Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1983-09-29
1985-12-31
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318341, 318317, 318257, G05B 1128
Patent
active
045623937
ABSTRACT:
In a motor control system for a DC motor, a modulation circuit provides a plurality of pulse width modulated signals to control the current applied to the motor. The motor is coupled to a current sensing resistor and a plurality of switches responsive to the pulse width modulated control signals. The output of the current sensing resistor is summed with an input current command to provide an error signal. A modulation circuit which includes a waveform generator generates a plurality of interposed triangular waves adjustably offset by a predetermined amount. The triangular waves are compared to the error signal to provide pulse width modulated control signals which cause a "dither" current to be applied to the motor when there is substantially no input command and currents having substantially decreasing form factors to be applied as the input command increases.
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Blythe Michael P.
Loyzim Robert J.
Dobeck B.
Ip Shik L. P.
Kollmorgen Technologies Corporation
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