CN112994290B - Rotor structure and permanent magnet synchronous motor - Google Patents
Rotor structure and permanent magnet synchronous motor Download PDFInfo
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- CN112994290B CN112994290B CN202110168753.3A CN202110168753A CN112994290B CN 112994290 B CN112994290 B CN 112994290B CN 202110168753 A CN202110168753 A CN 202110168753A CN 112994290 B CN112994290 B CN 112994290B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The invention discloses a rotor structure and a permanent magnet synchronous motor, relates to the technical field of motors, and solves the technical problem that a permanent magnet is easy to generate a demagnetization phenomenon in the prior art. The rotor structure comprises a rotor body, wherein the rotor body is provided with a plurality of permanent magnet grooves in the circumferential direction, the permanent magnet grooves are used for placing permanent magnets, two ends of each permanent magnet groove are respectively provided with a first magnetism isolating hole and a second magnetism isolating hole, the first magnetism isolating hole and the second magnetism isolating hole are respectively connected with two ends of each permanent magnet groove, and the first magnetism isolating hole and the second magnetism isolating hole are symmetrically distributed around the straight axis of the rotor body. The rotor structure of the invention can reduce the torque pulsation of the motor operation and reduce the vibration and noise of the motor through the arrangement of the first magnetism isolating hole and the second magnetism isolating hole, and can also reduce the density degree of magnetic lines of force at two ends of the permanent magnet and improve the demagnetization resistance of the permanent magnet, thereby improving the safety, efficiency and stability of the motor operation and ensuring the service life of the motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor structure and a permanent magnet synchronous motor comprising the same.
Background
The permanent magnet synchronous motor has the characteristics of high torque density, low manufacturing cost, wide high-efficiency area and the like, and is widely applied in the field of household appliances. However, in the permanent magnet synchronous motor, the most critical permanent magnet inside the rotor is easy to generate demagnetization under severe working conditions such as large current or large load, and especially, the demagnetization of the two ends of the permanent magnet is more serious, which has great influence on the operation efficiency and stability of the motor and the service life of the motor. In order to improve the demagnetization resistance of the permanent magnet of the motor, various rotor structures and permanent magnet motors are designed in the prior art, and specific examples are described as follows.
Chinese patent (CN110994836A) discloses a motor rotor and a permanent magnet motor. This electric motor rotor includes rotor core and the magnetism steel slot of setting on rotor core, and the circumference extension of rotor core is followed in the magnet steel slot, is provided with the permanent magnet in the magnet steel slot, still is provided with on the rotor core and separates the magnetism hole, separates the outside edge of magnetism steel slot that the magnetism hole setting is located rotor core's radial outside to with the magnet steel slot intercommunication, separate the D axial symmetry of magnetism hole about this separate the magnetism hole place utmost point. The motor rotor and the permanent magnet motor disclosed in the patent can enhance the demagnetization resistance of the permanent magnet through the arrangement of the magnetism isolating holes, but the performance of the motor is also reduced.
Chinese patent (CN110401278A) discloses a brushless motor rotor punching structure for a braking system. This brushless motor rotor punching structure includes the rotor punching, and the centre of a circle department of rotor punching has the pivot groove, and the periphery that the rotor punching is located the pivot groove evenly is equipped with a plurality of magnet steel groove along the circumferencial direction, and the outer edge that the rotor punching is located every magnet steel groove department has magnetism-isolating groove, and the central line in magnetism-isolating groove and the contained angle between the magnetic line of force of rotor punching are 0, have magnetism-isolating filling block in the magnetism-isolating groove. The rotor punching structure of the brushless motor disclosed by the patent can increase the quadrature axis equivalent reluctance of the motor and reduce the nonlinear influence of parameters of the permanent magnet brushless motor for a braking system caused by the cross coupling of the direct and quadrature axis magnetic circuits. The brushless motor rotor punching structure disclosed by the patent can weaken the magnetic saturation phenomenon generated in the magnetizing process and improve the anti-demagnetization capability of the permanent magnet, but the structure is simple and the improvement of the anti-demagnetization capability of the motor permanent magnet is not obvious.
Chinese patent (CN103872819A) discloses a rotor assembly and a permanent magnet motor including the same. The rotor assembly includes a rotor core and a plurality of permanent magnet groups uniformly arranged in a circumferential direction of the rotor core. Each of the permanent magnet groups includes a first permanent magnet located at a middle portion of the permanent magnet group and a second permanent magnet located at an end portion of the permanent magnet group. And a first magnetism isolating groove is arranged between the edge of the end part of the second permanent magnet, which is far away from the first permanent magnet, and the outer periphery of the rotor core, and the first magnetism isolating groove extends along the outer periphery of the rotor core in the extending direction of the permanent magnets. The rotor assembly disclosed in the patent can improve the demagnetization resistance of the permanent magnets in the rotor assembly by optimizing the magnetic field distribution among the permanent magnets and reducing the density of magnetic lines of force, however, the rotor assembly has a complex structure and high requirements on the manufacturing process.
Therefore, in order to improve the demagnetization resistance of the permanent magnet, improve the operation efficiency and operation stability of the motor, and prolong the service life of the motor, the rotor structure in the prior art needs to be improved urgently.
Disclosure of Invention
One of the purposes of the invention is to provide a rotor structure and a permanent magnet synchronous motor, which solve the technical problem that the permanent magnet is easy to generate demagnetization in the prior art. The various technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the rotor structure comprises a rotor body, wherein the rotor body is provided with a plurality of permanent magnet grooves in the circumferential direction, the permanent magnet grooves are used for placing permanent magnets, two ends of each permanent magnet groove are respectively provided with a first magnetism isolating hole and a second magnetism isolating hole, the first magnetism isolating holes and the second magnetism isolating holes are respectively connected with two ends of each permanent magnet groove, and the first magnetism isolating holes and the second magnetism isolating holes are symmetrically distributed around the straight axis of the rotor body.
According to a preferred embodiment, the first and second magnetism isolating holes are provided with a first magnetism isolating groove near the outer edge side of the rotor body and along the circumferential direction of the rotor body, and the first and second magnetism isolating holes are provided with a second magnetism isolating groove along the radial direction of the rotor body and away from the permanent magnet side.
According to a preferred embodiment, the first magnetism isolating groove and the second magnetism isolating groove are strip-shaped magnetism isolating grooves, and the first magnetism isolating groove and the second magnetism isolating groove satisfy the following conditions: k1 ═ k2, w2 ≤ 0.75 ═ w1, where k1 is the width of the first flux barrier groove in the circumferential direction of the rotor body, w1 is the width of the first flux barrier groove in the radial direction of the rotor body, k2 is the width of the second flux barrier groove in the radial direction of the rotor body, and w2 is the width of the second flux barrier groove in the circumferential direction of the rotor body.
According to a preferred embodiment, the permanent magnet slot and the first magnetism isolating slot satisfy: 0.5 × c ≤ w1 ≤ 0.2 × k1, where c is a width of the permanent magnet slots in the radial direction of the rotor body, k1 is a width of the first magnetism isolating slots in the circumferential direction of the rotor body, and w1 is a width of the first magnetism isolating slots in the radial direction of the rotor body.
According to a preferred embodiment, the permanent magnet slot and the second magnetism isolating slot satisfy: 0.25 × c is not less than w2 is not less than 0.2 × k2, a is not less than 0.5 × k2, wherein a is the length of the slot edge of the second magnetism isolating slot along the radial direction of the rotor body and close to the side of the permanent magnet slot under the same pole, c is the width of the permanent magnet slot along the radial direction of the rotor body, k2 is the width of the second magnetism isolating slot along the radial direction of the rotor body, and w2 is the width of the second magnetism isolating slot along the circumferential direction of the rotor body.
According to a preferred embodiment, the permanent magnet slot is provided with at least a third magnetism isolating hole and a fourth magnetism isolating hole near the outer edge side of the rotor body, and the third magnetism isolating hole and the fourth magnetism isolating hole are in long strips.
According to a preferred embodiment, the third magnetism isolating hole and the fourth magnetism isolating hole satisfy the following conditions with the first magnetism isolating groove: h is 0.5 d is 0.5 w1, wherein h is the distance from the permanent magnet slot to the third and fourth magnetism isolating holes, d is the width of the third and fourth magnetism isolating holes, and w1 is the width of the first magnetism isolating slot in the radial direction of the rotor body.
According to a preferred embodiment, a first magnetism isolating bridge is formed between the first magnetism isolating groove and the outer edge of the rotor body, and a second magnetism isolating bridge is formed between two adjacent second magnetism isolating grooves.
According to a preferred embodiment, the first and second magnetic isolation bridges and the first and second magnetic isolation grooves satisfy: 0.6 × w2 ≤ m1 ≤ 0.5 × m2 ≤ w1, wherein m1 is a width of the first magnetism isolating bridge in the radial direction of the rotor body, m2 is a width of the second magnetism isolating bridge in the circumferential direction of the rotor body, w1 is a width of the first magnetism isolating groove in the radial direction of the rotor body, and w2 is a width of the second magnetism isolating groove in the circumferential direction of the rotor body.
The permanent magnet synchronous motor comprises the rotor structure according to any technical scheme of the invention.
The rotor structure and the permanent magnet synchronous motor provided by the invention at least have the following beneficial technical effects:
according to the rotor structure, the first magnetism isolating hole and the second magnetism isolating hole are respectively arranged at two ends of each permanent magnet groove and are respectively connected with the two ends of each permanent magnet groove, the first magnetism isolating hole and the second magnetism isolating hole are symmetrically distributed about a straight shaft of the rotor body, and through the arrangement of the first magnetism isolating hole and the second magnetism isolating hole, a magnetic circuit in the rotor can be influenced and distributed according to a certain rule, the magnetic circuit is optimized, on one hand, torque pulsation of motor operation can be reduced, vibration and noise of the motor can be reduced, on the other hand, the concentration degree of magnetic lines of force at two ends of the permanent magnet can be reduced, and demagnetization resistance of the permanent magnet can be improved, so that the safety, efficiency and stability of the motor operation can be improved, and the service life of the motor can be guaranteed. The rotor structure and the permanent magnet synchronous motor solve the technical problem that the permanent magnet is easy to demagnetize in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of a preferred embodiment of a rotor structure of the present invention;
FIG. 2 is a schematic drawing showing the dimensions of the various components of the rotor structure of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a graph comparing the torque ripple factor of the motor of the present invention with that of a prior art motor;
FIG. 5 is a graph comparing the demagnetization rates at various currents for the motor of the present invention and the prior art motor;
FIG. 6 is a top view of another preferred embodiment of a rotor structure of the present invention;
figure 7 is a top view of yet another preferred embodiment of a rotor structure of the present invention.
In the figure: 10. a rotor body; 101. a permanent magnet slot; 102. a permanent magnet; 103. a first magnetism isolating hole; 103a, a first magnetism isolating groove; 103b, a second magnetism isolating groove; 104. a second magnetism isolating hole; 105. a third magnetism isolating hole; 106. a fourth magnetism isolating hole; 107. a first magnetic isolation bridge; 108. and a second magnetic isolation bridge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The rotor structure and the permanent magnet synchronous motor of the present invention will be described in detail with reference to the accompanying drawings 1 to 7 and embodiments 1 and 2 of the specification.
Example 1
The present embodiment describes the rotor structure of the present invention in detail.
The rotor structure of the present embodiment includes a rotor body 10, as shown in fig. 1 to 3, 6 and 7. Preferably, the rotor body 10 is provided with a plurality of permanent magnet slots 101 in the circumferential direction, the permanent magnet slots 101 are used for placing permanent magnets 102, two ends of each permanent magnet slot 101 are respectively provided with a first magnetism isolating hole 103 and a second magnetism isolating hole 104, and the first magnetism isolating hole 103 and the second magnetism isolating hole 104 are respectively connected with two ends of the permanent magnet slot 101, and the first magnetism isolating hole 103 and the second magnetism isolating hole 104 are symmetrically distributed about the straight axis of the rotor body 10, as shown in fig. 1 and 2, and fig. 6 and 7. The circumferential direction of the rotor body 10 in the present embodiment may be the end surface direction of the rotor body 10. The straight shaft in this embodiment is a shaft on which the diameter of the end face of the rotor body 10 is located. More preferably, permanent magnet slot 101 may have a straight-line structure or a V-line structure, as shown in fig. 1 or fig. 6. Without being limited thereto, the permanent magnet slot 101 may also have the remaining structure. As shown in fig. 1 and 2, fig. 6 and 7, the rotor body 10 is provided with six permanent magnet grooves 101 in the circumferential direction. More preferably, the permanent magnet 102 is a rare earth permanent magnet.
Fig. 4 is a graph showing a comparison of torque ripple coefficients of the motor of the present invention and the conventional motor, and fig. 5 is a graph showing a comparison of demagnetization rates of the motor of the present invention and the conventional motor at various currents, as shown in fig. 4, the torque ripple system of the motor of the present invention is significantly reduced compared to the conventional motor; as shown in fig. 5, the demagnetization rate of the motor of the present invention at each current is reduced compared to the conventional motor, that is, the demagnetization resistance of the motor of the present invention is improved. Therefore, the rotor structure of the embodiment can influence the magnetic circuit inside the rotor and enable the magnetic circuit to be distributed according to a certain rule through the arrangement of the first magnetism isolating holes 103 and the second magnetism isolating holes 104, the magnetic circuit is optimized, on one hand, the torque pulsation of the motor operation can be reduced, the vibration and the noise of the motor are reduced, on the other hand, the density of magnetic lines of force at two ends of the permanent magnet 102 can be reduced, the demagnetization resistance of the permanent magnet 102 is improved, the safety, the efficiency and the stability of the motor operation can be improved, and the service life of the motor is guaranteed. The rotor structure of this embodiment solves the technical problem that the permanent magnet is easy to demagnetize in the prior art, and particularly solves the technical problem that the rare earth permanent magnet is easy to demagnetize in the prior art.
According to a preferred embodiment, the first and second magnetism isolating holes 103 and 104 are provided with a first magnetism isolating groove 103a near the outer edge side of the rotor body 10 and in the circumferential direction of the rotor body 10, and the first and second magnetism isolating holes 103 and 104 are provided with a second magnetism isolating groove 103b in the radial direction of the rotor body 10 and in the side away from the permanent magnet 102, as shown in fig. 1 or 6. Preferably, the first magnetism isolating hole 103 and the second magnetism isolating hole 104 are of an L-shaped or L-shaped similar structure. The L-shaped structure refers to, for example, a structure in which the first and second magnetism isolating grooves 103a and 103b are perpendicular to each other, as shown in fig. 1. The structure similar to the L-shape refers to, for example, a structure in which the second magnetism isolating groove 103b is bent toward the permanent magnet 102 side, as shown in fig. 7. In the preferred technical scheme of this embodiment, the first magnetism isolating hole 103 and the second magnetism isolating hole 104 are provided with a first magnetism isolating groove 103a near the outer edge side of the rotor body 10 and along the circumferential direction of the rotor body 10, and the first magnetism isolating hole 103 and the second magnetism isolating hole 104 are provided with a second magnetism isolating groove 103b along the radial direction of the rotor body 10 and away from the permanent magnet 102, so that the structure can increase the branch of the cross-axis magnetic circuit, guide the magnetic flux to be shunted, optimize the magnetic circuit passing through the permanent magnet 102, prevent the magnetic density values at the two sides of the permanent magnet 102 from being too high, and improve the demagnetization resistance of the permanent magnet 102.
According to a preferred embodiment, the first magnetism isolating groove 103a and the second magnetism isolating groove 103b are strip-shaped magnetism isolating grooves, and the first magnetism isolating groove 103a and the second magnetism isolating groove 103b satisfy: k1 is k2, w2 is less than or equal to 0.75 is w 1. Where k1 is the width of the first magnetism isolating groove 103a in the circumferential direction of the rotor body 10, w1 is the width of the first magnetism isolating groove 103a in the radial direction of the rotor body 10, k2 is the width of the second magnetism isolating groove 103b in the radial direction of the rotor body 10, and w2 is the width of the second magnetism isolating groove 103b in the circumferential direction of the rotor body 10, as shown in fig. 2 or 3. In the preferred technical solution of this embodiment, the first magnetism isolating groove 103a and the second magnetism isolating groove 103b are strip-shaped magnetism isolating grooves, and the space between the first magnetism isolating groove 103a and the second magnetism isolating groove 103b satisfies: k1 is k2, w2 is not more than 0.75 is w1, and the demagnetization resistance of the permanent magnet 102 can be further improved.
According to a preferred embodiment, the permanent magnet slot 101 and the first magnetism isolating slot 103a satisfy: 0.5 × c is not less than w1 is not less than 0.2 × k 1. Where c is the width of the permanent magnet groove 101 in the radial direction of the rotor body 10, k1 is the width of the first magnetism isolating groove 103a in the circumferential direction of the rotor body 10, and w1 is the width of the first magnetism isolating groove 103a in the radial direction of the rotor body 10, as shown in fig. 2 or 3. In the preferred technical scheme of the embodiment, the space between the permanent magnet slot 101 and the first magnetism isolating slot 103a satisfies the following conditions: w1 is not less than 0.5 and not more than 0.2 and not more than k1, so that the magnetic resistance of the two ends of the permanent magnet 102 close to the edge of the rotor body 10 can be increased, magnetic lines of force are not easy to pass through, the distribution of a magnetic circuit is improved, the routing of the magnetic lines of force in the rotor is changed, and the waveform of air gap flux density is improved, so that the counter potential harmonic ratio is reduced, the torque ripple coefficient of the motor is reduced, the amplitude of electromagnetic force is reduced, and the electromagnetic vibration noise of the motor is reduced.
According to a preferred embodiment, the permanent magnet slot 101 and the second magnetism isolating slot 103b satisfy: w2 is not less than 0.25 × c and not more than 0.2 × k2, and a is not less than 0.5 × k 2. Where a is a slot edge length of the second magnetism isolating slot 103b along the radial direction of the rotor body 10 and near the permanent magnet slot 101 side under the same pole, c is a width of the permanent magnet slot 101 along the radial direction of the rotor body 10, k2 is a width of the second magnetism isolating slot 103b along the radial direction of the rotor body 10, and w2 is a width of the second magnetism isolating slot 103b along the circumferential direction of the rotor body 10, as shown in fig. 2 or 3. In the preferred technical scheme of the embodiment, the space between the permanent magnet slot 101 and the second magnetism isolating slot 103b satisfies the following conditions: w2 is not less than 0.25 × c and not more than 0.2 × k2, a is not less than 0.5 × k2, so that the magnetic resistance of the two ends of the permanent magnet 102 close to the inner side of the rotor body 10 can be increased, magnetic lines of force in the rotor are not easy to pass through the two ends of the permanent magnet 102, magnetic flux is guided to be shunted, a magnetic circuit passing through the permanent magnet 102 is optimized, and the demagnetization resistance of the permanent magnet 102 is improved.
According to a preferred embodiment, the permanent magnet slot 101 is provided with at least a third magnetism isolating hole 105 and a fourth magnetism isolating hole 106 near the outer edge side of the rotor body 10, and the third magnetism isolating hole 105 and the fourth magnetism isolating hole 106 are in a long strip shape, as shown in fig. 1 to 3, fig. 6 and fig. 7. Preferably, the third magnetism isolating hole 105 and the fourth magnetism isolating hole 106 satisfy the following conditions with the first magnetism isolating groove 103 a: h 0.5 d 0.5 w 1. Where h is the distance of the third and fourth magnetism isolating holes 105 and 106 from the permanent magnet slot 101, d is the width of the third and fourth magnetism isolating holes 105 and 106, and w1 is the width of the first magnetism isolating slot 103a in the radial direction of the rotor body 10, as shown in fig. 2 or 3. In the preferred technical solution of this embodiment, the third magnetism isolating hole 105 and the fourth magnetism isolating hole 106 and the first magnetism isolating groove 103a satisfy: h is 0.5 d is 0.5 w1, which can make the magnetic conductance of the rotor structure more uniform when the motor runs, improve the air gap flux density waveform, further reduce the torque ripple coefficient of the motor, reduce the counter electromotive force harmonic ratio of the motor, and reduce the electromagnetic force density peak value and the electromagnetic vibration noise of the motor.
According to a preferred embodiment, a first magnetism isolating bridge 107 is formed between the first magnetism isolating groove 103a and the outer edge of the rotor body 10, and a second magnetism isolating bridge 108 is formed between two adjacent second magnetism isolating grooves 103b, as shown in fig. 1-3, 6 and 7. Preferably, the first magnetism isolating bridge 107 and the second magnetism isolating bridge 108 and the first magnetism isolating groove 103a and the second magnetism isolating groove 103b satisfy: 0.6 w2 ≤ m1 ≤ 0.5 m2 ≤ w 1. Where m1 is the width of the first magnetism isolating bridge 107 in the radial direction of the rotor body 10, m2 is the width of the second magnetism isolating bridge 108 in the circumferential direction of the rotor body 10, w1 is the width of the first magnetism isolating groove 103a in the radial direction of the rotor body 10, and w2 is the width of the second magnetism isolating groove 103b in the circumferential direction of the rotor body 10, as shown in fig. 2 or 3. In the preferred technical solution of this embodiment, the first magnetism isolating bridge 107 and the second magnetism isolating bridge 108, and the first magnetism isolating groove 103a and the second magnetism isolating groove 103b satisfy: 0.6 w2 is not less than m1 is not less than 0.5 m2 is not less than w1, so that the structure of the rotor punching sheet is more stable, the magnetic resistance distribution around the permanent magnet 102 can be improved, the magnetic path passing through the permanent magnet 102 is further optimized, the demagnetization resistance of the permanent magnet 102 is improved, the magnetic field distribution at an air gap can be improved, the harmonic wave and the harmonic wave loss are reduced, the working efficiency of the motor is improved, and the electromagnetic vibration noise can be reduced.
Example 2
This embodiment describes the permanent magnet synchronous motor of the present invention in detail.
The permanent magnet synchronous motor of the present embodiment includes the rotor structure according to any one of the technical solutions of embodiment 1. Preferably, the permanent magnet synchronous motor is a rare earth permanent magnet synchronous motor. The permanent magnet synchronous motor of the embodiment has the rotor structure of any technical scheme in the embodiment 1, so that on one hand, the torque pulsation of the motor in operation can be reduced, the vibration and the noise of the motor are reduced, on the other hand, the density of magnetic lines of force at two ends of the permanent magnet 102 can also be reduced, and the demagnetization resistance of the permanent magnet 102 is improved, so that the safety, the efficiency and the stability of the motor in operation can be improved, and the service life of the motor is guaranteed. The permanent magnet synchronous motor of the embodiment solves the technical problem that demagnetization easily occurs to a permanent magnet in the prior art.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A rotor structure is characterized by comprising a rotor body (10), wherein the rotor body (10) is provided with a plurality of permanent magnet grooves (101) in the circumferential direction, the permanent magnet grooves (101) are used for placing permanent magnets (102), two ends of each permanent magnet groove (101) are respectively provided with a first magnetism isolating hole (103) and a second magnetism isolating hole (104), the first magnetism isolating holes (103) and the second magnetism isolating holes (104) are respectively connected with two ends of each permanent magnet groove (101), and the first magnetism isolating holes (103) and the second magnetism isolating holes (104) are symmetrically distributed about the straight axis of the rotor body (10);
the first magnetism isolating hole (103) and the second magnetism isolating hole (104) are provided with a first magnetism isolating groove (103a) close to the outer edge side of the rotor body (10) and along the circumferential direction of the rotor body (10), the first magnetism isolating hole (103) and the second magnetism isolating hole (104) are provided with a second magnetism isolating groove (103b) along the radial direction of the rotor body (10), and the second magnetism isolating groove (103b) deviates from the permanent magnet (102) and extends towards the radial inner side of the permanent magnet (102);
the first magnetism isolating groove (103a) and the second magnetism isolating groove (103b) are strip-shaped magnetism isolating grooves, and the first magnetism isolating groove (103a) and the second magnetism isolating groove (103b) meet the following conditions: k1 ═ k2, w2 ≤ 0.75 ═ w1, where k1 is the width of the first magnetism isolating groove (103a) in the circumferential direction of the rotor body (10), w1 is the width of the first magnetism isolating groove (103a) in the radial direction of the rotor body (10), k2 is the width of the second magnetism isolating groove (103b) in the radial direction of the rotor body (10), and w2 is the width of the second magnetism isolating groove (103b) in the circumferential direction of the rotor body (10).
2. A rotor structure according to claim 1, characterized in that between the permanent magnet slot (101) and the first flux barrier slot (103a) there is satisfied: 0.5 × c ≦ w1 ≦ 0.2 × k1, wherein,
c is a width of the permanent magnet groove (101) in a radial direction of the rotor body (10), k1 is a width of the first magnetism isolating groove (103a) in a circumferential direction of the rotor body (10), and w1 is a width of the first magnetism isolating groove (103a) in the radial direction of the rotor body (10).
3. A rotor structure according to claim 1, characterized in that between the permanent magnet slot (101) and the second flux barrier slot (103b) there is satisfied: 0.25 × c is not less than w2 is not less than 0.2 × k2, a is not less than 0.5 × k2, wherein,
a is the length of the second magnetism isolating groove (103b) along the radial direction of the rotor body (10) and close to the side of the permanent magnet groove (101) under the same pole, c is the width of the permanent magnet groove (101) along the radial direction of the rotor body (10), k2 is the width of the second magnetism isolating groove (103b) along the radial direction of the rotor body (10), and w2 is the width of the second magnetism isolating groove (103b) along the circumferential direction of the rotor body (10).
4. The rotor structure according to claim 1, characterized in that the permanent magnet slot (101) is provided with at least a third magnetism isolating hole (105) and a fourth magnetism isolating hole (106) near the outer edge side of the rotor body (10), and the third magnetism isolating hole (105) and the fourth magnetism isolating hole (106) are elongated.
5. The rotor structure according to claim 4, characterized in that the third and fourth flux-isolating holes (105, 106) and the first flux-isolating slot (103a) satisfy: h 0.5 d 0.5 w1, wherein,
h is a distance from the third magnetism isolating hole (105) and the fourth magnetism isolating hole (106) to the permanent magnet groove (101), d is a width of the third magnetism isolating hole (105) and the fourth magnetism isolating hole (106), and w1 is a width of the first magnetism isolating groove (103a) in a radial direction of the rotor body (10).
6. The rotor structure according to claim 1, characterized in that a first magnetic isolation bridge (107) is formed between the first magnetic isolation groove (103a) and the outer edge of the rotor body (10), and a second magnetic isolation bridge (108) is formed between two adjacent second magnetic isolation grooves (103 b).
7. The rotor structure according to claim 6, characterized in that between the first and second magnetic isolating bridges (107, 108) and the first and second magnetic isolating slots (103a, 103b) are satisfied: 0.6 w2 ≤ m1 ≤ 0.5 m2 ≤ w1, wherein,
m1 is a width of the first magnetism isolating bridge (107) in a radial direction of the rotor body (10), m2 is a width of the second magnetism isolating bridge (108) in a circumferential direction of the rotor body (10), w1 is a width of the first magnetism isolating groove (103a) in the radial direction of the rotor body (10), and w2 is a width of the second magnetism isolating groove (103b) in the circumferential direction of the rotor body (10).
8. A permanent magnet synchronous machine, characterized in that it comprises a rotor structure according to one of claims 1 to 7.
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