Three-phase sine wave signal synthesizing circuit and brushless

Details Three-phase sine wave signal synthesizing circuit and brushless Three-phase sine wave signal synthesizing circuit and brushless

1992-06-17

1993-08-17

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 700

Patent

active

052372472

ABSTRACT:
A three-phase sine wave signal synthesizing circuit comprises a pair of detectors for respectively generating substantially sinusoidal wave output signals having a phase difference of 120.degree. in terms of electric angle upon detecting a two-phase sine wave output generated by a signal generator and a pair of amplifiers for amplifying the output signals from the pair of detectors and transmitting the non-inverted output signals as a first-phase output signal and a second-phase output signal as well as an inverted signal. Terminals for transmitting the inverted signals from the pair of amplifiers are mutually short-circuited and a third-phase, non-inverted output signal is transmitted from the point of the short-circuit. Such circuit does not require a synthesizer to obtain a third-phase output signal and consequently can be significantly simplified to reduce its manufacturing cost. Moreover, such circuit can enhance the accuracy of three-phase sine wave output signals it transmits. A brushless motor drive circuit using a three-phase sine wave signal synthesizing circuit according to the invention can be significantly simplified to reduce its manufacturing cost.

REFERENCES:
patent: 3775649 (1973-11-01), Bayer et al.
patent: 4306182 (1981-12-01), Curtiss
patent: 4354145 (1982-10-01), Janssen
patent: 4361794 (1982-11-01), Kawada et al.
patent: 4626751 (1986-12-01), Doemen
patent: 4627752 (1986-12-01), Fujisaki et al.
patent: 4658190 (1987-04-01), Miyazaki et al.
patent: 4752725 (1988-06-01), Ominato

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