Method and apparatus for one wire motor speed and direction decoding
First Claim
1. A motor control system having a bi-directional variable speed motor, a controller for controlling motor operation, and means for supplying the controller electrically encoded motor speed and direction data, the improvement wherein:
- the speed and direction data are electrically encoded on a single alternating voltage signal, said signal having an amplitude parameter dependent on said direction data, and a frequency parameter dependent on said speed data;
the controller includes circuit means for sensing the amplitude parameter of said voltage signal to output a motor direction signal; and
the controller includes circuit means for sensing the frequency parameter of said voltage signal to output a motor speed signal.
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Accused Products
Abstract
A traction motor controller has a motor feedback employing motor-driven encoders producing signals in quadrature having a phase depending on motor direction and frequency according to motor speed. A logic encoder develops a single signal comprising a pulse train having a frequency dependent on motor speed and either of two amplitudes dependent on motor direction. A decoder at the controller has a circuit for producing a pulsed output at a frequency according to the encoded signal to indicate motor speed. Another decoder circuit uses a comparator to discriminate between the two amplitudes. The higher amplitude signal causes comparator output pulses which are converted to a steady state signal by a flip-flop which is clocked by delayed motor speed pulses.
12 Citations
12 Claims
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1. A motor control system having a bi-directional variable speed motor, a controller for controlling motor operation, and means for supplying the controller electrically encoded motor speed and direction data, the improvement wherein:
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the speed and direction data are electrically encoded on a single alternating voltage signal, said signal having an amplitude parameter dependent on said direction data, and a frequency parameter dependent on said speed data; the controller includes circuit means for sensing the amplitude parameter of said voltage signal to output a motor direction signal; and the controller includes circuit means for sensing the frequency parameter of said voltage signal to output a motor speed signal. - View Dependent Claims (2, 3)
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4. In a motor control system having a bi-directional variable speed motor, a controller for controlling the motor operation, a feedback system for supplying motor speed and direction data to the controller comprising:
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means responsive to the motor for generating a single alternating voltage signal encoding motor speed as the frequency of said signal and motor direction as the amplitude of said signal; and the controller including first and second circuits coupled to the voltage signal, said first circuit being responsive to the amplitude of the signal for determining motor direction, and the second circuit being responsive to the frequency of the signal for determining motor speed. - View Dependent Claims (5, 6, 7, 8)
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9. In a motor control system having a bi-directional variable speed motor, a controller for controlling motor operation, and means for supplying motor speed and direction data to the controller, a method of communicating data comprising the steps of:
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encoding on a single electrical signal an amplitude parameter which contains the direction data and a frequency parameter which contains the speed data; transmitting the signal to the controller; and decoding the transmitted signal by developing a speed signal from the frequency parameter, and developing a direction signal from the amplitude parameter. - View Dependent Claims (10, 11, 12)
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Specification