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| Number | Title | Issue Date |
| 7368891 | Charge control method of capacitor in thyristor converter Charging time of a capacitor is shortened while avoiding erroneous firing due to distortion of a power supply voltage and sustaining an inrush current at a constant level. In the charge control method of a capacitor in a thyristor converter comprising a thyristor fo... | 05/06/2008 |
| 7357031 | Precision sensor assembly for rotating members in a machine tool A precision sensor assembly for rotating members in a machine tool comprises a rotor unit (16) rigidly fixed to a rotor portion (2a) of the machine tool and including a sensor (5) for detecting vibrations produced by the operation of the ... | 04/15/2008 |
| 7359628 | Control device for an electric motor The invention relates to a drive device for an electric motor, in particular for a brushless DC motor in an electrical tool, which is powered by a rechargeable battery. The drive device has at least one power semiconductor, in particular for controllable application... | 04/15/2008 |
| 7308192 | Motor drive control with a single current sensor using space vector technique A drive system for a three phase brushless AC motor that is operative to optimize a transistor switching pattern to improve power output while allowing current measurement in all of the phases using a single sensor. This is achieved by defining a voltage demand vect... | 12/11/2007 |
| 7298103 | Control and motor arrangement for use in model train A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arragement further includes a command control interface configured to receive co... | 11/20/2007 |
| 7292004 | Motor driving apparatus A motor driving apparatus for driving a motor includes a single-phase rectifier circuit having an input connected to a single-phase AC power supply, an inverter circuit that is connected to the single-phase rectifier circuit and applies a current and a voltage to th... | 11/06/2007 |
| 7279864 | Control unit for driving a regulating transistor of a fan arrangement A control unit for driving a regulating transistor (2) of a fan arrangement, in which the regulating transistor (2) is connected in series with an electronically commutated fan (1), having control means (5, 6, R1, R2) for th... | 10/09/2007 |
| 7260319 | Abnormality monitoring device for motor control system An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device ca... | 08/21/2007 |
| 7245106 | Controller of pulse width modulation signal-driven device, and method of reducing noise of the device A controller of a pulse width modulation signal-driven device, includes: an instruction input of operating the pulse width modulation signal-driven device; a control section generating a control clock which operates the pulse width modulation signal-driven device; a... | 07/17/2007 |
| 7231139 | Digital noise reduction for motors A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a sche... | 06/12/2007 |
| 7193377 | System and method for controlling motor speed using a biased pulse width modulated drive signal A motor drive circuit includes a switching circuit having an input node that receives a drive signal and a control node that receives a control signal. The switching circuit couples the input node to an output node responsive to the control signal. A bias element re... | 03/20/2007 |
| 7158865 | Current driver employing pulse-width modulation A current driver capable of generating a controlled current in the form of a pulse-width modulation (PWM) signal suitable for controlling an electronic device such as a solenoid is disclosed. The current driver has a feedback loop incorporating a dual-slope integrat... | 01/02/2007 |
| 7129610 | Commutator for an electric motor A commutator includes a support ring and a plurality of conducting segments arranged over a circumference of the support ring. Some of the conducting segments have an electrically insulating portion. The commutator is employed with a device that measures rotation of... | 10/31/2006 |
| 7092623 | Method and apparatus to achieve accurate fan tachometer with programmable look-up table A system and method for measuring the speed of a fan is presented. The duty cycle of a pulse width modulated (PWM) power signal may control speed of the fan. The fan may generate tachometer pulses used for monitoring RPM of the fan. Very low frequency test pulses ma... | 08/15/2006 |
| 7066028 | Acoustic sensor for monitoring machining processes in machining tools An acoustic sensor for monitoring machining processes in machining tools, e.g. grinding machines, includes a stationary unit, or stator (21) and a rotating unit, or rotor (23), the latter being coupled, for instance, to the grinding wheel and rotating ... | 06/27/2006 |
| 7038420 | Method of regulating an electric motor and corresponding electric motor A method of regulating an electric motor, regulation being implemented with a loop of gain less than unity as a function of a divergence between a setpoint signal for an operating parameter of the motor and a measured value of the same operating parameter of the ele... | 05/02/2006 |
| 7000285 | Control circuitry for enabling drive system for vacuum cleaner A self-propelled appliance comprises a base, electric motor mounting the base, a handle moveably depending from the base and a drive wheel mounted in the base and operatively connected to the motor. The control circuits comprising an enable switch and a base switch ... | 02/21/2006 |
| 6982531 | Driving circuit for switches of direct current fan motor A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven by a first pulse width modulation signal and a second pulse width mo... | 01/03/2006 |
| 6836614 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to ro... | 12/28/2004 |
| 6810202 | Apparatus for controlling rotational speed of motor An apparatus for controlling a rotational speed of a motor, coupled to a sensing unit capable of outputting a sensing signal. The apparatus includes a controlling unit, coupled to the sensing unit, for outputting a controlling signal according to the sensing signal ... | 10/26/2004 |
| 6775469 | Method of controlling an electronically commutatable motor An electronically commutatable motor having field windings activatable in sequence with a commutation frequency via semiconductor output stages using control signals connectable and disconnectable from a direct voltage supply, the control signals being clocked using... | 08/10/2004 |
| 6700339 | Circuit for regulating a power supply voltage Disclosed is a circuit for regulating a power supply. In one embodiment, the circuit includes a signal generator for generating a square wave signal that varies in magnitude between a first voltage and a second voltage, and a voltage regulation circuit. A... | 03/02/2004 |
| 6671459 | DC motor control method and apparatus A method for maintaining a target speed of a DC motor includes the steps of obtaining a feedback signal from the motor corresponding to motor speed, measuring an actual time for a predetermined number of feedback pulses to be received, comparing the actua... | 12/30/2003 |
| 6650074 | Fan speed controller with conditioned tachometer signal The speed of a fan motor is controlled by varying a DC voltage to the fan motor. A series pass transistor is used to vary the DC voltage to the fan motor. A power management controller sets the fan motor speed by outputting pulses to a pulse-to-DC voltage... | 11/18/2003 |
| 6617818 | Voltage independent PWM base frequency generating method A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level de... | 09/09/2003 |
| 6580235 | Electric motor with two modes of power supply switching An electronically switched motor includes a stator-rotor assembly fitted with three-phase driving windings, a series of switches for powering the windings, and a control circuit suitable for regulating a speed of the motor as a function of a reference spe... | 06/17/2003 |
| 6534948 | Motor driving circuit, a method for driving a motor, and a semiconductor integrated circuit device A motor driving system is disclosed. The circuit includes a power converter for supplying a brushless motor having a permanent magnetic rotor with pulse-width modulation controlled driving power, a magnetic-pole position detector for detecting a magnetic-... | 03/18/2003 |
| 6424799 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck and has associated therewith a degree of looseness which must be taken up before torque from the motor is a... | 07/23/2002 |
| 6424113 | Method and apparatus for pulse width modulation A pulse width modulation circuit (10) for a motor controller is operated by generating an offset voltage and adding the offset voltage to a carrier timing signal to form an offset carrier timing signal. The operation of each of the phases of the motor is ... | 07/23/2002 |
| 6385395 | Fan motor with its speed controlled by operating periods of a pulse wave A fan motor whose speed is controlled by an operating period of pulse waves includes first and second rectifying circuits, a voltage comparison circuit, and a differential amplifier. A pulse wave is inputted into the first rectifying circuit, an actual sp... | 05/07/2002 |
| 6327424 | Method of and circuit for operating a motor using power transistors The pulse duration of voltage pulses for the control of a motor winding through power transistors is effected by writing data from a microprocessor or CPU to a module having intermediate register into which that data is written, the module then reading th... | 12/04/2001 |
| 6091887 | Method and apparatus for controlling a physical parameter The invention relates to a method for adjusting a real value (actual value) of a physical quantity to a preset value (target value) with the following steps: (a) the difference between the target value and the actual value (referred to below as the contro... | 07/18/2000 |
| 6055359 | DC motor drive control with improved current sensing A PWM DC motor control circuit having improved current sensing. A power switching device controls the DC motor in a common drain connection, whereby armature current sensing is achieved at the negative side of the power switching device. The control for t... | 04/25/2000 |
| 6002225 | Method for the control of a motor A method of breaking a motor includes the step of applying a pulse width modulated signal to the winding of the motor. A switching voltage is used to intermittently reverse the poles of the motor for selected time periods. The time periods are separated b... | 12/14/1999 |
| 5986426 | Adaptive pulse width modulated motor control A motor control method and apparatus for spindle motor control and for voice coil motor (VCM) control in a direct access storage device (DASD). Characteristics of the pulse width modulation (PWM) waveform are adapted to allow tradeoffs to be made between ... | 11/16/1999 |
| 5933573 | Method of controlling an electric motor and apparatus for carrying out the method An electric motor (12) is supplied with current (imot) via a semiconductor switch (14). During operation, the semiconductor switch (14) is driven by a Pulse Width Modulation (PWM) unit 15 using a pulse-formed signal (32). For regulation of the ... | 08/03/1999 |
| 5917296 | Optimum motor speed control system The method for controlling a motor driving a load holds the speed of the output shaft of the motor substantially constant as the torque imposed upon the shaft by the load varies, then regulates the rate of change of the output torque delivered by the moto... | 06/29/1999 |
| 5859511 | Motor with input-controlled high side driver A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5802248 | Multi-speed motor Control circuitry for a multi-speed, rotational, direct current motor can include a means to select one of a plurality of discrete circuits to select a desired speed of the motor, each circuit being activated by a separate analog switch which can complete... | 09/01/1998 |
| 5798573 | Split power supply A power supply circuit for a control circuit of a motor having an armature, includes a first power supply branch having a series combination of a first resistor, a first diode and a Zener diode connected between a supply of power and a reference potential... | 08/25/1998 |
