Electricity: motor control systems – Closed loop speed control system for dc motor with commutator
Patent
1993-10-21
1999-01-19
Cabeca, John W.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
388809, 318632, 323282, H02P 730
Patent
active
058623019
ABSTRACT:
A motor control circuit, including a filter amplifier which includes a clamping circuit to limit the maximum voltage of the filter amplifier. The filter amplifier is clamped to essentially the same level as the following error amplifier, which drives the power transistor which drives the motor. Thus, the requisite control voltage is normally present anyway (since this voltage is used to limit the amount of maximum current in the motor). Since the corresponding level of current is selected to ensure adequate current during start up, this signal is therefore appropriate to limit the output voltage of the filter amplifier. This improvement adds very little circuit complexity, and reduces the settling time of the motor controller at startup.
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Cabeca John W.
Galanthay Theodore E.
Jorgenson Lisa K.
Regan Christopher F.
SGS-Thomson Microelectronics Inc.
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