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:
Nov. 05, 2019
Filed:
Mar. 06, 2018
Applicant:
Minebea Mitsumi Inc., Nagano, JP;
Inventors:
Tetsuya Seki, Fukuroi, JP;
Kei Yamazaki, Ota-ku, JP;
Assignee:
MINEBEA MITSUMI INC., Nagano, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 8/22 (2006.01); H02P 6/28 (2016.01); H02P 8/02 (2006.01); H02P 8/12 (2006.01); H02P 27/08 (2006.01);
U.S. Cl.
CPC ...
H02P 8/22 (2013.01); H02P 6/28 (2016.02); H02P 8/02 (2013.01); H02P 8/12 (2013.01); H02P 27/085 (2013.01); H02P 2209/09 (2013.01);
Abstract
A motor drive controller capable of taking measures against vibration or noise of a motor is provided. The motor drive controller configured to drive a stepping motor in microstepping mode controls the number of PWM (Pulse Width Modulation) cycles contained in one microstep cycle. More specifically, the number of PWM cycles contained in one microstep cycle is controlled so that a vibration contained in a current waveform determined by the number of PWM cycles contained in one microstep cycle does not approximate the natural frequency of the stepping motor.