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:
Jan. 03, 2023
Filed:
Jan. 21, 2021
Caterpillar Inc., Peoria, IL (US);
Jesse Ray Gerdes, Dunlap, IL (US);
James Michael Thorne, Dunlap, IL (US);
Ahmed Khalil, Dunlap, IL (US);
Jackson Wai, Dunlap, IL (US);
Sajan Abdul, Dunlap, IL (US);
Amara Ashfaq, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
Power based self-sensing of a rotor position of an SR motor at mid to high speeds and low torque is achieved by an SR motor control system by comparing the motor power to an injection maximum power. A position current pulse is injected to a stator pole in response to the motor power being less than the injection maximum power. An actual stator current created by the position current pulse is compared to an estimated stator current, and a stored estimated rotor position in a memory is updated to a new estimated rotor position if the actual stator current is not equal to the estimated stator current.