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Low-loss stator punching sheet of AC motor

A technology for punching AC motors and stators, which is applied to the static parts of the magnetic circuit, the shape/style/structure of the magnetic circuit, etc., which can solve the problems of large losses and achieve the effects of increased production costs, improved power factors, and good economic value

Active Publication Date: 2010-10-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the problem of large loss of the traditional AC motor, and provides the stator punching sheet of the AC motor which can significantly reduce the loss of the motor

Method used

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  • Low-loss stator punching sheet of AC motor
  • Low-loss stator punching sheet of AC motor
  • Low-loss stator punching sheet of AC motor

Examples

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Effect test

Embodiment 1

[0022] Taking the Y132S-4, 5.5kW motor as an example, its notch width is 3.5mm. After adopting this patent, the notch width is reduced from the original 3.5mm to 2.7mm. Through analysis, after the 5.5kW motor with a slot width of 3.5mm is changed to 2.7mm, it is not necessary to use a thinner wire. After modification, due to the smaller slot width, the air gap coefficient and equivalent air gap are correspondingly smaller, so that the power factor is increased by about one percentage point, the full load current is reduced accordingly, and the copper consumption of the stator is reduced by about 10W, and the harmonic field on the rotor surface is weakened. The additional iron loss on the surface of the rotor is reduced from the original 24W to about 15W. Overall, the total loss of the motor is reduced by about 20W, as shown in Table 1, Table 2 and Table 3 (in Tables 1-3, no-load iron loss and The full-load copper consumption is reduced by 18W, further considering that the redu...

Embodiment 2

[0032] Choose YX3-90S-6, 0.75kW motor, the stator notch width of the traditional groove type is 2.8mm, in the present invention, the notch width is reduced to 60% of the original, that is, changed from 2.8mm to 1.7mm. The motor was originally designed with a wire gauge of 0.75mm. After the improvement, in order to ensure that the cross-sectional area of ​​the wire remains unchanged, it is changed to two 0.53mm wires and wound together. The loss comparison between the two is shown in Table 4 and Table 5. After the improvement, the no-load loss can be reduced by 16. %, from 74W to 62W, the energy saving effect is remarkable. In this example, the notch width can also be reduced to 50% of the original, that is, from 2.8mm to 1.4mm. When inserting the wire, either the original 0.75mm single wire or two 0.53mm parallel wires can be used. The no-load loss data in this case is shown in Table 6, the loss value is reduced from 74W to 52W, and the energy saving effect is more significant...

Embodiment 3

[0041] Y225S-4, 37kW motor, the original notch width is 4mm, the improved notch width is 3.4mm (85% of the original), the original design wire gauge is 1.25mm, after the improvement is still not improved, it takes man-hours to manufacture the motor and Difficulty doesn't matter much, in this case the no-load loss is reduced by about 5%.

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Abstract

The invention belongs to the field of design and manufacture of the AC motor and particularly relates to a low-loss stator punching sheet of an AC motor. The structure provided by the invention is similar to that of the stator punching sheet of the conventional AC motor the power of which is between 0.55kW and 315kW, but the width of a stator rabbet of the low-loss stator punching sheet of the AC motor is 50 to 85 percent of that of the stator rabbet of the stator punching sheet for the same type of conventional AC motor. The improvement makes the stator rabbet narrowed and makes a tooth crest widened and correspondingly makes additional loss generated by a harmonic field on the surface of an rotor core and in the tooth crest region of the rotor obviously reduced. Moreover, an air gap coefficient is decreased, an effective air gap is correspondingly decreased, then a no-load current is reduced therewith, a power factor is also correspondingly improved in the full-load running process and a full-load current is increased, thus, copper loss and iron loss of the motor are reduced to achieve obvious energy-saving effect.

Description

technical field [0001] The invention belongs to the field of design and manufacture of AC motors, in particular to a low-loss AC motor stator punch. Background technique [0002] The notch of the stator core of the AC motor is for the convenience of inserting the wire and fixing the stator coil after inserting the wire. The slot width of semi-closed slots for 0.55kW~315kW AC motors at home and abroad is roughly from 2.2mm to 4.5mm. The mouth width is 4.5mm. This structure has been used for decades at home and abroad. On the one hand, with the advancement of insulating material technology and the improvement of the quality of stator punching, the insulation of the stator winding wire itself becomes thinner, and the thickness of the insulating paper of the same strength becomes thinner. , which makes it possible to put two parallel wires in a narrower slot; on the other hand, as users' requirements for energy efficiency increase, ultra-high-efficiency motors have stronger c...

Claims

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Application Information

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IPC IPC(8): H02K1/16
Inventor 赵海森罗应立刘晓芳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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