A rotor core and a motor

Abstract

The present invention discloses a rotor core and a motor, belonging to the technical field of motors, wherein the motor comprises a rotor core, the rotor core comprises a plurality of rotor teeth, the plurality of rotor teeth are centrally symmetrically distributed with the central axis of the rotor core as the symmetry center, and the plurality of rotor teeth adopt a helical tooth structure. The rotor core and the motor comprising the rotor core of the present invention have high heat dissipation performance, and the structure of the rotor continuous oblique pole can improve the fluid field, improve the air cooling performance of the rotor, and thus improve the heat dissipation capacity of the motor when it is working.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor core and a motor. Background Art

[0002] With the rapid development of high-tech industries such as new energy vehicles and electric aircraft, high power density has become an important design indicator for motors. While promoting the development of high power density of motors, it also brings about problems such as a sharp increase in internal heat generation and a serious lack of effective heat dissipation space. When the temperature rise inside the motor is too high to exceed the temperature resistance limit of the insulation material, it will not only damage the insulation inside the motor, but also cause irreversible demagnetization of the permanent magnet, thereby reducing the working efficiency of the motor and seriously affecting the life of the motor and the safety of the motor operation. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a rotor core and a motor with high heat dissipation performance. By adopting a rotor continuous oblique pole structure, the rotor teeth of the rotor core are inclined at a certain angle clockwise or counterclockwise, so that the rotor teeth appear as oblique teeth in space, thereby increasing the contact area between the rotor and the air, and promoting air flow while the rotor moves, thereby achieving the effect of improving the heat dissipation performance.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A rotor core comprises a plurality of rotor teeth, wherein the plurality of rotor teeth are centrally symmetrically distributed with the central axis of the rotor core as the symmetry center, the plurality of rotor teeth adopt a helical tooth structure, and the inner arc center angle θ1, the outer arc center angle θ2 and the helical tooth inclination angle θ3 of a single rotor tooth satisfy the following mathematical model:

[0006]

[0007] X=[x1,x2,x3]=[θ1,θ2,θ3],

[0008]

[0009] Among them, x i represents the design parameters, i = 1, 2, 3, T avg_0 and T rip_0 represents the initial average torque and initial torque ripple, T avg (x i ) and T rip_0 (x i ) represents the optimized average torque and torque ripple, and st represents the constraint condition.

[0010] In a specific embodiment, the response surface algorithm is used to solve the above mathematical model. The range of the inner arc center angle θ1 is 16 to 24 degrees. The range of the outer arc center angle θ2 is 8 to 12 degrees. The range of the helical gear inclination angle θ3 is 5 to 10 degrees.

[0011] The cross section of the above helical tooth is composed of arcs and polylines.

[0012] The present invention also provides a motor, comprising the above-mentioned rotor core and stator.

[0013] In a specific embodiment, the stator windings are placed in a concentrated short distance, the stator core is set to 12 slots, and the rotor core is set to 10 poles.

[0014] In a specific embodiment, the motor is a flux switching motor.

[0015] Beneficial effect: the rotor core and the motor including the rotor core of the present invention have high heat dissipation performance, and the use of a rotor continuous oblique pole structure can improve the fluid field and improve the air cooling performance of the rotor, thereby improving the heat dissipation capacity of the motor when it is working.

[0016] In order to make the above features and advantages of the invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the rotor core of the present invention.

[0018] Figure 2 It is a right side view of the rotor core of the present invention.

[0019] Figure 3 It is an axonometric view of the rotor core of the present invention.

[0020] Figure 4 It is an axonometric view of the motor of the present invention.

[0021] Figure 5 The torque waveforms of the rotor core of the present invention and the rotor core of a normal structure at a rotation speed of 1500 rpm. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Figure 1FIG. 1 is a front view of a rotor core of the present invention, as shown in FIG. Figure 1 As shown, each rotor tooth of the rotor core 1 is tilted clockwise at a certain angle in space, and each rotor tooth is centrally symmetrically distributed with the central axis O of the rotor core 1 as the symmetry center. Figure 1 In the figure, taking the helical tooth 11 as an example, AB represents the outer arc of the helical tooth 11, and CD represents the inner arc of the helical tooth 11. More specifically, the cross section of the helical tooth is composed of an outwardly convex circular arc and a multi-segment line. Figure 1 As shown, the cross section of the helical tooth 11 is composed of a polyline AC, a polyline BD and an arc AB.

[0024] While using the helical gear structure to improve the heat dissipation performance, it should not have a significant impact on the torque performance of the motor. On this basis, a mathematical model with the inner arc center angle θ1, the outer arc center angle θ2 and the helical gear inclination angle θ3 as independent variables and torque and torque pulsation as targets is established to study the influence of the inner arc center angle θ1, the outer arc center angle θ2 and the helical gear inclination angle θ3 on the motor torque performance. The expression of the above mathematical model is as follows:

[0025]

[0026] X=[x1,x2,x3]=[θ1,θ2,θ3],

[0027]

[0028] In the formula, x i represents the design parameters, i = 1, 2, 3, T avg_0 and T rip_0 represents the initial average torque and initial torque ripple, T avg (x i ) and T rip_0 (x i ) represents the optimized average torque and torque ripple, and st represents the constraint condition.

[0029] The response surface algorithm is used to solve the above mathematical model to determine the optimal ranges of the inner arc center angle θ1, the outer arc center angle θ2 and the helical gear inclination angle θ3. In this specific embodiment, the inner arc center angle θ1 of a single helical gear is in the range of 16 to 24 degrees, the outer arc center angle θ2 is in the range of 8 to 12 degrees, and the helical gear inclination angle θ3 is in the range of 5 to 10 degrees.

[0030] Figure 2 It is the right view of the rotor core 1. Figure 3 is an axonometric view of the rotor core 1, combined with Figure 2 and Figure 3 , the structure of the rotor core 1 can be observed more clearly.

[0031] The present invention also provides a motor, Figure 4It is an axonometric diagram of the motor of the present invention, wherein the motor comprises a rotor core 1 and a stator 2, wherein the stator winding is placed in a concentrated short distance, the stator core is provided with 12 slots, and the rotor core 1 is provided with 10 poles.

[0032] In a specific embodiment, the motor is a flux switching motor.

[0033] In a specific embodiment, the motor is a switched reluctance motor.

[0034] Figure 5 The torque waveforms of the rotor core of the present invention and the rotor core of normal structure at a rotation speed of 1500rpm. The normal structure means that the rotor core has no continuous skewed poles. From the comparison of the torque waveforms of the two, it can be seen that the helical tooth structure has little effect on the torque and has a suppressive effect on the torque pulsation.

[0035] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A rotor core, characterized in that: The invention comprises a plurality of rotor teeth, wherein the plurality of rotor teeth are centrally symmetrically distributed with the central axis of the rotor core as the symmetry center, the plurality of rotor teeth adopt a helical tooth structure, and the inner arc center angle θ1, the outer arc center angle θ2 and the helical tooth inclination angle θ3 of a single rotor tooth satisfy the following mathematical model: X=[x1,x2,x3]=[θ1,θ2,θ3], Among them, x i represents the design parameters, i = 1, 2, 3, T avg_0 and T rip_0 represents the initial average torque and initial torque ripple, T avg (x i ) and T rip_0 (x i ) represents the optimized average torque and torque ripple, and st represents the constraint condition.

2. A rotor core as claimed in claim 1, characterized in that: The mathematical model is solved using response surface methodology.

3. A rotor core as claimed in claim 2, characterized in that: The range of the inner arc center angle θ1 is 16 to 24 degrees.

4. A rotor core as claimed in claim 3, characterized in that: The central angle θ2 of the outer arc is in the range of 8 to 12 degrees.

5. A rotor core as claimed in claim 4, characterized in that: The inclination angle θ3 of the helical teeth is in the range of 5 to 10 degrees.

6. A rotor core as claimed in claim 1, characterized in that: The cross section of the helical tooth is composed of circular arcs and polylines.

7. A motor, characterized in that: It comprises a rotor core and a stator as described in any one of claims 1 to 6.

8. A motor as claimed in claim 7, characterized in that: The stator winding is placed in a concentrated short distance, and the stator core is set to 12 slots.

9. A motor as claimed in claim 8, characterized in that: The rotor core is configured with 10 poles.

10. A motor as claimed in claim 7, characterized in that: The motor is a flux switching motor.

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