Motor insulation deterioration detection device

Details Motor insulation deterioration detection device Motor insulation deterioration detection device

2011-03-01

2011-03-01

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S547000

Reexamination Certificate

active

07898264

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 Z1, Z2is measured by a current measuring circuit provided in each inverter unit, and the microcomputer calculates the value of the insulation resistance Z1, Z2from the link voltage value and the current value.

REFERENCES:
patent: 7253639 (2007-08-01), Horikoshi et al.
patent: 2006/0022679 (2006-02-01), Obata et al.
patent: 2006/0158197 (2006-07-01), Horikoshi et al.
patent: 2008/0094022 (2008-04-01), Horikoshi et al.
patent: 2008/0150549 (2008-06-01), Horikoshi et al.
patent: 2006-226993 (2006-08-01), None
patent: 2008-102096 (2008-05-01), None
patent: 2008-157672 (2008-07-01), None
Japanese Notice of Reasons for Rejection mailed Apr. 27, 2010 issued in Japanese Application No. 2008-320088.

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