Alternating pole motor and compressor having the same

Abstract

The present invention provides an alternating pole motor and a compressor having the same. The alternating pole motor comprises a rotor, the rotor comprises a plurality of sub-rotors, and the plurality of sub-rotors are connected along the axis direction of the rotor, and the rotor further comprises a baffle, and the baffle is arranged between two adjacent sub-rotors. The present invention effectively solves the problem of relatively serious magnetic leakage in the alternating pole motor in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an alternating-pole motor and a compressor having the same. Background Art

[0002] The traditional 8-pole permanent magnet motor has 8 permanent magnets, and the 8 permanent magnets are arranged around the center of the rotor core. Adjacent permanent magnets have different magnetization directions, so the magnetic lines of force emitted from the N pole of a permanent magnet pass through the stator core and reach the S pole of the adjacent permanent magnet. A magnetic line of force passes through at least two permanent magnets in the loop. Therefore, the working point of the permanent magnet is high, the permanent magnet is not fully utilized, and the cost of the motor is increased.

[0003] In the prior art, in order to solve the above problems, a segmented alternating pole permanent magnet motor has emerged, in which multiple rotor segments are axially connected together. Specifically, taking an 8-pole motor as an example, there are only 4 permanent magnet poles on it, and adjacent permanent magnets have the same magnetization direction. The one with permanent magnet mounting slots is called a permanent magnet pole, and the soft magnetic material between the two permanent magnet mounting slots is magnetized by the permanent magnet pole into a polarity opposite to that of the permanent magnet pole.

[0004] However, the permanent magnet end of the segmented alternating pole motor is in direct contact with the rotor core of another rotor section, the magnetic resistance of the leakage magnetic path is very small, and the end leakage magnetic flux increases sharply, thereby reducing the output torque of the motor and reducing the operating efficiency of the motor. Summary of the invention

[0005] The main purpose of the present invention is to provide an alternating-pole motor and a compressor having the same, so as to solve the problem of serious magnetic leakage in the alternating-pole motor in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an alternating-pole motor is provided, which includes a rotor, the rotor includes a plurality of sub-rotors, and the plurality of sub-rotors are connected along the axial direction of the rotor, and the rotor also includes a barrier portion, which is arranged between two adjacent sub-rotors.

[0007] Furthermore, the barrier portion is a plate-shaped structure.

[0008] Furthermore, each sub-rotor includes a rotor core and a permanent magnet disposed in a mounting groove of the rotor core, and the ratio of the thickness t1 of the permanent magnet to the thickness t3 of the plate-like structure satisfies

[0009] Furthermore, each sub-rotor includes a rotor core and a permanent magnet disposed in a mounting groove of the rotor core, a ventilation groove is disposed along the axial direction of the rotor core, and the baffle has a through hole connected to the ventilation groove.

[0010] Furthermore, the ventilation groove is an annular groove or a segment of arc groove or multiple segments of arc grooves coaxially arranged with the rotor core.

[0011] Furthermore, when the vent groove is an arc groove, there is a distance t2 between the first end of the arc groove and the second end of the arc groove, and the ratio of the groove width w2 of the arc groove to the distance t2 satisfies:

[0012] Furthermore, when the ventilation groove is a multi-section arc groove, there is a distance t3 between two adjacent arc grooves, and the ratio of the groove width w2 of the arc groove to the distance t3 satisfies:

[0013] Furthermore, the rotor core has a through hole for the shaft to pass through, a distance w1 is provided between the slot wall of the ventilation slot near the through hole and the hole wall of the through hole, a distance w3 is provided between the slot wall of the ventilation slot near the permanent magnet and the permanent magnet, and 3w3≤2w2≤w1 is satisfied.

[0014] Further, the portion between any two adjacent arc-shaped slots is a bridge portion, and the bridge portion is arranged to be inclined relative to the axial plane of the rotor core passing through the bridge portion.

[0015] Furthermore, the ventilation groove is a polygonal groove or a one-segment L-shaped groove or a multi-segment L-shaped groove.

[0016] Furthermore, the ventilation grooves are multi-segmented, and the ventilation grooves are symmetrically arranged along the central axis of the rotor core.

[0017] Furthermore, the rotor also includes a non-magnetic conductive structure, and the non-magnetic conductive structure is filled in a part of or the whole area of ​​the ventilation groove.

[0018] Further, the non-magnetic conductive structure is made of resin.

[0019] Further, the outer surface of the baffle is aligned with the outer surface of the rotor core.

[0020] Furthermore, the rotor also includes two end covers, which are respectively arranged at both ends of the rotor core. The fastener passes through one end cover, a section of the rotor, the baffle and another section of the rotor in sequence and is then fixed to the other end cover.

[0021] Furthermore, the baffle and / or the end cover are made of a non-magnetic metal material.

[0022] According to another aspect of the present invention, a compressor is provided, comprising the above-mentioned alternating-pole motor.

[0023] By applying the technical solution of the present invention, the alternating pole motor includes a rotor, the rotor includes a multi-segment rotor, and the multi-segment rotor is connected along the axial direction of the rotor, and the rotor also includes a baffle, which is arranged between two adjacent sub-rotors. In this way, during the operation of the alternating pole motor, the baffle can increase the magnetic resistance of the leakage magnetic circuit between the multi-segment rotors, thereby reducing the degree of magnetic leakage between the two adjacent sub-rotors, reducing the degree of magnetic leakage of the rotor, and finally reducing the degree of magnetic leakage of the alternating pole motor, thereby increasing the output torque of the alternating pole motor and improving the working performance of the alternating pole motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A schematic diagram of the exploded structure of the rotor of the first embodiment of the alternating-pole motor according to the present invention is shown;

[0026] Figure 2 Shows Figure 1 A top view of a section of a rotor of the rotor;

[0027] Figure 3 Shows Figure 1 A top view of another section of the rotor in the rotor;

[0028] Figure 4 Shows Figure 1 A top view of the baffle portion of the rotor in FIG.

[0029] Figure 5 Shows Figure 1 A top view of the end cover of the rotor in FIG.

[0030] Figure 6 A top view of a sub-rotor of a second embodiment of an alternating-pole motor according to the present invention is shown;

[0031] Figure 7 A top view of another rotor segment of the second embodiment of the alternating-pole motor according to the present invention is shown;

[0032] Figure 8 A top view of a sub-rotor of a third embodiment of an alternating-pole motor according to the present invention is shown;

[0033] Fig. 9 A top view of a section of a rotor of a fifth embodiment of an alternating-pole motor according to the present invention is shown;

[0034] Fig.10 A comparison diagram of radial electromagnetic excitation force between the alternating-pole motor in the present application and the alternating-pole motor in the prior art is shown;

[0035] Fig.11 A comparison diagram of an alternating-pole motor in the present application, a rotor without segmentation, and a segmented rotor without a baffle in the middle is shown;

[0036] Fig.12 A cross-sectional view of magnetic flux leakage of a segmented rotor in the prior art is shown.

[0037] The above drawings include the following reference numerals:

[0038] 10. Sub-rotor; 11. Rotor core; 111. Mounting groove; 112. Ventilation groove; 113. Through hole; 114. Bridging part; 115. Yoke; 12. Permanent magnet; 20. Blocking part; 21. Central hole; 30. End cover; 31. End cover groove; 32. End cover hole; 33. End cover bridging part. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0041] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0042] In order to solve the problem of serious magnetic leakage in the alternating-pole motor in the prior art, the present application provides an alternating-pole motor and a compressor having the same.

[0043] Embodiment 1

[0044] like Figures 1 to 3 As shown, the alternating-pole motor includes a rotor, which includes a plurality of sub-rotors 10 connected along the axis of the rotor. The rotor also includes a baffle 20 disposed between two adjacent sub-rotors 10 .

[0045] By applying the technical solution of this embodiment, during the operation of the alternating-pole motor, the blocking portion 20 can increase the magnetic resistance of the leakage magnetic circuit between the multi-segment rotors 10, thereby reducing the degree of leakage magnetic field between two adjacent sub-segment rotors 10, reducing the degree of leakage magnetic field of the rotor, and ultimately reducing the degree of leakage magnetic field of the alternating-pole motor, thereby increasing the output torque of the alternating-pole motor and improving the working performance of the alternating-pole motor.

[0046] like Figure 1 and Figure 4 As shown, the barrier 20 is a plate-shaped structure. In this way, the barrier 20 with a plate-shaped structure can reduce the distance between adjacent sub-rotors 10, relatively increase the magnetic flux of the rotor, and increase the inter-segment magnetic resistance between two adjacent sub-rotors 10. The above structure makes the barrier 20 simple in structure and easy to process, thereby reducing the processing cost of the alternating pole motor.

[0047] like Figure 2 and Figure 3 As shown, each sub-rotor 10 includes a rotor core 11 and a permanent magnet 12 disposed in a mounting groove 111 of the rotor core 11. The ratio of the thickness t1 of the permanent magnet 12 to the thickness t3 of the plate structure satisfies Specifically, If the ratio is too small, it will not limit the axial magnetic leakage of the alternating-pole motor; When the ratio is too large, the effective length of the rotor core 11 will be shortened, resulting in a smaller magnetic flux of the rotor core. In this way, the above value range can effectively improve the air gap flux density of the alternating pole motor, increase the output power of the alternating pole motor, and reduce the loss of the alternating pole motor.

[0048] In this embodiment, the blocking portion 20 has a central hole 21 for the shaft to pass through. Thus, the above arrangement makes the structure of the alternating-pole motor more compact and simple.

[0049] like Figure 4 As shown, each sub-rotor 10 includes a rotor core 11 and a permanent magnet 12 disposed in a mounting groove 111 of the rotor core 11, a ventilation groove 112 is disposed along the axial direction of the rotor core 11, and the blocking portion 20 has a through hole connected to the ventilation groove 112. The permanent magnet 12 and the part of the rotor core 11 located outside the mounting groove 111 have the same magnetic pole, and the part of the rotor core 11 is called a permanent magnetic pole.

[0050] like Fig.12 As shown in the figure, generally, due to the segmented assembly of the rotor, two parts of leakage flux are generated:

[0051] The first part of the leakage flux B1 is the end leakage flux of the permanent magnet 12. Although the conventional alternating pole motor also has end leakage flux B3, the leakage flux is very small because there is only air in its leakage flux path. However, the end of the permanent magnet 12 of the segmented alternating pole motor is in direct contact with the rotor core 11 of the other segment rotor 10, the magnetic resistance of the leakage flux path is very small, and the end leakage flux increases sharply;

[0052] The second part of the leakage magnetic flux B1 passes through the permanent magnet 12 of the upper rotor 10, the upper rotor yoke, the shaft, the lower rotor yoke, the permanent magnet 12 of the lower rotor 10, and then enters the air gap and the stator to form a loop.

[0053] Specifically, for the first part of the leakage magnetic field B1 mentioned above, the motor of this embodiment is provided with a baffle 20 between the two sections of the sub-rotor 10 to increase the magnetic resistance of the leakage magnetic circuit, which has achieved good results. The radial outer surface of the baffle 20 has a shape that matches the outer surface of the sub-rotor 10, and the outer contour is surrounded by the outer contour of the rotor core 11, ensuring that there is no interference with the stator core when the rotor rotates. A central hole 21 is provided in the center of the baffle 20. In order to obtain a sufficiently large refrigerant flow area, the coverage area of ​​the central hole 21 should include the ventilation groove 112 on the rotor core 11. The part other than the central hole 21 partially or completely covers the mounting groove of the permanent magnet 12 to prevent the permanent magnet 12 from axial movement.

[0054] For the second part of the leakage magnetic flux B2, a ventilation groove 112 extending along the circumference of the sub-rotor 10 is provided on the yoke of the sub-rotor 10 to guide the magnetic lines of force emitted by the permanent magnet 12 to enter the air gap between the rotor and the stator from the alternating poles, thereby reducing the axial leakage magnetic flux.

[0055] Optionally, the ventilation groove 112 is provided on the yoke 115 of the rotor core 11 .

[0056] Optionally, the sub-rotor 10 is formed by stamping. The above processing method is relatively simple and easy, thereby reducing the labor intensity of the staff.

[0057] Specifically, the mounting slot 111 is a straight slot, and the permanent magnet 12 matches the shape of the mounting slot 111. Thus, the above arrangement enables the number of rotor poles of the alternating pole motor to be 4 poles, 6 poles, 8 poles, etc., thereby enabling the alternating pole motor to adapt to different working conditions.

[0058] Optionally, there are multiple installation slots 111, and the multiple installation slots 111 are symmetrically arranged around the central axis of the rotor core 11, and there are multiple permanent magnets 12 arranged one-to-one corresponding to the multiple installation slots 111. Figure 2 and Figure 3As shown, in this embodiment, there are two mounting grooves 111, and the two mounting grooves 111 are symmetrically arranged around the central axis of the rotor core 11, and there are two permanent magnets 12 arranged one-to-one corresponding to the plurality of mounting grooves 111. Thus, the above arrangement enables the rotor pole number of the alternating pole motor to be 4 poles.

[0059] In this embodiment, the rotor of the alternating-pole motor includes two rotor segments 10, and a barrier portion 20 is provided between the two rotor segments 10. The two permanent magnets 12 in the same rotor segment 10 have the same magnetizing direction, and the permanent magnets 12 in two different rotor segments 10 have opposite magnetizing directions. The permanent magnets 12 on the two rotor segments 10 are offset by half an electrical cycle / 180 electrical degrees along the circumferential direction of the rotor core 11.

[0060] Specifically, in the upper rotor 10, the permanent magnet 12 magnetizes the portion of the rotor core 11 located outside the mounting slot 111 to an N pole, and the portion of the rotor core 11 located inside the mounting slot 111 is an S pole. In the lower rotor 10, the permanent magnet 12 magnetizes the portion of the rotor core 11 located outside the mounting slot 111 to an S pole, and the portion of the rotor core 11 located inside the mounting slot 111 is an N pole. Afterwards, the two rotors 10 are connected together, and it is ensured that the like poles are located in the same axial direction. In this way, the above arrangement allows the magnetic flux generated by the permanent magnet N pole of the upper rotor 10 to be superimposed on the alternating pole N pole magnetic flux of the lower rotor 10, ensuring that each N pole face or S pole face in the circumferential direction of the alternating pole motor has the same magnetic flux, ensuring the symmetry of adjacent poles, eliminating abnormal radial electromagnetic excitation force, and weakening the vibration and noise generated thereby.

[0061] like Figure 2 and Figure 3 As shown, the ventilation groove 112 is an arc-shaped groove coaxially arranged with the rotor core 11. The above structure is simple in structure and easy to process, and allows the magnetic lines of force emitted from the permanent magnet 12 to enter the stator of the motor from the alternating poles more, so as to reduce the axial magnetic leakage of the alternating pole motor and improve the output torque of the alternating pole motor. At the same time, the above arrangement can ensure that the ventilation groove 112 has the minimum effect on the magnetic resistance of the main magnetic circuit.

[0062] In other embodiments not shown in the drawings, the ventilation groove is an annular groove coaxially arranged with the rotor core. The two parts of the rotor core separated by the annular groove are connected together by a connecting structure. In this way, the above arrangement allows more magnetic lines of force emitted from the permanent magnet to enter the stator of the alternating pole motor from the alternating poles, thereby improving the working efficiency of the alternating pole motor.

[0063] like Figure 2 and Figure 3 As shown, there is a distance t2 between the first end and the second end of the arc groove, and the ratio of the groove width w2 of the arc groove to the distance t2 satisfies In this way, the above setting will make the rotor core 11 have better mechanical strength, thereby improving its structural strength and extending the service life of the alternating pole motor. At the same time, the above value range can effectively reduce the axial magnetic leakage of the alternating pole motor, improve the working performance of the alternating pole motor, and reduce energy loss.

[0064] like Figure 2 and Figure 3 As shown, the rotor core 11 has a through hole 113 for the shaft to pass through, the slot wall of the ventilation slot 112 close to the through hole 113 has a distance w1 from the hole wall of the through hole 113, the slot wall of the ventilation slot 112 close to the permanent magnet 12 has a distance w3 from the permanent magnet 12, and 3w3≤2w2≤w1 is satisfied. In this way, during the rotation of the alternating-pole motor, the above parameter range can ensure the mechanical strength of the rotor core 11, prevent the rotor core 11 from being damaged and affecting the normal operation of the alternating-pole motor, and extend the service life of the alternating-pole motor.

[0065] like Figure 2 and Figure 3 As shown, the portion between the first end and the second end of the arc-shaped slot is a bridge portion 114, and the bridge portion 114 is arranged at a position close to the permanent magnetic pole, and the bridge portion 114 is arranged along the radial direction of the rotor core 11. In this way, the bridge portion 114 arranged at a position close to the permanent magnetic pole has a better anti-magnetic leakage effect than that arranged at the position of the alternating pole, thereby improving the output torque of the alternating pole motor.

[0066] In this embodiment, the rotor of the alternating-pole motor further includes a non-magnetic conductive structure, which is filled in a part or the entire area of ​​the ventilation slot 112. Thus, the above arrangement can greatly enhance the structural strength of the alternating-pole motor and extend the service life of the alternating-pole motor.

[0067] Optionally, the non-magnetic conductive structure is resin. Resin is a common material and has good magnetic insulation, thereby reducing the processing cost of the alternating pole motor.

[0068] like Figure 1 As shown, the outer surface of the baffle 20 is aligned with the outer surface of the rotor core 11. In this way, the outer surface of the baffle 20 has a shape that matches the outer surface of the rotor core 11, ensuring that the rotor will not have structural or motion interference with the stator core during rotation. Specifically, the baffle 20 is installed between the two rotor sections 10, and the strength requirement is very low. The outer surface of the baffle 20 is formed by splicing arcs, and each magnetic pole is a segment of arc. The arcs are connected with rounded corners or right angles, which has little effect on the strength of the baffle 20. The above structure is simple in structure and easy to process and implement.

[0069] It should be noted that the size relationship between the outer surface of the baffle 20 and the outer surface of the rotor core 11 is not limited thereto. Optionally, the outer surface of the rotor core 11 protrudes from the outer surface of the baffle 20 .

[0070] like Figure 1 and Figure 5 As shown, the rotor further includes two end covers 30, which are respectively arranged at the two ends of the rotor core 11. The fasteners pass through one end cover 30, a section of the rotor 10, the baffle 20 and another section of the rotor 10 in sequence and are fixed to the other end cover 30. Specifically, the end cover 30 mainly plays the role of axially pressing the rotor core 11, and the outer surface of the end cover 30 has a shape that matches the outer surface of the rotor core 11. The outer surface of the end cover 30 is spliced ​​by arcs, and each magnetic pole is a section of arc. In order to ensure the structural strength of the end cover 30, the arcs are connected by arcs.

[0071] Specifically, in order to ensure sufficient flow area, an end cover slot 31 and an end cover hole 32 are provided in the middle of the end cover 30, the orthographic projection of the venting slot 112 on the end cover slot 31 is located in the end cover slot 31, and an end cover bridge portion 33 is provided at the magnetic pole center line position of the permanent magnetic pole and the alternating pole. In this way, the end cover bridge portion 33 ensures that the end cover 30 has sufficient mechanical strength to press the rotor core 11. Among them, the orthographic projection of the central hole 21 of the baffle 20 on the end cover hole 32 is located in the end cover hole 32.

[0072] Optionally, the number of the end cover bridge portions 33 is greater than the number of the bridge portions 114 on the rotor core 11 , thereby ensuring the structural strength of the end cover bridge portions 33 and preventing the end cover 30 from being damaged.

[0073] In this embodiment, the barrier 20 and the end cover 30 are made of non-magnetic metal materials. Thus, the above arrangement prevents the magnetic field lines from passing through the barrier 20 and the end cover 30, thereby improving the anti-magnetic leakage effect of the above structure.

[0074] The present application also provides a motor, including the above-mentioned alternating-pole motor. The motor includes a stator, and the stator includes a stator core and a stator winding, and the stator winding is wound on the stator core. Among them, the stator core is made of laminated sheets of soft magnetic material. In this way, during the operation of the motor, the rotor rotates relative to the stator, and the barrier 20 prevents the alternating-pole motor from leaking magnetic flux, thereby improving the working performance of the motor. Specifically, the abnormal electromagnetic force of the motor using the technical solution of this embodiment is well eliminated, and by providing the ventilation groove 112 and the barrier 20, the loss of magnetic lines of force is minimized, the air gap magnetic density of the alternating-pole motor is maximized, the electromagnetic torque of the alternating-pole motor is increased, and the working performance of the alternating-pole motor is improved.

[0075] Specifically, the modulus of the abnormal electromagnetic force is related to the frequency and the matching of the poles and slots. Fig.10 In this embodiment, a 9S6P structure is adopted, and the frequency of abnormal electromagnetic force is 9 times and 27 times. The radial electromagnetic excitation force of the motor using the technical solution in this embodiment is much smaller than that of the motor in the prior art, thereby reducing the vibration and noise of the motor and improving the user experience.

[0076] like Fig.11 As shown, S1 in the figure represents the curve of the electromagnetic torque of the motor (i.e., the conventional alternating pole motor) changing with the current when the rotor of the alternating pole motor is not segmented, S2 represents the curve of the electromagnetic torque of the alternating pole motor of the present application changing with the current, and S3 represents the curve of the electromagnetic torque of the alternating pole motor changing with the current when the segmented rotor is not provided with a baffle and the venting grooves 112 on the rotor punching. It can be seen from the figure that compared with the alternating pole motor when the segmented rotor is not provided with a baffle, the alternating pole motor in this embodiment can increase the electromagnetic torque, thereby improving the output efficiency of the alternating pole motor.

[0077] Embodiment 2

[0078] The alternating-pole motor in the second embodiment differs from that in the first embodiment in that the structure of the ventilation slot 112 is different.

[0079] Optionally, the ventilation groove 112 is a multi-section arc groove coaxially arranged with the rotor core 11. Figure 6 and Figure 7 As shown, the ventilation groove 112 is two arc-shaped grooves coaxially arranged with the rotor core 11. The above structure is simple in structure and easy to process, and allows more magnetic lines of force emitted from the permanent magnet 12 to enter the ventilation groove 112 from the alternating poles, thereby reducing the axial magnetic leakage of the alternating pole motor and improving the output torque of the alternating pole motor.

[0080] like Figure 6 and Figure 7 As shown, there is a distance t3 between the two arc-shaped grooves, and the ratio of the arc-shaped groove width w2 to the distance t3 satisfies In this way, the above setting will make the rotor core 11 have better mechanical strength, thereby improving its structural strength and extending the service life of the alternating pole motor. At the same time, the above value range can effectively reduce the axial magnetic leakage of the alternating pole motor, improve the working performance of the alternating pole motor, and reduce energy loss.

[0081] like Figure 6 and Figure 7 As shown, the portion between the two arc-shaped slots is a bridge portion 114, and the bridge portion 114 is arranged along the radial direction of the rotor core 11. The above arrangement can improve the structural strength of the rotor core 11 and extend the service life of the rotor core 11.

[0082] like Figure 6 and Figure 7As shown, the ventilation grooves 112 are symmetrically arranged along the central axis of the rotor core 11. Specifically, the ventilation grooves 112 are symmetrically arranged about the center line of the magnetic pole (d axis) and the center line of the adjacent magnetic pole (q axis), so that the shapes of the two ventilation grooves 112 staggered on the two-stage rotor 10 are consistent, so as to obtain the maximum flow area and improve the heat exchange performance of the alternating pole motor.

[0083] Embodiment 3

[0084] The alternating-pole motor in the third embodiment is different from that in the second embodiment in that the structure of the bridge portion 114 is different.

[0085] like Figure 8 As shown, the portion between the first end and the second end of the arc-shaped slot is a bridge portion 114, and the bridge portion 114 is arranged obliquely relative to the axial plane of the rotor core 11 passing through the bridge portion 114. In this way, the above arrangement can make the length of the bridge portion 114 larger, thereby further improving the anti-magnetic leakage effect.

[0086] Embodiment 4

[0087] The alternating-pole motor in the fourth embodiment differs from that in the first embodiment in that the structure of the ventilation slot 112 is different.

[0088] In this embodiment, the ventilation groove is a polygonal groove. The above structure is simple and easy to process, and allows more magnetic lines of force emitted from the permanent magnet to enter the ventilation groove from the alternating poles, thereby reducing the axial magnetic leakage of the alternating pole motor and improving the output torque of the alternating pole motor. At the same time, the above arrangement can ensure that the ventilation groove has the least effect on the magnetic resistance of the main magnetic circuit.

[0089] Embodiment 5

[0090] The alternating-pole motor in the fifth embodiment differs from that in the fourth embodiment in that the structure of the ventilation slot 112 is different.

[0091] Optionally, the ventilation groove 112 is a multi-stage L-shaped groove, and the multi-stage ventilation groove 112 is symmetrically arranged along the central axis of the rotor core 11. Fig. 9 As shown, the ventilation groove 112 is an L-shaped groove with two sections of the rotor core 11. The above structure is simple in structure and easy to process, and allows more magnetic lines of force emitted from the permanent magnet 12 to enter the stator of the motor from the alternating poles, thereby reducing the axial magnetic leakage of the alternating pole motor and improving the output torque of the alternating pole motor.

[0092] Specifically, the ventilation grooves 112 are symmetrically arranged about the center line of the magnetic pole (d-axis) and the center line of the adjacent magnetic pole (q-axis), so that the shapes of the two ventilation grooves 112 staggered on the two-stage rotor 10 are consistent, so as to obtain the maximum flow area and improve the heat exchange performance of the alternating-pole motor.

[0093] In other embodiments not shown in the drawings, the ventilation groove is a section of an L-shaped groove.

[0094] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0095] During the operation of the alternating-pole motor, the blocking part can increase the magnetic resistance of the leakage magnetic circuit between the multi-segment rotors, thereby reducing the leakage magnetic degree between two adjacent sub-rotors, reducing the leakage magnetic degree of the rotor, and finally reducing the leakage magnetic degree of the alternating-pole motor, thereby increasing the output torque of the alternating-pole motor and improving the working performance of the alternating-pole motor.

[0096] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0097] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0098] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An alternating pole motor, characterized in that: The alternating pole motor comprises a rotor, the rotor comprises a plurality of sub-rotors (10), and the plurality of sub-rotors (10) are connected along the axial direction of the rotor, the rotor further comprises a baffle (20), the baffle (20) is arranged between two adjacent sub-rotors (10); the baffle (20) is a plate-like structure; each sub-rotor (10) comprises a rotor core (11) and a permanent magnet (12) arranged in a mounting groove (111) of the rotor core (11), the ratio of the thickness t1 of the permanent magnet (12) to the thickness t3 of the plate-like structure satisfies: Each of the sub-rotors (10) comprises a rotor core (11) and a permanent magnet (12) arranged in a mounting groove (111) of the rotor core (11), and a ventilation groove (112) is arranged along the axial direction of the rotor core (11); the rotor further comprises two end covers (30), the two end covers (30) are respectively arranged at two ends of the rotor core (11), an end cover groove (31) and an end cover hole (32) are opened in the middle of the end cover (30), the orthographic projection of the ventilation groove (112) on the end cover groove (31) is located in the end cover groove (31), and end cover bridge portions (33) are respectively arranged at the magnetic pole center line positions of the permanent magnet pole and the alternating pole.

2. The alternating-pole motor according to claim 1, characterized in that: The baffle portion (20) has a through hole communicating with the ventilation groove (112).

3. The alternating-pole motor according to claim 2, characterized in that: The ventilation groove (112) is an annular groove or a segment of an arc groove or multiple segments of arc grooves coaxially arranged with the rotor core (11).

4. The alternating-pole motor according to claim 3, characterized in that: When the vent groove (112) is an arc-shaped groove, there is a distance t2 between the first end of the arc-shaped groove and the second end of the arc-shaped groove, and the ratio of the groove width w2 of the arc-shaped groove to the distance t2 satisfies:

5. The alternating-pole motor according to claim 3, characterized in that: When the ventilation groove (112) is a multi-section arc groove, there is a distance t4 between two adjacent arc grooves, and the ratio of the groove width w2 of the arc groove to the distance t4 satisfies:

6. The alternating-pole motor according to claim 5, characterized in that: The rotor core (11) has a through hole (113) for the shaft to pass through, a distance w1 is provided between the slot wall of the ventilation slot (112) close to the through hole (113) and the hole wall of the through hole (113), a distance w3 is provided between the slot wall of the ventilation slot (112) close to the permanent magnet (12) and the permanent magnet (12), and 3w3≤2w2≤w1 is satisfied.

7. The alternating-pole motor according to claim 5 or 6, characterized in that: The portion between any two adjacent arc-shaped slots is a bridge portion (114), and the bridge portion (114) is arranged to be inclined relative to an axial plane of the rotor core (11) passing through the bridge portion (114).

8. The alternating-pole motor according to claim 2, characterized in that: The ventilation groove (112) is a polygonal groove or a one-segment L-shaped groove or a multi-segment L-shaped groove.

9. The alternating-pole motor according to claim 2, characterized in that: The ventilation grooves (112) are multiple-stage, and the ventilation grooves (112) are symmetrically arranged along the central axis of the rotor core (11).

10. The alternating-pole motor according to claim 2, characterized in that: The rotor further comprises a non-magnetic conductive structure, wherein the non-magnetic conductive structure fills a part of or the entire area of ​​the ventilation groove (112).

11. The alternating-pole motor according to claim 10, characterized in that: The non-magnetic conductive structure is made of resin.

12. The alternating-pole motor according to claim 2, characterized in that: The outer surface of the baffle (20) is aligned with the outer surface of the rotor core (11).

13. The alternating-pole motor according to claim 2, characterized in that: The fastener passes through one end cover (30), a section of the sub-rotor (10), the baffle (20) and another section of the sub-rotor (10) in sequence and is then fixed to the other end cover (30).

14. The alternating-pole motor according to claim 13, characterized in that: The baffle (20) and / or the end cover (30) are made of a non-magnetic metal material.

15. A compressor, characterized in that: An alternating-pole motor comprising the one of claims 1 to 14.

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