Rotor component and motor

Abstract

The utility model discloses a rotor component and a motor, 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, in particular to a rotor component and a motor. BACKGROUND

[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 have low winding ends, simple processing technology, and other characteristics, and are increasingly favored. However, due to the interaction between the stator harmonic magnetic field under the excitation of non-sinusoidal current in the rotation process of the motor and the rotor magnetic field generated by the permanent magnet, part of the electromagnetic force is used to drive the motor to rotate, and the other part acts on the stator teeth to produce electromagnetic noise. The electromagnetic noise has high frequency and strong penetration, and often causes people's auditory discomfort. In particular, the electromagnetic noise generated by the PWM harmonics of the frequency converter acting on the permanent magnet synchronous motor is particularly serious. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a rotor component and a motor. The problem of the electromagnetic noise generated by the PWM harmonics of the frequency converter acting on the permanent magnet synchronous motor being particularly serious in the prior art can be solved, and the technical solution is as follows:

[0004] On the one hand, a rotor component is provided, which is installed in a motor, and the rotor component comprises:

[0005] A rotor core, the rotor core has a plurality of groups of magnetic steel grooves distributed along the circumference of the rotor core, each group of the magnetic steel grooves comprises two magnetic steel grooves arranged in a V shape;

[0006] A plurality of magnetic steel groups, the plurality of magnetic steel groups correspond one-to-one to the plurality of groups of magnetic steel grooves, each of the magnetic steel groups comprises two magnetic steels, and the two magnetic steels in each of the magnetic steel groups are embedded in the corresponding two magnetic steel grooves;

[0007] Wherein, the thickness of the magnetic steels in each of the magnetic steel groups is Wherein, μ r is the relative magnetic permeability of the magnetic steel; B r is the residual magnetism of the magnetic steel; τ is the pole pitch; B g is the magnetic induction intensity in the air gap; δ is the leakage coefficient; and the value range of k is 1.1 to 1.3.

[0008] Optionally, the included angle α between the two magnetic steels in each of the magnetic steel groups 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 included angle β between the two magnetic steels in each of the magnetic steel groups is 2π / 3P±1°.

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

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

[0012] Optionally, for the motor integrated with the rotor component of 12-slot 8-pole, the included angle a between two magnetic steels in each magnetic steel group is 90 degrees.

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

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

[0015] Optionally, for the motor integrated with the rotor component of 9-slot 6-pole, the included angle a between two magnetic steels in each magnetic steel group is 120 degrees.

[0016] Optionally, the plurality of magnetic steel groups are distributed equidistantly along the circumference of the rotor core.

[0017] In another aspect, a motor is provided, which includes a rotor component and a stator core sleeved on the rotor component, and the rotor component is any of the rotor components given in the above.

[0018] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

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

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a structure diagram of a single V-type centralized winding stator lamination provided by the embodiments of the present application;

[0022] Figure 2 Figure 1 is a structural schematic diagram of a 9-slot 6-pole single V-type concentrated winding rotor lamination provided by an embodiment of the present application.

[0023] The specific embodiments have been shown and described in the foregoing detailed description. It will be understood by those skilled in the art, however, that the application is not limited to the specific embodiments described, since variations and modifications exist. The application includes all such variations and modifications. The scope of the application should be determined by a fair reading of the appended claims, together with the full range of equivalents to which such claims are entitled. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in conjunction with the drawings.

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0026] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily mean the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0027] Reference should be made to Figure 1 , Figure 1 Figure 1 is a structural schematic diagram of a single V-type concentrated winding rotor lamination provided by 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 sleeved 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 can include a rotor core 100 and a plurality of magnetic steel groups.

[0029] The rotor core 100 can 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 magnetic steel slots 101 arranged in intersection. Here, the two magnetic steel slots 101 arranged in intersection can 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 plurality of magnetic steel groups in the rotor component 000 can correspond to the plurality of groups of magnetic steel slots 101 in the rotor core 100 one by one, 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 the magnetic steel group.

[0031] wherein the thickness (mm) of the magnetic steel in each magnetic steel group

[0032] wherein μ r is the relative permeability of the magnetic steel 200; B r is the residual magnetism of the magnetic steel; τ is the pole pitch; B g is the magnetic induction in the air gap; δ is the leakage coefficient. The value range of k is 1.1 to 1.3. It should be noted that the values of the relative permeability, residual magnetism, pole pitch, magnetic induction in the air gap, and leakage coefficient of the magnetic steel 200 can be determined when the magnetic steel 200 in the rotor component 000 is determined.

[0033] It should be noted that the thickness h of the two magnetic steels 200 in each magnetic steel group can be equal, and the thickness h of the magnetic steels 200 in the plurality of magnetic steel groups can be the same.

[0034] In the embodiments 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 corresponding relationship formula described above, the PWM harmonic noise of the motor integrated with the rotor component 000 can be effectively improved while ensuring that the cost of the motor is relatively low.

[0035] In summary, the embodiments of the present application provide a rotor component, which can include a rotor core and a plurality of magnetic steel groups. By reasonably setting the thickness h of the magnetic steel 200 in each magnetic steel group in the rotor component 000 using the corresponding relationship formula described above, the PWM harmonic noise of the motor integrated with the rotor component 000 can be effectively improved while ensuring that the cost of the motor is relatively low.

[0036] Optionally, the included angle α between the two magnetic steels 200 in each magnetic steel group is 2π / GCD(Z, 2P)±1°, Z is the slot number of the stator core 001 in the motor, and P is the pole pair number of the motor.

[0037] And / or, the pole arc included angle β between the two magnetic steels 200 in each magnetic steel group is 2π / 3P±1°.

[0038] For example, the included angle α between the two magnetic steels 200 in the rotor component 000 described above, the pole arc included angle β between the two magnetic steels 200, and the thickness h of the magnetic steel 200 satisfy the following several optional implementation manners:

[0039] In the first alternative implementation, the included angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: a = 2p / GCD(Z, 2P) ± 1°, and only the thickness of the magnetic steels 200 in each magnetic steel group in the rotor component satisfies the relationship:

[0040] In the second alternative implementation, the pole-arc included angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: b = 2p / 3P ± 1°, and only the thickness of the magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship:

[0041] In the third alternative implementation, the included angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: a = 2p / GCD(Z, 2P) ± 1°, and only the pole-arc included angle between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 satisfies the relationship: b = 2p / 3P ± 1°, and only the thickness of the magnetic steels in each magnetic steel group in the rotor component satisfies the relationship:

[0042] It should be noted that the magnetic steels 200 in the rotor component 000 can be permanent magnets.

[0043] In the embodiments of the present application, by reasonably setting the thickness h of the magnetic steels 200, and the included angle a between the two magnetic steels 200 in the rotor component 000 and / or the pole-arc included angle b between the two magnetic steels in the rotor component 000 using the above corresponding relationships, the PWM harmonic noise of the motor integrated with the rotor component 000 can be effectively improved while ensuring that the cost of the motor is low.

[0044] The embodiments of the present application use the above relationships to design the following two motors integrated with the above rotor component:

[0045] As shown in Figure 1 , Figure 1 is a structure schematic diagram of a 12-slot 8-pole single-V concentrated winding fixed rotor lamination provided by the embodiments of the present application. The thickness h of the magnetic steels 200 in each magnetic steel group in the first 12-slot 8-pole motor integrated with the rotor component 000 can be in the range of 2.9 millimeters to 3.1 millimeters, or 3.9 millimeters to 4.1 millimeters, and the included angle a between the two magnetic steels 200 in each magnetic steel group can be in the range of 89 degrees to 91 degrees; and / or, the pole-arc included angle b between the two magnetic steels 200 in each magnetic steel group can be in the range of 29 degrees to 31 degrees.

[0046] 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 included angle a between the two magnetic steels 200 in each magnetic steel group can be 90 degrees, and / or the angle of the pole-arc included angle β between the two magnetic steels 200 in each magnetic steel group can be 30 degrees. For example, the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group in the rotor component provided in the application can be 90 degrees, the angle of the pole-arc included angle β between the two magnetic steels 200 in each magnetic steel group can be 30 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm.

[0047] In other possible implementations, the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm, and the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided in the application can be 90 degrees. Alternatively, the angle of the pole-arc included angle β between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 can be 30 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm.

[0048] The influence of different included angles a, pole-arc included angles β and thicknesses h of the magnetic steels on the noise of the motor is schematically illustrated by experiments in the embodiments of the application. Please refer to Table 1 below:

[0049] Table 1

[0050]

[0051]

[0052] Note: The unit of the rated power in the above table is KW, and the unit of the rated rotating speed is r / min.

[0053] From the data in Table 1, it can be seen that in Test Example 9, when the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group, the angle of the pole arc included 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 satisfy the above values, the value of the noise of the motor is 62.2, which is reduced by 12% compared with the noise value 69.6 in the original scheme, and the noise value of the motor is also significantly reduced compared with the comparative scheme. It is indicated that by reasonably selecting the included angle a, the pole arc included angle β and the thickness h of the magnetic steel, the degree of PWM high harmonic reduction can be effectively improved, thereby reducing the noise of the motor and improving the use experience of the motor. In addition, it should be noted that from the data in the above table, it can be seen that in various test examples, only the value of the included angle a between the two magnetic steels 200 in each magnetic steel group, or only the value of the pole arc included 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. The PWM high harmonic reduction has little effect on improvement. And in the case where the thickness h of the magnetic steel satisfies the corresponding parameter in Test Example 9 in the above table, further making any one of the included angle a between the two magnetic steels 200 or the pole arc included angle β between the two magnetic steels 200 satisfy the corresponding parameter value in Test Example 9, the degree of PWM high harmonic reduction can be improved, and the noise of the motor is improved to a certain extent compared with the original scheme. For example, the PWM high harmonic reduction rate is 3.5% in Test Example 3, 6% in Test Example 4, 1.3% in Test Example 5, 4.5% in Test Example 6, 4.5% in Test Example 7, and 10% in Test Example 8.

[0054] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a 9-slot 6-pole single V-type concentrated winding rotor lamination provided by the embodiments of the present application. The second kind of 9-slot 6-pole motor integrated with a rotor component, the thickness h (mm) of the magnetic steel 200 in each magnetic steel group can be in the range of 2.9 mm to 3.1 mm, or 3.9 mm to 4.1 mm, and the included angle a (°) between the two magnetic steels 200 in each magnetic steel group can be in the range of 119 degrees to 121 degrees; and / or, the pole arc included angle β (°) between the two magnetic steels 200 in each magnetic steel group can be in the range of 39 degrees to 41 degrees.

[0055] 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 included angle a between the two magnetic steels 200 in each magnetic steel group can be 120 degrees, and / or the angle of the pole-arc included angle β between the two magnetic steels 200 in each magnetic steel group can be 40 degrees. For example, the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided by the present application can be 120 degrees, the angle of the pole-arc included 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.

[0056] In other possible implementations, the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm, and the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 provided by the present application can be 120 degrees. Alternatively, the angle of the pole-arc included angle β between the two magnetic steels 200 in each magnetic steel group in the rotor component 000 can be 40 degrees, and the thickness h of the magnetic steel 200 in each magnetic steel group can be 4 mm.

[0057] The present application illustrates the influence of different included angles a, pole-arc included angles β and thicknesses h of the magnetic steels on the noise of the motor through experiments. Please refer to Table 2 below:

[0058] Table 2

[0059]

[0060] Note: The unit of the rated power in the above table is KW, and the unit of the rated rotating speed is r / min.

[0061] As can be seen from the data in Table 2, in the test example 9, when the angle value of the included angle a between the two magnetic steels 200 in each magnetic steel group, the angle value of the pole arc included 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 satisfy the above values, the value of the noise of the motor is 62.1, which is reduced by 12% compared with the value of the noise of the original scheme 68.3, and is also significantly reduced compared with the noise value of the motor of the comparative scheme, indicating that through reasonable selection of the included angle a, the pole arc included angle β and the thickness h of the magnetic steel, the degree of PWM high harmonic reduction can be effectively improved, thereby reducing the noise of the motor and improving the use experience of the motor. In addition, it should be noted that from the data in the above table, it can be seen that in various test examples, only the value of the included angle a between the two magnetic steels 200 in each magnetic steel group, or only the value of the pole arc included angle β between the two magnetic steels 200 in each magnetic steel group is consistent with the value of the corresponding parameter in the test example 9, which has little effect on the improvement of PWM high harmonic reduction. However, when the thickness h of the magnetic steel satisfies the corresponding parameter in the above table in the test example 9, and any one of the included angle a between the two magnetic steels 200 or the pole arc included angle β between the two magnetic steels 200 satisfies the corresponding parameter value in the test example 9, the degree of PWM high harmonic reduction can be improved, thereby improving the noise of the motor to a certain extent compared with the original scheme. For example, the PWM high harmonic reduction rate is 1% in the test example 1, 3% in the test example 3, 5% in the test example 4, 1.5% in the test example 5, 4.5% in the test example 6, 4.5% in the test example 7, and 11% in the test example 8.

[0062] In the present application, the plurality of magnetic steel grooves 101 are distributed equidistantly along the circumference of the rotor core 100. That is, the included angle between two adjacent magnetic steel grooves 101 in the plurality of magnetic steel grooves 101 is equal.

[0063] In the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise explicitly limited.

[0064] The above description is only an optional embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor component characterized by, The rotor component is installed in a motor, comprising: a rotor core having a plurality of groups of magnetic steel slots distributed along the circumference of the rotor core, each group of the magnetic steel slots comprising two magnetic steel slots arranged in a V shape; a plurality of magnetic steel groups corresponding to the plurality of groups of magnetic steel slots one-to-one, each magnetic steel group comprising two magnetic steels, the two magnetic steels in each magnetic steel group being embedded in the corresponding two magnetic steel slots; The thickness of the magnetic steel in each magnetic steel group Wherein, μ r is the relative magnetic permeability of the magnetic steel; B r is the residual magnetism of the magnetic steel; τ is the pole pitch; B g is the magnetic induction intensity in the air gap; δ is the leakage magnetic coefficient; and k is in the range of 1.1 to 1.

3.

2. The rotor component of claim 1, wherein an included angle α between the two magnetic steels in each magnetic steel group is 2π / GCD(Z, 2P)±1°, Z is the number of slots of a stator core in the motor, and P is the number of pole pairs of the motor; and / or, a pole arc included angle β between the two magnetic steels in each magnetic steel group is 2π / 3P±1°.

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

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

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

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

7. The rotor component of claim 1, wherein The plurality of groups of magnetic steel slots are distributed equidistantly along the circumference of the rotor core.

8. An electric machine characterized by Comprise: a rotor component, and a stator core sleeved on the rotor component, the rotor component being the rotor component of any one of claims 1-7.

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