Rotating electric machine
First Claim
1. A rotating electric machine, comprising:
- a rotor;
a circular stator having a plurality of stator cores connected about an outer periphery of the rotor and an annular member disposed on an outer periphery of the plurality of stator cores each of the plurality of stator cores having a tooth with a tip directly facing the rotor;
a case for housing the rotor and the stator;
a resin molded section formed along an inner peripheral face of the stator and covering slot openings between stator cores, the resin molded section having a substantially cylindrical shape and being provided with a plurality of openings into which the tips of the teeth are inserted;
a cooling passage extending along an axial direction of the rotor and being defined by adjacent stator cores and the resin molded section; and
wherein the annular member is formed from a material which has a larger coefficient of linear expansion than a magnetic material comprising the stator cores so as to reduce stresses acting between the resin molded section and the stator cores, the stresses being caused by the difference of the coefficient of linear expansion between the resin molded section and the stator cores.
1 Assignment
0 Petitions
Accused Products
Abstract
An annular member 51 is fitted to the outer periphery of the stator cores in a rotating electric machine. The rotating electric machine has a cooling passage 29 in an axial direction between a resin molded section 50 and adjacent stator cores 20. The annular member 51 is formed from a material which has a larger coefficient of linear expansion than the magnetic material comprising the stator cores. At low temperatures, stress resulting from the differential between the coefficient of linear expansion of the stator core and the resin molded section is reduced because an inward compressive force is applied to the stator core by the annular member as a result of the difference in the coefficient of linear expansion.
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Citations
11 Claims
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1. A rotating electric machine, comprising:
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a rotor;
a circular stator having a plurality of stator cores connected about an outer periphery of the rotor and an annular member disposed on an outer periphery of the plurality of stator cores each of the plurality of stator cores having a tooth with a tip directly facing the rotor;
a case for housing the rotor and the stator;
a resin molded section formed along an inner peripheral face of the stator and covering slot openings between stator cores, the resin molded section having a substantially cylindrical shape and being provided with a plurality of openings into which the tips of the teeth are inserted;
a cooling passage extending along an axial direction of the rotor and being defined by adjacent stator cores and the resin molded section; and
wherein the annular member is formed from a material which has a larger coefficient of linear expansion than a magnetic material comprising the stator cores so as to reduce stresses acting between the resin molded section and the stator cores, the stresses being caused by the difference of the coefficient of linear expansion between the resin molded section and the stator cores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification