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. 02, 2013
Filed:
Nov. 18, 2011
Yoichi Kawai, Aichi, JP;
Yoichi Kawai, Aichi, JP;
OKUMA Corporation, Aichi, JP;
Abstract
A motor magnetic pole position correction method includes preventing a movement of a movable element of a direct drive motor by mechanical brake (step S), generating a command that designates a position spaced or separated from the present position (step S), detecting a torque command value of the direct drive motor (step S), determining a magnetic pole position correction value based on a comparison between the detected torque command value and a predetermined threshold value (steps Sand S), storing the determined magnetic pole position correction value in a memory (step S), and performing motor control using an electrical angle offset value obtained based on the magnetic pole position correction value stored in the memory.