A permanent magnet motor, a compressor and an air conditioner having the same

Abstract

The application discloses a kind of permanent magnet motor and compressor and air conditioner with it, permanent magnet motor includes rotor core and stator core, the rotor core is along its circumferential and is provided with a plurality of permanent magnet slots, a plurality of permanent magnets are one-to-one corresponding and installed in a plurality of the permanent magnet slots, on the rotor core radial section, at least one end in the opposite ends of the permanent magnet slot is communicated with first magnetic bridge hole.The first magnetic bridge hole is communicated with one end or two ends of the permanent magnet slot, the magnetic isolation capacity of permanent magnet synchronous motor is improved, the probability of magnetic leakage is reduced, and the working efficiency of permanent magnet motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a permanent magnet motor, a compressor and an air conditioner with the same. BACKGROUND

[0002] Permanent magnet synchronous motor refers to a kind of synchronous motor with permanent magnet instead of winding, which has the advantages of high power factor, constant speed, small size, light weight and high efficiency, and has wide application prospect. However, the existing permanent magnet synchronous motor is prone to magnetic leakage, which affects the working efficiency of the motor, and the structure of the permanent magnet motor needs to be further optimized. SUMMARY

[0003] The first object of the present application is to provide a permanent magnet motor to solve the problem of single stagnation of the existing permanent magnet motor.

[0004] To achieve the above object, the technical scheme provided by the present application is as follows: a permanent magnet motor, comprising a rotor core and a stator core, a plurality of permanent magnet grooves are formed in the rotor core along its circumferential direction, a plurality of permanent magnets are installed one by one in the plurality of permanent magnet grooves, and at least one end of the permanent magnet groove is communicated with a first magnetic isolation bridge hole in the radial cross section of the rotor core.

[0005] According to the permanent magnet motor provided by the present application, the first magnetic isolation bridge hole is communicated at one end or both ends of the permanent magnet groove, which improves the magnetic isolation capability of the permanent magnet synchronous motor, reduces the probability of magnetic leakage, and further improves the working efficiency of the permanent magnet motor.

[0006] In addition, the permanent magnet motor according to the above embodiment of the present application can also have the following additional technical features:

[0007] According to one example of the present application, a second magnetic isolation bridge hole is provided between the two adjacent permanent magnet grooves.

[0008] According to one example of the present application, the second magnetic isolation bridge hole is filled with a magnetic isolation fluid.

[0009] According to one example of the present application, the permanent magnet groove is V-shaped, and the permanent magnet is gap-fitted with the permanent magnet groove.

[0010] According to one example of the present application, the permanent magnet comprises a first permanent magnet piece and a second permanent magnet piece at an angle to each other, and the first permanent magnet piece and the second permanent magnet piece have an installation gap therebetween.

[0011] According to one example of the present application, the rotor core comprises a first core, a second core and a baffle, two second cores are respectively arranged at both ends of the first core, and two baffles are respectively installed on the outer sides of the two baffles.

[0012] According to one example of the present application, the mouse cage comprises a plurality of mouse cage bars and two mouse cage rings at both ends of the mouse cage bars, and the mouse cage rings are connected with the plurality of mouse cage bars respectively; the outer periphery of the first iron core is provided with a plurality of mouse cage grooves, and the plurality of mouse cage bars are installed in the plurality of mouse cage grooves one by one, and the two second iron cores are arranged in the two mouse cage rings respectively.

[0013] According to one example of the present application, the first iron core, the second iron core and the baffle are provided with at least one connecting hole, the connecting piece passes through the connecting hole and connects the first iron core, the second iron core and the baffle into one body; when the second magnetic bridge hole is arranged between the two adjacent permanent magnet grooves, the aperture of the second magnetic bridge hole close to the connecting hole is smaller than the aperture of the second magnetic bridge hole far from the connecting hole.

[0014] According to one example of the present application, the stator core is provided with an insulation groove, and the insulation groove is inserted with insulation paper.

[0015] According to one example of the present application, the outer wall of the stator core is provided with a plurality of stator flow-through grooves along the circumferential direction.

[0016] The second object of the present application is to provide a compressor with the permanent magnet motor as described in the above technical solution.

[0017] The third object of the present application is to provide an air conditioner with the compressor as described in the above technical solution.

[0018] The advantages of the above additional aspects will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an explosion view of the permanent magnet motor of the embodiment of the present application;

[0020] Figure 2 It is a structural schematic view of the permanent magnet motor of the embodiment of the present application;

[0021] Figure 3 It is a structural schematic view of the first iron core of the embodiment of the present application (one);

[0022] Figure 4 It is a structural schematic view of the first iron core of the embodiment of the present application (two);

[0023] Figure 5 It is an enlarged view of A part of the embodiment of the present application; Figure 3

[0024] Figure 6 It is a structural schematic view of the second iron core of the embodiment of the present application (one);​

[0025] Figure 7 Schematic diagram of the structure of the second core of the embodiment of the present invention (II);

[0026] Figure 8 Schematic diagram of the structure of the stator core of an embodiment of the present invention (1);

[0027] Figure 9 Schematic diagram of the structure of the stator core of an embodiment of the present invention (II);

[0028] Figure 10 Schematic diagram of the structure of the stator according to an embodiment of the present invention (I);

[0029] Figure 11 Schematic diagram of the structure of the stator according to an embodiment of the present invention (II);

[0030] Figure 12 Schematic diagram of the structure of a compressor according to an embodiment of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 1. Rotor core; 2. First core; 3. Second core; 4. Permanent magnet; 5. First permanent magnet piece; 6. Second permanent magnet piece; 7. Permanent magnet slot; 8. First magnetic isolation bridge hole; 9. Second magnetic isolation bridge hole; 10. Third magnetic isolation bridge hole; 11. Squirrel cage; 12. Squirrel cage bar; 13. Squirrel cage ring; 14. Squirrel cage slot; 15. Connecting hole; 16. Connecting piece; 17. Baffle; 18. Shaft hole; 19. Stator core; 20. Winding; 21. Insulation slot; 22. Insulation paper; 23. Stator flow slot; 24. Tooth; 25. Yoke; 26. Motor body; 27. Motor shaft; 28. Motor stator assembly cylinder; 29. ​​Motor balance block. Implementation Method

[0033] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] Example 1

[0035] Combined with attachment Figures 1-11 As shown, this embodiment provides a permanent magnet motor, including a rotor and a stator. The rotor includes components such as a rotor core 1, a squirrel cage 11 and a permanent magnet 4, and the stator includes components such as a stator core 19 and a winding 20. The structural features and improvements of the rotor and stator of this embodiment are further described below.

[0036] Combined with attachment Figures 1-7As shown, the rotor core 1 of the embodiment is composed of three segmented cores, namely the first core 2 and two second cores 3 in the figure, the two second cores 3 are respectively located at the two ends of the first core 2, and the three are coaxially arranged, the middle of the first core 2 and the second core 3 are respectively provided with an axle hole 18 for the motor shaft 27 to pass through, the first core 2 and the second core 3 of the embodiment are provided with permanent magnet grooves 7 (or permanent magnet 4 holes), the permanent magnet groove 7 of the first core 2 and the permanent magnet groove 7 of the second core 3 jointly form a space for accommodating the permanent magnet 4, the setting of the two second cores 3 can gather magnetic energy, and then transmit it to the first core 2 along the axial direction, improve the magnetic energy utilization rate of the permanent magnet motor, and further improve the working efficiency of the permanent magnet motor.

[0037] The rotor of the embodiment further has two circular baffles 17 outside the two rotor cores 1, the baffles 17 are coaxially arranged with the first core 2 and the second core 3, and the baffles 17 are also provided with an axle hole 18 for the motor shaft 27 to pass through, the baffles 17, the first core 2 and the second core 3 of the embodiment are provided with a plurality of connecting holes 15, and the connecting pieces 16 pass through the connecting holes 15 to connect the three into one whole, specifically, the connecting pieces 16 can be rivets or screws and the like structure.

[0038] One of the improvements of the permanent magnet motor of the embodiment is that at least one of the opposite ends of the permanent magnet groove 7 of the rotor core 1 is communicated with a first magnetic separation bridge hole 8 in the radial direction of the rotor core 1, preferably, the opposite ends of the permanent magnet groove 7 of the embodiment are respectively communicated with two first magnetic separation bridge holes 8; more preferably, the permanent magnet groove 7 and the first magnetic separation bridge hole 8 of the embodiment are integrally formed during processing, so the first magnetic separation bridge hole 8 can be regarded as a part of the permanent magnet groove 7. The first magnetic separation bridge hole 8 of the embodiment improves the magnetic separation capability of the permanent magnet synchronous motor, reduces the probability of magnetic leakage, and further improves the working efficiency of the permanent magnet motor.

[0039] In addition, in order to further improve the anti-magnetic leakage capability of the rotor core, the embodiment further provides a second magnetic separation bridge hole 9 between the two adjacent permanent magnet grooves 7, the second magnetic separation bridge hole 9 is filled with a magnetic separation fluid, which can be frozen oil or other fluid refrigerant, which not only can play a role in preventing magnetic leakage, but also can facilitate heat exchange of the rotor.

[0040] In combination with the drawings Figures 4-7 As shown, the hole diameter of the second magnetic separation bridge hole 9 close to the connecting hole 15 of the embodiment is smaller than the hole diameter of the second magnetic separation bridge hole 9 away from the connecting hole 15, that is, the second magnetic separation bridge hole 9 of the embodiment has two size specifications, one is a larger second magnetic separation bridge hole 9, and the other is a smaller second magnetic separation bridge hole 9 to avoid the above-mentioned connecting hole 15, so as not to affect each other.

[0041] In addition to the above improvements, the permanent magnet 4 and the permanent magnet slot 7 are improved in structure, the permanent magnet slot 7 is designed in a V shape, the permanent magnet 4 is also in a V shape, and the permanent magnet 4 is gap-fitted with the permanent magnet slot 7 to facilitate the installation of the permanent magnet 4. Figure 1 The permanent magnet 4 of the embodiment includes a first permanent magnet piece 5 and a second permanent magnet piece 6 at an angle, and the first permanent magnet piece 5 and the second permanent magnet piece 6 have an installation gap therebetween. The structure of the permanent magnet 4 can increase the magnetic flux of the permanent magnet 4 and further improve the working efficiency of the motor.

[0042] Based on the above structure, in order to realize the self-starting of the permanent magnet motor (self-starting refers to that the motor does not turn off when the voltage is reduced, and directly accelerates when the voltage is restored), the rotor of the embodiment further includes a squirrel cage 11, which is combined with the attached Figure 1 It can be known that the squirrel cage 11 of the embodiment includes a plurality of squirrel cage bars 12 and two squirrel cage rings 13 located at both ends of the squirrel cage bars 12, the squirrel cage rings 13 are connected with the plurality of squirrel cage bars 12 respectively, the squirrel cage bars 12 are formed into a squirrel cage 11 structure by using die-casting aluminum process after being laminated in the rotor core 1, and the self-starting torque is generated under the induction of the energization of the stator coil, so that the motor starts to operate.

[0043] The outer periphery of the first core 2 is provided with a plurality of squirrel cage slots 14, the plurality of squirrel cage bars 12 are installed in the plurality of squirrel cage slots 14 one by one, and the two second cores 3 are respectively arranged in the two squirrel cage rings 13 and gap-fitted with the two squirrel cage rings 13.

[0044] Combined with the attached Figures 3-7 As shown in the attached, in the radial direction of the rotor core 1, the end face of the squirrel cage slot 14 is integrally composed of an inner end portion, a main body portion and an outer end portion; the inner end portion is in a flat bottom shape, the main body portion is in a trapezoidal shape with a narrow inner part and a wide outer part, the outer end portion is trapezoidal on both sides, and the outer end portion is composed of a small circular arc with the same center as the shaft hole 18. Through the improvement of the squirrel cage slot 14, the starting performance and efficiency of the compressor motor can be improved, the 3rd harmonic can be effectively filtered out, the axial movement of the motor rotor can be prevented, and the noise of the motor can be reduced. In addition, in order to further improve the magnetic isolation effect, the squirrel cage slot 14 of the embodiment can be further connected with a third magnetic isolation bridge hole 10 to further increase the magnetic isolation effect.

[0045] Combined with the attached Figures 8-11As shown, on the basis of the above rotor structure, the stator structure of the embodiment is improved, the stator comprises a stator core 19 and a winding 20 installed on the stator core 19, the stator core is matched in size with the tooth portion 24 and the yoke portion 25, so that the leakage reactance, slot fill factor, tooth portion magnetic density and yoke portion magnetic density of the motor are within a reasonable range. The stator core 19 is provided with a plurality of insulation grooves 21, and the insulation paper 22 matched with the insulation grooves 21 is placed in the insulation grooves 21. When the insulation paper 22 is installed, the edge of the insulation paper 22 is inserted into the limiting groove, so as to limit the insulation paper 22, and then the insulation paper 22 is limited in the insulation groove 21 of the stator core 19, so as to avoid the movement of the insulation paper 22. The insulation paper 22 is used to replace the insulation framework in the prior art, so as to reduce the number of parts and the mold manufacturing cost.

[0046] Furthermore, the embodiment further comprises a plurality of stator flow grooves 23 formed on the outer wall of the stator core 19 along the circumferential direction, so that the yoke portions corresponding to the adjacent two flow grooves form a ring-shaped magnetic circuit, and the magnetic flux leakage is further reduced.

[0047] In addition, the processing form of the rotor core 1 and the stator core 19 is improved, the rotor core 1 and the stator core 19 are both formed by stamping an electrical steel strip (plate) and then laminating, the material is self-adhesive silicon steel sheet, and all the rotor stamping pieces and the stator stamping pieces are non-docking point structures, which can reduce the iron loss and improve the motor efficiency.

[0048] Embodiment two

[0049] Combined with the drawings Figure 12 As shown, the compressor provided by the embodiment comprises a body 26, a motor stator assembly cylinder 28, a motor balance block 29 and the permanent magnet motor described in the above embodiment. The permanent magnet motor is installed in the body 26, and the stator of the permanent magnet motor is installed on the stator assembly cylinder. The other structures of the permanent magnet motor have been given in the above embodiment, and thus the embodiment will not be described in detail. The remaining structures of the compressor are the same as those in the prior art, and thus the other components of the compressor will not be described in the embodiment, but the structure and principle of the compressor can be known by those skilled in the art.

[0050] Embodiment three

[0051] The air conditioner provided by the embodiment has the compressor described in embodiment two. The improvement of the air conditioner of the embodiment is only in the structure of the permanent magnet motor of the compressor, and the remaining structures of the air conditioner are the same as those in the prior art. Thus, the air conditioner will not be described in the embodiment, and the other components of the air conditioner will not be described in the embodiment, but the structure and principle of the air conditioner can be known by those skilled in the art.

[0052] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as a limitation on the application.

[0053] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0054] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" 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, etc. 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.

[0055] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as a limitation on the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A permanent magnet motor, comprising a rotor core (1), a stator core (19) and a connector (16), wherein a plurality of permanent magnet slots (7) are provided in the rotor core (1) along its circumference, and a plurality of permanent magnets (4) are mounted in the plurality of permanent magnet slots (7) in a one-to-one correspondence, characterized in that: On the radial cross section of the rotor core (1), at least one of the two opposite ends of the permanent magnet slot (7) is connected to a first magnetic isolation bridge hole (8); A second magnetic isolation bridge hole (9) is provided between two adjacent permanent magnet slots (7), and the second magnetic isolation bridge hole (9) is filled with magnetic isolation fluid; The rotor core (1) comprises a first core (2) and a second core (3); the two second cores (3) are respectively arranged at two ends of the first core (2); The first iron core (2) and the second iron core (3) are each provided with at least one connecting hole (15), and the connecting member (16) passes through the connecting hole (15) and connects the first iron core (2) and the second iron core (3); When a second magnetic isolation bridge hole (9) is provided between two adjacent permanent magnet slots (7), the aperture of the second magnetic isolation bridge hole (9) close to the connecting hole (15) is smaller than the aperture of the second magnetic isolation bridge hole (9) away from the connecting hole (15).

2. The permanent magnet motor according to claim 1, characterized in that The permanent magnet slot (7) is V-shaped; the permanent magnet (4) and the permanent magnet slot (7) are clearance-matched.

3. The permanent magnet motor according to claim 2, characterized in that: The permanent magnet (4) comprises a first permanent magnet piece (5) and a second permanent magnet piece (6) which are angled with each other, and there is an installation gap between the first permanent magnet piece (5) and the second permanent magnet piece (6).

4. The permanent magnet motor according to claim 1, characterized in that The invention also includes a cage (11), wherein the cage (11) includes a plurality of cage bars (12) and two cage rings (13) located at both ends of the cage bars (12), and the cage rings (13) are respectively connected to the plurality of cage bars (12); a plurality of cage slots (14) are provided on the outer periphery of the first iron core (2), the plurality of cage bars (12) are installed in the plurality of cage slots (14) in a one-to-one correspondence, and the two second iron cores (3) are respectively placed in the two cage rings (13).

5. The permanent magnet motor according to any one of claims 1 to 2, characterized in that: The stator core (19) is provided with an insulation slot (21), and insulation paper (22) is inserted into the insulation slot (21).

6. The permanent magnet motor according to any one of claims 1 to 2, characterized in that: The outer wall of the stator core (19) is provided with a plurality of stator flow slots (23) along its circumference.

7. A compressor, characterized in that: It comprises the permanent magnet motor according to any one of claims 1 to 6.

8. An air conditioner, characterized in that: It comprises the compressor according to claim 7.

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