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:
Dec. 31, 2019
Filed:
Feb. 14, 2019
Minebea Mitsumi Inc., Nagano, JP;
MINEBEA MITSUMI INC., Nagano, JP;
Abstract
A motor control circuit () capable of performing a high-precision step-out determination under a wide range of conditions. The motor control circuit () includes an input voltage measuring unit (), a temperature measuring unit (), a back electromotive force measuring unit (), a determination threshold value setting unit, and a determination unit. The input voltage measuring unit () measures an input voltage input to a motor control device (). The temperature measuring unit () measures temperature. The back electromotive force measuring unit () measures back electromotive force induced in a coil for which energization is stopped out of the coils of plural phases. The determination threshold value setting unit sets a determination threshold value of back electromotive force based on a measurement result of the input voltage measuring unit () and a measurement result of the temperature measuring unit (), and based on a determination reference value that is preset for each of plural partial areas sectioned in a matrix form with a threshold value relating to the input voltage and a threshold value relating to the temperature. The determination unit makes a determination on step-out of a stepping motor () based on a measurement result of the back electromotive force measuring unit () and the set determination threshold value of the back electromotive force.