Brushless three-phase D.C. motor

Details Brushless three-phase D.C. motor Brushless three-phase D.C. motor

1985-05-10

1989-11-21

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 318138, H02K 2122, H02K 2908

Patent

active

048825115

ABSTRACT:
Collectorless (brushless) three-phase DC motor having a permanent-magnet arrangement and a three-phase winding, these being movable relative to each other, and having three position sensors which are stationary relative to the winding and controlled by the permanent-magnet arrangement to supply sensor output signals. The winding's coils are energized by current in a cyclical sequence in dependence upon the sensor output signals, the latter being offset by 120.degree.-el. one from the next. Induced coil voltages are offset by 120.degree.-el.; the coil voltages, in crossing zero, are alternately positive for at most 180.degree.-el. and negative for at most 180.degree.-el. and their sum is equal to zero for all relative positions as between the magnet arrangement and the winding. The position sensors are so arranged relative to the winding's coils that the sensors' changes-of-state substantially coincide with the zero-crossovers of the associated induced coil voltages. The winding's coils are energized via winding driver stages by means of driver voltages which either directly correspond to the sensor output signals or else are derived therefrom.

REFERENCES:
patent: 4151447 (1979-04-01), von der Heide et al.
patent: 4283664 (1981-08-01), Ebert
patent: 4311933 (1982-01-01), Riggs et al.
patent: 4495450 (1985-01-01), Tokizaki et al.
patent: 4554473 (1985-11-01), Muller
patent: 4574211 (1986-03-01), Muller

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