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| Number | Title | Issue Date |
| 7388347 | Method and inverter for controlling a direct current motor A three-phase direct-current motor is controlled by cyclically repeating three first switching states. In each of the three first switching states, one of the three phases of the direct-current motor is periodically switched over between a first and a second input v... | 06/17/2008 |
| 7372233 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a ... | 05/13/2008 |
| 7239061 | Switching pattern AC induction motor Both the stator core and the rotor core of a switching pattern AC induction motor are fabricated by soft magnetic material laminations or ferrite material, etc., both of which have corresponding frequency characteristic. The rotor is a squirrel cage rotor. Switching... | 07/03/2007 |
| 7218075 | Electronic circuit for starting a single phase induction motor An electronic circuit for starting a single phase induction motor, of the type containing a rotor and a stator with at least one running coil (B1) and one starting coil (B2), for operating jointly with an alternating current source (F), comprising: a t... | 05/15/2007 |
| 7078872 | System and method for conditioning a signal A method of conditioning a signal being communicated between a system to be controlled and a controller may include monitoring an actual output signal and conditioning the actual output signal. The method also includes determining the difference between the actual o... | 07/18/2006 |
| 6952088 | PSC motor system for use in HVAC applications with improved start-up A motor control system for use in heating, ventilation and air conditioning applications including a blower and a motor coupled to drive the blower, an inverter coupled to provide energization to the motor, a relay capable of coupling the motor to the output of the ... | 10/04/2005 |
| 6828744 | Motor torque control apparatus and method A motor torque control apparatus and method are disclosed. By adding the value of the compensation voltage which is obtained by proportionally integrating a difference value between the predetermined reference magnetic flux component current value and the actually m... | 12/07/2004 |
| 6777906 | Method of controlling induction motor A control device for an induction motor controlling torque generation of the induction motor with high precision includes a rotation speed detector which detects the rotation speed of the induction motor, a current detector which detects a primary current of the ind... | 08/17/2004 |
| 6756763 | Sensorless induction motor control A method for controlling an induction motor using an equivalent circuit model, the equivalent circuit having a real component and an imaginary component, is disclosed. The method instead of measuring a plurality of induction motor parameters, the real and the imagin... | 06/29/2004 |
| 6331760 | Capacitive induction motor and method An improved induction motor having at least one capacitive element electrically connected in parallel with and tapped to each phase of a delta- or wye-wound stator winding such that the capacitive elements are alternately charged or discharged during oper... | 12/18/2001 |
| 6104177 | Three-phase power controller with interrupt-controlled phase-gating control The three-phase power controller is provided which has interrupt-controlled phase-gating control with a simple, cost-effective design. The power controller uses of a single microcontroller with only one or two interrupt inputs. This is made possible by fo... | 08/15/2000 |
| 5880572 | Variable-speed control method and apparatus for AC motor A variable-speed control apparatus computes the leakage inductance of an AC motor, correctly compensates the leakage inductance, and controls the variable speed of the AC motor. The variable-speed control apparatus has an AC signal generation circuit for ... | 03/09/1999 |
| 5852349 | Driver circuit apparatus for driving a three-phase motor with a single magneto-sensitive device An integrated circuit for driving a three-phase motor in response to a single signal of the three-phase signals to be applied to stator coils of the motor. The circuit comprises a first amplifier for amplifying the single signal on the basis of a first in... | 12/22/1998 |
| 5847534 | Control system for electric vehicle The control system is constructed so that an inverter output frequency command is increased/decreased based on a frequency-to-time rate-of-change command, and the frequency-to-time rate-of-change command is controlled with a current control system. Furthe... | 12/08/1998 |
| 5847535 | Active electronic damping for step motor Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, without the use of an accelerometer or other external feedback device, includes a circuit for detecting respective instantaneous terminal vol... | 12/08/1998 |
| 5847524 | Constant speed control for a motor A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating assembly to rotate. A position sensing circuit provides a p... | 12/08/1998 |
| 5838124 | Systems and methods for braking of actuator and brushless DC motor therein A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals su... | 11/17/1998 |
| 5831405 | High precision fan control/alarm circuit A motor speed control circuit includes a temperature sensor providing a first voltage output which is proportional to the temperature and a control voltage generator having an internal voltage reference receiving the first output as an input. The control ... | 11/03/1998 |
| 5821725 | Electric current compensation circuit for brushless motors for reducing ripples in output torques during phase change An electric current compensation circuit for use with a multiple-phase burshless motor to reduce ripples in the output torque is disclosed. It contains a plurality of electric current compensation loops each for a respective phase winding and each of the ... | 10/13/1998 |
| 5821714 | Improvements in and relating to motors A commutation control strategy for eliminating torque ripple and noise from a brushless motor which has a plurality of motor phases connected in a bridge, each phase having a top switching device provided between a phase winding and a positive voltage sup... | 10/13/1998 |
| 5818187 | Motor and control for windshield wiper system The invention concerns an improved system for windshield wipers in vehicles. An induction motor is used, in which speed is accurately controlled by controlling frequency of power supplied to the motor. The induction motor may be of the consequent-pole typ... | 10/06/1998 |
| 5818180 | Voice coil motor feedback control circuit A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop prevents the BEMF from driving a voltage on the voice coi... | 10/06/1998 |
| 5814962 | Servo controller A servo controller for servo-controlling an operative device, the servo controller is provided with an actuator having a motor for actuating the operative device; a sensor for detecting an operational state of the operative device; a comparator for receiv... | 09/29/1998 |
| 5801505 | Disk drive stiction release system A disk drive including firmware for overcoming stiction and breaking free the heads of a disk drive which may adhere to the disk surface when the disk is at rest. Upon start-up of the disk drive, if stiction at the head/disk interface occurs, the voltage ... | 09/01/1998 |
| 5786681 | Active phase coil inductance sensing A method and circuit are disclosed for commutating a conduction cycle of a motor phase of a switched reluctance motor having a rotor portion thereof. The circuit includes a first switching device and a second switching device connected in series with a ph... | 07/28/1998 |
| 5783924 | Drive system comprising a motor, control means for controlling the motor, apparatus comprising the drive system, and method of controlling the motor The drive system (210) comprises an electronically commutated motor (220) having three windings (225, 226 and 227). The motor (220) is energized by an energizing circuit (270). The energizing means (270) is controlled by three Hall elements (241, 242 and ... | 07/21/1998 |
| 5773944 | Electric machine control system including a torque smoothing device An electric machine control system includes a torque smoothing device including a torque monitoring device connected to the electric machine and supplying torque signals. A smoothing processor receives the torque signals and receives at least one torque r... | 06/30/1998 |
| 5767654 | Apparatus and method for detecting motor position in PWM operation of a polyphase DC motor A pulse width modulated (PWM) motor drive with back EMF monitoring of the floating phase of a polyphase motor is arranged so that zero crossings of the back EMF can be read without interference by PWM switching. A measure is taken of an interval between t... | 06/16/1998 |
| 5761375 | Brushless motor speed detection device A delay signal rising after the passage of a predetermined time from the rising or falling of a position signal is formed by means of a delay circuit. While an offset circuit is used for sequentially monitoring the size relation between an induced electro... | 06/02/1998 |
| 5698960 | Motor servo system A motor servo system includes a microcomputer which obtains FG period data in response to an FG signal outputted from a capstan motor, and calculates rotation unevenness associate data D1 by totalizing (a hundred) absolute values of differences between ea... | 12/16/1997 |
| 5652825 | Power supply for low-voltage DC motor An improved power supply for converting any of various standard national AC network voltages to low-voltage DC power suitable for driving a 1 or 2-watt device, such as a fan, features a semiconductor control circuit (18, FET 46) which chops each half-wave... | 07/29/1997 |
| 5587642 | Fan motor brown-out control algorithm An air conditioner having a fan motor brown-out control algorithm for increasing the air conditioner fan speed upon sensing a brown-out under-voltage condition is provided. The air conditioner has a power supply connected to an AC line voltage, a fan moto... | 12/24/1996 |
| 5577155 | Rectifier based motor speed/brake control A motor speed controller for use with dc motors, such as found in model (slot) cars, is provided by a plurality of pairs of oppositely-poled voltage-sensitive threshold conduction devices which are selectively connected so as to be controllably inserted b... | 11/19/1996 |
| 5329560 | AGC circuit with non-linear gain for use in PLL circuit A circuit and method for generating drive signals having a frequency synchronized to a reference frequency signal is disclosed. The circuit includes a PLL that includes a motor, and a circuit for generating a signal having a frequency proportional to the ... | 07/12/1994 |
| 5013990 | Energy conserving electric motor power control method and apparatus An energy conserving device which reduces excess level of alternating current power fed to RUN windings of an a.c. electric induction motor whenever the motor is less than fully loaded. A voltage dropping reactor coupled between an a.c. power source and t... | 05/07/1991 |
| 4983891 | Motor driving apparatus with speed determined chopped drive and constant voltage drive control A motor driving apparatus for driving a motor with a constant voltage by a driving pulse having a predetermined pulse width when the motor is rotated at a high speed, and for chop-driving the motor by using a chopping clock when the motor is rotated at a ... | 01/08/1991 |
| 4878006 | Multi-voltage motor and timer clock A motor having a capacitor in series with its coil permits the motor to operate at a higher voltage or range of voltages over its design voltage. A method determines the correct value of a capacitor to change the design voltage of a motor to a different o... | 10/31/1989 |
| 4751451 | Fan motor control system This invention relates to motor speed control circuits employing capacitors. Two windings of a motor are connected in parallel to a neutral phase of an alternating current source. Each coil of the motor may be connected to the live phase of the source whe... | 06/14/1988 |
| 4745261 | Warming fan A warming fan with a speed reducing device comprises a choke coil which connects with the running inductor of the power set of the warming fan, a diode which is paralleled to the choke coil and a choke coil which is paralleled to the above-mentioned choke... | 05/17/1988 |
| 4670699 | Capacity-movement model AC inductive motor switch-changeover capacity-type speed control circuit A switching arrangement for delivering power to an A. C. induction motor having a running winding and a start winding. A single-pole or double-pole, double-throw switch is provided for reversing current flow in the running winding is provided to reverse t... | 06/02/1987 |
