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A rotor structure, permanent magnet synchronous motor and compressor

A permanent magnet synchronous motor and rotor structure technology, applied in the direction of magnetic circuit shape/style/structure, magnetic circuit, electromechanical device, etc., can solve the problems of difficult to increase the working efficiency of the magnetic steel flux linkage motor and the high manufacturing cost of the motor, and achieve Effects of improving flux linkage and work efficiency, improving work efficiency, and reducing usage

Active Publication Date: 2018-12-28
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is that in the prior art, when the rotor structure of the permanent magnet motor does not increase the amount of magnet steel, it is difficult to increase the flux linkage of the magnet steel and then improve the working efficiency of the motor. When improving the working efficiency of the motor, it will lead to the problem of high manufacturing cost of the motor

Method used

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  • A rotor structure, permanent magnet synchronous motor and compressor
  • A rotor structure, permanent magnet synchronous motor and compressor
  • A rotor structure, permanent magnet synchronous motor and compressor

Examples

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Embodiment 1

[0046] This embodiment provides a rotor structure, such as image 3 As shown, it includes a rotor core 1 , a first magnet 3 and a second magnet 4 . Among them, the rotor core 1 has an inner hole 11 and six magnetic steel grooves 12 along its axial direction, and the six magnetic steel grooves 12 are symmetrically distributed around the outer circumference of the inner hole 11 in the rotor core 1; the first magnetic steel 3 Installed in the magnetic steel slot 12 at intervals with the second magnetic steel 4, the polarity of the first magnetic steel 3 is opposite to that of the adjacent second magnetic steel 4, and the first magnetic steel 3 and the second magnetic steel 4 adopt Made of the same material, for example, all adopt NdFeB, or ferrite, or other magnetic materials, the length of the first magnet 3 is less than the length of the second magnet 4, so that the magnetic flux of the second magnet 4 The ratio to the magnetic flux of the first magnet 3 is within a range grea...

Embodiment 2

[0057] This embodiment provides a rotor structure, such as Figure 6 , the difference from the rotor structure provided in Example 1 is only that the volume of the first magnet 3 is the same as that of the second magnet 4, the first magnet 3 is made of low grade magnets, and the second magnet 4 is made of high Brand of magnetic steel.

[0058] In this embodiment, by changing the grade of the magnets, the single-piece magnetic flux value is changed, so that the first magnets 3 under a pair of poles adopt low-grade magnets, and the residual magnetism of the low-grade magnets is small, and the first magnets 3 The magnetic flux of the second magnet 4 is reduced, and the second magnet 4 adopts a high-grade magnet, and its residual magnetism is large, so the magnetic flux of the second magnet 4 is increased, so that the ratio of the magnetic flux of the second magnet 4 to the magnetic flux of the first magnet 3 In the range of greater than 1 and less than 2.5, compared with the tra...

Embodiment 3

[0064] A permanent magnet synchronous motor provided in this embodiment includes a rotor structure, and the rotor structure is any one of the rotor structures provided in Embodiment 1 or Embodiment 2. The permanent magnet synchronous motor in this embodiment adopts the rotor structure in Embodiment 1 or Embodiment 2, so that the working point of the motor moves up, and the flux linkage of the motor is increased. When driving the same load, the rotor excitation field is more Larger, the smaller the stator armature current required, the smaller the stator copper loss, thereby improving the working efficiency of the motor; at the same time, reducing the use of magnetic steel and reducing the manufacturing cost of the motor.

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Abstract

The invention discloses a rotor structure, a permanent magnet synchronous motor and a compressor. The rotor structure comprises a rotor iron core, a first magnet and a second magnet. The rotor iron core comprises an inner bore and at least two and even numbered magnetic steel troughs in the axial direction. The magnetic steel troughs are symmetrically distributed around the periphery of the inner bore on the rotor iron core. The first magnet and the second magnet are spaced apart from each other in the magnetic steel troughs. The polarity of the first magnet is opposite to the polarity of the second magnet adjacent thereto. The ratio of the magnetic flux of the second magnet to the magnetic flux of the first magnet is greater than 1 and less than 2.5. The permanent magnet synchronous motor comprises the rotor structure. The compressor comprises the permanent magnet synchronous motor. Since the ratio of the magnetic flux of the second magnet to the magnetic flux of the first magnet is greater than 1 and less than 2.5, the working points of the magnets move up to increase the flux linkage of the motor. When the same load is driven, the excitation magnetic field of the rotor is larger, and the required stator armature current is smaller. The work efficiency of the motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a rotor structure, a permanent magnet synchronous motor and a compressor. Background technique [0002] The permanent magnet synchronous motor uses the electromotive force generated by the electromagnetic induction between the stator and the rotor to drive the load. With the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, the permanent magnet synchronous motor can be rapidly developed. Promote apps. For example, it is used in servo system, electric traction and other occasions. [0003] The structure of the rotor in the permanent magnet synchronous motor in the prior art is as follows figure 1 As shown, the rotor core 1 is included, and an even number of magnetic steel slots 12 are opened along its axial direction, and the magnetic steels 5 installed in the magnetic st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27
CPCH02K1/2766
Inventor 王晶肖勇张辉胡余生陈彬
Owner GREE ELECTRIC APPLIANCES INC
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