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. 04, 2025
Filed:
Feb. 25, 2021
Mitsubishi Electric Corporation, Tokyo, JP;
Koyo Shimizu, Tokyo, JP;
Shinya Toyodome, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An electric motor drive device includes a booster circuit, an inverter, a connection switching device, and first and second control devices. The booster circuit boosts a voltage value of a bus voltage to be applied to a DC bus. The bus voltage is applied to the inverter, and the inverter applies an AC voltage having a variable frequency and a variable voltage value to an electric motor. The connection switching device switches a connection state of windings of the electric motor. The second control device performs zero current control to control the inverter such that a current flowing through the electric motor or the connection switching device is zero. When operating the connection switching device to switch the connection state, the second control device performs the zero current control after a boosting operation of the booster circuit is stopped by the first control device.