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7609018 |
Fan system and control device thereof
A control device of a fan system includes a temperature sensing module, a comparing module and a driving module. The temperature sensing module senses an external temperature and generates a...
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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...
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7027721 |
Temperature-rated variable speed control circuit of an electric fan
An electric fan temperature-rated variable speed control circuit, includes a D.C. current source and fan activation IC. There are, between the current source positive and negative poles serially...
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6717380 |
Method for shifting the instant of commutation for a sensorless and brushless direct-current motor as well as a system for implementing the method
The present invention provides a method for shifting the instant of commutation for a sensorless and brushless direct-current motor ( 1 ), whose stator windings are fed by a multi-phase converter...
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6703803 |
Fan motor driving circuit
A fan motor driving circuit of the present invention comprises a device for detecting a power source voltage and outputting a voltage in proportion to a difference between the power source voltage...
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6518719 |
Power tools with operating speed control circuit
A variable speed power tool may include a speed adjusting device and/or a maximum speed adjusting device for adjusting the operating speed, and a fixed operating speed switch. An operator...
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6424107 |
Apparatus and method for controlling an electric motor
An apparatus ( 10 ) for controlling an electric motor ( 36 ) having a plurality of motor phases includes a motor controller ( 32 ) that controls energization of each phase of the plurality of motor...
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6411572 |
Method and apparatus for efficient measurement of optical pickup sled mechanism parameters
A motor constant K m of a sled mechanism of an optical disc drive is to be measured. To this end, a parameter measurement device 1 for the sled mechanism includes an oscilloscope 8 for...
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6326778 |
Method and apparatus for transmitting speed information and other additional information detected by a sensing device
A method and a sensing device transmit speed information and additional information over a transmission channel. For this purpose, the transmission clock cycle is selected to reflect the speed and...
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6184645 |
Voltage mode drive for control circuit for an actuator using sampled back EMF control
An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first...
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5929579 |
Soft-commutated direct current motor
A method and circuit is disclosed for soft-commutation of a direct current (DC) motor. An attenuation circuit is connected through auxiliary brushes A, A', B and B' to the commutator (16) to drain...
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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...
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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...
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5590236 |
Speed controller or an instrument having a speed controller including detection means for linearly detecting the amount of rotation less than one full rotation of a rotating member
A speed controller includes a drive source, an input device for inputting the driving speed information of the drive source, a driver for driving the drive source on the basis of the driving speed...
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5457374 |
Motor controller for operating an inverter in current-controlled and voltage-controlled modes
A motor controller for brushless motors operates an inverter in a current-controlled mode for low motor speeds and in a voltage-controlled mode for high motor speeds. By switching from the...
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5420486 |
Multiple motors controllers
This invention is for incrementally controlling energizing and de-energizing of at least two electrical motors in which motor armatures are mechanically coupled to a single mechanical member and in...
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5291107 |
Circuit for driving reel motor of videotape recorder
A load driving circuit causes a driving current to flow through a load, such as a reel motor, an audio load or the like through the collector and emitter of a drive transistor. A load voltage which...
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5077509 |
Multiple windings electrical motors controllers
A circuit for recovering electromagnetic energy from multiple windings electrical motor open circuit armature windings when interrupted while contacted through coupled commutator segments by...
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4933614 |
Motor drive control circuit
A blower motor drive control circuit is configured to maintain a fixed value of motor driving current to maintain a constant amount of air supply from an air conditioner regardless of changes in...
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4912386 |
Balanced bridge feedback control system
In a system having a driver, a motor, and a mechanical plant, a multiloop feedback control apparatus for controlling the movement and/or positioning of a mechanical plant, the control apparatus...
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4792735 |
Apparatus for adjusting torque and speed of a dentist handpiece D.C. motor
A D.C. motor control circuit for a dentist's hand drill including a feedback loop to vary the torque of the motor according to the load on the motor while keeping the motor speed constant. Power to...
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RE32674 |
Multiple windings electrical machines
A class of electrical machines for converting between electrical energy and mechanical energy and vice versa is disclosed. Each machine has an integral number of repeatable sections and is...
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4736142 |
Speed control system for electric motor
A speed-control system for an electric motor comprises a circuit for setting a desired motor speed and providing a speed-control signal, a circuit for sensing motor voltage and providing a motor...
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4684858 |
Motor pulse extraction system
An improved system is provided for accurately referencing the revolving motion of electric motors used as positioning devices, and is particularly applicable to the automatic positioning and...
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4675584 |
Control system
A control system capable of improving a disturbance response characteristic, includes a control processing unit and a power converter. The control processing unit includes apparatus for (a)...
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4649327 |
Electric motor control circuit
The motor control circuit is constituted by a current controlling circuit having a first output terminal connected to a source terminal via a resistor, a second output terminal connected to the...
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4641068 |
DC motor driving device
A driving circuit for a DC motor in which the accuracy of the voltage applied to the motor when it is driven with a fixed voltage is improved and the fixed voltage is continuously applied for...
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4605884 |
Control unit
A control unit for a movable member comprises a motor for driving the movable member, a speed detector for detecting a rotating speed of the motor, a reference signal generator, amplifiers of...
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4574226 |
Method and apparatus for controlling an electric motor the rotational speed of which is automatically reduced in no-load idling operation
A method and apparatus for controlling an electric motor, in particular a motor for driving hand tools, saws, and the like, the rotational speed of which is automatically reduced in no-load idling...
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4567409 |
Control circuit for motor
The disclosed motor control circuit includes a speed loop controlling the rotational speed of the rotor of a motor. A phase control loop controls the rotational phase of the rotor, and a voltage...
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4565952 |
Speed controlling device for rolling mills
A device for controlling a speed of rolls of a rolling mill is disclosed which includes means for reducing an amount of drop of the speed of the rolls and a speed restoration time when a work to be...
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4561677 |
Passive seat belt device
A passive seat belt device in which a runner member to which a part of webbing is connected is moved on a rail member by being driven by a driving motor and thereby can assume a seat occupant...
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4513231 |
Control circuit of pulse width modulation inverter
The invention relates to a control circuit of a pulse width modulation inverter, wherein a current control circuit to output a current control signal corresponding to a current command signal is...
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4510423 |
Motor apparatus
A motor apparatus includes a motor, a first circuit for sensing a back electromotive force of the motor to provide a first signal, a second circuit for sensing a rotation speed of the motor to...
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4494057 |
Speed control system for small medical motors
A speed control system for small medical motors. The system comprises a drive voltage regulation circuit, a current detection circuit which generates a detection signal in accordance with motor...
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4476417 |
Control arrangement for a static converter
A control arrangement for a static converter of the type which supplies a DC machine. A pilot signal is produced, the pilot signal being responsive to the actual speed value and the desired current...
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4450392 |
Electronic speed regulator for a d.c. motor
An integrated circuit regulator in which current regulation is effected by means of a current mirror utilizing motor current as an input. The base currents of the transistors of this current mirror...
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4384825 |
Personal sampling pump
A portable battery powered pump providing constant mass flow of air sample through a particular filter or vapor trap in which the pump drive motor speed is controlled by an amplifier having a...
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4362976 |
Driving circuit for DC motor
Disclosed is a DC motor drive circuit adapted to prevent thyristor commutation failure when a thyristor-controlled three-phase full-wave reversible bridge undergoes a transition in operating mode...
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4355268 |
Motor control apparatus
Disclosed is a motor control apparatus which includes a pulse generator for producing a first signal as a pulse signal having a period corresponding to the rotational speed of a motor, a timer for...
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4345189 |
Motor rotation speed control circuit
A rotation speed control circuit is designed to control the rotational speed of a motor at a constant speed, despite variations in both the load and the power supply. A motor (100') and a resistor...
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4338554 |
Automatic gain control apparatus for a motor servo system
When the number of revolutions of a motor, or a motor speed is reduced half, a gain of a frequency-voltage converter is doubled. By taking advantage of this fact, a gain of an error signal...
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4306264 |
Disconnect and overload bypass arrangement for a portable tool
The invention is directed to a disconnect and overload bypass arrangement for a hand-held portable tool equipped with an electric motor supplied from a source of electrical energy and a manually...
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4274036 |
Rotational speed control circuit for a D.C. motor
A rotational speed control circuit for a D.C. motor includes a power transistor with its emitter-collector path connected in series with the D.C. motor and a power supply. A base current of the...
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4272709 |
Circuit for controlling the drive of motor
The present invention is related to a temperature-compensated circuit for controlling the drive of a motor, comprising a differential comparator for comparing a running-speed signal of a motor with...
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4268782 |
Control system for a DC motor
A system for controlling DC motors of the type employing permanent magnets as field poles. The firing phase angle of a thyristor is controlled in response to an error signal representative of an...
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4268224 |
Method of and means for conveying and measuring gases for gas analysis operations
This invention relates to a method of and means for conveying and measuring gases for gas analysis operations by means of a pump, which conveys the gas with constant volume per working cycle. The...
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4233549 |
Speed and torque control for fractional horsepower motors
Power control circuitry for supplying pulses of power from a power source to a fractional horsepower motor with a plurality of power pulses applied to the motor during each half cycle of the power...
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4227127 |
Motor speed control circuit having improved starting characteristics
A motor speed control circuit includes a resistor, a voltage reference circuit, a first voltage comparator, a current mirror circuit for deriving first and second output currents according to the...
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4183312 |
Speed-regulated sewing machine
A sewing machine has a main drive shaft to which is drivingly coupled the output member of a coupling motor unit, the latter including an electric motor having a constantly rotating output shaft, a...
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