CN110086276A - A kind of magneto and its rotor - Google Patents

Abstract

The invention discloses a rotor, which comprises a rotor iron core with a magnetic pole slot; a starting bar arranged around the rotor iron core to generate an asynchronous torque when starting; wherein, the center of the magnetic pole slot is provided with a A magnetically conductive part that moves radially along the rotor core; an elastic part that is arranged in the magnetic pole slot and abuts against the magnetically conductive part to generate elastic force to balance the centrifugal force of the magnetically conductive part; The permanent magnets are arranged in the magnetic pole slots and arranged on both sides of the magnetic conduction part respectively, and are used to generate braking torque when starting and generate electromagnetic torque when in a steady state. The above-mentioned rotor can reduce the braking torque in the starting process, solve the problem of low starting performance of the permanent magnet motor, and can also improve the steady-state operation performance of the permanent magnet motor. In addition, the invention also discloses a permanent magnet motor comprising the above-mentioned rotor.

Description

A permanent magnet motor and its rotor

technical field

The invention relates to the technical field of motors, in particular to a rotor. In addition, the present invention also relates to a permanent magnet motor comprising the above-mentioned rotor.

Background technique

Compared with induction motors, permanent magnet motors have the advantages of high efficiency, high power factor, and wide economical operating range. Under the trend of energy saving and emission reduction, these advantages make permanent magnet motors have broad development prospects. At present, the permanent magnet motor gradually reaches the steady-state operation condition through asynchronous starting. The rotor of the permanent magnet motor is equipped with magnets or other permanent magnets. These magnets generate braking rotation during the asynchronous starting process of the motor. The torque will hinder the rotation of the rotor, thereby reducing the starting performance of the motor.

Therefore, how to improve the starting performance of the permanent magnet motor is a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a rotor, which can reduce the braking torque in the starting process, solve the problem of low starting performance of the permanent magnet motor, and can also improve the steady-state running performance of the permanent magnet motor. Another object of the present invention is to provide a permanent magnet motor comprising the above rotor.

In order to achieve the above object, the present invention provides a rotor, including: a rotor core with magnetic pole slots; a starting guide bar arranged around the rotor core to generate asynchronous torque when starting; wherein, the magnetic pole slots A magnetically permeable part is provided at the center of the rotor core to move radially along the rotor core; it is arranged in the magnetic pole slot and abuts against the magnetically permeable part to generate elastic force to balance the elasticity of the centrifugal force of the magnetically permeable part part; a permanent magnet arranged in the magnetic pole slot and separately arranged on both sides of the magnetic conduction part to generate braking torque when starting and generate electromagnetic torque when in a steady state.

Preferably, the rotor core has an even number of the magnetic pole slots, and all the magnetic pole slots are evenly distributed along the circumferential direction of the rotor core.

Preferably, the outer circumference of the rotor core has a plurality of rotor teeth; wherein, all the rotor teeth are evenly distributed, and a rotor for setting the starting bar is formed between any two adjacent rotor teeth. groove.

Preferably, the starting guide bar is specifically a cast aluminum guide bar.

Preferably, the magnetic permeable part is made of laminated rectangular silicon steel sheets.

Preferably, the elastic part is specifically a spring.

Preferably, the magnetic pole slot has: a positioning slot for setting the elastic part; a positioning slot for setting the magnetic conducting part and allowing the magnetic conducting part to move centrifugally along the radial direction of the rotor core when starting Magnetic groove; respectively used to set the first installation groove and the second installation groove of the permanent magnets on both sides of the magnetic conduction part; wherein, the positioning groove, the first installation groove and the second installation groove All three are in communication with the magnetic conduction groove; the first installation groove and the second installation groove are arranged symmetrically with respect to the magnetic conduction groove; the positioning groove is farther away from the rotor core than the magnetic conduction groove center setting.

Preferably, the magnetic pole slot is V-shaped, and the opening of the magnetic pole slot faces the outer peripheral direction of the rotor core; wherein, the magnetically conductive part and the elastic part are arranged at a turning point of the magnetic pole slot.

Preferably, the magnetic pole slots are linear.

Compared with the above-mentioned background technology, the rotor provided by the present invention improves the starting performance of the permanent magnet motor by increasing the flux leakage between the permanent magnets on both sides of the magnetic conducting part and the elastic part during the starting process. Specifically, in the process of starting, the magnetic conduction part can increase the amount of magnetic flux leakage between the permanent magnets located in the same magnetic pole slot and separately arranged on both sides of the magnetic conduction part, so as to reduce the magnetic flux emitted by the permanent magnets, and further make the space The load back EMF is reduced, correspondingly the braking torque generated by the permanent magnet is reduced, and the asynchronous torque generated by the starting guide bar is not affected by the magnetic flux leakage, which finally improves the starting performance of the permanent magnet motor.

The present invention also provides a permanent magnet motor, comprising a stator and a stator winding disposed on the stator for generating an alternating magnetic field, and further comprising a rotor as described in any one of the above described stators disposed in the stator.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic cross-sectional view of the first rotor provided by the present invention;

Fig. 2 is a schematic cross-sectional view of the rotor core in Fig. 1;

Fig. 3 is a schematic diagram of the force of the magnetic conducting part provided by the present invention during the starting process;

Fig. 4 is a schematic cross-sectional view of the second rotor provided by the present invention;

Fig. 5 is a schematic cross-sectional view of the rotor core in Fig. 4;

Fig. 6 is a schematic cross-sectional view of a third rotor core provided by the present invention;

in,

1-rotor core, 11-rotor teeth, 12-rotor slot, 2-magnetic pole slot, 21-positioning slot, 22-magnetic slot, 23-first installation slot, 24-second installation slot, 3-magnetic slot part, 4-elastic part, 5-permanent magnet, 51-the first magnet, 52-the second magnet.

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, but 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.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 6, Figure 1 is a schematic cross-sectional view of the first rotor provided by the present invention; Figure 2 is a schematic cross-sectional view of the rotor core in Figure 1; Figure 4 is a schematic cross-sectional view of the second rotor provided by the present invention; Figure 5 is a schematic cross-sectional view of the rotor core in Figure 4; Figure 6 is a schematic cross-sectional view of the third rotor core provided by the present invention cross-sectional schematic diagram.

A rotor provided by the present invention, as shown in FIG. 1 to FIG. 6 , includes: a rotor core 1 and a starting guide bar (not shown) arranged on the outer periphery of the rotor core 1 . Wherein, the starting guide bar can provide the rotor core 1 with asynchronous torque for driving when the permanent magnet motor starts asynchronously.

As shown in Fig. 1, Fig. 2 and Fig. 4 to Fig. 6, the rotor core 1 is provided with a magnetic pole slot 2, and the magnetic pole slot 2 is used to arrange a permanent magnet 5 made of a magnet or an alnico alloy, and the permanent magnet 5 is preferably a magnetic steel commonly used in this technical field. These permanent magnets 5 are used to provide the rotor core 1 with a driving electromagnetic torque when the rotor core 1 reaches the rated speed. However, these permanent magnets 5 During the process, a braking torque will be generated that limits the speed of the rotor core 1, that is, the direction of the braking torque is opposite to that of the above-mentioned asynchronous torque, but its value is smaller than the magnitude of the asynchronous torque, which is not conducive to the rotation of the rotor core. 1, resulting in poor starting performance of the permanent magnet motor.

In order to improve the starting performance of the permanent magnet motor, as shown in Fig. 1, Fig. 3 and Fig. 4, a magnetic conducting part 3 and an elastic part 4 are arranged at the center of the magnetic pole slot 2, that is, the permanent magnet 5 in the above-mentioned magnetic pole slot 2 (That is, magnetic steel) are separately provided on both sides of the magnetic permeable part 3 . For ease of description, as shown in FIG. 1 and FIG. 3 , the magnet on one side of the magnetic permeable part 3 is called the first magnet 51 , and the magnet on the other side of the magnetic permeable part 3 is called the second magnet 52 .

It should be noted that the "center" here refers to the symmetrical center of the magnetic pole slot 2; Steel does not mean that the first magnet 51 and the second magnet 52 are only a whole piece of magnet, the first magnet 51 and the second magnet 52 can also be an aggregate of multiple magnets, as shown in FIG. 6 For example, the magnetic pole slot 2 will be divided into two parts by the magnetic conductive part 3, and the two parts are in a bent shape. In order to avoid increasing the difficulty of manufacturing the magnetic steel, it is necessary to set two straight lines at each part. shaped magnets.

The above-mentioned magnetically conductive part 3 can generate centrifugal force with the rotation of the rotor core 1 and move along the radial direction of the rotor core 1. Its function is to increase the magnetic flux leakage between the first magnetic steel 51 and the second magnetic steel 52, and then The magnetic flux emitted by the first magnetic steel 51 and the second magnetic steel 52 is reduced. The elastic part 4 abutting against the magnetically permeable part 3 can adjust the position of the magnetically permeable part 3 in the magnetic pole slot 2 along the radial direction of the rotor core 1 according to the rotational speed of the rotor core 1, so as to adjust the second position according to the rotational speed of the rotor core 1. Magnetic flux leakage between the first magnetic steel 51 and the second magnetic steel 52 .

Specifically, when the rotor core 1 rotates, the magnetically conductive part 3 will receive centrifugal force and compress the elastic part 4, and the elastic part 4 will undergo elastic deformation to generate an elastic force that can balance the above centrifugal force. , the greater the centrifugal force received by the magnetic permeable part 3, the elastic deformation of the elastic part 4 will also increase, and the magnetic permeable part 3 will gradually move away from the center of the rotor core 1, so that the magnetic permeable part 3 is aligned with the first magnetic steel 51. The magnetic conduction effect of both the first magnetic steel 51 and the second magnetic steel 52 is reduced, thereby gradually reducing the flux leakage between the first magnetic steel 51 and the second magnetic steel 52. When the speed of the rotor core 1 reaches the rated speed, The magnetic conduction part 3 reaches the limit position, so that the above-mentioned flux leakage amount reaches the minimum value.

In the following, the force of the above-mentioned magnetically permeable part 3 will be described in detail by using relevant formulas of physics.

The expression of the centrifugal force F1 received by the magnetic conducting part 3 as the rotor core ₁ rotates is:

F ₁ = Mω ² r

And the expression of the rebound force F of the magnetic permeable part 3 by the elastic part 4 is:

F=kx

In the formula, M is the mass of the magnetic permeable part 3, ω is the rotational angular velocity of the magnetic permeable part 3, r is the distance from the magnetic permeable part 3 to the center of the rotor core 1 along the radial direction of the rotor core 1, and k is the elastic part 4 The coefficient of elasticity, x is the amount of deformation of the elastic part 4.

As shown in Figure 3, during the starting process, the angular velocity ω of the magnetically permeable part 3, which is regarded as the same rotating body as the rotor core ₁ , gradually increases, and the centrifugal force F1 gradually increases, and then compresses the elastic part 4 to generate a Elastic deformation for the elastic part 4 to produce _a rebound force F opposite to the direction of the centrifugal force F1, so that the magnetic conducting part 3 moves centrifugally with the contraction of the elastic part 4. When the rotor core 1 reaches the rated speed and is stable, the centrifugal force F ₁ reaches the maximum value, so that the deformation x of the elastic part 4 reaches the maximum value, and then the position of the magnetic permeable part 3 remains fixed.

The technical solution provided by the present invention will be described in detail below using relevant formulas of electromechanical science.

The expression of the asynchronous torque T _c produced by the above-mentioned starting guide bar during the asynchronous starting process is:

The expression of the braking torque T _g produced by the above-mentioned permanent magnet 5 in the asynchronous starting process is:

In the formula, m is the number of phases, p is the number of pole pairs, f is the rated frequency, s is the slip, c ₁ is the correction coefficient, R ₂ ' is the converted value of the rotor resistance, X ₂ ' is the converted value of the rotor leakage reactance, R ₁ is the stator resistance, X ₁ is the stator leakage reactance, X _q is the quadrature axis synchronous reactance, X _d is the direct axis synchronous reactance, U is the applied voltage, E ₀ is the no-load back EMF.

The expression of the no-load back electromotive force E0 in the expression of the braking torque T _g is _:

E ₀ ＝4.44fK _dp NΦ _δ K _Φ

In the formula, K _dp is the winding factor, N is the number of series turns of each phase winding, Φ _δ is the no-load main magnetic flux, K _Φ is the air-gap magnetic flux waveform coefficient, and other unexplained letter parameters refer to the above formula The corresponding relationship will not be repeated here.

It can be seen that during the starting process of the permanent magnet motor (0<slip s<1), the magnitude of the braking torque T _g is proportional to E ₀ ² (that is, the square of the no-load back EMF), while the asynchronous motor The torque _Tc has nothing to do with the size of the no-load back EMF E0 _; in other words, the greater the _no -load back EMF E0, the greater the degree of hindrance to starting, so it is necessary to reduce the no-load back EMF _E0 to improve the permanent magnet motor starting performance.

According to the above description, in the process of asynchronous starting, the magnetic permeable part 3 can increase the flux leakage between the first magnet 51 and the second magnet 52, so that the first magnet 51 and the second magnet 52 The no-load main magnetic flux Φ _δ emitted decreases, and then the no-load back electromotive force _E0 decreases, so as to reduce the limiting effect of the braking torque on the rotor core 1 to increase the speed, and finally achieve the goal of improving the starting performance of the permanent magnet motor Purpose.

It should be noted that as the rotation speed of the rotor core 1 gradually increases, a gradually widening air magnetic isolation bridge is formed between the first magnetic steel 51 and the second magnetic steel 52 and the magnetic permeable part 3 . Wherein, the magnetic permeability of the air magnetic isolation bridge is lower than the magnetic permeability of the magnetic permeable part 3, which can reduce the magnetic leakage amount of the first magnetic steel 51 and the second magnetic steel 52, and as the width of the air magnetic isolation bridge increases, The smaller the magnetic leakage amount between the first magnetic steel 51 and the second magnetic steel 52, although it will gradually increase the no-load main magnetic flux Φ _δ , but compared with the magnetic conduction part 3 and the elastic part 4, the present In the technical solution, the value of the no-load back electromotive force E ₀ is still small, which is still beneficial to the starting of the permanent magnet motor. That is to say, at the beginning of starting, the magnetically conductive part 3 and the elastic part 4 have the best effect on improving the starting performance of the permanent magnet motor, and improve the starting success rate of the permanent magnet motor. As the speed of the rotor core 1 gradually increases, The boosting effect gradually decreases, but still has a favorable effect on the starting performance until the rotor core 1 reaches the rated speed.

When the rotor core 1 reaches the rated speed (slip s = 0), according to the above formula, it can be known that the asynchronous torque T _c = 0, that is, the starting bar no longer plays a driving role, and the electromagnetic force generated by the permanent magnet 5 in the magnetic field The torque T _em drives the rotor core 1 to keep rotating at the rated speed, and the expression of the electromagnetic torque T _em is specifically:

In the formula, ω _s is the synchronous electrical angular velocity, and θ is the power angle. For other unexplained letter parameters, please refer to the corresponding relationship in the above formula, and will not repeat them here.

It can be seen that during the steady-state operation of the permanent magnet motor, the electromagnetic torque T _em is positively correlated with the no-load back EMF E ₀ , that is, if the no-load back EMF E ₀ is larger, the electromagnetic torque T _em The larger is, the more favorable it is for the traction iron core rotor to rotate at the rated speed, so it is necessary to increase the no-load back EMF E ₀ to improve the steady-state operation performance of the permanent magnet motor.

According to the above expression, when the rotational speed of the rotor core 1 reaches the rated rotational speed, the magnetically conductive part 3 reaches the limit position, thereby forming an air magnetic isolation bridge with a maximum width between the first magnetic steel 51 and the second magnetic steel 52 , and at the same time make the magnetic conduction part 3 play a smaller magnetic conduction effect between the first magnet 51 and the second magnet 52, so that the no-load main magnetism emitted by the first magnet 51 and the second magnet 52 Through the increase of Φ _δ , the no-load back electromotive force E ₀ increases, and finally achieves the purpose of improving the steady-state operation performance of the permanent magnet motor.

It should be noted that the sources of the above three torque expressions refer to "Design and Simulation Analysis of 5.5kW Asynchronous Start Permanent Magnet Synchronous Motor" published by Du Haitang and "Research on High Performance Asynchronous Start Permanent Magnet Synchronous Motor" published by Ruan Tianhu and Design" these two papers; if there are places in the above description that have not been explained in detail, please refer to the content of the above two documents, and will not repeat them here.

In summary, the magnetically conductive part 3 and the elastic part 4 can improve the starting performance and steady-state operation performance of the permanent magnet motor. In other words, the core of this technical solution is to set the magnetically conductive part 3 and the elastic part in the magnetic pole slot 2 4. Make the rotor balance the centrifugal force F ₁ received by the magnetic permeable part 3 through the elastic part 4, and then the magnetic permeable part 3 moves with the elastic deformation of the elastic part 4, so as to realize the increase of the first magnetic steel 51 and the second magnetic steel 51 during the starting process. The amount of magnetic leakage between the two magnetic steels 52 is reduced, and the amount of magnetic leakage between the first magnetic steel 51 and the second magnetic steel 52 can be reduced during steady state operation.

It should be understood that the permanent magnets 5 (that is, the magnetic steel) in the magnetic pole slot 2 are all magnetic steel with N poles and S poles, and the N poles and S poles are respectively facing the magnetic pole slot 2 along the radial direction of the rotor core 1. On both sides, and in any adjacent two pole slots 2, the permanent magnets 5 are set in the opposite way, that is, the N pole of the permanent magnet 5 in one of the pole slots 2 faces the center of the rotor core 1, while the other pole slot 2 The S pole of the inner permanent magnet 5 faces the center of the rotor core 1 .

What needs to be added is that the flux leakage between the first magnetic steel 51 and the second magnetic steel 52 in the same magnetic pole groove 2 is from one of the permanent magnets 5 (the first magnetic steel 51 or the second magnetic steel 52) The N pole of the permanent magnet passes through the magnetic conducting part 3 to reach the S pole of another permanent magnet 5 (the second magnet 52 or the first magnet 51), wherein, in the process of permanent magnet asynchronous starting and steady-state operation, the above-mentioned After passing through the magnetic conduction part 3 from the N pole, the magnetic force line needs to pass through the air magnetic isolation bridge and then reach the S pole.

According to the common sense of electromechanical science, the magnetic poles in the motor appear in pairs, so the magnetic poles in the motor are all even numbers. Therefore, the magnetic pole slots 2 for accommodating the permanent magnets 5 should also be provided with an even number of magnetic poles, that is, magnetic poles. The number of slots 2 can be set to two, four, six or other even numbers; and for the smooth rotation of the rotor core 1 , all magnetic pole slots 2 are evenly distributed along the circumference of the rotor core 1 . Preferably, as shown in FIG. 2 , FIG. 5 and FIG. 6 , the rotor core 1 is provided with four magnetic pole slots 2 .

In order to install the starting bar, as shown in Figures 1 to 6, there are a plurality of rotor teeth 11 on the outer periphery of the rotor core 1, wherein all the rotor teeth 11 are evenly distributed, so that any two adjacent rotor teeth 11 Rotor slots 12 of the same size are formed between them, and the rotor slots 12 are used to place the starting guide bars, so that the traction force of the starting guide bars acts on the rotor teeth 11 to drive the rotor core 1 to rotate.

It should be noted that, according to common sense, the rotor core 1 should be made of laminated silicon steel sheets; the above-mentioned starting guide bar is preferably a cast aluminum guide bar, and the structure and functional principles of the cast aluminum guide bar refer to the prior art, here No longer.

In order to avoid the eddy current phenomenon in the magnetic field of the magnetic conducting part 3, the magnetic conducting part 3 is preferably laminated by rectangular silicon steel sheets; Made of materials with poor magnetic permeability such as copper.

Here, the following specific implementation methods are provided for the structure of the magnetic pole slot 2:

As shown in FIG. 2 , FIG. 5 and FIG. 6 , the magnetic pole slot 2 has: a positioning slot 21 , a magnetic guiding slot 22 , a first installation slot 23 and a second installation slot 24 . The magnetically permeable groove 22 is used to place the magnetically permeable part 3, and the width of the magnetically permeable groove 22 along the radial direction of the rotor core 1 should be greater than the width of the magnetically permeable part 3 along the radial direction of the rotor core 1, so as to realize the asynchronous start When the magnetic conduction part 3 can move centrifugally in the magnetic conduction groove 22, an air magnetic isolation bridge is formed between the magnetic conduction part 3 and the inner surface of the magnetic conduction groove 22 close to the center of the rotor core 1; the positioning groove 21 is used to place the elastic Part 4; the first mounting groove 23 and the second mounting groove 24 are respectively provided on both sides of the magnetic permeable groove 22, and are respectively used to place the above-mentioned first magnetic steel 51 and second magnetic steel 52.

It should be noted that the above-mentioned first installation groove 23 and second installation groove 24 should be arranged symmetrically with respect to the magnetic conduction groove 22, so as to ensure the smooth rotation of the rotor core 1; Centrifugal force, the positioning groove 21 should be set farther away from the center of the rotor core 1 than the magnetic conducting groove 22, and in order to realize the elastic part 4 and the magnetic conducting part 3, the positioning groove 21 should communicate with the magnetic conducting groove 22 for the magnetic conduction The part 3 compresses the elastic part 4; for the convenience of production and manufacture, the first installation groove 23 and the second installation groove 24 are both connected with the magnetic conduction groove 22 .

Preferably, when the rotor core 1 reaches the rated speed, the magnetically permeable part 3 is in contact with the outer edge surface of the magnetically permeable groove 22, so as to prevent the magnetically permeable part 3 from being subjected to excessive centrifugal force and excessively compress the elastic part 4, thereby improving the elasticity Service life of part 4.

Further preferably, as shown in FIGS. 1 to 6 , a positioning step for fixing the first magnetic steel 51 is provided between the above-mentioned first installation groove 23 and the magnetic permeable groove 22 , so that the first magnetic steel 51 abuts against the The positioning step realizes the installation and positioning of the first mounting groove 23 to the first magnetic steel 51; similarly, a positioning step for fixing the second magnetic steel 52 is also provided between the second mounting groove 24 and the magnetic groove 22. .

The following two specific implementations are provided here for the shape of the magnetic pole slot 2:

In the first specific embodiment, as shown in Figures 1 to 3, the cross section of the magnetic pole groove 2 is V-shaped, that is, the above-mentioned first installation groove 23 and the second installation groove 24 are both linear and have a certain clamping shape. Angle setting (excluding the case where the two are parallel or collinear), and the magnetic permeable slot 22 is set as the bottom end of the V-shaped opening and is set close to the center of the rotor core 1, that is, the opening of the magnetic pole slot 2 should face the rotor core 1 for the peripheral direction setting.

In other words, the magnetic guiding groove 22 and the positioning groove 21 serve as turning points of the V-shaped magnetic pole groove 2 , while the first installation groove 23 and the second installation groove 24 serve as two ends of the V-shaped magnetic pole groove 2 .

In the second specific embodiment, as shown in FIG. 4 and FIG. 5 , the cross section of the magnetic pole groove 2 is linear, that is, the above-mentioned first installation groove 23 and the second installation groove 24 are collinearly arranged, and the magnetic conduction groove 22 and the second installation groove 24 are collinearly arranged. The positioning slot 21 is located between the first installation slot 23 and the second installation slot 24 .

It should be noted that the cross section of the magnetic pole slot 2 can also be in other opening shapes, such as the bowl shape shown in Figure 6, but in order to prevent the magnetic field generated by the permanent magnet 5 from passing through the rotor core 1, the rotor core 1 cannot rotate. , the opening of the magnetic pole slot 2 should be set towards the outer periphery of the rotor core 1 .

A permanent magnet motor provided by the present invention includes a stator and a stator winding, the stator winding is wound on the stator and is used to generate an alternating magnetic field, the permanent magnet motor also includes a rotor as described above located in the stator; and the stator, The structure and functional principles of the stator winding and other parts of the permanent magnet motor can refer to other parts, and this article will not expand.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such relationship between these entities. Actual relationship or sequence.

The permanent magnet motor and its rotor provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A rotor, characterized in that, comprising: a rotor core (1) with magnetic pole slots (2); a starting bar arranged around said rotor core (1) for generating asynchronous torque when starting; wherein, The center of the magnetic pole slot (2) is provided with a magnetic conducting part (3) for radially moving along the rotor core (1); An elastic part (4) arranged in the magnetic pole groove (2) and opposed to the magnetic conduction part (3) to generate elastic force to balance the centrifugal force of the magnetic conduction part (3); The permanent magnets (5) arranged in the magnetic pole slot (2) and separately arranged on both sides of the magnetic conduction part (3) are used to generate braking torque when starting and generate electromagnetic torque when in a steady state. 2. The rotor according to claim 1, characterized in that, the rotor core (1) has an even number of the magnetic pole slots (2), and all the magnetic pole slots (2) are along the rotor core ( 1) Evenly distributed in the circumferential direction. 3. The rotor according to claim 1, characterized in that, the outer circumference of the rotor core (1) has a plurality of rotor teeth (11); wherein, all the rotor teeth (11) are evenly distributed, and any phase A rotor slot (12) for setting the starting bar is formed between two adjacent rotor teeth (11). 4. The rotor according to claim 3, wherein the starting guide bar is specifically a cast aluminum guide bar. 5. The rotor according to claim 1, characterized in that, the magnetic permeable part (3) is made of laminated rectangular silicon steel sheets. 6. The rotor according to claim 4, characterized in that, the elastic part (4) is specifically a spring. 7. The rotor according to any one of claims 1 to 6, characterized in that, the magnetic pole slots (2) have: A positioning groove (21) for setting the elastic part (4); A magnetic permeable slot (22) for setting the magnetic permeable part (3) and allowing the magnetic permeable part (3) to move centrifugally along the radial direction of the rotor core (1) when starting; The first installation groove (23) and the second installation groove (24) are respectively used to set the permanent magnets (5) on both sides of the magnetic conduction part (3); wherein, All three of the positioning groove (21), the first installation groove (23) and the second installation groove (24) communicate with the magnetic conduction groove (22); The first installation groove (23) and the second installation groove (24) are arranged symmetrically with respect to the magnetic conduction groove (22); The positioning slot (21) is arranged farther from the center of the rotor core (1) than the magnetic guiding slot (22). 8. The rotor according to claim 7, characterized in that, the magnetic pole slot (2) is V-shaped, and the opening of the magnetic pole slot (2) faces the outer peripheral direction of the rotor core (1); wherein , the magnetic conducting part (3) and the elastic part (4) are arranged at the turning point of the magnetic pole groove (2). 9. The rotor according to claim 7, characterized in that, the magnetic pole slots (2) are linear. 10. A permanent magnet motor, comprising a stator and a stator winding arranged in the stator for generating an alternating magnetic field, characterized in that, it also includes a stator winding arranged in the stator as claimed in any one of claims 1 to 9. the rotor described above.