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:
May. 10, 2016
Filed:
Feb. 08, 2010
Yoshimasa Watanabe, Tokyo, JP;
Ryuichi Nishiura, Tokyo, JP;
Yoshiharu Kaneda, Tokyo, JP;
Hiroshi Nishizawa, Tokyo, JP;
Toru Oka, Tokyo, JP;
Hirotaka Muto, Tokyo, JP;
Toshiki Tanaka, Tokyo, JP;
Yoji Tsutsumishita, Tokyo, JP;
Yoshimasa Watanabe, Tokyo, JP;
Ryuichi Nishiura, Tokyo, JP;
Yoshiharu Kaneda, Tokyo, JP;
Hiroshi Nishizawa, Tokyo, JP;
Toru Oka, Tokyo, JP;
Hirotaka Muto, Tokyo, JP;
Toshiki Tanaka, Tokyo, JP;
Yoji Tsutsumishita, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
The invention is related to a device for detecting insulation degradation in an inverter-driven load device, in particular a motor, the device including: zero-phase current measuring means for measuring a zero-phase current in power-feed lines, provided in the power-feed lines between an inverter device and the motor; and command control means for putting rotation of the motor on standby; wherein the zero-phase current measuring means measures the total of phase currents fed into respective phases so as not to rotate a shaft even when an external force is applied to the shaft during the rotation being on standby, whereby allowing regular detection of insulation degradation without switching over the power-feed lines connected with the load device.