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7573214 |
Method and apparatus for spindle motor control
Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In...
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7529608 |
Vehicle drive control device
A drive control device is provided with a determining section and a voltage increasing section. The determining section determines if the actual acceleration is deficient in comparison with the...
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7068923 |
Speed control apparatus of motor
A speed control apparatus includes a speed control part 12 for generating a source current command based on a difference between a speed command of a motor 4 and speed detection in which 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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6977477 |
Systems, apparatus, and methods for motor control
Systems and methods are provided through which the current to a spindle motor of the recording medium of a mass storage device is modulated to avoid anomalies in the operation of mass storage...
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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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6328136 |
Drive machine for elevators with drive sheave position detector
A drive machine for elevators includes a rotatable drive sheave over which a main cable for hanging an elevator cage is wound, a stationary shaft for supporting rotation of the drive sheave and...
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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...
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6262546 |
Variable threshold motor commutation pulse detection circuit
An improved motor commutation pulse detection circuit for comparing a filtered motor current signal to a threshold value, where the circuit is responsive to the actual or expected amplitude of the...
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5598081 |
Vector control method for controlling a rotor speed of an induction motor
A vector control method is provided for controlling a rotor speed of an induction motor by an inverter which provides an AC current of varying frequency to the induction motor, and a vector...
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5539290 |
Automatic venting system for a vehicle with obstruction detection utilizing dynamically modified thresholds
A motor control system for controlling operation of an electric motor associated with a motor-operated vent in a vehicle. The system monitors and stores data relating to the operating current and...
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5450520 |
Load current sampling technique
A circuit for sensing the current delivered to a load, or multiple loads, such presented by a polyphase DC motor, without significantly dissipating the energy delivered to the load, has a predriver...
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4999556 |
Pulse width modulator motor control
A pulse width modulation control circuit includes a pulse width modulator which supplies a signal to a power switch tying together a DC signal generator and a motor and various sensing circuit...
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4893067 |
Direct current motor speed control
The motor speed control circuit senses average back EMF as a measure of motor speed. The back EMF charges a capacitor circuit which accumulates charge and develops a voltage indicative of the motor...
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4794310 |
Phase angle control circuit for motors
A control circuit for d-c motors, which are supplied by an a-c supply through phase angle control, and which obtains information regarding the actual current value from a current transformer...
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4792877 |
Electric motor armature current control circuit
An electric motor armature current control circuit includes an electric motor with an armature in series with a protective device comprising a pair of polymer PTC elements connected in electrical...
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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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4673852 |
Device for the electric low-voltage driving of a rotatable mass having high inertia and a motor which is part of said device
An electric device for driving a rotatable mass having a high inertia, said device comprising an electric motor supplied with power by a low-voltage dc source through an electronic energy converter...
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4669025 |
Semiconductor junction temperature emulator
The present device includes a resistor network wherein the values of the resistors are chosen such that the heat generated by current passing through the resistors will be substantially equal to...
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4639652 |
Control system for robot manipulator
A control system for an multi-articulation robot manipulator in which an electric current used to drive the robot manipulator is detected and compared with a predetermined level band near the...
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4622779 |
Method and apparatus for speed control of a grinder
A signal representative of the mass moment of inertia of a grinding wheel and its drive motor is integrated for a fixed time interval during start-up of the motor beginning when the motor speed or...
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4605885 |
Method of controlling rotation speed of motor
A method of controlling the rotation speed of a motor to maintain it at a desired value, comprising a step of obtaining a deviation between the detected rotation speed and the desired value, and a...
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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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4514668 |
D.C. Motor driving circuit
A D.C. motor driving circuit comprises a first transistor circuit comprising an initial stage transistor and a terminal stage transistor respectively connected in Darlington pairs, for supplying a...
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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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4511829 |
Direct current control in inductive loads
A DC current control is provided for inductive loads which achieves high energy efficiency even though the supply voltage may be subject to considerable variations. The inductive load may be a DC...
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4503370 |
Electronic clutch for electric tools of selectable speed
An electronic clutch for a multispeed electric tool includes a voltage sensor having a D.C. voltage output proportional to the current absorbed by the tool's motor and dependent on the motor...
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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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4490657 |
Automatic torque taper circuit
A dc motor drive includes a current limit circuit which produces a current limit signal that inhibits motor current to its commutation limit over a wide speed range. The current limit circuit...
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4489258 |
Propulsion system for vehicles with a d-c machine
A propulsion system for vehicles, includes a d-c machine, an armature current control element connected to the d-c machine, an alternating member having an output side connected to the armature...
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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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4473783 |
Motor control circuit
A current limiting circuit, for a serial commutator motor, that monitors the flow of current through resistances chosen to model the motor, rather than the noisy flow of current through the motor...
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4468724 |
Method and apparatus for controlling load current
A load DC motor is supplied with a DC current through a converter principally consisting of thyristors controlled by an ON-state control signal. The load current is detected both as to the mean...
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4458186 |
Transistor control device for power transistor chopper
A transistor control device in a power transistor chopper is arranged to charge a capacitor for feeding a base current to the chopper transistor with electrical energy stored in an impedance of a...
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4454455 |
Fault responsive means for changing control sequence of a multiple-bridge electric power converter
In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by means of several phase-controlled rectifying bridges having serially...
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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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4394724 |
Propulsion motor control apparatus and method
A vehicle propulsion motor control apparatus includes a motor current regulating chopper apparatus and a free wheeling diode in the motor circuit. It is desired that the chopper apparatus not be...
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4393340 |
Motor speed control device
A motor speed control device comprises means for generating pulse output corresponding to the revolution speed of the motor, means for generating saw-tooth wave output in synchronization with the...
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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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4295081 |
Load actuating servomechanism with resonance equalization
Load actuating servomechanism apparatus includes dynamic regeneration to equalize and overcome a frequency-varying load/load drive train mechanical resonance. The drive circuitry comprises a per se...
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4234835 |
Speed control apparatus for DC motor
Speed control apparatus for DC motor comprising a current mirror circuit including a first transistor 11 and second transistors 12-14 with their bases connected in common, the collectors of the...
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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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4215298 |
Servomechanism rate control system with compensation for motor-tachometer resonance
A rate-control servomechanism includes a load driving motor and a tachometer mounted on the motor shaft to produce a feedback signal hich corresponds to the rotational speed of the motor. An...
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4182979 |
D-C. electric torquing system
An electric torquing device comprises a d-c. motor for producing an output torque that varies in proportion to variations in the armature current, a power source for supplying d-c. current to the...
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4172233 |
Electric vehicle traction motor control
An electric vehicle traction motor control circuit includes a main thyristor in series with the motor armature. A second thyristor is connected in series with a commutating capacitor across the...
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4152632 |
D.C. motor speed control apparatus having both armature current rate control and zero current deadtime optimized
A speed control system is disclosed for a direct current motor drive energized by a thyristor armature supply. Voltage regulation for the thyristor supply is through a parallel current controller...
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4121141 |
D.C. motor speed control circuitry
A closed loop D.C. motor speed control circuit compares tachometer feed-back signals proportional to the D.C. motor speed with a voltage reference representing the desired motor speed and generates...
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4119801 |
Mode switching and voltage regulator circuitry for a telephone answering device
In a telephone answering device, a bistable circuit employing a single operational amplifier is used for mode switching. The bistable circuit uses feedback resistors from the operational amplifier...
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4037145 |
Multiple frequency chopper control
A method and control system for minimizing peak current levels in a direct current traction motor drive system in which the traction motor is powered by periodic current pulses metered from a...
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