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. 14, 2025
Filed:
Aug. 23, 2020
Tmeic Corporation, Chuo-ku, JP;
Hirotaka Sato, Tokyo, JP;
TMEIC Corporation, Chuo-ku, JP;
Abstract
An electric motor drive device that includes an electric motor, a main circuit, a current sensor, and a control unit. The electric motor has a plurality of windings. The main circuit transforms power into AC power and supplies the AC power to each of the plurality of windings. The current sensor detects a load current flowing through each of the windings. The control unit controls the main circuit on the basis of a current value detected by the current sensor and controls an amount of power to be supplied from the main circuit to the electric motor on the basis of an amplitude of the load current associated with detection of an undervoltage state of the AC power supply in a state in which the main circuit uses conversion rule in which an index value for the amplitude of the load current flowing through the plurality of windings is defined.