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:
Dec. 07, 2010
Filed:
Jul. 25, 2007
Shinji Shibuya, Kiryu, JP;
Shinji Shibuya, Kiryu, JP;
Mitsuba Corporation, Kiryu-Shi, JP;
Abstract
When starting a brushless motor, if the stop position of the rotor is detected between time tand time t, a start-up excitation pattern in accordance with the rotor stop position is input for an initial energization time Ts. Afterward, when the energization is stopped, a plurality of signals SL, SL, SL, SLare generated in sequence in excitation switch timing signals in accordance with the rotational position of the coasting rotor. From these signals SLto SL, the rotor position is detected using the second and subsequent signals SLto SLand then the process shifts to ordinary energization switch control. In accordance with the present invention, it is possible to start up a motor in a short time with a simple method so as to obtain a large torque during start-up.