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. 27, 2021
Filed:
Dec. 14, 2017
Minebea Mitsumi Inc., Nagano, JP;
Hiroaki Murakami, Hamamatsu, JP;
MINEBEA MITSUMI INC., Nagano, JP;
Abstract
A motor driving control device includes an induced voltage detecting unit configured to detect an induced voltage of a motor, a controller for generating a PWM signal, and an inverter circuit for outputting a driving signal to the motor based on the PWM signal. The controller is configured to detect a position detection signal, to measure a zero-cross point of the induced voltage of the motor based on a detected timing of an edge of the position detection signal, to stop output of the driving signal only for a predetermined period containing the zero-cross point of the induced voltage, to measure a pulse width of a regenerated voltage in the period, to calculate a zero-cross point of coil current based on the measurement result, and to adjust the energization timing based on the calculation result. The predetermined period is a period of one cycle of the PWM signal.