Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Patent
1984-08-29
1986-07-01
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
318138, 318139, 318254, 318439, H02P 116
Patent
active
045982406
ABSTRACT:
A method and system for providing assured start-up of a multi-pole permanent magnet electric motor from an at rest position. A vane is mounted on the rotational axis of the motor for rotation therewith. The vane includes a plurality of radially projecting portions each of which is maintained in a fixed angular relationship with a different one of the poles of the motor. A first and second pair of sensors are mounted in a fixed angular relationship with the stator of the motor, the second pair of sensors being spaced further apart than the first pair. The sensors generate a signal when one of the protecting portions of the vane passes through them. A control circuit receives input selectively from either the first sensor pair, under normal motor operation, or from the second pair of sensors when the motor is starting. The control circuit controls the direction of current flow through the motor in response to signals from the selected pair of sensors. When the motor is starting from an at rest position, The control circuit energizes the motor to turn in a predetermined direction. If the motor turns in the opposite direction, the current through the motor is reversed after the motor has turned a predetermined angular distance. Normal operation then begins.
REFERENCES:
patent: 4296650 (1971-10-01), Kalns
patent: 4316132 (1982-02-01), Geppert
patent: 4355255 (1982-10-01), Herr et al.
patent: 4450517 (1984-05-01), Sundstrom
patent: 4500824 (1985-02-01), Miller
patent: 4507599 (1985-03-01), Guerin
patent: 4532460 (1985-07-01), Gale et al.
patent: 4549121 (1985-10-01), Gale
"Hall Effect Devices and Their Applications", Electronics Industry, May 1979, pp. 23-27.
Gale Allan R.
Gritter David J.
Eaton Corporation
Ro Bentsu
Shoop Jr. William M.
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