Electroconductive article, having portions with variable resista

Details Electroconductive article, having portions with variable resista Electroconductive article, having portions with variable resista

1993-03-05

1997-04-01

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310201, 310261, 310195, 310 72, 338103, 338295, 1741262, H02K 1716

Patent

active

056169787

ABSTRACT:
An electroconductive material has at least one portion in which the electrical resistance varies continuously along a gradient. Accordingly, since the material is not formed by directly bonding different elements, it does not have a weak joint portion. Further, since other material characteristics besides electrical resistance also vary along a gradient, for instance, when the material is used at a high or low temperature, a large thermal stress does not generate at an interface between different elements of the material due to a difference of thermal expansion coefficients of such elements. A motor uses the above electroconductive material as a conductor provided in a plural slots. Consequently, starting characteristics of the motor are improved due to the skin effect, and internal stress of the motor due to the thermal expansion of the conductor is decreased. Moreover, the reliability of the motor is improved.

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Itoh & Kashiwaya, "Residual Stress Characteristics of Functionally Gradient Materials", Journal of the Ceramic Society of Japan: 100 [4]476-481 (1992) .

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