04158795 is referenced by 14 patents and cites 2 patents.

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.

Title
Brushless DC motors
Application Number
5/845618
Publication Number
4158795
Application Date
October 26, 1977
Publication Date
June 19, 1979
Inventor
Junichi Kanamori
Tokyo
JP
Kenkichi Tarumi
Tokyo
JP
Agent
Harris Kern Wallen & Tinsley
Assignee
Sansui Electric
JP
IPC
H02K 29/00
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