Stator punching sheet for low-speed permanent magnet submersible motor

Abstract

The invention discloses a stator punching sheet for a low-speed permanent magnet submersible motor. The stator punching sheet comprises an annular magnet yoke, rabbet line slots and a semi-enclosed notch, wherein the rabbet line slots are uniformly distributed on the annular magnet yoke; and the semi-enclosed notch is positioned at the inner edge of the annular magnet yoke. The stator punching sheet is characterized in that: 27 rabbet line slots are uniformly distributed on the annular magnet yoke; the stator punching sheet is circular; the diameter of the outer circle of the stator punching sheet is 104.8 millimeters; and the diameter of the inner circle, namely the inner edge of the annular magnet yoke is 72 millimeters. The 27 rabbet line slots of the stator punching sheet and the heights of the rabbet line slots can meet the requirement on the wiring of a three-phase winding which can eliminate a larger harmonic component of a fractional slot winding. The diameter of the outer circle of the punching sheet adapts to the technical requirement on the overall diameter of the low-speed permanent magnet submersible motor, and the diameter of the inner circle of the punching sheet is beneficial to appropriate increase of the diameter of a rotor shaft, so that the torsional strength of the rotor shaft is enhanced, and the influence of polarity staggering of magnetic fields of magnetic poles of a rotor caused by torsion of the rotor shaft on the power of the motor is avoided. The stator punching sheet has the outstanding advantage of novel structure.

Description

technical field [0001] The invention relates to a stator of an electric motor, in particular to a stator stamping sheet for a low-speed permanent magnet submersible electric motor. Background technique [0002] According to the principle that the rotation speed of the rotating magnetic field is inversely proportional to the number of stator pole pairs, the existing low-speed submersible motor generally adopts a larger number of pole pairs, and its stator adopts an integral laminated iron core, and the groove shape of the winding insertion groove is an open straight groove and is Double slot. [0003] In conventional three-phase low-speed submersible motors, the ratio of the number of winding slots to the number of phases multiplied by the number of poles is less than one slot, so the stator winding generally adopts a fractional slot winding structure, and the windings of each phase are wound in an overlapping manner. Most of them adopt the double-layer wave winding form, th...

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Problems solved by technology

[0004] The above-mentioned low-speed submersible motors with fractional slot winding structure and double-layer wave winding generally have the defects of difficulty in increasing motor output and high operating noise

[0005] According to the test and analysis of the applicant, the important reason for the formation of the defect is that the structure design of the fractional slot winding is unreasonable, which causes the voltage waveform of the stator winding to have a large harmonic component. The harmonic component causes a large distortion of the magnetic field, and the resulting reaction strong rotating magnetic field

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