Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1989-07-03
1990-08-28
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318723, H02F 528
Patent
active
049528602
ABSTRACT:
A control system for a motor is disclosed in which the position of a magnetic pole of the rotor of the motor is detected to produce a position signal, a multi-phase rectangular wave signal is produced by an oscillation circuit, and the frequency of the position signal is multiplied to obtain a multiple frequency signal. A stepwise wave changing stepwisely, with the same frequency as the multiple frequency, is generated. A signal corresponding to the position signal or a phase difference signal representing a phase difference between the multi-phase rectangular wave signal and the position signal is selectively applied as a drive signal to the motor by a drive signal switching circuit. A first signal is produced before the stepwise wave reaches a predetermined level and a second signal is produced when the predetermined level is reached. The drive signal switching circuit produces a signal corresponding to the position signal in response to the first signal thereby to drive the motor in brushless mode, and a signal corresponding to the phase difference signal in response to the second signal thereby to drive the motor in sync mode.
REFERENCES:
patent: 3783357 (1974-01-01), Ichiyanage
patent: 4085355 (1978-04-01), Fradella
patent: 4132931 (1979-01-01), Okuyama et al.
patent: 4855652 (1989-08-01), Yamashita et al.
Cabeca John W.
Shoop Jr. William M.
Yamamoto Electric Corporation
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