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. 22, 2025
Filed:
Jul. 08, 2021
Mitsubishi Electric Corporation, Tokyo, JP;
Yuki Yoshida, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A control device includes a power converter, reference rotational speed obtainer, and abnormality determiner. The power converter feeds power to motors. The reference rotational speed obtainer, when rotational speed sensors are determined to include a suspected abnormal sensor suspected of having abnormality, obtains a reference rotational speed from signals output from the rotational speed sensors other than the suspected abnormal sensor and indicating rotational speeds. The abnormality determiner determines that the motor corresponding to the suspected abnormal sensor has abnormality when the difference between a modulation factor obtained from a command value of voltage output from the power converter and a comparative modulation factor set in advance is larger than or equal to a modulation-factor threshold, and determines that the suspected abnormal sensor has abnormality when the difference between the modulation factor obtained from the reference rotational speed and the comparative modulation factor is smaller than the modulation-factor threshold.