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Design method for double-skewed-slot rotor structure in few-slot near-slot fit

A technology of near-slot fit and rotor structure, applied in the manufacture of stator/rotor body, magnetic circuit shape/style/structure, electrical components, etc., can solve the problem of weakening the degree of harmonic magnetic field, etc., to weaken the source of radial force electromagnetic noise , reduce electromagnetic vibration and noise, and expand the selection range

Active Publication Date: 2020-02-18
HEFEI UNIV OF TECH
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Problems solved by technology

[0006] Aiming at the problem of electromagnetic vibration and noise in induction motors with few slots and close slots, the present invention proposes a double-slanted rotor structure design method with few slots and close slots, and coordinates the chute distance and staggered distance to further improve the degree of weakening the harmonic magnetic field , effectively reducing the amplitude of the low-order radial electromagnetic force wave

Method used

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  • Design method for double-skewed-slot rotor structure in few-slot near-slot fit
  • Design method for double-skewed-slot rotor structure in few-slot near-slot fit
  • Design method for double-skewed-slot rotor structure in few-slot near-slot fit

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Embodiment Construction

[0036] The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.

[0037] Structural design method of double-sloped rotor with few slots and close slot fit, used to design Z 2 = Z 1 -p virtual equal-slot and slot-matched double-sloped rotor structure.

[0038] For Example 1, take a four-pole motor with 36-34 slots as an example.

[0039] Step 1: List the order table of the low-order radial force wave corresponding to the groove fit, and determine the harmonic magnetic field component and the corresponding stress wave order that generate the low-order radial force.

[0040] Table 1 is the low-order radial force wave order table ...

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Abstract

The invention discloses a design method for a double-skewed-slot rotor structure in few-slot near-slot fit. The method comprises the following steps of: 1, listing a low-order radial force wave ordertable corresponding to slot fit, and determining a harmonic magnetic field component for generating a low-order radial force and a corresponding stress wave order, 2, calculating a radial force wave expression generated by a stator and rotor harmonic magnetic field by utilizing a Maxwell law, and obtaining an average radial force formula of the whole length of the rotor through basic mathematicaloperation, and 3, calculating a double-skewed-slot coefficient of the harmonic magnetic field near a default parameter, and when the absolute value of the double-skewed-slot coefficient correspondingto the harmonic magnetic field generating the main low-order radial force is minimum, determining the design parameter of the double-skewed-slot rotor. The skewed-slot distance and the staggered distance are designed in a matched mode, electromagnetic vibration noise is reduced, the degree of weakening a harmonic magnetic field is further improved, and the amplitude of low-order radial electromagnetic force waves is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of design of cage-type induction motors, in particular to a design method of a double-slanted-slot rotor whose number of rotor slots is less than and close to that of a stator slot. Background technique [0002] The air gap magnetic field in the motor acts on the iron core of the motor to generate electromagnetic force, which causes electromagnetic vibration and noise of the motor. The electromagnetic noise is a non-negligible component of the motor noise. For motors with few slots, where the number of rotor slots is less than that of the stator slots, electromagnetic vibration noise is the main consideration for selecting slots, especially for near slots where the number of stator and rotor slots is close, the radial electromagnetic force wave order of the motor is low, When the core is bent and deformed, the greater the degree of deformation of the adjacent nodes, the greater the electromagnetic noise. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/16H02K15/02
CPCH02K1/165H02K15/024
Inventor 鲍晓华徐威徐翌翔程帅李仕豪陈国玮
Owner HEFEI UNIV OF TECH
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