Rotor, permanent magnet synchronous motor and compressor

Abstract

The application discloses a rotor, which comprises a rotor body, at least one magnetic steel slot and at least one q-axis magnetic isolation hole are arranged on the rotor body, the q-axis magnetic isolation hole is located at the left and / or right end of the magnetic steel slot, a d-axis magnetic isolation hole is further arranged on the rotor body, the d-axis magnetic isolation hole is communicated with the q-axis magnetic isolation hole, and the left and right sides of the d-axis magnetic isolation hole are provided with a first magnetic isolation structure and a second magnetic isolation structure. The rotor can effectively change the magnetic circuit track, reduce the tooth slot torque, reduce the torque ripple, reduce the speed fluctuation, and then can improve the positioning accuracy of motor control, reduce the starting difficulty, improve the low-speed control effect, and effectively reduce the motor vibration and noise caused by the torque ripple.

Description

TECHNICAL FIELD

[0001] The present application relates to rotor technology, in particular to a rotor, a permanent magnet synchronous motor and a compressor. BACKGROUND

[0002] The permanent magnet synchronous motor is mainly composed of a rotor, an end cover and a stator, and has the characteristics of simple structure, small size, light weight, small loss and high efficiency. Compared with a direct current motor, the permanent magnet synchronous motor has no commutator and brush, which brings inconvenience to the application. Compared with an asynchronous motor, the permanent magnet synchronous motor is relatively simple, the stator current and stator resistance loss are reduced, and the rotor parameters can be measured and the control performance is good.

[0003] However, the cogging torque of the motor rotor is too large, the torque ripple is too strong, and the speed fluctuation is too high. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a rotor. The rotor can effectively change the magnetic circuit trajectory, reduce the cogging torque, reduce the torque ripple and reduce the speed fluctuation.

[0005] The above-mentioned problems to be solved by the present application are solved by the following technical scheme:

[0006] A rotor comprises a rotor body, at least one magnetic steel slot and at least one q-axis magnetic isolation hole are arranged on the rotor body, the q-axis magnetic isolation hole is located at the left and / or right end of the magnetic steel slot; a d-axis magnetic isolation hole is further arranged on the rotor body, and the d-axis magnetic isolation hole is in communication with the q-axis magnetic isolation hole, and first and second magnetic isolation substructures are arranged at the left and right sides of the d-axis magnetic isolation hole.

[0007] Preferably, the first magnetic isolation substructure comprises a first main arc portion, a first straight line portion and a first auxiliary arc portion, the first main arc portion is located at one side of the inner top portion of the d-axis magnetic isolation hole and communicates with the outer circle of the rotor body, one end of the first straight line portion is connected with one end of the first main arc portion, the other end of the first straight line portion is connected with one end of the first auxiliary arc portion, and the other end of the first auxiliary arc portion is in communication with the q-axis magnetic isolation hole.

[0008] Preferably, the second magnetic isolation substructure comprises a second main arc portion, a second straight line portion and a second auxiliary arc portion, the second main arc portion is located at the other side of the inner top portion of the d-axis magnetic isolation hole and communicates with the outer circle of the rotor body, one end of the second straight line portion is connected with one end of the second main arc portion, the other end of the second straight line portion is connected with one end of the second auxiliary arc portion, and the other end of the second auxiliary arc portion is in communication with the q-axis magnetic isolation hole.

[0009] Preferably, the first auxiliary arc part forms a circle center P1 with the second main arc part forming a circle center P2 with the same diameter, and the value ranges: 5.2mm

[0010] Preferably, the circle center P2 and the circle center P1 form a line L1 with the range: 4mm

[0011] Preferably, the first main arc part forms a circle center P3 with the second auxiliary arc part forming a circle center P4 with the same diameter, and the value ranges: 5.2mm

[0012] Preferably, the circle center P3 and the circle center P4 form a line L2 with the range: 4mm

[0013] Preferably, the angle between the L1 and the d-axis of the rotor body is α, and the range is: 38°

[0014] Preferably, the angle between the L2 and the d-axis of the rotor body is β, and the range is: 38°

[0015] Preferably, the outer wall of the magnetic steel is clamped and connected with the inner wall of the magnetic steel slot.

[0016] The magnetic steel and the inside of the rotor body are provided with a mounting air gap with a distance of 0-0.6mm.

[0017] Preferably, the inner wall of the d-axis magnetic separation hole is fixed with a connecting bridge.

[0018] Preferably, the rotor body includes a screw hole and a shaft hole, the shaft hole is located at the center of the rotor body, and the screw hole is located around the shaft hole.

[0019] Preferably, a permanent magnet synchronous motor includes the rotor described in any one of the above.

[0020] Preferably, a compressor includes the permanent magnet synchronous motor described above.

[0021] Beneficial effects: after adopting the structure of the application, the mutual cooperation of the q-axis magnetic separation hole and the d-axis magnetic separation hole and the cooperation of the first magnetic separation structure and the second magnetic separation structure can better change the magnetic circuit track, reduce the cogging torque, reduce the torque ripple, and reduce the speed fluctuation; thereby, the positioning accuracy of motor control can be improved, the starting difficulty can be reduced, the low-speed control effect can be improved, and the motor vibration and noise caused by torque ripple can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure of a rotor according to the present invention.

[0023] Figure 2 This is a partially enlarged schematic diagram of a rotor according to the present invention.

[0024] Figure 3 This is a partially enlarged schematic diagram of a rotor according to the present invention.

[0025] Figure 4 This is an enlarged structural schematic diagram of one embodiment of the rotor connection bridge described in this invention.

[0026] Figure 5 This is a schematic diagram of another possible structure of the rotor connecting bridge described in this invention.

[0027] Figure 6 This is a schematic diagram of another type of rotor connection bridge according to the present invention.

[0028] Figure 7 This is a schematic diagram comparing the output torque and torque pulsation of the refrigerator under operating conditions between existing solutions and the solutions of this invention.

[0029] Figures 1-7 1-Rotor body; 2-First magnetic isolation structure; 3-Second magnetic isolation structure; 4-Q-axis magnetic isolation hole; 5-Magnetic slot; 6-D-axis magnetic isolation hole; 7-Installation air gap; 8-Screw hole; 9-Shaft hole; 10-First main arc section; 11-First straight section; 12-First auxiliary arc section; 13-Second main arc section; 14-Second straight section; 15-Second auxiliary arc section; 16-Connecting bridge; 17-Magnet. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the embodiments do not limit the present invention in any way.

[0031] Example 1:

[0032] Example 1:

[0033] like Figures 1-3 The permanent magnet synchronous motor shown includes a rotor body 1, on which a magnet slot 5 and two q-axis magnetic isolation holes 4 are provided. The q-axis magnetic isolation holes 4 are located at the left and right ends of the magnet slot 5. The rotor body 1 is also provided with a d-axis magnetic isolation hole 6, and the bottom of the d-axis magnetic isolation hole 6 is connected to the top of the q-axis magnetic isolation hole 4. The left and right ends of the d-axis magnetic isolation hole 6 are provided with a first magnetic isolation structure 2 and a second magnetic isolation structure 3.

[0034] In the embodiment, the mutual cooperation of the q-axis and d-axis magnetic isolation holes and the cooperation of the first and second magnetic isolation structures can better change the magnetic path trajectory, reduce the cogging torque, reduce the torque ripple, and reduce the speed fluctuation; further, in the case of ensuring that the output torque reduction is limited, the positioning accuracy of motor control can be improved, the starting difficulty can be reduced, the low-speed control effect can be improved, and the motor vibration and noise caused by torque ripple can be effectively reduced.

[0035] In the embodiment, the other structures are the same as those of the above-mentioned embodiments, and the difference is that, as shown in the figure, Figures 1-3 The first magnetic isolation structure 2 includes a first main arc part 10, a first straight part 11, and a first auxiliary arc part 12. The first main arc part 10 is located on one side of the inner top of the d-axis magnetic isolation hole 6 and communicates with the outer circle of the rotor body 1. One end of the first straight part 11 is connected to one end of the first main arc part 10. The other end of the first straight part 11 is connected to one end of the first auxiliary arc part 12. The other end of the first auxiliary arc part 12 communicates with the q-axis magnetic isolation hole 4. The first main arc part changes the magnetic path once, the first straight part changes the magnetic path secondly, and the first auxiliary arc part changes the magnetic path again, which can reduce the output torque amplitude while reducing the cogging torque and torque ripple.

[0036] Specifically, the second magnetic isolation structure 3 includes a second main arc part 13, a second straight part 14, and a second auxiliary arc part 15. The second main arc part 13 is located on the other side of the inner top of the d-axis magnetic isolation hole 6 and communicates with the outer circle of the rotor body 1. One end of the second straight part 14 communicates with one end of the second main arc part 13. The other end of the second straight part 14 is connected to one end of the second auxiliary arc part 15. The other end of the second auxiliary arc part 15 communicates with the q-axis magnetic isolation hole 4. The second main arc part changes the magnetic path once, the second straight part changes the magnetic path secondly, and the second auxiliary arc part changes the magnetic path again, which can better reduce the output torque amplitude while reducing the cogging torque and torque ripple.

[0037] Specifically, the diameter of the center P1 of the first auxiliary arc part 12 and the center P2 of the second main arc part 13 is the same, and the value range is 5.2mm < R1 < 6.1mm. The second straight part 14 is tangent to the imaginary circle with the center P2 of the second main arc part 13 and the imaginary circle with the center P1 of the first auxiliary arc part 12, respectively.

[0038] The diameter of the circle center P3 formed by the first main arc part 10 is the same as the diameter of the circle center P4 formed by the second auxiliary arc part 15, and the value ranges from 5.2mm to 6.1mm, the first straight part 12 is tangent to the imaginary circle with the circle center P4 formed by the second auxiliary arc part 15 and the imaginary circle with the circle center P3 formed by the first main arc part 10, and the mutual cooperation of the first main arc part and the second auxiliary arc part and the first auxiliary arc part and the second main arc part of a certain specification can ensure the smoothness of the change of the magnetic circuit and better reduce the cogging torque and torque ripple.

[0039] Specifically, the line formed by the circle center P2 and the circle center P1 is L1, and the range of L1 is 4mm to 4.5mm;

[0040] The line formed by the circle center P3 and the circle center P4 is L2, and the range of L2 is 4mm to 4.5mm; the installation position of the first auxiliary arc part, the second main arc part, the first main arc part and the second auxiliary arc part can further ensure the stability and smoothness of the change of the magnetic circuit, and better reduce the cogging torque and torque ripple.

[0041] Specifically, the included angle α between L1 and the d-axis of the rotor body 1 ranges from 38° to 46°;

[0042] The included angle β between L2 and the d-axis of the rotor body 1 ranges from 38° to 46°, and the reasonable included angle between L1, L2 and the d-axis can further ensure the stability and smoothness of the change of the magnetic circuit, and better reduce the cogging torque and torque ripple.

[0043] The other structures in the embodiment are the same as those in the above-mentioned embodiments, and the difference is that, as shown in the figure, Figures 1-3 The inner wall of the magnetic steel slot 5 is clamped and connected with the outer wall of the magnetic steel 17;

[0044] Specifically, the magnetic steel 17 is provided with an installation air gap 7 between the inside of the rotor body 1, and the distance of the installation air gap 7 is 0-0.6mm, and the magnetic steel with a certain suitable installation position can make the change of the magnetic circuit reach the best effect;

[0045] The other structures in the embodiment are the same as those in the above-mentioned embodiments, and the difference is that, as shown in the figure, Figures 4-6 The inner wall of the d-axis magnetic isolation hole 6 is fixedly connected with the connecting bridge 16;

[0046] Specifically, the connecting bridge 16 is located between the first main arc part 10 and the second main arc part 13, or between the first straight part 11 and the second straight part 14, or between the first auxiliary arc part 12 and the second auxiliary arc part 14;

[0047] The other structure in the embodiment is the same as the above-mentioned embodiments, and is different in that, as shown in the figure, the rotor body 1 comprises screw holes 8 and an axle hole 9, the axle hole 9 is located at the center part of the rotor body 1, and the screw holes 8 are located around the axle hole 9. Figures 1-3

[0048] In the embodiment, a permanent magnet synchronous motor comprises the rotor of any one of the above-mentioned embodiments.

[0049] In the embodiment, a compressor comprises the permanent magnet synchronous motor of the above-mentioned embodiments.

[0050] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the terms "first", "second" are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0053] ​Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A rotor, characterized in that, The rotor body includes at least one magnet slot and at least one q-axis magnetic isolation hole, the q-axis magnetic isolation hole being located at the left and / or right end of the magnet slot; the rotor body also includes a d-axis magnetic isolation hole, the d-axis magnetic isolation hole being connected to the q-axis magnetic isolation hole, and the left and right ends of the d-axis magnetic isolation hole being provided with a first magnetic isolation substructure and a second magnetic isolation substructure; the first magnetic isolation substructure includes a first main arc portion, a first straight portion and a first auxiliary arc portion, the first main arc portion being located on one side of the inner top of the d-axis magnetic isolation hole and communicating with the outer circle of the rotor body, one end of the first straight portion being connected to one end of the first main arc portion, the other end of the first straight portion being connected to one end of the first auxiliary arc portion, and the other end of the first auxiliary arc portion being connected to the q-axis magnetic isolation hole.

2. A rotor according to claim 1, characterized in that, The second magnetic isolation structure includes a second main arc section, a second straight section, and a second auxiliary arc section. The second main arc section is located on the other side of the inner top of the d-axis magnetic isolation hole and communicates with the outer circle of the rotor body. One end of the second straight section is connected to one end of the second main arc section, the other end of the second straight section is connected to one end of the second auxiliary arc section, and the other end of the second auxiliary arc section is connected to the q-axis magnetic isolation hole.

3. A rotor according to claim 1, characterized in that, The diameter of the center P1 formed by the first auxiliary arc and the diameter of the center P2 formed by the second main arc are the same, with a value ranging from 5.2 mm. <R1<6.1mm。 4. A rotor according to claim 3, characterized in that, The line L1 formed by the center P2 and the center P1 has a range of 4mm. <L1<4.5mm。 5. A rotor according to claim 1, characterized in that, The diameter of the center P3 formed by the first main arc and the diameter of the center P4 formed by the second auxiliary arc are the same, with a value ranging from 5.2 mm. <R2<6.1mm。 6. A rotor according to claim 5, characterized in that, The line connecting the center P3 and the center P4 forms a line with a range of 4mm. <L2<4.5mm。 7. A rotor according to claim 4, characterized in that, The range of the angle α between L1 and the d-axis of the rotor body is: 38° < α < 46° 8. A rotor according to claim 6, characterized in that, The range of the included angle β between L2 and the d-axis of the rotor body is: 38° < β < 46°.

9. A rotor according to claim 1, characterized in that, The outer wall of the magnet is tightly connected to the inner wall of the magnet groove; An air gap is provided between the magnet and the inside of the rotor body, and the distance of the air gap is 0-0.6mm.

10. A rotor according to claim 1, characterized in that, A connecting bridge is fixed to the inner wall of the d-axis magnetic isolation hole.

11. A rotor according to claim 1, characterized in that, The rotor body includes screw holes and shaft holes, with the shaft holes located at the center of the rotor body and the screw holes located around the shaft holes.

12. A permanent magnet synchronous motor, characterized in that, The rotor includes any one of claims 1-11.

13. A compressor, characterized in that, Including the permanent magnet synchronous motor as described in claim 12 above.

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