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. 29, 2025
Filed:
Sep. 01, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Masaki Hano, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
There are provided a brushless motor control device and a brushless motor control method that can suppress occurrence of step-out caused by reverse rotation, in low-speed sensorless control of a brushless motor. The brushless motor control device applies, to a brushless motor, a positive pulse generating torque in a rotation direction of the brushless motor and a negative pulse generating torque in a reverse rotation direction, and detects a rotation direction by using a magnetic saturation voltage generated when the positive and negative pulses are applied. The control device sets an upper limit value to a motor application duty represented by a value obtained by subtracting an application duty of the negative pulse from an application duty of the positive pulse.