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. 16, 1990
Filed:
Aug. 09, 1988
Applicant:
Inventor:
Shohei Yamazaki, Hamamatsu, JP;
Assignee:
Yamaha Corporation, Hamamatsu, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 31856818 ;
Abstract
A motor driving circuit capable of driving a motor with a single circuit regardless of whether the motor used is a brush motor or a brushless motor. The circuit detects a speed error between actual speed and commanded speed of the motor and provides a speed error signal. An inversion circuit selectively inverts or non-inverts the speed error signal in response to the type of the motor and desired motor rotation direction. When a brushless motor is used, the non-inverted error signal is employed for controlling driving of the motor. When a brush motor is used, the inverted speed error signal is employed.