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| Number | Title | Issue Date |
| 7554276 | Protection circuit for permanent magnet synchronous motor in field weakening operation A safety circuit for providing protection against failures that impact safety of an inverter circuit driving a Permanent Magnet Synchronous Motor (PMSM) including high and low side switches connected in a bridge and driven by a gate driver circuit during operation o... | 06/30/2009 |
| 7489093 | Method and apparatus for producing tractive effort An apparatus for producing tractive effort, the apparatus comprising: an energy source adapted for generating a high DC voltage; a motor drive adapted for generating a motor voltage from the high DC voltage; and a motor adapted for producing the tractive effort from... | 02/10/2009 |
| 7482766 | Motor drive device A motor drive device, for driving an electric motor having a bearing for rotatably supporting an output shaft, has a drive circuit which drives the motor when a voltage level at a signal input terminal of the drive circuit becomes greater than a threshold value. The... | 01/27/2009 |
| 7345437 | Rechargeable vacuum with reduced AC voltage A motor is disclosed that operates on either AC outlet power or DC battery power with decreased power drop when switching between AC and DC power. The AC power to the motor may be stepped down by using a clipper circuit, while the DC power supplied to the motor may ... | 03/18/2008 |
| 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 |
| 7289288 | Disk drive having hybrid spindle speed control and related method A disk drive is disclosed having hybrid spindle speed control. The disk drive includes a disk having a plurality of servo wedges, and a spindle motor for rotating the disk at an operating speed. The spindle motor generates a back electromotive force (BEMF) voltage. ... | 10/30/2007 |
| 7268513 | Motor/generator unit A motor/generator unit in which a motor/generator and an invertor part are integrated and the wiring of a field circuit part for supplying current to a winding on a rotor is rationalized. In a motor/generator unit in which a motor/generator body part having a field ... | 09/11/2007 |
| 7248015 | Variable speed motor control circuit A control system and method for controlling the speed of a PSC motor having an auxiliary winding configured to provide torque for initial motor startup and a run winding configured to provide continuous motor operation. The motor is coupled to a capacitor configured... | 07/24/2007 |
| 7242172 | Microprocessor die with integrated voltage regulation control circuit An integrated circuit die includes a microprocessor and a control circuit to control elements of a voltage regulator to supply power to the microprocessor. ... | 07/10/2007 |
| 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 |
| 7197390 | Electric vehicle with adaptive cruise control system A novel system for adaptively controlling an electric vehicle to maintain desired speed under variable driving conditions. The system includes a control circuit for producing a control signal to control an electric motor of the vehicle. The control signal is formed ... | 03/27/2007 |
| 7193385 | Digital control of motor drives A digital controller is easily implemented for variable speed or torque control of an electric motor or generator by using a comparator to determine a choice of control state outputs. ... | 03/20/2007 |
| 7183728 | Motor drive system and process A motor drive system includes a multi-output dc power source providing three or more output potentials, and a switching circuit including switching devices connected, respectively, with the output potentials of the multi-output power source. A controller determines ... | 02/27/2007 |
| 7165746 | Vibration motor primary flight control actuator The invention provides an actuator for a control surface (7), in particular for a primary flight control of an aircraft, the actuator including a main actuator (3) in a main control line (1) for actuating the control surface (7), the actu... | 01/23/2007 |
| 7164253 | Motor drive control apparatus On end of a reactor (L1) is connected to a positive electrode of a battery (B1) and the other end is connected to a power line via a transistor (Q1) and to the ground via a transistor (Q2). By PWM control of the transistors (Q1, Q | 01/16/2007 |
| 7119504 | Protective circuit for reducing electrical disturbances during operation of a DC motor A protective circuit, for reducing electrical disturbances or interference during operation of a DC motor, features a series transistor (62) arranged in a supply lead from a DC voltage source (12) to a DC motor; an auxiliary voltage source (52),... | 10/10/2006 |
| 7116066 | Power supply circuit of a high speed electric motor A power control system (12) for an electric motor having at least one magnetic bearing includes a DC/DC converter (18) supplied from a DC link bus (179) connected to a main power supply (14), the bus (17) supplying power for the el... | 10/03/2006 |
| 7112932 | System-on-chip for high voltage applications A system-on-a-chip (SOC) in CMOS technology capable to support high voltage applications has been achieved. The single chip system of the present invention comprises high-voltage circuitry, a complete micro-controller system including all timing control, interrupt l... | 09/26/2006 |
| 7106025 | Cancellation of dead time effects for reducing common mode voltages Methods and apparatus for canceling dead time effects in the form of common mode voltages produced by a three-phase power conversion device in a rectifier/inverter variable frequency drive (VFD) system includes limiting the voltage difference between phase voltages ... | 09/12/2006 |
| 7106022 | Velocity controlled disk drive head retraction with offset removal A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor. The control apparatus includes a measuring circuit with an output during a measuring phase including a back electromotive force (back EMF) from the electr... | 09/12/2006 |
| 7098628 | Generation control system A generation control system for a vehicle includes an ac generator, a field current control unit that controls the duty ratio of field current of the ac generator, a field current detector, a load current detector, a generator rotation speed detector, a driving-torq... | 08/29/2006 |
| 7088061 | Drive system for a group of machines A drive system powering a group of machines each fitted with a rectifying unit, wherein the inputs of the control devices of the machines' drive motors are interconnected by an electrical bus which implements a power exchange. The system enables swapping current fro... | 08/08/2006 |
| 7081727 | Regenerative charging for portable electronic devices In a portable electronic device having a data-storage drive that employs a rotatable data-storage carrier, as the data-storage carrier undergoes spin-up and spin-down cycles when the data-storage drive is being accessed, the electronic device recaptures at least a p... | 07/25/2006 |
| 7078877 | Vehicle energy storage system control methods and method for determining battery cycle life projection for heavy duty hybrid vehicle applications A method for equalizing a storage parameter for a vehicle energy storage system having one or more energy storage banks associated therewith includes identifying a quiescent period of operation for the vehicle, and determining whether the value of a defined storage ... | 07/18/2006 |
| 7064919 | Disk storage apparatus In a disk storage apparatus having an actuator for loading/unloading a magnetic head with respect to a magnetic disk, a voltage signal generated when the actuator is driven is detected by a voltage detector, a speed load estimator estimates moving speed of the head ... | 06/20/2006 |
| 7045979 | Multiple-speed electric machine and method of operating the same An electric machine assembly having an electric machine. The electric machine can include a first speed circuit and a second speed circuit. In some constructions, both speed circuits can be of a permanent split capacitor design. At least one of the speed circuits ca... | 05/16/2006 |
| 7042187 | Control apparatus for electric actuator A driver for an electric actuator comprises a direction-switching means which switches a direction of rotation of a rotary driving source based on a direction instruction input signal, a current amplifier/limiter which converts a voltage outputted from the direction... | 05/09/2006 |
| 7034500 | Electric drive assembly An electric drive includes a rotatable shaft, a first drive member, and a second drive member, and is supplied with power from a controller. The controller is operable to supply a first power from a power electronics converter, and a second power that is line power.... | 04/25/2006 |
| 6975080 | Rotating electrical machine for vehicle A rotating electrical machine for a vehicle is capable of improving the acceleration performance and the fuel mileage of the vehicle while achieving the prevention of occurrence of overvoltage and the improvement of its power generation characteristic at the same ti... | 12/13/2005 |
| 6940238 | Single coil, direct current permanent magnet brushless motor with voltage boost A single coil, direct current permanent magnet brushless motor including a stator including six alternately-wound coils connected into a single coil having first and second ends, the oppositely-wound coils forming stator poles, and six magnets of alternating polarit... | 09/06/2005 |
| 6930460 | Load driver with power storage unit In a load driving arrangement, electric power is supplied from an auxiliary battery to a main power supply when the power stored by charging in the main power supply is scarce at the startup of the system. The power is supplied to the main power supply by closing re... | 08/16/2005 |
| 6806671 | Power supply system and power supply method Power from a high voltage battery (10) (for example 36V) is supplied through an inverter (12) to a motor generator (14). A low voltage battery (20) (for example 12V) is connected through a reactor (18) to the neutral point of the m... | 10/19/2004 |
| 6404151 | Electric vehicle drive An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy... | 06/11/2002 |
| 6363214 | System for controlling the motion of an arm carrying a read/write head during load and unload operations A method for controlling an electromagnetic actuator having an arm connected thereto uses a circuit that temporarily places in a high impedance state output nodes connected to a winding of the electromagnetic actuator. A detected BEMF is compared with a l... | 03/26/2002 |
| 6094020 | Disk drive utilizing Bemf of spindle motor to increase VCM voltage during seeks A disk drive is connectable to a power supply having a fixed DC voltage. The disk drive includes a voice coil motor (VCM) and a spindle motor having a plurality of windings and a rotor rotatable at a variable spin-rate. A spindle motor driver is coupled t... | 07/25/2000 |
| 5965992 | Charging capacitor during track following in disk drive to provide increased VCM voltage during a seek A disk drive is connectable to a power supply having a fixed DC voltage. The disk drive includes a voice coil motor. The fixed DC voltage is supplied to a first node. A capacitor is coupled between the first node and a second node and is charged to approx... | 10/12/1999 |
| 5811953 | Motor driving circuit and method A motor driving circuit coupled to a motor having a plurality of phases of coils includes a standard power source generating a first power supply voltage, and a step-up power source for generating a second power supply voltage greater than the first power... | 09/22/1998 |
| 5780980 | Electric car drive system provided with hybrid battery and control method In an electric car drive system having a car drive motor powered by a mounted direct current power supply, a control system including a signal generating means is provided to generate signals which control motor speed. The direct current power supply is c... | 07/14/1998 |
| 5764007 | Micro-processor based motor control integrated circuit including a boost regulated DC-to-DC converter A single chip integrated circuit includes a boost regulated DC-to-DC converter and gate drive circuits integrated on the same die with a micro-processor, along with high density digital logic functions, analog functions, etc. The gate drive circuits are u... | 06/09/1998 |
| 5682459 | Speed control for controlling the speed of a DC motor A speed control for controlling the speed of a DC motor provides improved speed regulation during transient loading conditions. The control includes a regulating circuit having an output for controlling the armature voltage to the motor, An input speed re... | 10/28/1997 |
