Driving control apparatus for brushless motor with optimum contr

Details Driving control apparatus for brushless motor with optimum contr Driving control apparatus for brushless motor with optimum contr

1992-01-28

1993-07-20

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2900

Patent

active

052296938

ABSTRACT:
A position detector detects the position of a rotor of a brushless motor. A driving signal generator generates a driving signal at a timing corresponding to the detected position. While the driving signal is received, a driving circuit sequentially ON/OFF-operates switching elements of an inverter circuit. At this time, a rotational speed detector detects a rotational speed of the brushless motor. A rotational speed controller controls the duty of ON/OFF operations of the switching elements, performed by the driving circuit, through a chopper signal generator in accordance with the difference between a detected rotational speed and a designated rotational speed. If the detected rotational speed does not reach the designated rotational speed even when the duty becomes a preset value or more, the rotational speed controller generates a phase shift signal for advancing the phase of the driving signal from that of a driving signal in a normal operation, and supplies it to the driving signal generator. Upon this phase shift operation, in the brushless motor, a magnetic flux effectively acting from the rotor to armature windings is reduced as compared with a magnetic flux in a normal operation. Thus, the rotational speed of the brushless motor can be reliably set to a desired value without decreasing the operation efficiency.

REFERENCES:
patent: 4528485 (1985-07-01), Boyd, Jr.
patent: 4608527 (1986-08-01), Glennon et al.
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 4818908 (1989-04-01), Tamae et al.
patent: 4835448 (1989-05-01), Dishner et al.
patent: 4888533 (1989-12-01), Gotoh et al.
TLP 557; Toshiba; pp. 359-363.
TLP521-1,-2,-3,-; Toshiba; pp.294-299.

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