Electric motor and hermetic compressor comprising same

Abstract

A motor and a hermetic compressor including the motor according to an embodiment of the present invention comprise: a rotor having a plurality of permanent magnets provided in a rotor core; a connection portion formed of a non-magnetic material and provided at an axial end portion of the rotor core; the inertia core is made of magnetic materials and is arranged at the axial end part of the connecting part; the connecting part comprises a plurality of first fixing parts and a plurality of second fixing parts; the plurality of second fixing parts are separated from the plurality of first fixing parts in the axial direction; and a plurality of connecting portions bent toward each other from the plurality of first fixing portions and the plurality of second fixing portions, whereby it is possible to suppress magnetic flux leakage of the permanent magnets and to improve rotational inertia of the rotor, thereby achieving miniaturization and high efficiency.

Description

technical field [0001] The present invention relates to an electric motor and a hermetic compressor including the electric motor. Background technique [0002] In the hermetic compressor, the electric motor part and the compression part constituting the compressor main body are provided together in the inner space of the casing. Such hermetic type compressors are classified into reciprocating type, rotary type, vane type, scroll type, etc. according to the method of compressing the refrigerant. constitute. [0003] Recently, with the miniaturization trend of hermetic compressors, miniaturization research for increasing the output density per unit volume of the motor is being conducted. However, when the motor is miniaturized, the inertial force of the motor is reduced, resulting in a reduction in the efficiency of the compressor, an increase in vibration, and a possible reduction in mechanical reliability. [0004] Therefore, as in Patent Document 1 (Japanese Laid-Open Pa...

AI Technical Summary

Problems solved by technology

However, since the core (rotating inertial body) disclosed in Patent Document 2 is formed in a cylindrical shape made of magnetic material as a whole, not only the leakage of magnetic flux increases, but also the weight of the rotor increases depending on the compensation degree of the inertial force, which may reduce the motor efficiency

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