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:
Mar. 11, 2025
Filed:
Nov. 09, 2021
Oriental Motor Co., Ltd., Tokyo, JP;
Akihiko Houda, Tsukuba, JP;
ORIENTAL MOTOR CO., LTD., Tokyo, JP;
Abstract
A motor control device controls an AC motor by sensorless control. The motor control device includes: an inverter; a multilayer printed circuit board including an inner layer having a wiring pattern provided in a current line connecting the inverter to a winding of the AC motor; a plurality of chip inductors mounted on a major surface of the multilayer printed circuit board in opposed relation to the wiring pattern, and connected in series to form a series circuit having a midpoint connected to a reference potential; load resistors connected between the midpoint of the series circuit and the opposite ends of the series circuit; a differential amplification circuit connected to the series circuit; and a control unit that estimates the position of the rotor of the AC motor by using an output of the differential amplification circuit, and generates the pulse width modulation signal to be supplied to the inverter.