G - Physics – 05 – B
Patent
G - Physics
05
B
341/107, 318/25
G05B 11/28 (2006.01) G05B 15/00 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1196373
- 27 - HIGH TORQUE SERVO POSITIONER USING 3 PHASE VARIABLE FREQUENCY CONSTANT TORQUE CONTROLLER ABSTRACT OF THE DISCLOSURE 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 con- verting 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 correspond- ing 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.
424576
Robertson John W. Jr.
Smith James M.
Babcock & Wilcox Company The
Ridout & Maybee Llp
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