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Hybrid magnetic circuit low harmonic multi-stator field-weakening extended-speed permanent magnet synchronous motor and method thereof

A permanent magnet synchronous motor, field weakening speed expansion technology, applied in the direction of magnetic circuit, magnetic circuit rotating parts, magnetic circuit static parts, etc., can solve the problem of weakening cogging torque, increasing motor leakage flux, vibration and Noise and other problems, to reduce the radial main magnetic flux, increase the effect of speed regulation range

Active Publication Date: 2018-02-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The permanent magnet synchronous motor has a fixed permanent magnet magnetomotive force, and the main magnetic flux of the motor cannot be adjusted, resulting in a narrow constant power operating range and a wide range of speed regulation.
[0005] 2. In the existing built-in permanent magnet synchronous motor rotor structure, the permanent magnets of the rotor realize the "magnetism gathering effect" through various combinations, so the magnetic pole magnetic density of the rotor iron core is very high, so that there is a large leakage flux at the end, and the rotor The leakage flux is closed by the end of the motor rotor or the end cover. Since the total magnetic flux generated by the permanent magnet is constant, the existence of the leakage flux at the end not only makes the magnetic field distribution at the two ends of the motor uneven, but also reduces the effective flux of the motor. Utilization rate, thereby reducing the power density and torque density of the motor. In order to overcome the influence of the leakage flux at the end, the motor rotor often adopts an overhang structure in actual design, so that the axial length of the rotor core is greater than the axial length of the motor stator core. length, but this structure significantly increases the axial length of the motor, which in turn increases the amount of iron core material and manufacturing cost of the motor, and this structure does not essentially have the effect of suppressing the leakage flux at the end
[0007] 4. According to the different paths of the d-axis flux during field weakening, the existing permanent magnet synchronous motors with built-in rotor structure can be divided into two categories, one of which, when the field weakening control is performed, the d-axis generated by the armature winding The magnetic flux will pass through the permanent magnet of the motor, causing irreversible demagnetization of the permanent magnet. In the other category, when the field weakening control is performed, the d-axis magnetic flux generated by the armature winding is not closed by the permanent magnet, but the magnetic field generated by the d-axis current is forced More rotor flux closes through the ends of the motor and end caps, significantly increasing the leakage flux of the motor, and since the reluctance at the ends of the motor is usually much greater than the reluctance of the air gap, the required field weakening The d-axis current is high, which significantly increases the cost of the motor power inverter and the copper loss of the winding
[0008] 5. Existing permanent magnet synchronous motors usually have large armature back electromotive force harmonics and prominent cogging torque problems, which bring serious vibration and noise problems. At present, stator chute or rotor skew pole methods are usually used to improve back electromotive force. Electromotive force harmonics can weaken the cogging torque, but the processing technology of the stator chute and rotor slant pole is more complicated, which greatly increases the manufacturing cost, and will reduce the average electromagnetic torque of the motor to a certain extent, and reduce the torque density and power of the motor density

Method used

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  • Hybrid magnetic circuit low harmonic multi-stator field-weakening extended-speed permanent magnet synchronous motor and method thereof
  • Hybrid magnetic circuit low harmonic multi-stator field-weakening extended-speed permanent magnet synchronous motor and method thereof
  • Hybrid magnetic circuit low harmonic multi-stator field-weakening extended-speed permanent magnet synchronous motor and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061]As shown in Figure 1(a), the overall three-dimensional schematic diagram of the motor, the number of phases of the motor in this embodiment is 3, the number of radial stator teeth is 24, the number of axial stator teeth is 12, the number of rotor slots is 4, and the number of permanent magnet blocks is 4 , the number of radial magnetic poles is 4, and the number of axial magnetic poles is 4. This embodiment includes a radial stator, an axial stator and a rotor. As shown in Figure 1(b), the radial stator is made of laminated silicon steel sheets. The radial stator includes a radial stator tooth 1, a radial stator yoke 2 and a radial stator slot 3, and a radial armature winding 4 is placed in the radial stator slot 3, and the radial armature winding 4 can be a distributed winding, a concentrated winding or The number of poles of the radial armature winding is the same as the number of radial magnetic poles of the rotor, the radial stator and the rotor are coaxial, and there...

Embodiment 2

[0063] The main difference between embodiment 2 and embodiment 1 is:

[0064] (1) As shown in Figure 2(a), there are axial stators at both ends of the motor in Example 2, and the two ends of the rotor iron core of the motor are all processed into the shape of fan rings to form axial magnetic poles, The rotor is shown in Fig. 2(c), and in Embodiment 1, only one end of the motor has an axial stator, and only one end of the motor rotor iron core is processed into the shape of a fan ring to form an axial magnetic pole;

[0065] The motor in Embodiment 2 has two axial air gaps 10, as shown in Fig. 2(e).

[0066] (2) The arrangement of the permanent magnets in Example 2 is different from that in Example 1. The permanent magnets in Example 1 are in a single parallel structure, while in Example 2 the permanent magnets are in a series-parallel hybrid structure. The rest is the same as that of Example 1, as shown in Figure 2(b) and Figure 2(d).

[0067] Wherein, in the above-mentioned...

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Abstract

The invention discloses a hybrid magnetic circuit low harmonic wave multi-stator flux-weakening speed extension permanent magnet synchronous motor, and a method thereof. The hybrid magnetic circuit low harmonic wave multi-stator flux-weakening speed extension permanent magnet synchronous motor includes a radial stator, an axial stator and a rotor, wherein the rotor is arranged in the radial stator, and is arranged coaxially with the radial stator; the axial stator is arranged at the end part of the rotor, and is arranged concentrically with the rotor; permanent magnets are arranged in the rotor, and are used for generating radial magnetic poles and axial magnetic poles; one part of the magnetic flux generated from each permanent magnet enters the corresponding radial stator through the corresponding radial magnetic pole and then forms a radial main magnetic flux with a radial armature winding crosslink; the other part of the magnetic flux generated from the permanent magnet enters the axial stator through the axial magnetic pole, and then forms an axial main magnetic flux with an axial armature winding crosslink; and the radial main magnetic flux is connected with the axial magnetic flux in parallel. The hybrid magnetic circuit low harmonic wave multi-stator flux-weakening speed extension permanent magnet synchronous motor, and the method thereof have the advantages of eliminating the magnetic leakage effect of the end part, improving the utilization rate of the motor material, reducing the weight of the motor, improving the power density, flexibly realizing magnetic enhancing operation and flux-weakening speed extension operation, and widening the economic operation range of the motor.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a mixed magnetic circuit low-harmonic multi-stator weak field speed-expanding permanent magnet synchronous motor and a method thereof. Background technique [0002] In recent years, with the improvement of high temperature resistance and price reduction of permanent magnet materials, permanent magnet motors have been more widely used in national defense, industrial and agricultural production, and daily life, and are moving towards high power, high performance and miniaturization. direction of development. At present, the power of permanent magnet motors ranges from a few milliwatts to several thousand kilowatts, and its application ranges from toy motors, industrial applications to large permanent magnet motors for ship traction, and has been widely used in various aspects of the national economy, daily life, military industry, and aerospace. widely used. [0003] The ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K16/04H02K1/27H02K1/16
CPCH02K1/16H02K1/276H02K16/04
Inventor 王道涵
Owner SHANDONG UNIV
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