CN211456835U - Reluctance-assisted rotor assembly of permanent magnet motor - Google Patents
Reluctance-assisted rotor assembly of permanent magnet motor Download PDFInfo
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- CN211456835U CN211456835U CN202020201011.7U CN202020201011U CN211456835U CN 211456835 U CN211456835 U CN 211456835U CN 202020201011 U CN202020201011 U CN 202020201011U CN 211456835 U CN211456835 U CN 211456835U
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Abstract
The utility model provides a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance corresponds a stator slot number of a stator subassembly and has a rotor pole number to contain a rotor center pin, a permanent magnet motor rotor core, a plurality of permanent magnet and two magnetic resistance rotor clamp plates. The permanent magnet motor rotor core takes the rotor central shaft as the center and is divided into a plurality of permanent magnet sector areas corresponding to the number of the rotor poles, and each permanent magnet sector area is provided with a first central line. The permanent magnets are arranged corresponding to the permanent magnet sector areas. Each reluctance rotor pressure plate is provided with a plurality of equally-divided sector guide areas corresponding to the number of the rotor poles, each sector guide area is provided with a second central line, and at least one magnetic conduction through hole which is the same in number and is symmetrical to the second central line is formed in each sector guide area. The first central line deviates from the second central line, so as to reduce torque ripple, reduce vibration and noise thereof, and further improve output torque.
Description
Technical Field
The utility model relates to an subassembly especially relates to a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance.
Background
A motor, also called as an electric motor or an electric motor, is an electrical apparatus that converts electric energy into kinetic energy and can be used to drive other devices, and is widely used in the life today. Wherein the permanent magnet motor is one of a variety of motors.
Generally, the main source of the vibration noise of the motor is the torque ripple of the motor, and therefore, the torque ripple needs to be reduced if the noise is reduced. In the prior art, the means adopted by the permanent magnet motor to reduce the torque ripple often changes the shape of the rotor (arc cutting) or the arrangement position of the rotor and the stator (inclined groove). However, the above measures reduce the torque ripple, but also make the manufacturing process complicated, and at the same time, reduce the output torque. Thus, the prior art means of reducing torque ripple have room for improvement.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the torque ripple reduction leads to a complicated manufacturing process and a concomitant reduction in output torque. A primary object of the present invention is to provide a reluctance-assisted rotor assembly for a permanent magnet motor, which solves at least one problem in the prior art.
The utility model discloses a solve prior art's problem, the necessary technological means who adopts is for providing a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance, corresponds a stator slot number of a stator subassembly and has a rotor number of poles, contains a rotor center pin, a permanent magnet motor rotor core, a plurality of permanent magnet and two magnetic resistance rotor clamp plates.
The permanent magnet motor rotor core is arranged on the rotor central shaft in a penetrating mode, is provided with a first end portion and a second end portion, and is divided into a plurality of permanent magnet sector areas corresponding to the number of rotor poles by taking the rotor central shaft as the center, and each permanent magnet sector area is provided with a first central line. The permanent magnet is arranged on the rotor iron core of the permanent magnet motor corresponding to the permanent magnet sector area. The two reluctance rotor pressing plates are respectively connected with the first end part and the second end part, each reluctance rotor pressing plate is provided with a plurality of equally-divided sector guide areas corresponding to the number of rotor poles, each sector guide area is provided with a second central line, and at least one magnetic conduction through hole which is the same in number and is symmetrical to the second central line is formed in each sector guide area. The first central line of each permanent magnet fan-shaped area deviates from the second central line of each fan-shaped area.
Based on the above-mentioned necessary technical means, the present invention is derived from an auxiliary technical means for providing a straight line segment for each magnetic conductive through hole in the reluctance-assisted rotor assembly of the permanent magnet motor.
Under the basis of above-mentioned necessary technical means, the utility model discloses an affiliated technical means that derives has two extension sections for making each magnetic conduction through-hole in the supplementary type rotor subassembly of magnetic resistance of permanent-magnet motor, and two extension sections extend from the both ends of straightway rotor center pin dorsad.
Under the basis of the above-mentioned necessary technical means, the utility model discloses a permanent magnet motor rotor core in the supplementary type rotor subassembly of magnetic resistance for making permanent magnet motor that derives has seted up an accommodation channel in each permanent magnet sector area, and each permanent magnet corresponds each permanent magnet sector area and sets up in the accommodation channel.
Based on the above-mentioned necessary technical means, the present invention provides an auxiliary technical means for providing a permanent magnet motor rotor core in a reluctance-assisted rotor assembly of a permanent magnet motor with an outer peripheral surface, wherein each permanent magnet is disposed on the outer peripheral surface corresponding to each permanent magnet sector area.
Based on the above-mentioned necessary technical means, the present invention is derived to provide an included angle between the first central line of each permanent magnet sector area in the reluctance-assisted rotor assembly of the permanent magnet motor and the second central line of each guide sector area, and the included angle is between 0 ° and 23 °.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to make each permanent magnet in the reluctance-assisted rotor assembly of the permanent magnet motor be one of an ndfeb magnet and a ferrite magnet.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to make the shape of each magnetic conductive through hole in the reluctance-assisted rotor assembly of the permanent magnet motor different from the shape of the permanent magnet.
Bearing the above, the utility model provides a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance compares in prior art, can utilize magnetic resistance rotor clamp plate under the condition that does not change rotor shape (cut arc) or rotating stator setting position (chute), reaches the efficiency that reduces torque ripple, but also can further promote output torque. In addition, the reluctance rotor pressing plate and the permanent magnet motor rotor iron core deviate from each other, and the effect of propping against and fixing the permanent magnet can be achieved.
Drawings
Fig. 1 is a perspective view illustrating a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention;
fig. 2 is an exploded perspective view illustrating a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention;
fig. 3 is a front view of a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention;
FIG. 4 is a cross-sectional view showing A-A of FIG. 1; and
fig. 5 is a schematic diagram showing an output torque waveform of the reluctance-assisted rotor assembly of the permanent magnet motor according to the preferred embodiment of the present invention.
Description of the reference numerals
1: reluctance-assisted rotor assembly of permanent magnet motor
11 central axis of rotor
12 permanent magnet motor rotor core
121: accommodating channel
122 outer peripheral surface
13a,13b reluctance rotor pressure plate
131a magnetic conductive through hole
1311a straight line segment
1312a,1313a extension
14 permanent magnet
A is the included angle
A11, A12, A13 and A14 permanent magnet sector regions
A21, A22, A23, A24 pilot regions
L11, L12, L13, L14 first center line
L21, L21', L22, L23, L24, second centerline
E1 first end
E2 second end
W composite torque waveform
W1 permanent magnet torque waveform
W2 reluctance Torque waveform
X is axial direction
Detailed Description
The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic perspective view illustrating a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention; fig. 2 is an exploded perspective view illustrating a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention; fig. 3 is a front view of a reluctance-assisted rotor assembly of a permanent magnet motor according to a preferred embodiment of the present invention; and, FIG. 4 is a cross-sectional view showing A-A of FIG. 1. As shown in the figure, a reluctance-assisted rotor assembly 1 of a permanent magnet motor comprises a rotor central shaft 11, a permanent magnet motor rotor core 12, two reluctance rotor pressing plates 13a and 13b and a plurality of permanent magnets (four are drawn and one of the permanent magnets 14 is indicated).
The reluctance-assisted rotor assembly 1 of the permanent magnet motor has a rotor pole number corresponding to a stator slot number of a stator assembly. The number of the rotor poles can be 2 poles, 4 poles, 6 poles, 8 poles, 12 poles and the like.
The rotor central shaft 11 extends along an axial direction X and sequentially penetrates through the reluctance rotor pressing plate 13a, the permanent magnet motor rotor core 12 and the reluctance rotor pressing plate 13 b.
The permanent magnet motor rotor core 12 has a first end E1 and a second end E2, and is divided into a plurality of permanent magnet sector areas a11, a12, a13, a14 corresponding to the number of rotor poles with the rotor central axis 11 as the center. Each permanent magnet sector area a11, a12, a13, a14 has a first center line L11, L12, L13, L14, respectively.
The permanent magnets 14 are provided in the permanent magnet motor rotor core 12 corresponding to the permanent magnet sectoral regions a11, a12, a13, and a 14. In the present embodiment, the permanent magnet motor rotor core 12 has a plurality of accommodating channels 121 corresponding to the permanent magnet sector areas a11, a12, a13, a14, and the permanent magnets 14 are correspondingly disposed in the accommodating channels 121, but not limited thereto. In other embodiments of the present invention, the permanent magnet motor rotor core 12 has an outer peripheral surface 122, and the permanent magnets 14 may be disposed on the outer peripheral surface 122 of the permanent magnet motor rotor core 12 corresponding to the permanent magnet sector areas a11, a12, a13, and a 14. The permanent magnet 14 may be a natural magnet or an artificial magnet, and in the embodiment, the permanent magnet 14 is a neodymium iron boron magnet or a ferrite magnet.
The reluctance rotor pressing plate 13a is connected to the first end E1 of the permanent magnet motor rotor core 12, and the reluctance rotor pressing plate 13b is connected to the second end E2 of the permanent magnet motor rotor core 12. The reluctance rotor pressure plate 13a and the reluctance rotor pressure plate 13b are the same component, and are given different reference numerals for the sake of explanation, and only the reluctance rotor pressure plate 13a will be described in detail below.
The reluctance rotor pressing plate 13a has a plurality of sector guiding areas a21, a22, a23 and a24 equally divided corresponding to the number of rotor poles, and each sector guiding area a21, a22, a23 and a24 has a second central line L21, L22, L23 and L24 respectively. The reluctance rotor pressure plate 13a is provided with at least one magnetic conduction through hole in each of the magnetic conduction areas a21, a22, a23 and a24, wherein the magnetic conduction through holes are identical in number and symmetrical to the second center lines L21, L22, L23 and L24. In this embodiment, the number of the at least one magnetic through hole is four, and one of the magnetic through holes 131a is indicated.
The magnetic conductive via 131a is located in the conductive sector a21, and is symmetrical to the second center line L21 of the conductive sector a 21. In the present embodiment, the magnetic conductive via 131a has a straight line segment 1311a and two extending segments 1312a and 1313 a. The extending sections 1312a and 1313a extend from the opposite ends of the straight section 1311a, respectively, and face away from the rotor center axis 11.
The reluctance rotor pressing plates 13a and 13b must have magnetic permeability to generate reluctance force, and the pressing plate thickness of the reluctance rotor pressing plates 13a and 13b is in direct proportion to the generated reluctance force. The pilot sector areas a21, a22, a23 and a24 correspond to the number of rotor poles, and the permanent magnet sector areas a11, a12, a13 and a14 also correspond to the number of rotor poles, so the pilot sector areas a21, a22, a23 and a24 correspond to the permanent magnet sector areas a11, a12, a13 and a14, and the number of the two areas is equal.
The first center lines L11, L12, L13 and L14 of the permanent magnet sector areas a11, a12, a13 and a14 and the second center lines L21, L22, L23 and L24 of the guide sector areas a21, a22, a23 and a24 are deviated from each other by an angle a.
As shown in fig. 2, the second center line L21 is projected to the permanent magnet motor rotor core 12 along the axial direction X and is designated as a second center line L21'. The second center line L21' forms an angle a with the first center line L11 of the permanent magnet sector a 11. In the present embodiment, the included angle a is 22.5 °, but not limited thereto. If the number of the rotor poles is P, the included angle A ranges from 0 DEG to
And contains 0 DEG and
since the second center line L21' is offset from the first center line L11 by an angle a, which means that the second center line L21 is also offset from the first center line L11 by an angle a, it can be regarded that the reluctance rotor pressing plates 13a and 13b are offset from the permanent magnet motor rotor core 12 by an angle a. Because the reluctance rotor pressing plates 13a and 13b and the permanent magnet motor rotor core 12 are deviated from each other, the reluctance rotor pressing plates 13a and 13b can also achieve the effect of abutting against and fixing the permanent magnets 14 in the accommodating passage 121. Preferably, the shape of the magnetic permeable through hole 131a is different from the shape of the permanent magnet 14.
More specifically, the projected area of the reluctance rotor pressing plate 13a on the permanent magnet motor rotor core 12 along the axial direction X at least partially covers the permanent magnet 14, so as to achieve the effect of abutting and fixing the permanent magnet 14.
Finally, please refer to fig. 1 to 5, wherein fig. 5 is a schematic diagram illustrating an output torque waveform of the reluctance-assisted rotor assembly of the permanent magnet motor according to the preferred embodiment of the present invention.
The permanent magnet motor rotor core 12 outputs a permanent magnet torque waveform W1, and the reluctance rotor pressing plates 13a and 13b output a reluctance torque waveform W2. The magnetic resistance auxiliary rotor assembly 1 of the permanent magnet motor provided in the preferred embodiment of the present invention includes the permanent magnet motor rotor core 12 and the magnetic resistance rotor pressing plates 13a and 13b, so as to output the resultant torque waveform W.
As is apparent from the waveform diagram, the resultant torque waveform W is significantly reduced in torque ripple compared to the permanent magnet torque waveform W1 by the cancellation and assistance of the reluctance torque waveform W2, and the output torque is not only not reduced in conjunction with this but also increased upward.
Referring to the expression for output torque together, the equation is as follows:
wherein P is the number of rotor poles, λmThe flux linkage generated by the permanent magnets 14 on the stator windings of the stator assembly can be considered as a permanent magnet torque component in the output torque. L isd、LqInductances of d-and q-axes, id、iqThe components of the stator current space vector in the d-axis and q-axis, respectively. The permanent magnet torque waveform W1 corresponds to the above equation.
The utility model provides a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance 1, except that permanent magnet motor rotor core 12 still contains magnetic resistance rotor clamp plate 13a,13b, therefore, the expression of output torque will be modified as follows:
wherein, reluctance rotor clamp plate 13a,13b correspond to the newly-increased item of formula and time, can further prove from the formula, the utility model discloses an output torque will have and promote to some extent. It can be seen from the figure that the output torque is not only increased, but also the torque ripple is reduced. In the drawings, the axis of ordinate is torque, and the axis of abscissa is time.
In conclusion, because the utility model provides a permanent magnet motor's supplementary type rotor subassembly of magnetic resistance, compare in prior art, can utilize magnetic resistance rotor clamp plate under the condition that does not change rotor shape (cut arc) or stator setting position (chute), reach the efficiency that reduces torque ripple, but also can further promote output torque. In addition, the reluctance rotor pressing plate and the permanent magnet motor rotor iron core deviate from each other, and the effect of propping against and fixing the permanent magnet can be achieved.
The foregoing detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Claims (8)
1. A reluctance-assisted rotor assembly of a permanent magnet motor, having a number of rotor poles corresponding to the number of stator slots of a stator assembly, comprising:
a rotor central shaft;
a permanent magnet motor rotor core, which is arranged through the rotor central shaft, has a first end part and a second end part, and is divided into a plurality of permanent magnet sector areas corresponding to the number of the rotor poles by taking the rotor central shaft as the center, wherein each permanent magnet sector area has a first central line;
a plurality of permanent magnets provided on the permanent magnet motor rotor core corresponding to the plurality of permanent magnet sector areas; and
the two reluctance rotor pressing plates are respectively connected with the first end part and the second end part, each reluctance rotor pressing plate is provided with a plurality of equally-divided sector guide areas corresponding to the number of the rotor poles, each sector guide area is provided with a second central line, and at least one magnetic conduction through hole which is the same in number and is symmetrical to the second central line is formed in each sector guide area;
wherein the first center line of each of the plurality of permanent magnet sector areas is offset from the second center line of each of the plurality of sector areas.
2. The reluctance-assisted rotor assembly according to claim 1, wherein each of the magnetic conductive through holes has a straight line segment.
3. The reluctance-assisted rotor assembly according to claim 2, wherein each of the magnetic conductive through holes has two extending sections extending from two ends of the straight section back to the central axis of the rotor.
4. The reluctance-assisted rotor assembly according to claim 1, wherein the permanent magnet motor rotor core has a receiving channel formed in each of the plurality of permanent magnet sectors, and each of the plurality of permanent magnets is disposed in the receiving channel corresponding to each of the plurality of permanent magnet sectors.
5. The reluctance-assisted rotor assembly according to claim 1, wherein the permanent magnet motor rotor core has an outer circumferential surface, and each of the plurality of permanent magnets is disposed on the outer circumferential surface corresponding to each of the plurality of permanent magnet sector areas.
6. The reluctance-assisted rotor assembly according to claim 1, wherein an included angle exists between the first centerline of each of the plurality of permanent magnet sector regions and the second centerline of each of the plurality of conducting sector regions, and the included angle is between 0 ° and 23 °.
7. The reluctance-assisted rotor assembly according to claim 1, wherein each of the plurality of permanent magnets is one of a neodymium-iron-boron magnet and a ferrite magnet.
8. The reluctance-assisted rotor assembly according to claim 1, wherein each of the plurality of magnetic conductive through holes has a shape different from the plurality of permanent magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020201011.7U CN211456835U (en) | 2020-02-24 | 2020-02-24 | Reluctance-assisted rotor assembly of permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020201011.7U CN211456835U (en) | 2020-02-24 | 2020-02-24 | Reluctance-assisted rotor assembly of permanent magnet motor |
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| CN211456835U true CN211456835U (en) | 2020-09-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039239A (en) * | 2020-09-07 | 2020-12-04 | 珠海格力电器股份有限公司 | Rotor pressing plate for permanent magnet synchronous motor and permanent magnet synchronous motor |
| CN112688511A (en) * | 2020-12-10 | 2021-04-20 | 山东大学 | Asymmetric integrated rotor type permanent magnet synchronous reluctance motor, method and application |
| CN114400809A (en) * | 2021-12-30 | 2022-04-26 | 中车永济电机有限公司 | Axial superposition type permanent magnet auxiliary synchronous reluctance motor rotor structure |
-
2020
- 2020-02-24 CN CN202020201011.7U patent/CN211456835U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039239A (en) * | 2020-09-07 | 2020-12-04 | 珠海格力电器股份有限公司 | Rotor pressing plate for permanent magnet synchronous motor and permanent magnet synchronous motor |
| CN112688511A (en) * | 2020-12-10 | 2021-04-20 | 山东大学 | Asymmetric integrated rotor type permanent magnet synchronous reluctance motor, method and application |
| CN114400809A (en) * | 2021-12-30 | 2022-04-26 | 中车永济电机有限公司 | Axial superposition type permanent magnet auxiliary synchronous reluctance motor rotor structure |
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