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:
Feb. 24, 2015
Filed:
Oct. 03, 2011
Munetaka Kashiwa, Tokyo, JP;
Munetaka Kashiwa, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A micro-step driving control apparatus for a stepping motor in which torque fluctuations caused by influence of detent torque can be reduced without performing preliminary driving, including: a phase difference estimator calculating, based on detected motor current and a command value, an estimated phase difference between the command value and the current; low-speed and high-speed motor rotational angle estimators calculating an estimated motor rotational angle at a low speed rotation and an estimated motor rotational angle at a high speed rotation; an addition unit calculating, based on the command value, an estimated motor rotational angle by mixing the estimated motor rotational angles at an appropriate rate; a detent torque estimator calculating, based on the mixed estimated motor rotational angle, estimated detent torque; and a compensation signal generator generating a compensation signal based on the estimated detent torque and the mixed estimated motor rotational angle.