Digital-analog driver for brushless D.C. spindle motor

Details Digital-analog driver for brushless D.C. spindle motor Digital-analog driver for brushless D.C. spindle motor

1992-02-27

1993-05-11

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02P 602

Patent

active

052104745

ABSTRACT:
A digital-analog driver circuit for a plural-phase brushless D.C. motor includes a logic circuit responsive to commutation control signals for generating commutation gating signals, a digital function generation circuit responsive to a commutation signal supplied by the logic circuit and further responsive to a high frequency clocking signal, for generating a pulse width modulated digital function signal having a base period of the high frequency clocking signal and a timed interval synchronized to the commutation signal and for supplying the digital function signal to the logic circuit, the logic circuit including a function signal inversion circuit for generating an inverted digital function signal, and having a gating circuit for selectively putting out the digital function signal and the inverted digital function signal in synchronism with the commutation signal, plural digital to analog converters each for converting the digital function signal and the inverted digital function signal into an analog phase driving signal, and plural phase transistor drivers each being responsive to a said analog phase driving signal, for applying a driving current to a phase winding of the brushless D.C. motor.

REFERENCES:
patent: 4429262 (1984-01-01), Utenick
patent: 4583028 (1986-04-01), Angersbach et al.
patent: 4603283 (1986-07-01), Oltendorf
patent: 4644234 (1987-02-01), Nola
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4835448 (1989-05-01), Dishner et al.
patent: 4922169 (1990-05-01), Freeman
patent: 5034668 (1991-07-01), Bausch
King and Carbolante, "Spindle Motor Drive IC Designed in BCD Technology with Improved Transient Characteristics", Proc. 20th Symposium Incremental Motion Control Systems and Device, San Jose, Calif. Jun. 18, 1991, pp. 263-269.

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