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. 01, 2011
Filed:
Nov. 23, 2009
Shinichi Horikoshi, Minamitsuru-gun, JP;
Hiroyasu Sato, Minamitsuru-gun, JP;
Akira Hirai, Minamitsuru-gun, JP;
Shinichi Horikoshi, Minamitsuru-gun, JP;
Hiroyasu Sato, Minamitsuru-gun, JP;
Akira Hirai, Minamitsuru-gun, JP;
Fanuc Ltd, Minamitsuru-gun, Yamanashi, JP;
Abstract
Disclosed is an insulation deterioration detection device that can accurately detect insulation deterioration in multiple motors by a simple circuit configuration. When detecting insulation deterioration, one end A of a smoothing capacitor is connected via a first switch to ground, and the other end B is connected via a second switch to motor windings; in this condition, link voltage is measured by a voltage measuring circuit provided in a converter unit, and the measured link voltage value is transmitted to a microcomputer in each inverter unit via serial communication. Current flowing via motor insulation resistance Z, Zis measured by a current measuring circuit provided in each inverter unit, and the microcomputer calculates the value of the insulation resistance Z, Zfrom the link voltage value and the current value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile