Brushless d-c motor

Details Brushless d-c motor Brushless d-c motor

1974-02-14

1976-02-10

Schaefer, Robert K.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, H02K 2900

Patent

active

039380149

ABSTRACT:
A brushless d-c motor of the type having a permanent magnet rotor and a plurality of stator windings which are energized from a common d-c power source through transistors in response to means which detect the rotating position of the rotor in a manner such that the conductance of the transistors are so controlled as to ensure proper rotation, in which, means are provided for detecting the currents flowing through the stator windings and the outputs of these means used to control the transistors supplying current to the stators such as to equalize the current flow from stator winding to stator winding, thereby permitting transistors having unmatched gains to be used in the motor.

REFERENCES:
patent: 3577176 (1971-05-01), Kreithen
patent: 3750000 (1973-06-01), Bruckner et al.
patent: 3767896 (1973-10-01), Wada
patent: 3831071 (1974-08-01), Mitsui

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