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| Number | Title | Issue Date |
| 7456594 | Electric motor brake engagement holdup system An electric motor system includes a motor brake control circuit that uses current induced in the motor stator from generated back EMF to keep the motor brake energized and in its disengaged position, should electric power be lost to the motor system. When the motor ... | 11/25/2008 |
| 7436137 | Drive regenerative control system Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a cont... | 10/14/2008 |
| 7362063 | Motor spindle control system and method In a method for measuring motor speed and position by detecting the back-EMF generated during pole-pair interactions, fluctuations of a three-phase motor power supply that may affect back-EMF detection are reduced. One phase of the power supply is tristated for a ce... | 04/22/2008 |
| 7309967 | Motor drive circuitry with regenerative braking for disk drive During normal operation of a hard disk drive, control logic controls a plurality of switching elements to provide electrical power to a spindle motor and head motor of the disk drive from a voltage source coupled to first and second voltage supply nodes (e.g., Vcc a... | 12/18/2007 |
| 7291997 | Servo system A motor has built therein a brake for stopping the rotation of the motor and a brake controlling circuit for controlling the brake. The motor is further provided with a bypass circuit for supplying an electric power directly to the brake and a terminal for connectin... | 11/06/2007 |
| 7279858 | Drive regenerative control system Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a cont... | 10/09/2007 |
| 7248008 | Shaded-pole A.C. motor with dynamic brake Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem swit... | 07/24/2007 |
| 7227323 | Motor driving apparatus A motor driving apparatus applicable to various types of motor driving apparatuses and having a power storage section for storing a regenerative current and supplying power to an inverter section at the time of acceleration. The motor driving apparatus further compr... | 06/05/2007 |
| 7227321 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/05/2007 |
| 7196484 | Motor spindle control system and method In a method for measuring motor speed and position by detecting the back-EMF generated during pole-pair interactions, fluctuations of a three-phase motor power supply that may affect back-EMF detection are reduced. One phase of the power supply is tristated for a ce... | 03/27/2007 |
| 7170246 | Motor control apparatus A motor control apparatus supplying braking power to brake a motor comprises a braking power providing unit to receive input power having an input power voltage lower than a braking power voltage and to boost the input power voltage up to the braking power voltage t... | 01/30/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7132810 | Power supplying apparatus and power supplying method An apparatus for supplying a power to a motor for driving a mechanism that conveys a cartridge of a storage medium includes an accumulating unit that accumulates a regenerative power generated by the motor in a capacitor; and an adjusting unit that adjusts, when the... | 11/07/2006 |
| 7109686 | System and method for precharging and discharging a high power ultracapacitor pack This invention is a system and a method that uses the braking resistor, commonly used and available in electrically or hybrid-electrically propelled vehicles, to limit the precharge current during the startup of a high power ultracapacitor pack energy storage device... | 09/19/2006 |
| 7019472 | Vehicle controller that stably supplies power to a battery and method thereof A vehicle and method of operating a vehicle including a motor that supplies a driving force to a wheel, a battery that supplies electric power to the motor and receives regenerative electric power from the motor and a controller that detects a state of the battery a... | 03/28/2006 |
| 7015672 | Method for controlling a variable-reluctance machine A method of controlling a machine including at least one inductive coil (n), the inductive coil being connected to a primary electricity power supply network (RP) via a control circuit comprising, between a connection point (A) of the coil (n) in question and termin... | 03/21/2006 |
| 7005817 | Energy conserving disc drive A disc drive includes a disc mounted to a rotatable spindle, a motor coupled to the spindle, and motor control circuitry. The motor has a motoring mode in which it rotates the spindle and a braking mode in which is decelerates the rotating spindle and generates powe... | 02/28/2006 |
| 6975085 | Electronic motor brake According to an aspect of the invention, an electronic motor brake is provided which includes a braking circuit including one or more discharge devices connectable to one or more of a plurality of power supply lines carrying respective phases of a power supply for d... | 12/13/2005 |
| 6879123 | Device to control a 3-phase motor A device to control a 3-phase motor having an inverter connected to each phase terminal and a brake to arrest the 3-phase motor, includes a power supply to supply power to the brake and the inverter at the same time based on a predetermined synchronization signal. T... | 04/12/2005 |
| 6653805 | Method and apparatus for spinning a multiphase motor for a disk drive system from an inactive state A method and apparatus are disclosed for controlling the operation of a multiphase motor, and particular to spinning the motor from an inactive state to an operable state. The method and apparatus include initially sensing an electrical characteristic of ... | 11/25/2003 |
| 6188192 | Spindle motor back-EMF synchronous rectifier A disk drive system including a disk having a magnetic surface and suppported for rotation on a spindle, a magnetic head being movable relative to the magnetic surface, and a spindle motor for driving the spindle. The motor generates a back-EMF voltage du... | 02/13/2001 |
| 6104155 | Controlled braking device for electric motors and in particular portable tools An electric motor (10,110,210) comprises a TRIAC (16, 116, 216) for controlling the application power to the motor and a switch (18,118,215a) for controlled cut-off of the power supply. Upon operation of a switch (15b, 115B, 215B) for short-circuiting of ... | 08/15/2000 |
| 6094025 | Controlled braking device for electric motors and in particular portable tools An electric motor (10, 110, 210) is coupled to a TRIAC (16, 116, 216) for controlling the application of power to the motor from a power supply (13, 14; 113, 114; 213, 214) and a switch (18, 118, 215a) for controlled cut-off of the power supply. Upon oper... | 07/25/2000 |
| 5631813 | Regenerative AC/DC/AC power converter for a plurality of motors An inverter apparatus which controls an induction motor, has a forward converting unit, and can be combined with a power regeneration unit. The regenerative power converting unit has circuit arms, each being a parallel connection of a switching element an... | 05/20/1997 |
| 5504402 | BEMF rectification voltage when power supply energy fails In a disk drive, the read-write heads of the disk drive should be parked during a power failure. The kinetic energy of the spinning rotor is used to move the head away from the disk's surface. A high voltage is produce from the low voltage spindle motor b... | 04/02/1996 |
| 5311069 | Driver circuitry for commutated inductive loads The present invention provides driver circuitry for commutated inductive loads, and in particular, inductive loads employed in multi-pole DC brushless motors. The preferred embodiment of the present invention typically implements three pull-up and three p... | 05/10/1994 |
| 4409525 | Vehicle A battery operated vehicle having a charging device for charging the battery from an external source of power, said device being integrated with the electrical system of the traction motor. The speed of said traction motor is controlled by a chopper-contr... | 10/11/1983 |
| 4132934 | Electric motor driven vehicles A control arrangement is described for dynamically braking a vehicle driven by an electric motor having a single field winding. The control arrangement comprises means for controlling the supply of power to the motor, a permanent magnet generator for mech... | 01/02/1979 |
| 4092577 | Dynamic braking of direct current motors A braking system for, primarily, separately excited D.C. traction motors, in which rheostatic braking is effected by field reversal to generate armature current freewheeling through the low impedance supply and through a brake resistor in series with the ... | 05/30/1978 |
| 3965404 | Apparatus and method of braking a universal motor for operating a compact winch In a universal motor particularly adapted for operating a compact winch, triggering the dynamic braking, as may be required in an overhauling load condition by applying a pulse of current through the field winding as to produce a magnetic field to assured... | 06/22/1976 |
