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:
Apr. 24, 1984
Filed:
Jul. 16, 1982
Katsuo Kobari, Tokyo, JP;
Fanuc Ltd., Tokyo, JP;
Abstract
A control system for a synchronous motor which is employed as a servomotor, wherein a pulse coder is employed for detection of the absolute position of one of the field poles of the motor, the absolute position being a component of the input signals for generating a poly-phase alternating current voltage which generates a rotating field maintaining a fixed amount of phase difference with respect to the absolute position of one of the field poles of the motor, thereby the synchronous motor is controlled to run maintaining a fixed amount of internal phase angle of e.g. .pi./2 for the entire operation period, wherein the improvement is that the pulse coder has two pulse coder elements, one of which detects the absolute position of one of the field poles of the motor and the other of which generates incremental pulses during each interval of the signals representing the absolute position of one of the field poles, thereby a larger amount of resolving power is realized for the pulse coder, ultimately improving the performance of the control system.