Control device for brushless motor

Details Control device for brushless motor Control device for brushless motor

1983-12-16

1985-01-22

Truhe, J. V.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, 318439, H02K 2902

Patent

active

044954506

ABSTRACT:
A control device for brushless motor comprises an inverter (3), a control circuit (8) and a rotor position detecting circuit (9). In the rotor position detecting circuit (9), voltage induced in stator coils (U, V and W) due to rotation of a rotor (7) and neutral voltage at a virtual neutral point (25) are compared by comparators (CU, CV and CW) so that polarity changing points can be detected. The control circuit (8) controls the inverter (3) based on the above stated polarity changing points so as to control changeover of the modes for conducting to the stator coils (U, V and W). As a result, rotation of a brushless motor can be controlled without using Hall elements.

REFERENCES:
patent: 4262236 (1981-04-01), Gelenius et al.
patent: 4270074 (1981-05-01), Duckworth et al.
patent: 4446406 (1984-05-01), Uzuka

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