The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 1995
Filed:
Mar. 17, 1994
Applicant:
Inventor:
Atsuyuki Hiruma, Fuji, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01R / ;
U.S. Cl.
CPC ...
318439 ; 318807 ; 318798 ; 318782 ;
Abstract
When power is sequentially supplied to the phase coils of a brushless DC motor, the rotor of the brushless DC motor is rotated. At this time, a voltage is induced in one of the phase coils to which power is not supplied. The rotational position of the rotor is detected from the induced voltage. The switching timing of power supply to the phase coils is determined in accordance with the detected rotational position. When a service operation mode switch is operated, a service operation is executed, and power supply to the respective phase coils is forcibly switched at a predetermined frequency. A failure can be diagnosed during this service operation.