
    Publication date: November 8, 2001
    Inventors: JORG ROTH-STIELOW, JOSEF SCHMIDT
  • Patent number: 6299261
    Abstract: An electric brake system for a motor vehicle includes a first unit which receives operating signals from at least one driver-operated brake operating element and determines the setpoints for controlling the wheel brakes on the basis of the operating signals. The electric brake system also includes second units assigned to the wheel brakes of the motor vehicle to convert the setpoints into control signals for the wheel brakes. The second units are each assigned individually to an individual wheel brake, and each includes a self-monitoring microcomputer system. At least one of the second units is assigned to the front wheel brakes, and at least one unit is assigned to the rear wheel brakes. At least the second unit assigned to the front wheel brakes is redundantly connected to the other units via two communication systems.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: October 9, 2001
    Assignee: Robert Bosch GmbH
    Inventors: Reinhard Weiberle, Peter Blessing
  • Patent number: 6296325
    Abstract: A method is provided for arranging the components and power connection points within an electromechanical braking system architecture in order to better maintain isolation of the power busses, and thereby improve overall integrity of the system, while still meeting system redundancy, performance and safety requirements as in the past. In addition, a method is provided for connecting and efficiently using available power in emergency braking and parking modes.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: October 2, 2001
    Assignees: The B. F. Goodrich Company, Aerospatiale Matra Airbus
    Inventors: Lawrence F. Corio, Robert L. Brundrett, Mihai Ralea, Rollin W. Brown, Jean Pierre Garcia, Cedrick Lauzier
  • Patent number: 6294887
    Abstract: A brake release circuit of an electromagnetic brake for locking a motor and an indication circuit for indicating a brake release are coupled together. Both the circuits may be turned on and off by a single switch contact. A motorbrake release device secures space saving and high safety, and is economical.
    Type: Grant
    Filed: April 14, 2000
    Date of Patent: September 25, 2001
    Assignee: Matsushita Electric Industrial Co. Ltd.
    Inventors: Shigeru Shimogama, Yasumichi Muto
  • Patent number: 6291951
    Abstract: A holding brake control circuit is provided for use in conjunction with a servo-motor having an electrically operated holding brake. The holding brake has a pair of electric brake terminals and the brake is retained in a released condition as long as at least a preset brake voltage is maintained to the brake terminals. The holding brake control circuit includes a pair of output terminals connected to the electric brake terminals as well as a pair of power input terminals electrically connected to an electric power source. The electric power source, furthermore, has a higher voltage than the preset brake voltage. At least one capacitor is electrically connected in parallel with the input terminals so that the capacitor charges when power is applied to the input terminals. A voltage regulator has power inputs connected in parallel with the capacitor and a regulated voltage output connected in parallel with the output terminals for the control circuit.
    Type: Grant
    Filed: March 21, 2000
    Date of Patent: September 18, 2001
    Assignee: Valiant Machine & Tool Inc.
    Inventor: Dominique Baulier
  • Patent number: 6274992
    Abstract: The specification discloses a braking method for a single-phase motor, which is applied to a single-phase DC brushless motor driven by a three-phase motor driving IC. The invention uses a control unit to compute the rotational speed of the single-phase motor according to a rotation number signal generated by the motor rotational axis. When the rotational speed is below a threshold, the motor driving IC is controlled to stop rotating the single-phase motor. Through the single-phase motor braking method disclosed herein, the problem of unable to determine the rotational direction of a single-phase motor within a three-phase motor driving IC existing in the prior art can be solved by merely modifying the program in the control unit without adding system elements.
    Type: Grant
    Filed: August 17, 2000
    Date of Patent: August 14, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: King Yin Wang, Li-Te Kuo, Yao-Yu Lee, Ming-Jiou Yu, Der-Ray Huaug
  • Patent number: 6236177
    Abstract: A power tool including a braking and control circuit. The braking and control circuit includes a microcontroller-based control means circuit. The microcontroller assures control of switch means, such as triacs, switches and relays, and ensures that braking is effectuated regardless of the phase in the power cycle of the alternating current. Also, the microcontroller is programmable so that the braking and control circuit accommodates different braking conditions for different power tools and accommodates combinations of braking conditions for the same power tool. Further, the microcontroller is programmable to configure the braking and control circuit so that the braking force applied to the motor and the stopping time of the motor are regulated and adjustable. This may be accomplished by outputting a control signal so that the switch means skips cycles in the alternating current or by otherwise adjusting the operation of the switch means.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: May 22, 2001
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: Jonathan A. Zick, Joseph W. Willhide
  • Patent number: 6208111
    Abstract: An improved motor starter assembly is provided on a frame and having an external profile which matches that or is within that of a prior motor starter is disclosed. The improved motor starter assembly provides a soft start circuit within the profile. Retrofitting of prior art motor starters is accomplished by moving the power fuses and related hardware of an existing medium voltage (2.4 Kv to 7.2 Kv) and installing the new soft start circuit on the frame of the existing motor starter. The retrofitted arrangement mounts the motor fuses horizontally and the vacuum contactors vertically in an arrangement to provide enough space within the external profile to mount the soft start circuit arrangement.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: March 27, 2001
    Inventor: Kevin R. Williams
  • Patent number: 6177772
    Abstract: A circuit and method for braking a disk drive when a power fault occurs has a circuit (10) for producing an output signal (28) indicating that the motor of the disk drive has slowed at least to a predetermined rotational speed after the occurrence of the power fault. The components of the circuit (10) may be integrated onto the same integrated circuit as the motor driving circuitry or head retract circuitry. During the time between the occurrence of the power fault and the time the disk drive has slowed to the predetermined rotational speed, the read/write head mechanism (17) is retracted. A braking circuit then brakes the disk drive when the output signal (28) indicates that the motor has slowed, at least to the predetermined rotational speed. The circuit for producing an output signal indicating that the motor has slowed at least to the predetermined rotational speed is actuated by the back-emf (14) generated by the motor failing below a predetermined level.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: January 23, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Shaibal Barua, William R. Krenik
  • Patent number: 6158822
    Abstract: A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein a wheel is braked by a friction force generated by an electric motor of the brake upon an operation of a brake operating member, the method comprising the steps of: applying an abnormality checking drive signal to the electric motor to operate the electric motor while the brake operating member is placed in a non-operated position; detecting a quantity relating to an output of the electric motor while the drive signal is applied to the electric motor; and determining that the electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of the abnormality checking drive signal.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: December 12, 2000
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenji Shirai, Yasunori Yoshino, Akihiro Otomo
  • Patent number: 6153992
    Abstract: A running gear for hoists and suspended loads has a running rail with two spaced-apart travel tracks that support axially spaced-apart running wheels. An electric motor is coupled to a self-locking worm gear for directly driving one of the running wheels. The running wheels are rotatably supported in a frame to which an assembly for hoisting suspended loads is secured. In order to prevent the running gear from rolling and pitching during braking, which can cause increased wear of the running gear and the running rail, a control unit is provided which is operatively connected to the electric motor and determines a start-up rate during the start-up phase of the motor from an average increase of the motor torque as a function of time, and decreases the motor torque as a function of time at a slower rate than the start-up rate for slowing down the running gear.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: November 28, 2000
    Assignee: Mannesmann AG
    Inventors: Udo Gersemsky, Axel Hauschild, Rolf Koschorrek, Torsten Sattler
  • Patent number: 6141199
    Abstract: A device for protecting a braking resistor for locomotives supplied with AC power obtained by chopping the DC voltage from the power grid comprising at least one pack of resistive components of the resistor which has at least one reference resistive component which is made of a different material than the other resistive components of the pack but is suitable to react thermally in the same manner as the other resistive components of the pack when it is crossed by the same current, and a control circuit which is associated with the pack of resistive components and is suitable to detect their temperature by detecting the variations in the electrical characteristics of the reference resistive component.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: October 31, 2000
    Inventor: Manuela Fornari
  • Patent number: 6121739
    Abstract: The invention relates to a method for enhancing the dosing precision of a dosing pump which is driven by an asynchronous motor via an eccentric gear. The supply of the motor is cut off approximately half a cycle time before a desired dosing pause period or stoppage. The motor freewheels afterwards for part of the cycle time, before a direct voltage is applied to it for approximately a quarter cycle time, such that an eddy current is induced in the rotor, which produces an antipolarized magnetic field which brakes the rotor.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: September 19, 2000
    Assignee: Lang Apparatebau GmbH
    Inventor: Albert Haberlander
  • Patent number: 6121740
    Abstract: A method and apparatus are disclosed for controlling regenerative energy from an induction motor. The induction motor is connected to a battery, which is intended to capture the regenerative energy of the induction motor. Normally, the induction motor is operated at peak efficiency, to capture as much energy as possible. However, when the battery becomes nearly fully charged, the induction motor is operated at reduced efficiency to prevent overcharging of the battery. The operating point of reduced efficiency of the induction motor is a point at which electrical losses are relatively more located in the stator of the motor than in the rotor of the motor. The stator of an induction motor is generally better cooled than the rotor.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: September 19, 2000
    Assignee: Ford Global Technologies, Inc.
    Inventors: Allan Roy Gale, William Lester Kelledes
  • Patent number: 6118234
    Abstract: A double pole, double throw switching arrangement for effecting dynamic rotor braking of user controlled operation of a reversible direct current servo motor. Two columns of stationary center and oppositely disposed side contacts are disposed in spaced parallel arrangement on the switch base. One side contact in one column is connected to the opposite side contact in the other column and to the B+ supply. The remaining side contacts in each column are connected to a ground strap having a portion disposed for wiping contact. A pair of commonly user actuated moveable contact members are disposed for sliding contact with each column of contacts. The center contact in each column is connected to one end of a separate forward and reverse motor coil. In the neutral position both motor coil contacts are grounded. User movement of the common actuator in one direction simultaneously causes the moveable contact members to keep one motor coil grounded and connect the other motor coil to B+.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: September 12, 2000
    Assignee: Eaton Corporation
    Inventors: Michael T. Marcellus, Anthony J. Novelle, G. Scott Grafer
  • Patent number: 6104154
    Abstract: A tricycle with an electric motor in which two rear wheels 4 and 4 are driven by not only an electric motor 5, but also pedals 6 with manpower. A rotational force of the pedals 6 is transmitted to drive shaft 9 via first bevel gears 8a and 8b and then transmitted to a one-way clutch 7 via second bevel gears 10a and 10b from the drive shaft 9. The output of the one-way clutch 7 is then transmitted to the two rear wheels 4 and 4. The electric current to the electric motor is a pulse current and its pulse width is controlled to be shorted in relation to a braking operation.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: August 15, 2000
    Assignee: Daiwa Sangyo Co., Ltd.
    Inventors: Tomitaro Harada, Ryoji Iwakiri, Ichiro Kagawa
  • Patent number: 6104153
    Abstract: A disk drive employs a method of operating a spindle motor to respond to a spin-down command to reduce the time required for spinning down and subsequently spinning up the spindle motor. The disk drive is connectable to a power supply having a fixed DC voltage. The spindle motor includes a stator having a plurality of windings and a rotor rotatable at a variable spin-rate. The rotor has an angular position relative to the stator. The disk drive includes switching elements coupled to the fixed DC voltage and the plurality of windings. The switching elements are controlled to sequentially apply the fixed DC voltage across a selected combination of the windings to generate a negative torque on the rotor such that a controlled braking operation is performed to decelerate the rotor to a selected spin-rate .omega.1. After the variable spin-rate is reduced to the selected spin-rate .omega.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: August 15, 2000
    Assignee: Western Digital Corporation
    Inventors: Raffi Codilian, Steven Nemshick, Robert P. Ryan
  • Patent number: 6094023
    Abstract: A method and a device for electrical braking of an all-mains motor by which disconnection of supplied feed current to the motor causes an electric switching operation, whereby electric current arranged to cause a reversed rotary direction for the rotor (1) of the motor is supplie. According to the invention, supplied braking power (P) is controlled and reduced on basis of the successive reduction of rotary speed for the motor until the rotor (1) of the motor has substantially completely ceased to rotate, preferably substantially corresponding to an inverted "soft start" for the motor, whereafter supplied braking current feed is interrupted. It is advantageously monitored whether or not normal start of the motor has been performed, electric switching to braking only being made possible provided that such a start sequence has been indicated.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: July 25, 2000
    Inventor: Hans Birger Ericsson
  • Patent number: 6087792
    Abstract: The present invention relates to a control circuit for motor of electric jogging device in which a safety switch is disposed between an electronic loop and a power switch and which has an inserted safety plug-in pin to connect the power in an ON state. Accordingly, when the safety plug-in is removed from the fastening position, the second safety switch will be shut down in an OFF state so that the power won't enter into the electronic loop again and the motor won't be driven, and the safety of the user can be ensured.
    Type: Grant
    Filed: April 21, 1999
    Date of Patent: July 11, 2000
    Inventor: Leao Wang
  • Patent number: 6084365
    Abstract: An electromechanical actuator is adapted to be connected to an external device for displacing the external device to a predetermined position and maintaining the external device at that position. The actuator includes a housing which holds a drive motor for driving the external device to the predetermined position when the motor is energized and a brake mechanism for maintaining the external device at the predetermined position when the brake mechanism is activated. A switching device generates switching signals for energizing the motor to drive the external device to the predetermined position and for de-energizing the motor and activating the brake mechanism when a predetermined time has passed from a moment the drive motor is energized, to maintain the external device at the predetermined position.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: July 4, 2000
    Assignee: Siemens Building Technologies, Inc.
    Inventors: Dean B. Anderson, Guy P. Caliendo, Mike Strozewski