Powering and control of a brushless DC motor

Electricity: motive power systems – Switched reluctance motor commutation control

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Details

388843, H02P5/06

Patent

active

059053488

ABSTRACT:
A brushless and sensorless DC motor control assembly powers a low torque to inertia ratio device such as a gyroscope or centrifuge. The assembly includes a brushless and sensorless DC motor including a rotor and three phase coils, a motor control integrated circuit, a transistor power bridge connected to the phase coils, and a microprocessor connected between and to the motor control integrated circuit and the transistor power bridge. The microprocessor directly controls the power bridge during ramp up of the motor, and after ramp up disables the power bridge and activates the integrated circuit into a closed loop operating mode until the integrated circuit is synchronized with the motor. The microprocessor also verifies synchronization and then reactivates the power bridge to effectively control which phase of the motor is energized during continued operation. The microprocessor also measures out the time interval for synchronization of the integrated circuit with the motor, and once the motor has been turned off, but while the rotor is still rotating, the microprocessor verifies the synchronization before reactivating the power bridge.

REFERENCES:
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patent: 4700117 (1987-10-01), Giebeler et al.
patent: 4734634 (1988-03-01), Kito et al.
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patent: 4876491 (1989-10-01), Squires et al.
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patent: 5206567 (1993-04-01), Sakurai et al.
patent: 5223772 (1993-06-01), Carobolante
patent: 5365153 (1994-11-01), Fujita et al.
Micro Linear "Sensorless Spindle Motor Controller" brochure, for ML4411/ML4411A, Mar. 1993.

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