High torque servo positioner using 3 phase variable frequency co

Details High torque servo positioner using 3 phase variable frequency co High torque servo positioner using 3 phase variable frequency co

1982-04-22

1984-06-26

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318811, 318341, 318810, G05B 1128

Patent

active

044568657

ABSTRACT:
A controller for an induction motor used as a servo positioner comprises a position control module including a microprocessor with memory for generating a plurality of pulse width modulated waveforms. The module includes an analog to digital converter for converting one of four analog signals into digital signals readable by the microprocessor. The analog signals correspond to a gain signal, a feedback signal, a set point signal and a dead band signal. The module also receives digital signals for programming purposes. The microprocessor is programmed to initialize conditions and convert the analog signals.
The module is included in a three phase drive controller which has drivers connected to the module for receiving the waveforms and generating corresponding AC inputs to the three phase motor. An overcurrent detector is provided for sensing overcurrents in the AC signals and for generating an interrupt signal which is applied to the module for interrupting the function thereof. The module according to its programming can be placed in one of three modes for interface with a broad spectrum of automatic control systems. The modes include automatic-analog, automatic-pulse, and closed-contact controls.

REFERENCES:
patent: 3387205 (1968-06-01), Tesdall
patent: 4099109 (1978-07-01), Abbondanti
patent: 4201936 (1980-05-01), Roumanis
patent: 4337429 (1982-06-01), Stuart
patent: 4387421 (1983-06-01), Zach et al.
patent: 4409534 (1983-10-01), Bose

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