Rotor component and motor

Abstract

The invention discloses a rotor component, and belongs to the technical field of motor equipment. The rotor component can comprise a rotor core and a plurality of groups of magnetic steels. The thickness h of the magnetic steel in each magnetic steel group in the rotor component is reasonably set by adopting the corresponding relational expression, so that the PWM harmonic noise of the motor can be effectively improved under the condition of ensuring that the cost of the motor integrated with the rotor component is relatively low.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment, and in particular to a rotor component and a motor. Background Art

[0002] Motors, such as permanent magnet synchronous motors, are widely used in various industries due to their high power density and high efficiency. In particular, concentrated winding permanent magnet motors, which have the characteristics of low winding ends and simple processing technology, are becoming more and more popular. However, due to the interaction between the stator harmonic magnetic field excited by the non-sinusoidal current and the rotor magnetic field generated by the permanent magnet during the rotation of the motor, part of the electromagnetic force is used to drive the motor to rotate, and the other part acts on the stator teeth to generate electromagnetic noise. Electromagnetic noise has a high frequency and strong penetration, which often causes auditory discomfort to people. In particular, the electromagnetic noise generated by the inverter PWM harmonics on the permanent magnet synchronous motor is particularly serious. Summary of the invention

[0003] The embodiment of the present application provides a rotor component and a motor. It can solve the problem in the prior art that the electromagnetic noise generated by the PWM harmonics of the inverter on the permanent magnet synchronous motor is particularly serious. The technical solution is as follows:

[0004] In one aspect, a rotor component is provided, wherein the rotor component is installed in a motor, and the rotor component comprises:

[0005] A rotor core, wherein the rotor core has a plurality of groups of magnetic steel slots distributed along the circumference of the rotor core, and each group of the magnetic steel slots includes two magnetic steel slots arranged in a V-shape;

[0006] A plurality of magnetic steel groups, each of which corresponds to the plurality of magnetic steel slots, each of which comprises two magnetic steels, and the two magnetic steels in each of which are embedded in two corresponding magnetic steel slots;

[0007] Wherein, the thickness of the magnetic steel in each magnetic steel group is Among them, μ r is the relative magnetic permeability of the magnetic steel; B r is the remanence of the magnetic steel; τ is the pole pitch; B g is the magnetic induction intensity in the air gap; δ is the leakage flux coefficient; the value range of k is: 1.1 to 1.3.

[0008] Optionally, the angle α between the two magnetic steels in each magnetic steel group is 2π / GCD(Z, 2P)±1°, Z is the number of stator core slots in the motor, and P is the number of pole pairs of the motor;

[0009] And / or, the pole arc angle β between the two magnetic steels in each magnetic steel group is β=2π / 3P±1°.

[0010] Optionally, for a 12-slot 8-pole motor integrated with the rotor component, the thickness of the magnetic steel in each magnetic steel group is 3 mm or 4 mm.

[0011] Optionally, for a 12-slot 8-pole motor integrated with the rotor component, the angle α between the two magnetic steels in each magnetic steel group is 90 degrees;

[0012] And / or, a pole arc angle β between two magnetic steels in each magnetic steel group is 30 degrees.

[0013] Optionally, for a 9-slot 6-pole motor integrated with the rotor component, the thickness of the magnetic steel in each magnetic steel group is 3 mm or 4 mm.

[0014] Optionally, for a 9-slot 6-pole motor integrated with the rotor component, the angle α between the two magnetic steels in each magnetic steel group is 120 degrees;

[0015] And / or, a pole arc angle β between two magnetic steels in each magnetic steel group is 40 degrees.

[0016] Optionally, the multiple groups of magnetic steel slots are distributed at equal intervals along the circumference of the rotor core.

[0017] On the other hand, a motor is provided, comprising: a rotor component and a stator core sleeved on the rotor component, wherein the rotor component is any one of the rotor components given above.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0019] A rotor component may include: a rotor core and a plurality of groups of magnetic steels. By reasonably setting the thickness h of the magnetic steel in the rotor component, the angle α between two magnetic steels in the rotor component, and / or the pole arc angle β between two magnetic steels using the above corresponding relationship, the PWM harmonic noise of the motor can be effectively improved while ensuring that the cost of the motor integrated with the rotor component is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a single V-shaped concentrated winding stator and rotor punching provided in an embodiment of the present application;

[0022] Figure 2 It is a structural schematic diagram of a 9-slot 6-pole single V-shaped concentrated winding stator and rotor punching provided in an embodiment of the present application.

[0023] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] Please refer to Figure 1 , Figure 1 It is a structural schematic diagram of a single V-shaped concentrated winding stator and rotor punching provided in an embodiment of the present application. The rotor component 000 in the embodiment of the present application can be installed in a motor, and the stator core 001 in the motor can be covered on the rotor component 000, and the rotor component 000 rotates under the action of magnetic force. For example, the motor can be a permanent magnet synchronous motor.

[0028] The rotor component 000 may include: a rotor core 100 and a plurality of magnetic steel groups.

[0029] The rotor core 100 may have a plurality of groups of magnetic steel slots 101 distributed along the circumference of the rotor core 100, and each group of magnetic steel slots 101 includes two intersecting magnetic steel slots 101. Here, the two intersecting magnetic steel slots 101 may form a V-shaped magnetic steel slot, and the opening of the V-shaped magnetic steel slot faces the stator core 001 in the motor.

[0030] The multiple magnetic steel groups in the rotor component 000 can correspond one-to-one to the multiple magnetic steel slots 101 in the rotor core 100, each magnetic steel group can include two magnetic steels 200, and the two magnetic steels 200 in each magnetic steel group can be embedded in the two magnetic steel slots 101 corresponding to this magnetic steel group.

[0031] The thickness of the magnetic steel in each magnetic steel group (mm) Among them, μ r is the relative magnetic permeability of magnetic steel 200; B r is the remanence of the magnetic steel; τ is the pole pitch; B g is the magnetic induction intensity in the air gap; δ is the magnetic leakage coefficient. The value range of k is: 1.1 to 1.3. It should be noted that when the magnetic steel 200 in the rotor component 000 is determined, the relative magnetic permeability, residual magnetism, pole pitch, magnetic induction intensity in the air gap and the magnetic leakage coefficient of the magnetic steel can all be determined.

[0032] It should be noted that the thickness h of the two magnetic steels 200 in each magnetic steel group may be equal, and the thickness h of the magnetic steels 200 in multiple magnetic steel groups may be the same.

[0033] In the embodiment of the present application, by reasonably setting the thickness h of the magnetic steel 200 in each magnetic steel group in the rotor component 000 using the above corresponding relationship, the PWM harmonic noise of the motor can be effectively improved while ensuring that the cost of the motor integrated with the rotor component 000 is low.

[0034] In summary, the embodiment of the present application provides a rotor component, which may include: a rotor core and a plurality of groups of magnetic steels. By reasonably setting the thickness h of the magnetic steel 200 in each magnetic steel group in the rotor component 000 using the above corresponding relationship, the PWM harmonic noise of the motor can be effectively improved while ensuring that the cost of the motor integrated with the rotor component 000 is low.

[0035] Optionally, the angle α between the two magnetic steels 200 in each magnetic steel group is 2π / GCD(Z, 2P)±1°, Z is the number of slots in the stator core 001 in the motor, and P is the number of pole pairs of the motor.

[0036] and / or, the pole arc angle β between the two magnetic steels 200 in each magnetic steel group is 2π / 3P±1°;

[0037] For example, the angle α between the two magnetic steels 200 in the rotor component 000, the pole arc angle β between the two magnetic steels 200, and the thickness h of the magnetic steel 200 satisfy the following optional implementations:

[0038] In a first optional implementation, the angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: α=2π / GCD(Z, 2P)±1°, and only the thickness of the magnetic steel 200 in each magnetic steel group in the rotor component satisfies the relationship:

[0039] In a second optional implementation, the pole arc angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: β = 2π / 3P ± 1°, and only the thickness of the magnetic steel 200 in each magnetic steel group in the rotor component 000 satisfies the relationship:

[0040] In a third optional implementation, the angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: α=2π / GCD(Z, 2P)±1°, and the pole arc angle between only the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: β=2π / 3P±1°, and the thickness of only the magnetic steel in each magnetic steel group in the rotor component satisfies the relationship:

[0041] It should be noted that the magnetic steel 200 in the rotor component 000 can be a permanent magnet.

[0042] In the embodiment of the present application, by reasonably setting the thickness h of the magnetic steel 200, and the angle α between the two magnetic steels 200 in the rotor component 000 and / or the pole arc angle β between the two magnetic steels using the above-mentioned corresponding relationship, the PWM harmonic noise of the motor can be effectively improved while ensuring that the cost of the motor integrated with the rotor component 000 is low.

[0043] The embodiment of the present application adopts the above relationship to design the following two motors integrated with the above rotor components:

[0044] like Figure 1 , Figure 1 The figure shows a schematic diagram of the structure of a 12-slot 8-pole single V-shaped concentrated winding stator and rotor punching provided by an embodiment of the present application. In the first 12-slot 8-pole motor integrated with a rotor component 000, the thickness h of the magnetic steel 200 in each magnetic steel group can range from 2.9 mm to 3.1 mm, or 3.9 mm to 4.1 mm, and the angle α between the two magnetic steels 200 in each magnetic steel group can range from 89 degrees to 91 degrees; and / or, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group can range from 29 degrees to 31 degrees.

[0045] For example, the thickness h of the magnetic steel 200 in each magnetic steel group can be 3 mm or 4 mm, the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group can be 90 degrees, and / or the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group can be 30 degrees. For example, the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group in the rotor component provided by the present application can be 90 degrees, the angle of the pole arc angle β between the two magnetic steels 200 in each group of magnetic steels can be 30 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm.

[0046] In other possible implementations, the thickness h of the magnetic steel 200 in each magnetic steel group may be 4 mm, and the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided in the present application may be 90 degrees. Alternatively, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 may be 30 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group may be 4 mm.

[0047] The embodiment of the present application schematically illustrates the influence of different angles α, pole arc angles β and magnetic steel thickness h on the noise of the motor through experiments. Please refer to the following Table 1:

[0048] Table 1

[0049]

[0050]

[0051] Note: The unit of rated power in the above table is KW, and the unit of rated speed is r / min.

[0052] It can be seen from the data in the above table 1 that in test example 9, when the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group, and the thickness h of the magnetic steel 200 in each magnetic steel group meet the above values, the noise value of the motor is 62.2, which is 12% lower than the noise value of 69.6 in the original scheme, and the noise value of the motor is also significantly reduced compared with the comparison scheme, indicating that the reasonable value of the angle α, the pole arc angle β and the magnetic steel thickness h can effectively improve the degree of reduction of PWM high-order harmonics, thereby reducing the noise of the motor and improving the user experience of the motor. In addition, it should be noted that it can also be seen from the data in the above table that in various test examples, only the angle α between the two magnetic steels 200 in each magnetic steel group, or only the value of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group is consistent with the value of the corresponding parameter in test example 9, which has almost no improvement effect on the reduction of PWM high-order harmonics. When the thickness h of the magnetic steel meets the corresponding parameter of Test Example 9 in the above table, and when any one of the angle α between the two magnetic steels 200 or the pole arc angle β between the two magnetic steels 200 further meets the corresponding parameter value of Test Example 9, the degree of reduction of PWM high-order harmonics can be improved, thereby improving the noise of the motor to a certain extent compared with the original solution. For example, the PWM high-order harmonic reduction rate in Test Example 3 is 3.5%, the PWM high-order harmonic reduction rate in Test Example 4 is 6%, the PWM high-order harmonic reduction rate in Test Example 5 is 1.3%, the PWM high-order harmonic reduction rate in Test Example 6 is 4.5%, the PWM high-order harmonic reduction rate in Test Example 7 is 4.5%, and the PWM high-order harmonic reduction rate in Test Example 8 is 10%.

[0053] Please refer to Figure 2 , Figure 2 It is a structural schematic diagram of a 9-slot 6-pole single V-shaped concentrated winding stator and rotor punching provided by an embodiment of the present application. In the second 9-slot 6-pole motor with integrated rotor components, the thickness h (mm) of the magnet 200 in each magnet group can range from 2.9 mm to 3.1 mm, or, 3.9 mm to 4.1 mm, and the angle α (°) between the two magnets 200 in each magnet group can range from 119 degrees to 121 degrees; and / or, the angle β (°) between the two magnets 200 in each magnet group can range from 39 degrees to 41 degrees.

[0054] For example, the thickness h of the magnetic steel 200 in each magnetic steel group can be 3 mm or 4 mm, the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group can be 120 degrees, and / or the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group can be 40 degrees. For example, the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided in the present application can be 120 degrees, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group can be 40 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm.

[0055] In other possible implementations, the thickness h of the magnetic steel 200 in each magnetic steel group may be 4 mm, and the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided in the present application may be 120 degrees. Alternatively, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 may be 40 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group may be 4 mm.

[0056] The embodiment of the present application schematically illustrates the influence of different angles α, pole arc angles β and magnetic steel thickness h on the noise of the motor through experiments, please refer to the following Table 2:

[0057] Table 2

[0058]

[0059] Note: The unit of rated power in the above table is KW, and the unit of rated speed is r / min.

[0060] It can be seen from the data in the above table 2 that in test example 9, when the angle value of the angle α between the two magnetic steels 200 in each magnetic steel group, the angle of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group, and the thickness h of the magnetic steel 200 in each magnetic steel group meet the above values, the noise value of the motor is 62.1, which is 12% lower than the noise value of 68.3 in the original scheme, and the noise value of the motor is also significantly reduced compared with the comparison scheme, indicating that the reasonable value of the angle α, the pole arc angle β and the magnetic steel thickness h can effectively improve the degree of reduction of PWM high-order harmonics, thereby reducing the noise of the motor and improving the user experience of the motor. In addition, it should be noted that it can also be seen from the data in the above table that in various test examples, only the angle α between the two magnetic steels 200 in each magnetic steel group, or only the value of the pole arc angle β between the two magnetic steels 200 in each magnetic steel group is consistent with the value of the corresponding parameter in test example 9, which has almost no improvement effect on the reduction of PWM high-order harmonics. When the thickness h of the magnetic steel meets the corresponding parameter of Test Example 9 in the above table, and when any one of the angle α between the two magnetic steels 200 or the pole arc angle β between the two magnetic steels 200 further meets the corresponding parameter value of Test Example 9, the degree of reduction of PWM high-order harmonics can be improved, thereby improving the noise of the motor to a certain extent compared with the original solution. For example, the PWM high-order harmonic reduction rate in Test Example 1 is 1%, the PWM high-order harmonic reduction rate in Test Example 3 is 3%, the PWM high-order harmonic reduction rate in Test Example 4 is 5%, the PWM high-order harmonic reduction rate in Test Example 5 is 1.5%, the PWM high-order harmonic reduction rate in Test Example 6 is 4.5%, the PWM high-order harmonic reduction rate in Test Example 7 is 4.5%, and the PWM high-order harmonic reduction rate in Test Example 8 is 11%.

[0061] In the present application, the multiple groups of magnetic steel slots 101 are distributed at equal intervals along the circumference of the rotor core 100. That is, the angles between two adjacent groups of magnetic steel slots 101 in the multiple groups of magnetic steel slots 101 are equal.

[0062] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0063] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor component, characterized in that: The rotor component is installed in the motor and includes: A rotor core, wherein the rotor core has a plurality of groups of magnetic steel slots distributed along the circumference of the rotor core, and each group of the magnetic steel slots includes two magnetic steel slots arranged in a V-shape; A plurality of magnetic steel groups, each of which corresponds to the plurality of magnetic steel slots, each of which comprises two magnetic steels, and the two magnetic steels in each of which are embedded in two corresponding magnetic steel slots; Wherein, the thickness of the magnetic steel in each magnetic steel group is Among them, μ r is the relative magnetic permeability of the magnetic steel; B r is the remanence of the magnetic steel; τ is the pole pitch; B g is the magnetic induction intensity in the air gap; δ is the leakage flux coefficient; the value range of k is: 1.1 to 1.

3.

2. The rotor component according to claim 1, characterized in that The angle α between the two magnetic steels in each magnetic steel group is 2π / GCD(Z, 2P)±1°, where Z is the number of stator core slots in the motor, and P is the number of pole pairs of the motor; And / or, the pole arc angle β between the two magnetic steels in each magnetic steel group is β=2π / 3P±1°.

3. The rotor component according to claim 2, characterized in that For a 12-slot 8-pole motor integrated with the rotor component, the thickness of the magnetic steel in each magnetic steel group is 3 mm or 4 mm.

4. The rotor component according to claim 2 or 3, characterized in that: For a 12-slot 8-pole motor integrated with the rotor component, the angle α between the two magnetic steels in each magnetic steel group is 90 degrees; And / or, a pole arc angle β between two magnetic steels in each magnetic steel group is 30 degrees.

5. The rotor component according to claim 2, characterized in that: For a 9-slot 6-pole motor integrated with the rotor component, the thickness of the magnetic steel in each magnetic steel group is 3 mm or 4 mm.

6. The rotor component according to claim 2 or 5, characterized in that: For a 9-slot 6-pole motor integrated with the rotor component, the angle α between the two magnetic steels in each magnetic steel group is 120 degrees; And / or, a pole arc angle β between two magnetic steels in each magnetic steel group is 40 degrees.

7. The rotor component according to claim 1, characterized in that The multiple groups of magnetic steel slots are distributed at equal intervals along the circumference of the rotor core.

8. A motor, characterized in that: include: A rotor component, and a stator core sleeved on the rotor component, wherein the rotor component is the rotor component described in any one of claims 1 to 7.

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