Novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation

A permanent magnet synchronous motor and stator structure technology, which is applied in the magnetic circuit shape/style/structure, electrical components, electromechanical devices, etc. Difficulty in heat conduction and other problems, to achieve the effect of improving thermal conductivity, reducing the distortion rate of air gap magnetic density, and increasing the number of slots

Pending Publication Date: 2021-08-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the integer slot motor, the magnetic field of the fractional slot concentrated winding motor contains rich harmonics, especially low-order tooth harmonics, which will increase the cogging torque of the motor, increase the motor loss, and increase the noise; in addition, the fractional slot concentrated winding motor The small number of slots and the large slot area lead to difficulties in heat conduction in the stator slots, resulting in overheating of the motor, thus affecting the safe and reliable operation of the permanent magnet motor system

Method used

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  • Novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation
  • Novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation
  • Novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation

Examples

Experimental program
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Effect test

Embodiment 1

[0042] see figure 1 and figure 2 , a new type of permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation. The stator is composed of two parts: stator core and concentrated winding. The stator core includes open stator teeth 1 and stator yoke 4; the stator winding is a fraction with a span of 1 Slot concentrated winding; M auxiliary slots 2 are opened on the tooth crown of each stator tooth 1; a heat conducting rod 3 with good thermal conductivity is inserted into each stator slot.

[0043] The new permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation in this embodiment can not only weaken the tooth harmonics, reduce torque ripple and vibration noise, improve torque quality, but also reduce the temperature rise of the motor and improve the thermal conductivity of the motor. This increases the power / torque density of the motor.

Embodiment 2

[0045] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0046]The auxiliary slots 2 on the crown of the stator tooth 1 are as follows: taking the neutral line of the stator tooth 1 as the reference, the auxiliary slots 2 are evenly distributed on the stator crown, and the number M of auxiliary slots 2 on each stator tooth 1 should satisfy M+2≠tN p , t is any positive integer, p is the number of pole pairs, Q is the number of slots; the shape of the auxiliary slot is a rectangular slot, or a pear-shaped slot, or a half-pear-shaped slot, or a circular slot; after the auxiliary slot 2 is opened, each stator tooth 1 forms M+1 A small tooth crown 5.

[0047] The inserted heat conducting rod 3 is:

[0048] (a) The heat conduction rod 3 is made of high thermal conductivity material;

[0049] (b) Its bottom end is to be connected with the stator yoke 4;

[0050] (c) The top, that is, the surface of each heat conducting rod 3 shoul...

Embodiment 3

[0055] This example is a 36-slot 48-pole motor that adopts the new permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation of the present invention, see figure 2 , its stator features and its implementation steps are:

[0056] (1) Determine the stator structure: the stator is composed of two parts: the stator core and the concentrated winding. The stator core includes the stator teeth 1 with the auxiliary slot 2, the stator yoke 4 and the heat conduction rod 3. It is characterized in that:

[0057] (a) The winding method of the stator winding is a fractional slot concentrated winding with a span of 1;

[0058] (b) M auxiliary slots 2 are opened on each stator tooth 1;

[0059] (c) A thermally conductive rod 3 with good thermal conductivity is inserted into each stator slot.

[0060] (2) Open auxiliary slot 2 on each stator tooth 1:

[0061] (a) Determine the number M of auxiliary slots: its cogging torque N p =4>1, M should sat...

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Abstract

The invention relates to a novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation. For a fractional slot concentrated winding permanent magnet synchronous motor stator, M auxiliary slots with the same shape and the same size are formed in each stator tooth, and the auxiliary slots are uniformly distributed on the stator teeth by taking a stator tooth neutral line as a reference; the bottom end of the high-thermal-conductivity thermal conduction rod is connected with the slot bottom, and the shape and the outer radius of the top end are the same as those of the small tooth crowns of the stator with the auxiliary slots, and the thermal conduction rod is inserted to each stator slot. The addition of the auxiliary slots and the thermal conduction rods is equivalent to the increase of the number of the slots, the cogging relation of a prototype machine is changed, the fundamental wave period number of cogging torque is increased, the amplitude of the total cogging torque is reduced, and torque pulsation, vibration noise and loss are effectively reduced. And meanwhile, the thermal conduction rods are inserted into the stator slots to reduce the temperature rise of the fractional-slot concentrated winding and improve the thermal conduction capability of the motor, so that the motor can operate safely and reliably.

Description

technical field [0001] The invention relates to a novel stator structure of a fractional slot concentrated winding permanent magnet synchronous motor and a parameter determination method thereof, in particular to a novel permanent magnet synchronous motor stator structure with high thermal conductivity and low pulsation. Background technique [0002] In recent years, permanent magnet synchronous motors with concentrated windings with fractional slots have been widely used in the fields of ships, aviation, and electric vehicles due to their advantages of short winding ends, high slot fullness, high torque density, and high efficiency. Compared with the integer slot motor, the magnetic field of the fractional slot concentrated winding motor contains rich harmonics, especially low-order tooth harmonics, which will increase the cogging torque of the motor, increase the motor loss, and increase the noise; in addition, the fractional slot concentrated winding motor The small numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/14H02K9/22
CPCH02K1/14H02K9/22H02K2213/03
Inventor 张琪李易泽黄苏融曾希圣
Owner SHANGHAI UNIV
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