CN114552931A - Stator Yoke Permanent Magnet Dual Modulation Motor - Google Patents

Abstract

The invention discloses a stator yoke permanent magnet type double modulation motor, which includes a stator, a stator permanent magnet, a rotor permanent magnet, a rotor and a rotating shaft; the inner ring of the stator is provided with a rotor, and a mounting hole adapted to the rotating shaft is arranged in the rotor; The stator yoke is provided with stator permanent magnets with opposite magnetization directions, the rotor permanent magnets are evenly embedded in the rotor, and the magnetization directions are the same, a cavity is formed between the stator yoke and the stator teeth, which is used to set the three-phase armature winding, A cavity is formed between the stator yoke and the stator teeth, which is used to set the three-phase armature winding; this motor combines the traditional stator yoke permanent magnet motor and the rotor alternating pole permanent magnet motor, and inherits and integrates the advantages of the original motors. On the other hand, a stator yoke permanent magnet dual-modulation motor is formed, which realizes the air-gap magnetic field modulation effect, and can further improve the torque output capability of the motor.

Description

Stator Yoke Permanent Magnet Double Modulation Motor

technical field

The invention relates to the technical field of motors, in particular to a stator yoke permanent magnet type double modulation motor.

Background technique

In 1957, G. Kronacher of the General Electric Company of the United States first proposed a reluctance motor with a multi-tooth structure of the stator and rotor, and named it a vernier motor. Causes a large change in the magnetic field distribution. Vernier motors have been used in low-power applications such as money counters and fax machines due to their simple structure and low torque ripple. However, due to the relatively low torque density and power factor of the motor, which hinders its further industrial application, the related research on the reluctance motor based on the principle of magnetic field modulation has stalled. In 1999, Professor T.A.Lipo of the University of Wisconsin-Madison proposed a surface-mounted permanent magnet vernier (SPM Vernier, SPMV) motor. The torque equation was derived by the magnetomotive force-permeability method, and the motor modulation was theoretically confirmed. Harmonics cause a "torque magnification factor" in the torque equation and therefore a higher torque density. Therefore, the permanent magnet motor based on the magnetic field modulation effect has high torque density and is more suitable for low-speed and high-torque applications.

According to the setting position of the permanent magnet, the magnetic field modulation permanent magnet motor can be simply divided into the rotor permanent magnet type and the stator permanent magnet type. At present, the research of rotor and stator permanent magnet magnetic field modulation motors mainly focuses on the design of different permanent magnet structures (such as surface-mounted and built-in) and winding structures (concentrated winding and distributed), that is, by adjusting the excitation magnetomotive force (permanent Magnets and armature windings) distribution and air-gap permeance to enrich the harmonics of the air-gap magnetic field, thereby improving the torque performance of the motor. However, the traditional rotor and stator permanent magnet magnetic field modulation motors have problems such as more leakage of permanent magnets and limited torque capacity improvement, so their torque capacity cannot be fully explored.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problem of the above-mentioned background technology, and propose a stator yoke permanent magnet type double modulation motor, which inherits the respective advantages of the rotor and the stator permanent magnet type magnetic field modulation motor by better integration, and realizes bilateral permanent magnet excitation and double magnetic field. Modulation effect, thereby further improving the torque output capability of the motor.

The object of the present invention can be realized through the following technical solutions:

The stator yoke permanent magnet type double modulation motor includes a stator, a stator permanent magnet, a rotor permanent magnet, a rotor and a rotating shaft; the inner ring of the stator is provided with a rotor, and the rotor is provided with a mounting hole adapted to the rotating shaft;

The stator yoke of the stator is provided with stator permanent magnets with opposite magnetization directions, the rotor permanent magnets are evenly embedded in the rotor, and the magnetization directions are the same.

As a further solution of the present invention, the stator includes a stator yoke and stator teeth, and the inner ring of the stator yoke is provided with a plurality of stator teeth in an annular array.

As a further scheme of the present invention: the relationship between the stator permanent magnet pole pair number NsPM and the stator teeth Ns is:

As a further solution of the present invention, a cavity is formed between the stator yoke and the stator teeth for setting the three-phase armature winding.

As a further solution of the present invention, the rotor includes a rotor yoke and rotor teeth, and a plurality of rotor teeth are arranged in an annular array on the outer ring of the rotor yoke.

As a further solution of the present invention, the permanent magnets of the rotor and the modulation teeth of the rotor are alternately arranged, so that the outer ring part of the rotor forms a salient pole-like structure.

As a further solution of the present invention, the relationship between the rotor permanent magnet pole pair number NrPM and the rotor teeth Nr is: N _rPM =N _r .

Beneficial effects of the present invention:

This motor combines the traditional stator yoke permanent magnet motor and the rotor alternating pole permanent magnet motor, and on the basis of inheriting and integrating the advantages of their original motors, a stator yoke permanent magnet double modulation motor is formed to realize the air gap magnetic field modulation effect. , which can further improve the torque output capability of the motor;

This motor solves the problems of large magnetic leakage of permanent magnets and low utilization of permanent magnets caused by the unilateral air-gap magnetic field modulation effect of traditional stator yoke permanent magnet motors and rotor alternating-pole permanent magnet motors, thereby further enriching the work of air-gap magnetic fields. Harmonics, improve the utilization of permanent magnets;

This motor combines the traditional single-side (stator or rotor) permanent magnet motor, makes full use of the motor design space, and provides a solution for further improving the miniaturization and lightweight design of the motor.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

1 is a schematic diagram of a two-dimensional structure of a motor of the present invention;

Fig. 2 is the magnetic field line distribution diagram of the motor of the present invention (rotor position θ=0°);

FIG. 3 is a distribution diagram of magnetic lines of force of the motor of the present invention (rotor position θ=180°).

In the figure: 1, stator; 2, stator permanent magnet; 3, armature winding; 4, rotor permanent magnet; 5, rotor; 6, rotating shaft;

1.1, stator yoke; 1.2, stator teeth;

5.1. Rotor yoke; 5.2. Rotor modulation teeth.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Please refer to FIG. 1, the present invention is a stator yoke permanent magnet type double modulation motor, including a stator 1, a stator permanent magnet 2, an armature winding 3, a rotor permanent magnet 4, a rotor 5 and a rotating shaft 6; the inner ring of the stator 1 is provided with There is a rotor 5, the rotor 5 is provided with a mounting hole adapted to the rotating shaft 6, the stator 1 is provided with a stator permanent magnet 2, the stator permanent magnet 2 is provided in a plurality of annular arrays, and is located at the outer ring of the stator 1, The magnetization directions of the stator permanent magnets 2 are opposite; the rotor 5 is provided with rotor permanent magnets 4, and a plurality of the rotor permanent magnets 4 are arranged in an annular array and are located at the outer ring of the rotor 5. The magnetization of the rotor permanent magnets 4 the same direction;

The stator 1 includes a stator yoke 1.1 and stator teeth 1.2. The inner ring of the stator yoke 1.1 is provided with a plurality of stator teeth 1.2 in an annular array; the stator permanent magnet 2 is located on the stator yoke 1.1; The relationship between the teeth 1.2Ns is:

A cavity is formed between the stator yoke 1.1 and the stator teeth 1.2 for setting the three-phase armature winding 3;

The rotor 5 includes a rotor yoke 5.1 and rotor teeth 5.2. A plurality of rotor teeth 5.2 are arranged in an annular array on the outer ring of the rotor yoke 5.1; Salient pole structure, permanent magnets are installed on the stator 1 and rotor 5 sides, and there are salient pole modulation tooth structures on both the stator 1 and rotor 5 sides; _rPM =N _r ;

During operation, the present invention sets stator permanent magnets 2 with opposite magnetization directions in the stator yoke 1.1, and the rotor permanent magnets 4 are evenly embedded in the rotor 5, and the magnetization directions are the same, which can effectively enhance the magnetization effect of the permanent magnets. Improve the torque output capability of the motor; and permanent magnets are arranged on the stator 1 and rotor 5 sides, and there are salient-pole modulation tooth structures on both the stator 1 and rotor 5 sides, which can realize the double modulation effect of bilateral permanent magnets.

Example 2

2 and 3, the operating principle of the stator yoke permanent magnet double modulation motor involved in this implementation is: when the rotor position θ=0° (electrical angle), the magnetic field line starts from the stator permanent magnet 2 and passes through the stator 1.1 After reaching the stator tooth 1.2, it passes through the rotor permanent magnet 4, and then passes through the rotor modulation tooth 5.2 to form a closed magnetic circuit. At this time, the permanent magnetic flux linkage passes through the coil A1, and the flux linkage is the largest; at the rotor position θ=180°( Electric angle), the magnetic line of force starts from the stator permanent magnet 2, reaches the stator yoke 1.1 and enters the stator tooth 1.2, passes through the rotor modulation tooth 5.2 and then forms a closed loop through the adjacent rotor modulation tooth 5.2. At this time, the permanent magnetic flux linkage penetrates into Coil A1, the flux linkage is the smallest at this time. The above shows that when the rotor rotates for one electrical cycle, the induced permanent magnetic flux linkage induces alternating permanent magnetic flux linkage in the coil A1, thereby generating alternating induced electromotive force, thus realizing electromechanical energy conversion.

The working principle of the present invention: the stator permanent magnets 2 are arranged in the stator yoke 1.1, and the magnetizing directions of the adjacent permanent magnets are opposite; the rotor permanent magnets 4 and the rotor teeth are alternately arranged in the rotor, and the magnetizing directions of the rotor permanent magnets 4 are the same;

The stator 1 is arranged outside the rotor 5 and includes a stator yoke 1.1 and stator teeth 1.2, and the armature windings 3 are arranged in the cavity formed between the stator 1 and the rotor 5.

The stator permanent magnet 2 is arranged in the stator yoke 1.1, and the relationship between the number of pole pairs NsPM of the stator permanent magnet 2 and the stator teeth 1.2Ns is:

The rotor 5 is arranged inside the stator 1, the rotor permanent magnets 4 and the rotor teeth are arranged alternately, the rotor 5 side forms salient pole modulation teeth, and the relationship between the number of pole pairs NrPM of the rotor permanent magnet 4 and the rotor teeth 5.2Nr is:

N _rPM =N _r (2)

In the stator yoke permanent magnet type double modulation motor, permanent magnets are arranged on the rotor 5 and stator 1 sides, and both have a salient pole modulation tooth structure, so as to realize the double modulation effect of the air gap magnetic field.

An embodiment of the present invention has been described in detail above, but the content is only a preferred embodiment of the present invention, and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still belong to the scope of the patent of the present invention.

Claims (7)

1. a stator yoke permanent magnet type double modulation motor, characterized in that it comprises a stator (1), a stator permanent magnet (2), a rotor permanent magnet (4), a rotor (5) and a rotating shaft (6); The inner ring is provided with a rotor (5), and a mounting hole adapted to the rotating shaft (6) is provided in the rotor (5); The stator yoke (11) of the stator (1) is provided with stator permanent magnets (2) with opposite magnetization directions, and the rotor permanent magnets (4) are evenly embedded in the rotor (5) with the same magnetization directions. 2. The stator yoke permanent magnet type double modulation motor according to claim 1, wherein the stator (1) comprises a stator yoke (11) and stator teeth (12), and the inner ring of the stator yoke (11) is arranged in an annular array There are a plurality of stator teeth (12). 3. stator yoke permanent magnet type double modulation motor according to claim 1, is characterized in that, the relation between stator permanent magnet (2) pole pair number NsPM and stator tooth (12) Ns is:

4. The stator yoke permanent magnet type double modulation motor according to claim 2, characterized in that a cavity is formed between the stator yoke (11) and the stator teeth (12) for setting the three-phase armature winding (3) . 5. The stator yoke permanent magnet type double modulation motor according to claim 1, characterized in that the rotor (5) comprises a rotor yoke (51) and rotor teeth (52), and an annular ring is formed on the outer ring of the rotor yoke (51). The array is provided with a plurality of rotor teeth (52). 6. The stator yoke permanent magnet type double modulation motor according to claim 5, characterized in that the rotor permanent magnets (4) are alternately arranged with the rotor modulation teeth (52), so that the outer ring part of the rotor (5) forms a salient-like pole structure. 7. The stator yoke permanent magnet type double modulation motor according to claim 6, wherein the relationship between the number of pole pairs NrPM of the rotor permanent magnet (4) and the rotor teeth (52) Nr is: _NrPM = _Nr .

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