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:
Jul. 23, 2002
Filed:
Mar. 21, 2001
Fumito Komatsu, Hirooka, Shiojiri-shi, Nagano 399-0702, JP;
Other;
Abstract
A small synchronous motor with high reliability so devised that transition from start operation to synchronous operation is ensured. A microcomputer switching-controls the current application range to a range where the rectified current flowing through a rectifying bridge circuit and an A-coil alternately is inverted during one turn of a permanent magnet rotor to suppress the input on the inverted side with respect to the non-inverted side and thereby to start a synchronous motor, turns off first to fourth transistors when the rotational speed of the permanent magnet rotor regulated by the power source frequency and measured by a power source frequency measuring section and turns on triacs SW and SW thereby making a switch to the synchronous operation circuit