Brushless motor driving circuit

Details Brushless motor driving circuit Brushless motor driving circuit

1977-06-29

1978-09-12

Rubinson, Gene Z.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, H02K 2900

Patent

active

041140737

ABSTRACT:
A driving circuit for a brushless motor of the type having a permanent magnet rotor and plural phase stator windings. The driving circuit includes position detectors for detecting the rotary position of the rotor. Switching devices are provided for supplying driving currents in sequence to the plural phases of the stator windings in accordance with the position of the rotor. The durations of the driving currents are controlled such that a portion of such currents flowing through adjacent phases are overlapped when the motor is started up; but the duration of each driving current is reduced as the motor approaches a normal speed so as to correspondingly reduce the overlapped portions. Preferably, the durations of the currents are reduced as the speed of the motor increases until such currents no longer have overlapped portions.

REFERENCES:
patent: 3716769 (1973-02-01), Brunner
patent: 3839661 (1974-10-01), Wada
patent: 3864610 (1975-02-01), Kawamoto et al.
patent: 3986086 (1976-10-01), Muller

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