Three-phase brushless servo motor

Details Three-phase brushless servo motor Three-phase brushless servo motor

1995-06-01

1999-08-24

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 500, H02P 602

Patent

active

059428635

ABSTRACT:
In a three-phase brushless servo motor used in various electrical apparatus, Hall element signals are processed so as to provide an artificial encoder. Three-phase Hall elements shifted in phase from each other by 120 degrees in electrical angle are provided inside a brushless motor, and a selection/inversion circuit generates a saw-tooth-wave from output signals of the three-phase Hall elements. A differentiation circuit differentiates the saw-tooth-wave to thereby obtain a signal which is proportional to the rotational speed of the brushless motor and which is used as speed information for motor speed control in a motor driving circuit. Thus, a low-cost and small-sized three-phase brushless servo motor which requires no encoder for rotational speed detection is realized.

REFERENCES:
patent: 4639798 (1987-01-01), Harrison et al.
patent: 4697125 (1987-09-01), Goff et al.
patent: 4988273 (1991-01-01), Faig et al.
patent: 5289099 (1994-02-01), Bahn
patent: 5362222 (1994-11-01), Faig et al.
patent: 5469032 (1995-11-01), Otake
patent: 5665965 (1997-09-01), Durham, III

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