Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Patent
1997-10-23
1999-10-05
Masih, Karen
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
388806, 318254, 318138, 318439, H02P 506
Patent
active
059637064
ABSTRACT:
The motor control system is operable with multi-phase bipolar parallel winding brushless DC motor. The motor control system includes multi-phase bipolar H-bridge circuits which change current flow direction as the output signal from motor encoder changes. The motor control system is responsive to the speed control circuit to control speed and to the fault detection circuit to give maximum safety and control. The motor control system provides controlled phase signal to individually enable each phase of the stator windings to selectively control the speed of the motor. The motor control system also has a conventional pulse width modulation driver for providing power to the motor. The motor control system of the present invention utilizes both modes to fully utilize the motor's capabilities and at the same time saves power and reduces loading in each of the H-bridges driving stator windings.
REFERENCES:
patent: 4088108 (1978-05-01), Hager
patent: 4882524 (1989-11-01), Lee
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