Tangential permanent magnet motor rotor assembly, tangential permanent magnet synchronous motor and air conditioner

Abstract

The utility model provides a tangential permanent magnet motor rotor assembly, a tangential permanent magnet synchronous motor and an air conditioner, a rotor core of the tangential permanent magnet motor rotor assembly is provided with a plurality of first magnetic steel grooves, each tangential permanent magnet is arranged in each first magnetic steel groove, and each first magnetic steel groove comprises a radial outer groove wall. The radial outer side slot wall comprises a limiting section for forming radial limiting on the radial outer end of the tangential permanent magnet, a first side section and a second side section, a first magnetic isolation bridge is formed between the limiting section and the outer circumferential wall surface of the rotor core, and a second magnetic isolation bridge is formed between the first side section and the outer circumferential wall surface of the rotor core; a third magnetic isolation bridge is formed between the second side edge section and the outer circumferential wall face, and the radial thickness of the first magnetic isolation bridge is larger than the radial thickness of the second magnetic isolation bridge and the radial thickness of the third magnetic isolation bridge. According to the utility model, the torque pulsation of the motor rotor in the operation process can be obviously reduced while reliable radial limiting of the tangential permanent magnets is realized, the vibration noise of the motor is reduced, and the stable operation of the motor is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor design, and in particular relates to a tangential permanent magnet motor rotor component, a tangential permanent magnet synchronous motor and an air conditioner. Background Art

[0002] Traditional tangential permanent magnet synchronous motors use rare earth permanent magnets to provide the main magnetic field tangentially. The leakage magnetic field at both ends of the permanent magnets is particularly serious, which restricts its efficient application. In the related art, in order to reduce the leakage magnetic field of the radial outer end of the tangential permanent magnet, that is, close to the motor stator, the radial outer center position of each magnetic steel slot used to accommodate the tangential permanent magnet is often designed as an opening. This structure can significantly reduce the leakage magnetic field of the radial outer end of the tangential permanent magnet, improve the magnetic utilization rate of the motor and thus improve the motor performance. However, due to the design of the opening structure on the outer circumferential wall of the rotor core, the torque pulsation of the motor is large during operation, and the motor operation noise is large. Utility Model Content

[0003] Therefore, the utility model provides a tangential permanent magnet motor rotor assembly, a tangential permanent magnet synchronous motor, and an air conditioner, which can solve the technical problems in the prior art that an opening structure is formed on the outer circumferential wall of the tangential permanent magnet motor rotor assembly to prevent magnetic leakage, resulting in large torque pulsation and large motor operating noise during operation of the motor.

[0004] In order to solve the above problems, the utility model provides a tangential permanent magnet motor rotor assembly, including a rotor core and a plurality of tangential permanent magnets, wherein the rotor core is constructed with a shaft hole penetrating through both ends thereof and a plurality of first magnetic steel slots, wherein each of the first magnetic steel slots is evenly spaced around the shaft hole, and each of the tangential permanent magnets is fixed in each of the first magnetic steel slots in a one-to-one correspondence, and the end faces of two adjacent tangential permanent magnets have the same polarity, and the first magnetic steel slots include radial outer slot walls and magnetic isolation slots located on both circumferential sides of the tangential permanent magnets and adjacent to the radial ends of the tangential permanent magnets. The radial outer groove wall includes a limiting section for forming a radial limit on the radial outer end of the tangential permanent magnet, and a first side section and a second side section which are located at both circumferential ends of the limiting section and correspond to the two magnetic isolation groove sections respectively. A first magnetic isolation bridge is formed between the limiting section and the outer circumferential wall surface of the rotor core, a second magnetic isolation bridge is formed between the first side section and the outer circumferential wall surface, and a third magnetic isolation bridge is formed between the second side section and the outer circumferential wall surface, wherein the radial thickness of the first magnetic isolation bridge is greater than the radial thickness of the second magnetic isolation bridge and the third magnetic isolation bridge.

[0005] In some embodiments, the tangential permanent magnet has a magnetic steel symmetry line that coincides with a diameter of the rotor core, the second magnetic isolation bridge and the third magnetic isolation bridge are symmetrical about the magnetic steel symmetry line, and the symmetry line of the first magnetic isolation bridge coincides with the magnetic steel symmetry line, and the two magnetic isolation grooves are symmetrical about the magnetic steel symmetry line.

[0006] In some embodiments, the radial thickness of the first magnetic isolation bridge is equal to B2, and the radial thickness of the second magnetic isolation bridge and the third magnetic isolation bridge are equal to B1.

[0007] In some embodiments, B1 <B2≤4.2*B1。

[0008] In some embodiments, the circumferential thickness of the tangential permanent magnet is HL, the circumferential width of the first magnetic isolation bridge is Hb2, 0.75*HL≤Hb2≤1.3*HL; and / or the circumferential widths of the second magnetic isolation bridge and the third magnetic isolation bridge are both Hb1, Hb1≥1.1*HL.

[0009] In some embodiments, the first magnetic isolation bridge is gradually connected to the second magnetic isolation bridge and the third magnetic isolation bridge respectively through a connecting magnetic isolation bridge; and / or the maximum circumferential width between the two magnetic isolation grooves is Bm, 3*HL≤Bm.

[0010] In some embodiments, the circumferential width of each of the connecting magnetic isolation bridges is BL, and 2*BL≤HL.

[0011] In some embodiments, the radial length of the circumferential side of the tangential permanent magnet corresponding to the magnetic isolation groove is BLm, and BLm≤HL.

[0012] In some embodiments, second magnetic steel slots are further constructed on the rotor core, and the second magnetic steel slots are evenly spaced around the circumference of the rotating shaft hole and are located in the area between the radial inner ends of two adjacent tangential permanent magnets. A radial permanent magnet is fixed in each of the second magnetic steel slots, the number of the tangential permanent magnets is P, and the number of the radial permanent magnets is P / 2.

[0013] In some embodiments, an air slot is formed at a position of the rotor core corresponding to the radial inner end of each of the tangential permanent magnets, and the maximum circumferential width of the air slot is greater than the circumferential thickness of the tangential permanent magnet.

[0014] In some embodiments, the second magnetic steel groove is connected to the two air grooves on both sides of the second magnetic steel groove.

[0015] The utility model also provides a tangential permanent magnet synchronous motor, comprising the above-mentioned tangential permanent magnet motor rotor assembly.

[0016] The utility model also provides an air conditioner, comprising the above-mentioned tangential permanent magnet synchronous motor.

[0017] The utility model provides a tangential permanent magnet motor rotor assembly, a tangential permanent magnet synchronous motor, and an air conditioner, which have the following beneficial effects:

[0018] The open groove at the radial outer end of the traditional tangential permanent magnet is formed into a closed structure with a magnetic isolation bridge with a large thickness in the middle and small thickness on both sides in the present application. This can achieve reliable radial limitation of the tangential permanent magnet and significantly reduce the torque pulsation of the motor rotor during operation, thereby reducing the vibration noise of the motor and ensuring the smooth operation of the motor. In addition, since the first magnetic steel slot in the present application has magnetic isolation groove portions corresponding to the circumferential sides of the tangential permanent magnet, it can effectively reduce the leakage magnetic phenomenon at the radial outer end of the tangential permanent magnet and ensure the utilization rate of the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 1 is a schematic diagram of an axial projection of a tangential permanent magnet motor rotor assembly in an embodiment of the present invention. It can be understood that the gap between the permanent magnet and the slot wall of the corresponding magnetic steel slot shown in the figure is only a way to distinguish the two, and does not mean that there is a gap between the two after actual assembly;

[0021] Figure 2 : is a schematic diagram (partial) of an axial projection of a tangential permanent magnet motor rotor assembly in another embodiment of the utility model. It can be understood that the gap between the permanent magnet and the slot wall of the corresponding magnetic steel slot shown in the figure is only a way to facilitate the distinction between the two, and does not mean that there is a gap between the two after actual assembly;

[0022] Figure 3 yes Figure 2 Dimensional markings on the axial projection of the tangential permanent magnet motor rotor assembly;

[0023] Figure 4 It is a simulation diagram of the output torque waveform of the technical solution of the utility model (non-open slot) and the tangential permanent magnet motor rotor assembly with open slots in the prior art.

[0024] The accompanying drawings are marked as follows:

[0025] 1. Rotor core; 11. Shaft hole; 12. First magnetic steel slot; 121. Limiting section; 122. First side section; 123. Second side section; 131. First magnetic isolation bridge; 132. Second magnetic isolation bridge; 133. Third magnetic isolation bridge; 14. Magnetic isolation slot; 15. Air slot; 2. Tangential permanent magnet; 3. Radial permanent magnet. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0030] See also Figures 1 to 4 As shown, according to an embodiment of the utility model, a tangential permanent magnet motor rotor assembly is provided, comprising a rotor core 1 and a plurality of tangential permanent magnets 2, wherein the rotor core 1 is provided with a shaft hole 11 penetrating through both ends thereof and a plurality of first magnetic steel slots 12, wherein the first magnetic steel slots 12 are evenly spaced around the shaft hole 11, and the tangential permanent magnets 2 are fixed in the first magnetic steel slots 12 one by one (the specific fixing method may be pasting or a corresponding limiting structure connection method, which is not particularly limited in the utility model), and the end faces of two adjacent tangential permanent magnets 2 have the same polarity (for example Figure 1 As shown, the polarities of the opposite end faces of two adjacent tangential permanent magnets 2 are both N poles or both S poles), the first magnetic steel slot 12 includes a radial outer slot wall and a magnetic isolation slot portion 14 located on both circumferential sides of the tangential permanent magnet 2 and adjacent to the radial end of the tangential permanent magnet 2, the radial outer slot wall includes a limiting segment 121 for radially limiting the radial outer end of the tangential permanent magnet 2, and a first side segment 122 and a second side segment 123 located at both circumferential ends of the limiting segment 121 and corresponding to the two magnetic isolation slot portions 14 respectively, a first magnetic isolation bridge 131 is formed between the limiting segment 121 and the outer circumferential wall surface of the rotor core 1, a second magnetic isolation bridge 132 is formed between the first side segment 122 and the outer circumferential wall surface, and a third magnetic isolation bridge 133 is formed between the second side segment 123 and the outer circumferential wall surface, wherein the radial thickness of the first magnetic isolation bridge 131 (i.e. Figure 3 B2 in the figure is greater than the radial thickness of the second magnetic isolation bridge 132 and the third magnetic isolation bridge 133 (i.e. Figure 3 in B1).

[0031] In this technical solution, the open groove at the radial outer end of the traditional tangential permanent magnet is formed into a closed structure by using the magnetic isolation bridge with a large thickness in the middle and small thickness on both sides in the present application. This can achieve reliable radial limitation of the tangential permanent magnet and significantly reduce the torque pulsation of the motor rotor during operation, thereby reducing the vibration noise of the motor and ensuring the smooth operation of the motor. In addition, since the first magnetic steel slot 12 in the present application has magnetic isolation groove portions 14 on both sides of the circumferential direction of the tangential permanent magnet 2, the leakage magnetic phenomenon at the radial outer end of the tangential permanent magnet 2 can be effectively reduced, thereby ensuring the utilization rate of the permanent magnet. Specifically, the leakage magnetic field of the tangential permanent magnet flows along the magnetic isolation bridge near it to form a closed magnetic field. The radial width of the magnetic isolation bridge can regulate the leakage magnetic field. If the width is too large, the leakage magnetic field will be greater, and if the width is too small, the leakage magnetic field will be less. However, local saturation of the magnetic field will appear on the magnetic isolation bridge, forming a rich harmonic magnetic field, thereby bringing about a larger torque pulsation. In other words, as its width decreases, the leakage magnetic field will be smaller, but because of the magnetic mutation caused by the local saturation of the magnetic field, the torque pulsation will greatly increase. The utility model is set in a closed form, which can effectively alleviate this problem. Furthermore, the width of the magnetic isolation bridge in the middle part facing the tangential permanent magnet is set to be greater than the width of the magnetic isolation bridges on both sides, which can further effectively alleviate this local saturation, reduce the distortion of the magnetic field caused by saturation, and improve the harmonics of the magnetic field.

[0032] In some embodiments, the tangential permanent magnet 2 has a magnetic steel symmetry line (not marked in the figure) that coincides with a diameter of the rotor core 1, the second magnetic isolation bridge 132 and the third magnetic isolation bridge 133 are symmetrical about the magnetic steel symmetry line, and the symmetry line of the first magnetic isolation bridge 131 coincides with the magnetic steel symmetry line, and the two magnetic isolation grooves 14 are symmetrical about the magnetic steel symmetry line.

[0033] In this technical solution, the second magnetic isolation bridge 132, the third magnetic isolation bridge 133 and the two magnetic isolation grooves 14 are all symmetrical about the magnetic steel symmetry line. At the same time, the first magnetic isolation bridge 131 itself is symmetrical about the magnetic steel symmetry line, which can make the leakage magnetic conditions on the side of each tangential permanent magnet 2 under each magnetic pole exactly the same, further reducing torque pulsation.

[0034] In some embodiments, the radial thickness of the first magnetic isolation bridge 131 is equal, which is B2, and the radial thicknesses of the second magnetic isolation bridge 132 and the third magnetic isolation bridge 133 are equal and both are B1. That is, the bridge widths of the first magnetic isolation bridge 131, the second magnetic isolation bridge 132, and the third magnetic isolation bridge 133 extending along the circumferential direction of the rotor core 1 are equal, so that the magnetic circuit on this part is evenly distributed, which is further beneficial to reducing torque ripple. At this time, it can be understood that the foregoing limiting section 121, the first side section 122, and the second side section 123 are all arc wall surfaces concentric with the outer circumferential wall of the rotor core 1. A small air gap is formed between the limiting section 121 and the plane of the radially outer end face of the tangential permanent magnet 2, which can also further reduce the magnetic leakage at the radially outer end of the tangential permanent magnet 2.

[0035] In some embodiments, B1 < B2 ≤ 4.2 * B1. By limiting the width of the magnetic isolation bridge within this range, the regulation of the magnetic flux density passing through is realized, and the torque ripple can be further reduced.

[0036] In some embodiments, the circumferential thickness of the tangential permanent magnet 2 is HL, and the circumferential width of the first magnetic isolation bridge 131 is Hb2, 0.75 * HL ≤ Hb2 ≤ 1.3 * HL. Specifically, Hb2 can regulate the saturation value amplitude on the magnetic isolation bridge. If its width is too small, the saturation value is larger and the regulation amplitude is weaker, resulting in larger torque ripple. If its width is too large, the regulation amplitude is stronger, but the average value of the output torque is affected; and / or, the circumferential widths of the second magnetic isolation bridge 132 and the third magnetic isolation bridge 133 are both Hb1, Hb1 ≥ 1.1 * HL. Specifically, if the width of Hb1 is too small, the magnetic field passes through fewer magnetic isolation intervals of the magnetic isolation bridge, and the magnetic isolation effect is limited. When it is greater than 1.1 times, there is an obvious magnetic isolation effect.

[0037] In some embodiments, the first magnetic isolation bridge 131 is gradually connected to the second magnetic isolation bridge 132 and the third magnetic isolation bridge 133 through the connecting magnetic isolation bridge 134, so that the magnetic field from the first magnetic isolation bridge 131 to the second magnetic isolation bridge 132 or the third magnetic isolation bridge 133 will not mutate and cause magnetic field deterioration. For details, see Figure 2As shown, the aforementioned gradual change means that in the direction from the second magnetic isolation bridge 132 to the first magnetic isolation bridge 131, the radial thickness of the connecting magnetic isolation bridge 134 becomes larger and larger. At the same time, in the direction from the third magnetic isolation bridge 133 to the first magnetic isolation bridge 131, the radial thickness of the connecting magnetic isolation bridge 134 becomes larger and larger. The circumferential width of each connecting magnetic isolation bridge 134 is BL, 2*BL≤HL. Specifically, the larger the BL is, the larger the path of the leakage magnetic field. Although the leakage magnetic field is reduced, the main magnetic field is also weakened. It has a certain relationship with the width of the tangential magnetic steel slot. When BL takes a suitable value, the two are balanced and have an optimal value; and / or, the maximum circumferential width between the two magnetic isolation slots 14 is Bm, 3*HL≤Bm, which can balance the torque pulsation and output size.

[0038] In some embodiments, the radial length of the circumferential side of the tangential permanent magnet 2 corresponding to the magnetic isolation groove 14 is BLm, BLm≤HL, which can effectively adjust the torque pulsation to a reasonable range.

[0039] In some embodiments, the rotor core 1 is further configured with second magnetic steel slots, which are evenly spaced around the circumference of the shaft hole 11 and are located in the area between the radial inner ends of two adjacent tangential permanent magnets 2. A radial permanent magnet 3 is fixed in each of the second magnetic steel slots. The number of the tangential permanent magnets 2 is P, and the number of the radial permanent magnets 3 is P / 2. For example, Figure 1 As shown, P=8, then the number of radial permanent magnets 3 is 4, wherein the tangential permanent magnets 2 , that is, the magnetizing direction, are along the tangential direction of the rotor core 1 , and the radial permanent magnets 3 , that is, the magnetizing direction, are along the radial direction of the rotor core 1 .

[0040] In this technical solution, a radial permanent magnet 3 is arranged at the radial inner end of the tangential permanent magnet 2, and the polarity is kept the same (for example Figure 1 In the embodiment shown in , each radial permanent magnet 3 is arranged under the N pole), and the magnetic field provided by the radial permanent magnet 3 is in the same direction as the magnetic field provided by the tangential permanent magnet 2. In this way, the magnetic field provided by the radial permanent magnet 3 can effectively suppress the magnetic field leakage from the end of the tangential permanent magnet 2 close to the center of the rotor, improve the utilization rate of the permanent magnet, effectively reduce torque pulsation, and also have the effect of magnetic concentration.

[0041] In some embodiments, air slots 15 are formed at positions corresponding to the radial inner ends of the rotor core 1 and each of the tangential permanent magnets 2, and the maximum circumferential width of the air slots 15 is greater than the circumferential thickness of the tangential permanent magnets 2, so that the air slots 15 can be used to further prevent magnetic leakage from the radial inner ends of the tangential permanent magnets 2.

[0042] In some embodiments, the second magnetic steel slot is connected to the two air slots 15 on both sides of the second magnetic steel slot. In this way, two adjacent tangential permanent magnets 2 and one radial permanent magnet 3 can all be located in the space of one magnetic steel slot, which theoretically completely solves the magnetic leakage problem near the center end.

[0043] According to an embodiment of the present utility model, a tangential permanent magnet synchronous motor is further provided, comprising the above-mentioned tangential permanent magnet motor rotor assembly.

[0044] See Figure 4 As shown, the average torque values ​​of the tangential permanent magnet rotors of the two structures are equal, that is, they have the same leakage flux, the effective magnetic flux formed is equal, and the average output torque generated is equal, but the fluctuation values ​​of the output torque are very different. The tangential permanent magnet motor rotor assembly of the structure of the present application can significantly reduce the fluctuation value.

[0045] According to an embodiment of the utility model, an air conditioner is also provided, comprising the above-mentioned tangential permanent magnet synchronous motor.

[0046] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0047] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A tangential permanent magnet motor rotor assembly, characterized in that: The invention comprises a rotor core (1) and a plurality of tangential permanent magnets (2), wherein the rotor core (1) is provided with a shaft hole (11) passing through both ends thereof and a plurality of first magnetic steel slots (12), wherein each of the first magnetic steel slots (12) is evenly spaced around the shaft hole (11), each of the tangential permanent magnets (2) is fixed in each of the first magnetic steel slots (12) in a one-to-one correspondence, and the end faces of two adjacent tangential permanent magnets (2) have the same polarity, and the first magnetic steel slots (12) comprise radial outer slot walls and magnetic isolation slot portions (14) located on both circumferential sides of the tangential permanent magnets (2) and adjacent to the radial ends of the tangential permanent magnets (2), wherein the radial outer slot walls comprise radial outer portions of the tangential permanent magnets (2). A limiting segment (121) for radial limiting is formed at the end thereof, and a first side segment (122) and a second side segment (123) are located at the two circumferential ends of the limiting segment (121) and correspond to the two magnetic isolation grooves (14) respectively; a first magnetic isolation bridge (131) is formed between the limiting segment (121) and the outer circumferential wall surface of the rotor core (1); a second magnetic isolation bridge (132) is formed between the first side segment (122) and the outer circumferential wall surface; and a third magnetic isolation bridge (133) is formed between the second side segment (123) and the outer circumferential wall surface; wherein the radial thickness of the first magnetic isolation bridge (131) is greater than the radial thickness of the second magnetic isolation bridge (132) and the third magnetic isolation bridge (133).

2. The tangential permanent magnet motor rotor assembly according to claim 1, characterized in that: The tangential permanent magnet (2) has a magnetic steel symmetry line that coincides with a diameter of the rotor core (1); the second magnetic isolation bridge (132) and the third magnetic isolation bridge (133) are symmetrical about the magnetic steel symmetry line; the symmetry line of the first magnetic isolation bridge (131) coincides with the magnetic steel symmetry line; and the two magnetic isolation grooves (14) are symmetrical about the magnetic steel symmetry line.

3. The tangential permanent magnet motor rotor assembly according to claim 1, characterized in that: The radial thickness of the first magnetic isolation bridge (131) is equal to B2, and the radial thickness of the second magnetic isolation bridge (132) and the third magnetic isolation bridge (133) are equal to B1.

4. The tangential permanent magnet motor rotor assembly according to claim 3, characterized in that: B1 <B2≤4.2*B1。 5. The tangential permanent magnet motor rotor assembly according to claim 1, characterized in that: The circumferential thickness of the tangential permanent magnet (2) is HL, the circumferential width of the first magnetic isolation bridge (131) is Hb2, 0.75*HL≤Hb2≤1.3*HL; and / or the circumferential widths of the second magnetic isolation bridge (132) and the third magnetic isolation bridge (133) are both Hb1, Hb1≥1.1*HL.

6. The tangential permanent magnet motor rotor assembly according to claim 5, characterized in that: The first magnetic isolation bridge (131) is gradually connected to the second magnetic isolation bridge (132) and the third magnetic isolation bridge (133) via a connecting magnetic isolation bridge (134); and / or the maximum circumferential width between the two magnetic isolation grooves (14) is Bm, and 3*HL≤Bm.

7. The tangential permanent magnet motor rotor assembly according to claim 6, characterized in that: The circumferential width of each of the connecting magnetic isolation bridges (134) is BL, and 2*BL≤HL.

8. The tangential permanent magnet motor rotor assembly according to claim 5, characterized in that: The radial length of one side of the circumferential direction of the tangential permanent magnet (2) corresponding to the magnetic isolation groove (14) is BLm, and BLm≤HL.

9. The tangential permanent magnet motor rotor assembly according to claim 1, characterized in that: The rotor core (1) is also provided with second magnetic steel slots, which are evenly spaced around the circumference of the shaft hole (11) and are located in the area between the radial inner ends of two adjacent tangential permanent magnets (2), and each of the second magnetic steel slots is respectively fixed with a radial permanent magnet (3), the number of the tangential permanent magnets (2) is P, and the number of the radial permanent magnets (3) is P / 2.

10. The tangential permanent magnet motor rotor assembly according to claim 9, characterized in that: An air slot (15) is formed at a position of the rotor core (1) corresponding to the radial inner end of each of the tangential permanent magnets (2); the maximum circumferential width of the air slot (15) is greater than the circumferential thickness of the tangential permanent magnet (2).

11. The tangential permanent magnet motor rotor assembly according to claim 10, characterized in that: The second magnetic steel groove is in communication with the two air grooves (15) on both sides of the second magnetic steel groove.

12. A tangential permanent magnet synchronous motor, characterized in that: A tangential permanent magnet motor rotor assembly comprising any one of claims 1 to 11.

13. An air conditioner, characterized in that: Including the tangential permanent magnet synchronous motor as described in claim 12.

Images