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High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor

A technology of sinusoidal distribution and air-gap magnetic field, which is used in synchronous motors for single-phase current, manufacturing stator/rotor bodies, etc., which can solve the problems of difficulty in realizing sinusoidal distribution of air-gap magnetic field and limited selection range.

Active Publication Date: 2016-03-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For small and medium-sized motors, due to mechanical strength and manufacturing process, the slot pitch number Z that can satisfy the symmetry condition of the motor winding 2 ’ There are not many solutions, resulting in a very limited selection range of γ, and it is difficult to realize the sinusoidal distribution of the air gap magnetic field

Method used

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  • High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor
  • High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor
  • High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] see Figure 1 ~ Figure 3 , the high-speed secluded pole electric excitation synchronous motor rotor with sinusoidal air gap magnetic field distribution, including the rotor core (1) and the field winding (2) embedded therein, is characterized in that:

[0076] (a) Each pole has 2n teeth, the middle one is a large tooth (3), and its center line is the pole center line (4); each small tooth (5) has equal tooth spacing, and the magnetic pole neutral line (6) is the centerline of the small tooth;

[0077] (b) There are n slots (7) on both sides of the large tooth of each pole, which are used to place the excitation winding (2) of the pole. The number of wires embedded in each slot is determined according to the principle of the sinusoidal distribution of the air gap magnetic field. The maximum slot depth is restricted by the mechanical strength, stiffness and magnetic density of the yoke, and the size of each slot is determined by the number and diameter of the wires in th...

Embodiment 2

[0080] The method for determining the structural parameters of the high-speed hidden pole electric excitation synchronous motor rotor with sinusoidal distribution of the air gap magnetic field is characterized in that the specific operation steps are as follows:

[0081] Note the half-pitch angle—the space angle between the centerline of the small tooth and the centerline of the adjacent slot is α, and the unit is arc degrees. Take the neutral line of the magnetic pole as the origin of the angle coordinates, that is, θ=0, then the center of the magnetic pole θ=π / 2, θ at the center of the ith slot i =(2i-1)α, i=1,2,...,n.

[0082] (a) Determine the value of n according to the technical requirements and actual size. The value of n needs to be large if the magnetic force sine degree is high; the value of n can be large if the rotor size is large;

[0083] (b) In order to make the magnetic potential distribution close to sine, the winding turns must be close to cosine distributio...

Embodiment 3

[0100] This implementation example is a high-speed hidden pole electric excitation synchronous motor rotor with 6 poles and a sinusoidal distribution of the air gap magnetic field where n is 4, such as figure 1 shown.

[0101] (a) Each pole has 8 teeth, the middle one is a large tooth, the center line of which is the center line of the pole, each small tooth is equally spaced, and the neutral line of the magnetic pole is the center line of the small tooth.

[0102] (b) There are 4 slots on both sides of the large teeth of each pole, which are used to place the field winding of the pole. The number of wires embedded in each slot is determined according to the principle of the sinusoidal distribution of the air gap magnetic field. The maximum slot depth of each slot is restricted by the mechanical strength, stiffness and magnetic flux of the yoke. In this case, the slot depth of each slot is the same, and the slot width is determined by the The number of wires in the groove and...

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Abstract

The invention relates to a high-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and a structural parameter determination method of the rotor. Each pole of the rotor includes 2n teeth, the large tooth is arranged in the middle, 2n grooves are distributed in symmetry in the two sides respectively to place excitation windings of the poles, the excitation winding of each pole is formed by connecting n concentric excitation coils of the different turn numbers and pitches in series, and the size of each groove is determined by the number of leads of the groove, as shown in the figure. According to the sine distribution of the air gap magnetic field, the groove number, the pitch and the conductor number of each groove are determined in the principle that the winding turns are distributed in the cosine manner, so that the waveform of the air gap magnetic field approximates to the sine distribution, the harmonic wave component of the magnetic field is reduced, the torque ripple and the vibration noise of the motor are reduced, the loss is reduced, and the motor efficiency is improved. In addition, compared with a salient-pole synchronous motor rotor, the non-salient-pole rotor can greatly improve the highest rotating speed of safe operation, the heat radiation area of the excitation winding can be increased, and the power density of the motor can be improved.

Description

technical field [0001] The invention relates to a rotor of a secluded pole electric excitation synchronous motor and a method for determining its structural parameters, in particular to a rotor of a high-speed secluded pole electric excitation synchronous motor with a sinusoidal distribution of an air gap magnetic field and a method for determining its structural parameters. Background technique [0002] In recent years, with the development and mutual penetration of electric motor technology, microelectronics technology, computer technology and control theory, compared with permanent magnet synchronous motors, electric excitation synchronous motors have been applied in Gas compressors, water pumps, high-speed blowers and high-speed wide-speed electric vehicles and other drive machinery. [0003] Commonly used electrically excited synchronous motor rotors have two structures: salient pole type and hidden pole type. The structure and manufacture of the salient pole type rotor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K19/02H02K15/02
Inventor 张琪黄苏融周翔谢国栋
Owner SHANGHAI UNIV
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