Brushless DC motors

Details Brushless DC motors Brushless DC motors

1977-10-26

1979-06-19

Rubinson, Gene Z.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, 318290, H02K 2900

Patent

active

041587952

ABSTRACT:
A brushless DC motor capable of change of rotational direction is disclosed. The feed of a high-frequency voltage signal to switching elements is sequentially changed to orderly excite stator windings by the outputs from rotor angular position detectors so that the rotor is rotated in a desired direction. Another high-frequency voltage signal is applied to the switching elements at a time when opposite direction rotation is required, so that the high-frequency voltage signal applied to one of the switching elements in response to the outputs of the detectors is cancelled by the other high-frequency voltage signal. Therefore, the order of the excitation of stator windings is inverted and, thus, the rotor is rotated in the opposite direction.
The other high-frequency voltage signal has the same frequency as, a greater amplitude than, and a phase difference of 90.degree.-270.degree. from, the high-frequency voltage signal which is applied to one of the switching elements in response to the control of the detectors.

REFERENCES:
patent: 3518517 (1970-06-01), Rainer
patent: 3946292 (1976-03-01), Tanikushi

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