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:
Oct. 20, 1992
Filed:
Jul. 26, 1991
Takashi Hara, Koriyama, JP;
Sueo Matsumoto, Koriyama, JP;
Tetsuro Shimmura, Toyohashi, JP;
Tsutomu Kinoshita, Kosai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Asmo Co., Ltd., Shizuoka, JP;
Abstract
A brushless motor includes a rotor having permanent magnets and a coil for rotating the rotor. In the motor, a switching element is connected between the coil and a power source, a magnetic sensor is provided for detecting the position of one of the permanent magnets of the rotor to control the switching operation of the switching element, and a delay circuit is provided for delaying a signal from the magnetic sensor and then applying the delayed signal to the switching element. With this arrangement, the apparent hysteresis width of the magnetic sensor can be broadened and the prior art problem is avoided wherein variations in the hysteresis width of the magnetic sensor results in disabled rotation of the rotor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile