Method for judging a status of varnish impregnation

Details Method for judging a status of varnish impregnation Method for judging a status of varnish impregnation

2007-03-26

2010-10-19

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S043000, C427S104000, C029S596000, C029S598000

Reexamination Certificate

active

07816821

ABSTRACT:
A varnish impregnation state determination method for determining a varnish impregnation state of a core assembly that is formed by disposing a coil inside a slot of a motor core and impregnating the coil and an interior of the slot with a varnish, including applying an alternating current voltage between the motor core and the coil to determine tan δ that serves as a dielectric dissipation factor; and determining that the varnish impregnation state of the core assembly is normal when a value of the tan δ is equal to or smaller than a predetermined non-defective article reference value.

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Zhengyan et al., “A New Approach to Compatibility of Magnet Wire and Varnish Using Dielectrometry,” Conference Record of the 1985 International Conference on Properties and Applications of Dielectric Materials, vol. 2, pp. 447-450, 1985.

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