Patent
Semiconductor circuit for speed control of electric motors
TLDR
In this paper, a digital control loop is provided in which analog signals supplied by a tachometer driven by an electric motor are digitally evaluated, that is are compared with a reference value existing in digital form, and a deviation from the reference is employed for controlling the adjustment of an element, a thyristor preferably a triac, by way of an adjusting value generator which is likewise designed as a digital circuit.Abstract:
A digital control loop is provided in which analog signals supplied by a tachometer, driven by an electric motor, are digitally evaluated, that is are compared with a reference value existing in digital form, and a deviation from the reference is employed for controlling the adjustment of an element, a thyristor preferably a triac, by way of an adjusting value generator which is likewise designed as a digital circuit. The speed control regulator can be designed both with an integral control behavior, and a differential control behavior, as well as being designed with a proportional control behavior and combinations thereof.read more
Citations
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Variable speed trigger switch
TL;DR: A variable speed trigger switch particularly adapted for use with electric power tools such as drill heads is described in this article, which employs an electronic motor speed control circuit which provides a combination of open loop and closed loop motor control.
Patent
Method and apparatus for maximizing utilization of an electric motor under load
TL;DR: In this article, an electronic device is used to calculate the actual torque being produced by an electric motor at any instant in time and comparing this value of torque ratiometrically either with the maximum (peak) torque that the motor could produce under the line voltage available at that instant or with rated motor torque, thus giving an indication of whether the motor is approaching stall or is under utilized or over utilized.
Patent
Controller with two modes of braking induction motors
TL;DR: In this article, a ramp generator is used to develop different segments of a ramp required for different modes of operation of a motor, and a curve-shaping circuit succeeding the ramp generator gradually changes the slope at the very ends of a selected segment of the ramp.
Patent
Motor speed control system
Noriyuki Yoshida,Asai Yoshimi +1 more
TL;DR: In this article, a motor speed control system consisting of a digital control circuit for working out and storing digital control signals in response to digital speed detection signals representing detected actual motor speeds and digital speed command signals representing commanded nominal motor speeds is presented.
Patent
Control device for controlling motor speed without hunting
Hiraku Sonobe,Ken Miyagi +1 more
TL;DR: In this article, a control device for maintaining a constant driving speed in various rotational objects such as a photosensitive drum, etc for an electrophotographic reproduction apparatus is presented.
References
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Journal ArticleDOI
A Microprocessor Speed Control System
A. K. Lin,W. W. Koepsel +1 more
TL;DR: An approach using digital techniques to control the speed of a chopper-fed D.C. motor using random logic circuits and an Intel 8080 microcomputer offers overall advantages in performance, price, flexibility, reliability and power requirements.
Patent
Digital firing control for a converter
TL;DR: In this article, a digital firing control for a three-phase full-wave silicon controlled rectifier converter is presented, where an error signal in digital form representing a desired change in firing angle which is a function of the difference between the current being supplied by the converter and a desired current, is utilized to advance or retard the firing angle of the SCR's as required to eliminate the error.
Patent
Motor drive control arrangements
TL;DR: A motor drive system for driving a motor according to a predetermined motor speed curve in which a predetermined count of pulses of constant time increment is utilized to produce an output signal characteristic of an increment of motor movement is described in this article.
Journal ArticleDOI
Digital Speed Control of a DC Motor With Phase-Locked Loop Regulation
Bimal K. Bose,Kenneth J. Jentzen +1 more
TL;DR: In this paper, the authors describe a digital speed control method of a rectifier-fed separately excited dc motor incorporating phase-locked loop technique, the converter uses cosine-wave crossing method, the digital version of which is generated by programming a set of read-only-memories (ROM).
Patent
Adaptive control circuit for a stepping motor
TL;DR: In this paper, an adaptive control circuit for a stepping motor in which each motor displacement from a present position to a target position is monitored and the proportion of acceleration signals to deceleration signal is modified as necessary to obtain minimal elapsed time during motor movement is presented.