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| Number | Title | Issue Date |
| 7805063 | Speed control system for a ceiling fan motor The invention teaches a speed control system for a brushless DC motor for a ceiling fan, comprising a power circuit 1, a microprocessor circuit 2, a power drive circuit 3, a speed regulation circuit, and a brushless DC permanent magnetic motor | 09/28/2010 |
| 7531975 | Adjustable frequency PWM driver A spindle/voice coil motor (VCM) driver includes a clock management module that receives a system clock signal and a second clock signal, and that selects one of the system clock signal or the second clock signal as a selected clock signal. A reference generating mo... | 05/12/2009 |
| 7412156 | Brushless DC motor driver circuit capable of reducing vibration or shock noise and method thereof The present invention discloses a brushless dc motor driver circuit capable of reducing vibration or shock noise and a method thereof. The brushless dc motor driver circuit of the present invention comprises a Time-Voltage Digital/Analog Converter. The Time-Voltage ... | 08/12/2008 |
| 7323839 | Direct current motor controlling method A direct current motor controlling method includes a mean for transforming a duty signal to computed value by a microprocessor unit. The microprocessor unit computes the computed value and then produces a target value by executing a dichotomy method, a rotation meth... | 01/29/2008 |
| 7274865 | General purpose 100% solid state drive for direct current rotary machines General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as mo... | 09/25/2007 |
| 7272302 | PSC motor system for use in HVAC applications with field adjustment and fail-safe capabilities A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides... | 09/18/2007 |
| 7272303 | Method and control circuit for driving an electric motor of a seatbelt retractor An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are provided each of which has a trigger input and a control signal outp... | 09/18/2007 |
| 7268508 | Direct current motor control circuit and wiper system using said circuit The invention relates to a direct current motor control circuit. The invention also relates to the use thereof in a windscreen wiper system for vehicles. An MOS FET transistor with an anti-parallel diode (M3) is serially mounted on the braking system (M2 | 09/11/2007 |
| 7190145 | Method and apparatus for improving speed measurement quality in multi-pole machines A method and apparatus for improving speed measurement quality in systems having multi-pole machines is taught. The method compensates for pole misalignment by computing speed based upon moving average techniques. In one embodiment, a moving average speed averaged o... | 03/13/2007 |
| 7148652 | Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors A controller for a variable frequency drive monitors electrical power from a variable frequency drive motor while a brake is maintaining a load driven or moved by the motor without requiring additional feedback components of a closed loop configuration. If excess el... | 12/12/2006 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 7126307 | Interface circuit for actuating an electrical device and circuit arrangement for actuating an electric motor therewith An interface circuit for actuating an electrical consumer, especially a pole-changing rotary-current induction motor, with a first contact element assigned to a signal line carrying an alternating voltage signal to generate at least two different control signals. A ... | 10/24/2006 |
| 7124691 | Method for monitoring and controlling locomotives The present invention is directed to a locomotive comprising energy storage units, such as batteries, a prime energy source, such as a diesel engine, and an energy conversion device, such as a generator. The locomotive comprises one or more of the following features... | 10/24/2006 |
| 7081735 | System and method for bypassing a motor drive A motor control system comprising a plurality of motor controllers and a power source adapted to drive an electric motor. The motor control system comprises a switch that is selectively operable between at least a first position and a second position. In the first p... | 07/25/2006 |
| 7068455 | Method and system for reducing power consumption in a rotatable media data storage device Methods and systems in accordance with embodiments of the present invention can provide for reduced power consumption in rotatable media data storage devices. A voice coil motor or spindle motor driver configured to operate as a linear driver can be operated in a qu... | 06/27/2006 |
| 7064509 | Apparatus for DC motor position detection with capacitive ripple current extraction An apparatus for determining angular positions of DC motor includes a capacitor connected in parallel with the DC motor. The current flowing through the capacitor, at any given time, is an AC ripple current responsive to a commutation event of the DC motor. The capa... | 06/20/2006 |
| 7062159 | Device for correcting a digital estimate of an electric signal A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signa... | 06/13/2006 |
| 7047119 | Circuit arrangement and method for measuring current in vehicle braking systems The present invention relates to a circuit arrangement for controlling the current in loads by modulation of the pulse width, comprising at least two driver stages (10) provided for the actuation of the loads, and one or more current measuring devices (3 | 05/16/2006 |
| 7035032 | Method and system for reducing power consumption in a rotatable media data storage device Methods and systems in accordance with embodiments of the present invention can provide for reduced power consumption in rotatable media data storage devices. A voice coil motor driver configured to operate as a linear driver can be operated in a quasi-switch mode, ... | 04/25/2006 |
| 7006321 | Data storage apparatus, rotation control apparatus, and rotation control method The object is to raise controller gain while absorbing magnet position dispersion in a motor, and implement rotation control that is resistant to the influence of disturbance. There are provided a spindle motor 3 that performs rotational drive of a predetermi... | 02/28/2006 |
| 6891346 | Commutation and velocity control system for a brushless DC motor A commutation and velocity control system of a brushless DC motor receives a velocity command signal and provides command signals to drive the brushless DC motor. The system includes a summer that receives the velocity command signal and a velocity feedback signal a... | 05/10/2005 |
| 6832127 | Motor controller A motor controller comprising a machine system (12) having a load machine (1), a transmission mechanism (2) for transmitting power, and a motor for driving the load machine through the transmission mechanism; a simulator unit (11) having ... | 12/14/2004 |
| 6803735 | Speed-based open-loop start-up method for brushless DC motor A method of starting a brushless DC motor 12 at any initial speed (A) establishes a initial stator-field speed and setting a counter of synchronization, (B) measures a speed of a rotor of the motor, (C) compares the speed of the rotor with the stator-field sp... | 10/12/2004 |
| 6750622 | Motor controller system for battery-powered motors A motor controller system (15a) for dc power source motors (10) which includes a sensor device (16) that operates to measure and generate a voltage signal from the motor current and the rate of change of said current, and a programmable i... | 06/15/2004 |
| 6718125 | BLDC motor noise reduction using constant bus current control commutation A motor control system creates a rounding effect on square wave phase currents which results in reduced acoustic noise. The control system includes a voltage source for providing a DC bus current, and an inverter. The inverter has a switching circuit for regulating ... | 04/06/2004 |
| 6696811 | Method for regulating an electrical machine by means of a pulse-width modulation inverter The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can ... | 02/24/2004 |
| 6670785 | Electrical machine drive system and method An electrical machine drive system is simulated with a circuit simulator to model normal operation, fault modes and control strategies for electric motor based vehicles. The electrical machine drive system includes a DC power source model (102), an invert... | 12/30/2003 |
| 6633144 | System and method for measuring parameters of a DC motor field A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing ... | 10/14/2003 |
| 6611116 | Anti-spin control for a separately excited motor drive system Methods and apparatus for controlling performance of electric motors in a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field c... | 08/26/2003 |
| 6580874 | Field current control method in motor In separately excited DC brush motors ML and MR, an armature current control circuit for feeding power to armatures 61 and a field current control circuit for feeding power to a field system 62 form separate systems and are independently controllable exce... | 06/17/2003 |
| 6505127 | Foreign material interference detection apparatus for open/closing members A foreign material interference detection apparatus for an opening/closing member that reduces the calculation load for foreign material interference determination processing. A rotating speed detection sensor detects the rotating speed of a motor and pro... | 01/07/2003 |
| 6465976 | Controlling device for DC motor speed variation A controlling device for a DC motor speed variation including a power supply circuit, a pair of relays and an interlock circuit for alleviating shock arising from the initiation and termination of a DC motor operation. The controlling device protects the ... | 10/15/2002 |
| 6462506 | Electric golf car with low-speed regenerative braking A control system for an electric vehicle, such as a golf car, that includes a plurality of power MOSFETs. The vehicle includes a shunt wound motor including an armature coil and a field coil. One of the MOSFETs is connected in parallel across the armature... | 10/08/2002 |
| 6456784 | Circuit arrangement for starting a DC motor In a circuit arrangement for starting a DC motor comprising at least one field winding, particularly for switching on a DC motor for driving a hydraulic fluid pump for operating hydraulic actuators of a vehicle loading platform system, means are provided ... | 09/24/2002 |
| 6448724 | Apparatus and method for commutation noise reduction A brushless DC motor modifies motor commutation events to reduce noise by providing overlapping activation of the switch being deactivated with the switch being newly activated so that three switches are temporarily activated. The newly activated switch i... | 09/10/2002 |
| 6408130 | Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities The invention relates to an electric drive device with a DC motor (2) comprising a control circuit with an electronic commutator (3). The invention is characterized in that a derivation of a control signal (V_i_ref) is obtained from an induced motor volta... | 06/18/2002 |
| 6374043 | Fully-integrated VCM driver with controlled and predictable Class-AB linear operation A circuit (41) to provide drive voltages to a voice coil motor (VCM) (50) of a hard disk drive (10) has identical high and low side drivers (42, 44, 46, and 48) connected to the VCM (50). Each driver has an output FET (52) selectively connecting the VCM (... | 04/16/2002 |
| 6321031 | Control circuit for a dc motor A control circuit for a direct-current motor driven in a clocked manner, includes an electrolytic capacitor connected in parallel and free-wheeling diode. Spurious radiation is reduced, in that a choke is connected between the positive motor supply voltag... | 11/20/2001 |
| 6172472 | Control system for a two-terminal electric motor connected to a voltage network having two lines A two-terminal motor can be connected to a two-line voltage supply network utilizing a controller in which a control element is in series with the current-measuring component and both are connected to a microcontroller.... | 01/09/2001 |
| 6127791 | Electric drive system and method An integrated transmission is effectively achieved within a series-excited motor by varying the number of winding turns in the field coil in relation to the speed-torque demand on the motor. At low motor speed, all of the field winding is engaged to produ... | 10/03/2000 |
