Single-phase induction motor and hermetic compressor having it

Abstract

The invention discloses a single-phase induction motor which comprises a stator iron core, a main winding and an auxiliary winding. Stator grooves are formed in the stator iron core. The number of the stator grooves is integer multiples of 4. The stator grooves comprise large stator grooves and small stator grooves. The radial depth of the large stator grooves in the stator iron core is larger than that of the small stator grooves in the stator iron core. The main winding is provided with two single-phase poles and wound by wires in a concentric mode, and the main winding is inserted into the large stator grooves and / or the small stator grooves. The auxiliary winding is provided with two single-phase poles and wound by wires in a concentric mode, and the auxiliary winding is inserted into the small stator grooves and slantly arranged by 90 degrees relative to the main winding in the circumferential direction of the stator iron core. Each pole of the main winding and each pole of the auxiliary winding are respectively composed of a plurality of coils wound by the wires in the concentric mode, wherein the turns of each coil of each pole of the main winding is configured into the mode that 3-time harmonic content of the main winding is increased and 5-7-time harmonic content is decreased. Therefore, according to the configuration, the 3-time harmonic content is increased, starting torque is improved by means of 3-time harmonic torque, and the high efficiency and the high-starting performance are achieved. The invention further discloses a sealing-type compressor.

Description

technical field [0001] The present invention relates to a single-phase induction motor and a hermetic compressor having the single-phase induction motor. Specifically, the present invention relates to a single-phase 2-pole wound single-phase induction motor and a hermetic compressor having the same. Background technique [0002] In the related art, a 2-pole wound single-phase induction motor is widely used in fixed-speed compressors. The 2-pole wound single-phase induction motor has a stator core composed of a plurality of laminated steel plates. The main and auxiliary windings and cast aluminum or copper cage rotors are inserted into the stator slots in a concentric winding manner, thus possessing the ability of self-starting. [0003] During the starting process of the above-mentioned single-phase induction motor whose speed changes from 0 to a stable running speed, the mechanical torque output by the motor is a synthetic torque jointly generated by the fundamental magnet...

AI Technical Summary

Problems solved by technology

The use of sinusoidal windings in the stator winding simply weakens the 3rd harmonic torque, 5th harmonic torque and 7th harmonic torque, and does not consider the use of harmonic torque, mainly the 3rd harmonic torque to increase the speed from 0 to The starting torque of the motor under N / 3, so the starting torque of the motor climbs slowly at the speed of 0 to N / 3, which brings the problem that the compressor needs a long time to start again after stopping or even cannot start.

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