A rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor

Abstract

The application discloses a rotor for a permanent magnet synchronous motor and the permanent magnet synchronous motor. The rotor for the permanent magnet synchronous motor comprises a rotor core, a plurality of magnetic pole slots extending along an axial direction are arranged on the rotor core, permanent magnets extending along an axial line are arranged in the magnetic pole slots, an outer surface of the rotor core is provided with a plurality of auxiliary slots, the auxiliary slots are independent of the magnetic pole slots, and the auxiliary slots have an offset angle. By using the above scheme, the motor cogging torque can be reduced, the air gap magnetic density waveform can be corrected, the sine degree of the back electromotive force waveform can be improved, the noise and vibration caused by the motor body defects can be reduced, and the electromagnetic performance of the motor can be improved. The scheme can avoid the increase of the assembly process caused by the traditional rotor skew pole, meanwhile, the structure strength of the motor rotor punching sheet is not affected, the position and axial shape of the auxiliary slot are selected more, in some specific positions, the motor noise and vibration performance can be improved, and the motor output can not be reduced or even be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotors, in particular to a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor. BACKGROUND

[0002] At present, due to the existence of the rotor permanent magnet, the permanent magnet synchronous motor has cogging torque and no-load back electromotive force, and the amplitude of the cogging torque and the THD value of the no-load back electromotive force affect the noise and vibration of the motor to a certain extent. The amplitude of the cogging torque and the THD value can be weakened by some means such as rotor skew, stator skew, unequal air gap, auxiliary slot, etc. When the unequal air gap and the auxiliary slot cannot reduce the cogging torque and the THD value to the design requirement, the rotor skew and the stator skew can be used in combination, wherein the rotor skew is generally a segmented skew, and the stator skew is generally a continuous skew.

[0003] When the motor is a concentrated winding, the application of skew will increase the difficulty of automatic winding, so more rotor skew methods are used. However, the current rotor skew method still has the problem of large noise and vibration of the motor. In addition, when the axial length of the motor core is short, it is not convenient to apply the optimization method of rotor skew. The scheme proposed in this paper is not affected by the form of stator winding and can be applied to concentrated winding and distributed winding. It is not affected by the length of the core axial length and has a wide range of application. SUMMARY

[0004] The present application provides a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor to solve the problem of large noise and vibration of the motor.

[0005] According to a first aspect of the present application, a rotor for a permanent magnet synchronous motor is provided, comprising a rotor core, a plurality of magnetic pole slots extending along the axial direction are arranged on the rotor core, and permanent magnets extending along the axial direction are arranged in the magnetic pole slots; a plurality of auxiliary slots are arranged on the outer surface of the rotor core, and the auxiliary slots are independent of the magnetic pole slots;

[0006] The auxiliary slots have an offset angle.

[0007] In an optional embodiment of the present application, the auxiliary slots are arranged on the outer surface area of the rotor core opposite to the permanent magnets.

[0008] In an optional embodiment of the present application, the number of auxiliary slots on the outer surface area of the rotor core opposite to each permanent magnet is one or more.

[0009] In an optional embodiment of the present application, the part of the rotor core between the magnetic pole slots and the outer surface of the rotor core forms a first magnetic isolation bridge.

[0010] a second magnetic isolation bridge is formed between the auxiliary slot and the magnetic pole slot;

[0011] The first magnetic isolation bridge and the second magnetic isolation bridge satisfy: h1≦h2≦1.5h1, h1≦w2≦w1, wherein h1 is the thickness of the first magnetic isolation bridge, h2 is the thickness of the second magnetic isolation bridge, w1 is the length of the first magnetic isolation bridge, and w2 is the length of the second magnetic isolation bridge.

[0012] In an optional embodiment of the present application, at least one of the size, the radial cross-sectional shape, and the degree of the offset angle of at least one of the auxiliary slots is different from those of the other auxiliary slots.

[0013] In an optional embodiment of the present application, the plurality of auxiliary slots are at least one of continuously offset, V-shaped offset, multi-segment continuously offset, multi-segment V-shaped offset, and sinusoidal offset in the axial direction.

[0014] In an optional embodiment of the present application, the plurality of auxiliary slots are multi-segment continuously offset or multi-segment V-shaped offset in the axial direction.

[0015] The number of the multi-segment offset of the multi-segment continuously offset and / or the multi-segment V-shaped offset is n, and n≥2.

[0016] In an optional embodiment of the present application, the radial cross-sectional shape of the auxiliary slot is at least one of semicircular, trapezoidal, and rectangular.

[0017] In an optional embodiment of the present application, the shape of the magnetic pole slot is one of V-shaped, square-shaped, and double-V-shaped.

[0018] According to a second aspect of the present application, there is provided a permanent magnet synchronous motor, comprising a stator and the rotor of any one of the first aspect.

[0019] The technical solution of the embodiments of the present application can reduce motor cogging torque, correct air gap flux density waveform, improve sine degree of back electromotive force waveform, reduce noise and vibration caused by defects of the motor body, and improve electromagnetic performance of the motor. The solution can also avoid the increase of assembly process caused by the traditional rotor skewing, and does not affect the structural strength of the motor rotor lamination. The position and axial shape of the auxiliary slot have more effects. In some specific positions, not only the noise and vibration performance of the motor can be improved, but also the output of the motor can be increased. It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0021] Figure 1 A structure diagram of a quarter of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0022] Figure 2 A structure diagram of a quarter of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0023] Figure 3 A structure diagram of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0024] Figure 4 A structure diagram of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0025] Figure 5 A structure diagram of a quarter of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0026] Figure 6 A plan view of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0027] Figure 7 A structure diagram of a quarter of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0028] Figure 8 A plan view of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0029] Figure 9 A structure diagram of a quarter of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0030] Figure 10 A back electromotive force waveform diagram of a motor without adding auxiliary slots is provided in the present application.

[0031] Figure 11 A back electromotive force waveform diagram of a motor adding continuous offset auxiliary slots for a rotor of a permanent magnet synchronous motor is provided in the present application.

[0032] Figure 12 A structure diagram of a first perspective view of a rotor for a permanent magnet synchronous motor is provided in the present application.

[0033] Figure 13 AFigure 12 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor;

[0034] Figure 14 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor; Figure 13 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor;

[0035] Figure 15 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor;

[0036] Figure 16 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor; Figure 15 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor;

[0037] Figure 17 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor; Figure 12 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor;

[0038] Figure 18 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor; Figure 12 Provided is a structural diagram of a second perspective view of a rotor for a permanent magnet synchronous motor.

[0039] Wherein, 1, rotor core; 2, magnetic pole slot; 3, permanent magnet; 4, auxiliary slot; 5, first magnetic isolation bridge; 6, second magnetic isolation bridge. DETAILED DESCRIPTION

[0040] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without making creative efforts should belong to the scope of protection of the present application.

[0041] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product, or device.

[0042] In the following examples, THD refers to total harmonic distortion, which refers to the root mean square of the effective value of each harmonic / fundamental value, the greater the value, the higher the harmonic content, the relative noise and vibration of the motor is also larger.

[0043]

[0044] U2, U3..., U n , is the effective value of each harmonic, n≥2; U1 is the effective value of the fundamental.

[0045] Figure 1 A structure schematic diagram of a rotor for a permanent magnet synchronous motor is provided in the first embodiment of the application, and the rotor for the permanent magnet synchronous motor comprises a rotor core 1, a plurality of magnetic pole slots 2 extending along the axial direction are arranged on the rotor core 1, permanent magnets 3 extending along the axial line are arranged in the magnetic pole slots 2, that is, the permanent magnets 3 are parallel to the axial line of the rotor core 3; a plurality of auxiliary slots 4 are arranged on the outer surface of the rotor core 1, the auxiliary slots 4 are independent of the magnetic pole slots 2; the auxiliary slots 4 have an offset angle. The rotor core 1 can be formed by stacking a plurality of silicon steel sheets.

[0046] Among them, the magnetic pole slot 2 refers to the slot for placing the permanent magnet 3, according to the different rotor structures, the magnetic pole slot 2 can be in a plurality of different forms, for example, the magnetic pole slot 2 can be a square slot or a V-shaped slot, as shown in Figure 1 , which is a V-shaped slot. The permanent magnet 3 refers to a magnet capable of maintaining its magnetism for a long time, and the permanent magnet 3 is a hard magnet and is not easy to lose magnetism or be magnetized.

[0047] The mutual independence of the auxiliary slot 4 and the magnetic pole slot 2 means that the auxiliary slot 4 and the magnetic pole slot 2 are not connected. In order to reduce the leakage of the permanent magnet 3, some related technologies use the following scheme: a plurality of permanent magnets in the rotor extend parallel to the rotation axis (X) of the rotor, and a plurality of outwardly open grooves are formed on the outer periphery of the rotor in the region of the radially outer longitudinal edge of the permanent magnet 3, the grooves are respectively inclined or curved relative to the longitudinal edge of the adjacent permanent magnet 3 in the circumferential direction, the center line of each groove intersects the longitudinal edge of the adjacent permanent magnet 3 at least once, the width of the groove on the outer side of the rotor in the circumferential direction is smaller than the width of the groove in the region further radially inward, and the cross-sectional shape of the groove is constant over the length of the rotor. However, in order to form an open groove, the position of the groove after being opened can only be near the magnetic bridge, which can completely disconnect one of the magnetic bridges and reduce the leakage of the permanent magnet 3. This scheme undoubtedly disconnects one magnetic bridge, sacrifices the structural strength to meet the performance of the motor, and the position interval of the opened groove is single. The open groove will bring a large power loss, although the leakage of the permanent magnet can be reduced, but the overall power will not be improved. The scheme can make the auxiliary slot 4 and the magnetic pole slot 2 independent of each other, without sacrificing the structural strength, the position and axial shape of the auxiliary slot 4 are more selected, and in some specific positions, the motor noise and vibration performance can be improved, and the motor power can be improved or not reduced.

[0048] Wherein, the offset angle refers to the included angle of the axial offset of the auxiliary slot 4, for example, θ in the formula. Figure 1 The rotor core 1 is usually composed of a plurality of silicon steel sheets. When there is no offset angle θ in the axial direction of the auxiliary slot 4, the magnetic circuit reluctance of each silicon steel sheet is the same when the rotor core 1 does not rotate, based on the outer circle of the rotor core 1. However, when there is an offset angle in the auxiliary slot 4 between the silicon steel sheets, the magnetic circuit reluctance of each silicon steel sheet on the outer circle of the rotor core 1 is not the same. This forms the effect of rotor skew. Under a certain offset angle, the change of the magnetic circuit reluctance when the rotor rotates can be weakened to reduce the cogging torque, weaken the air gap harmonics, correct the sine degree of the air gap flux density, reduce the THD value, and thus reduce the noise and vibration of the motor.

[0049] The above scheme can reduce the cogging torque of the motor, correct the air gap flux density waveform, improve the sine degree of the back electromotive force waveform, reduce the noise and vibration caused by defects of the motor body, and improve the electromagnetic performance of the motor. At the same time, it can avoid the process increase caused by the traditional rotor skew, and can achieve the effect of more position and axial shape selection of the auxiliary slot 4 without sacrificing the structural strength.

[0050] In an alternative embodiment of the present application, the shape of the pole slot 2 is one of V-shaped, square-shaped, double-V-shaped, and any of the shapes of the pole slot of an embedded rotor structure.

[0051] In an alternative embodiment of the present application, the auxiliary slot 4 is arranged on the outer surface area of the rotor core 1 opposite to the permanent magnet 3. In this way, compared with arranging the auxiliary slot 4 on the outer surface area of the rotor core 1 between two adjacent permanent magnets 3, the auxiliary slot 4 has less impact on the structural strength of the rotor.

[0052] On the basis of the above-mentioned embodiments, as shown in Figure 1 and Figure 2 , the number of the auxiliary slots 4 arranged on the outer surface area of the rotor core 1 opposite to each permanent magnet 3 is one or more.

[0053] When the number of the auxiliary slots 4 is one or more, the rotor skew effect can be achieved. At a certain skew angle, the change of the magnetic resistance of the magnetic circuit during the rotation of the rotor can be weakened, the cogging torque can be reduced, the air gap harmonic can be weakened, the sinusoidal degree of the air gap flux density can be corrected, the THD value can be reduced, and thus the noise and vibration of the motor can be reduced.

[0054] For example, the number of the auxiliary slots 4 arranged on the outer surface area of the rotor core 1 opposite to each permanent magnet 3 is one or two.

[0055] In an alternative embodiment of the present application, as shown in Figure 3 and Figure 4 , at least one of the size, the radial cross-sectional shape, and the degree of the skew angle of at least one auxiliary slot 4 is different from those of the other auxiliary slots 4.

[0056] In the scheme, by digging auxiliary grooves 4 with different sizes or different axial inclination angles on the surface, the magnetic circuit reluctance under some or more magnetic poles is different from that under other magnetic poles, and the design effect of the unequal pole arc magnetic pole can be achieved by optimizing the groove type or inclination angle of the auxiliary grooves 4. That is, the introduction of the auxiliary grooves 4 will weaken the harmonics and also generate new harmonics, and the influence of different sizes and offset angles on the harmonics is different, so when the size or offset angle θ of the auxiliary grooves 4 under some specific magnetic poles is different from that under other magnetic poles, the harmonics can be used to cancel the harmonics, which forms the design effect of the large and small magnetic poles. When the size or offset angle of the auxiliary grooves 4 under some specific magnetic poles is within a reasonable range, the noise and vibration of the motor can be well improved. Therefore, by making at least one of the size, radial cross-sectional shape, and degree of offset angle of at least one auxiliary groove 4 different from those of other auxiliary grooves 4, the design effect of the large and small magnetic poles can be achieved, and the noise and vibration of the motor can be improved.

[0057] For example, in a specific embodiment, as shown in Figure 3 , the radial cross-sectional shape and the degree of offset angle of the auxiliary grooves 4 are consistent, but the size of one auxiliary groove 4 is different from that of other auxiliary grooves 4. In a specific embodiment, as shown in Figure 4 , the size and the radial cross-sectional shape of the auxiliary grooves 4 are consistent, but the offset angle of one auxiliary groove 4 is different from that of other auxiliary grooves 4. According to different use requirements, the radial cross-sectional shape of the auxiliary grooves 4, the size of the auxiliary grooves 4, and the degree of offset angle can be different from those in the above examples, which are only used for illustration. As long as at least one of the size, radial cross-sectional shape, and degree of offset angle of at least one auxiliary groove 4 is different from that of other auxiliary grooves 4.

[0058] In optional embodiments of the present application, the axial shape of the auxiliary grooves 4 can be selected in various ways. For example, in a specific embodiment, the plurality of auxiliary grooves 4 are at least one of continuously offset, V-shaped offset, multi-segment continuously offset, multi-segment V-shaped offset, and sinusoidal offset in the axial direction.

[0059] As shown in Figure 1 , the continuously offset means that the offset angle of each segment of the auxiliary grooves 4 in the axial direction is the same. As shown in Figure 5 and Figure 6 , the V-shaped offset means that the shape of the auxiliary grooves 4 in the axial direction is V-shaped. As shown in Figure 7 , the multi-segment continuously offset means that for the same axial length, there are multiple segments with the same offset angle. As shown in Figure 8 , the multi-segment V-shaped offset means that the shape of the auxiliary grooves 4 in the axial direction is a plurality of V-shaped segments connected together. As shown in Figure 9As shown, the sinusoidal offset refers to the sinusoidal shape of the auxiliary slot 4 along the axial direction.

[0060] In an optional embodiment of the present application, as shown in Figure 7 and Figure 8 As shown, the plurality of auxiliary slots 4 are continuously offset or V-shaped offset along the axial direction; the number of the plurality of auxiliary slots 4 is n, n≥2.

[0061] In an optional embodiment of the present application, the cross-sectional shape of the auxiliary slot 4 along the radial direction is at least one of semicircular, trapezoidal and rectangular.

[0062] When the axial shape of the auxiliary slot 4 is selected and the cross-sectional shape along the radial direction is any of the above, the auxiliary slot 4 has an offset angle, so that the motor slot torque can be reduced, the air gap magnetic flux waveform can be corrected, the sine degree of the back electromotive force waveform can be improved, the noise and vibration caused by the motor body defects can be reduced, and the electromagnetic performance of the motor can be improved. At the same time, the process increase caused by the traditional rotor skew pole can be avoided, and the position of the auxiliary slot 4 and the axial shape selection have more effects without sacrificing the structural strength.

[0063] In a specific embodiment, taking a 12-slot 8-pole motor as an example, Figure 10 is the back electromotive force waveform diagram of the motor without adding the auxiliary slot 4, Figure 11 is the back electromotive force waveform diagram of the motor after adding the continuously offset auxiliary slot 4, which can be seen that after adding the continuously offset auxiliary slot 4, the sine degree of the back electromotive force waveform is significantly improved, the noise and vibration caused by the motor body defects are reduced, and the electromagnetic performance of the motor is improved.

[0064] In the permanent magnet motor, in order not to make the leakage coefficient of the permanent magnet 3 too large and cause the utilization rate of the permanent magnet 3 to be too low, a magnetic isolation measure is taken: the silicon steel sheet is used to isolate the two permanent magnets 3, and the silicon steel sheet between the two permanent magnets 3 is called a magnetic isolation bridge. Since the permanent magnet 3 is arranged in the magnetic pole slot 2, in order to reduce the leakage of the permanent magnet 3, the part of the rotor core 1 between the magnetic pole slot 2 and the outer surface of the rotor core 1 will form a first magnetic isolation bridge 5. As shown in Figures 12-16 When the distance between the auxiliary slot 4 and the magnetic pole slot 2 is small, the part of the rotor core 1 between the auxiliary slot 4 and the magnetic pole slot 2 will form a second magnetic isolation bridge 6.

[0065] As shown in Figures 12-14 The magnetic pole slot 2 is V-shaped, each of the permanent magnets 3 is provided with an auxiliary slot 4 on the area of the outer surface of the rotor core 1, the part of the rotor core 1 between the magnetic pole slot 2 and the outer surface of the rotor core 1 forms the first magnetic isolation bridge 5, and the auxiliary slot 4 and the magnetic pole slot 2 form the second magnetic isolation bridge 6. As shown in Figures 15-16As shown, the magnetic pole slot 2 is square, and the portion of the rotor core 1 between the magnetic pole slot 2 and the outer surface of the rotor core 1 forms a first magnetic isolation bridge 5; the auxiliary slot 4 and the magnetic pole slot 2 form a second magnetic isolation bridge 6. Depending on the structure of the auxiliary slot 4 and the magnetic pole slot 2, the shape and size of the second magnetic isolation bridge 6 will also be different. Here, we will not impose more specific limitations on the structure of the auxiliary slot 4 and the magnetic pole slot 2, as long as the second magnetic isolation bridge 6 can be formed.

[0066] In a preferred embodiment, the first magnetic isolation bridge 5 and the second magnetic isolation bridge 6 satisfy: h1≦h2≦1.5h1, h1≦w2≦w1, where h1 is the thickness of the first magnetic isolation bridge 5, h2 is the thickness of the second magnetic isolation bridge 6, w1 is the length of the first magnetic isolation bridge 5, and w2 is the length of the second magnetic isolation bridge 6.

[0067] In one specific embodiment, the rotor structure is as follows: Figure 12 The motor shown is used as an example for testing. The results of measuring the motor's THD and torque are detailed in [link to test]. Figure 17 and 18 . Figure 17 and Figure 18 In all embodiments, the first magnetic isolation bridge 5 has the same structure and dimensions: h1 = 0.9 mm, w1 = 3.9 mm; the auxiliary grooves 4 are all continuously offset, and their offset angle is 3.75°. Their only difference lies in the dimensions of the second magnetic isolation bridge 5, specifically: Figure 17 The length W2 of the second magnetic isolation bridge 6 in each embodiment is 3.9m, the difference lies in the thickness h2 of the second magnetic isolation bridge 6. Figure 18 In all embodiments, the thickness h2 of the second magnetic isolation bridge 6 is 0.9 μm; the difference lies in the length W2 of the second magnetic isolation bridge 6. From Figure 17 As can be seen, the output decreases as h2 increases. A better THD value can be obtained when h2 = 0.7~1.5mm. To minimize the reduction in the structural strength and output of the rotor core 11, h2 = 0.9~1.35mm is preferable. And from... Figure 18 As can be seen, the output power will decrease as w2 increases. Therefore, when h1≦h2≦1.5h1 and h1≦w2≦w1, the second magnetic isolation bridge 6 can maintain the overall rigid connection of the rotor core 1 while weakening the leakage flux of the permanent magnet 3, thereby increasing the motor output power. The reasonable offset angle and arc surface design of the auxiliary slot 4 can reduce the noise and vibration of the motor.

[0068] The present invention also discloses a permanent magnet synchronous motor, which includes a stator and a rotor according to any embodiment of the present invention.

[0069] Wherein, by setting multiple auxiliary grooves 4 on the outer surface of the rotor core 1, and making the auxiliary grooves 4 independent of the magnetic pole grooves 2 and making the auxiliary grooves 4 have an offset angle, the motor tooth slot torque can be reduced, the air gap magnetic density waveform can be corrected, the sine degree of the back electromotive force waveform can be improved, the noise and vibration caused by the motor body defects can be reduced, and the electromagnetic performance of the motor can be improved. At the same time, the process increase caused by the traditional rotor skew pole can be avoided, and the position and axial shape of the auxiliary grooves 4 can be selected more effectively without sacrificing the structural strength. Therefore, the noise and vibration of the permanent magnet synchronous motor are small, and the electromagnetic performance is good.

[0070] It should be noted that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A rotor for a permanent magnet synchronous motor, comprising a rotor core (1), a plurality of axial extending pole slots (2) are provided on the rotor core (1), and an axial extending permanent magnet (3) is provided in the pole slot (2); characterized in that, The outer surface of the rotor core (1) is provided with a plurality of auxiliary slots (4), which are independent of the magnetic pole slots (2); The auxiliary slots (4) have an offset angle; The part of the rotor core (1) between the magnetic pole slots (2) and the outer surface of the rotor core (1) forms a first magnetic isolation bridge (5); The second magnetic isolation bridge (6) is formed between the auxiliary slots (4) and the magnetic pole slots (2); The first magnetic isolation bridge (5) and the second magnetic isolation bridge (6) satisfy: h1≦h2≦1.5h1, h1≦w2≦w1, wherein h1 is the thickness of the first magnetic isolation bridge (5), h2 is the thickness of the second magnetic isolation bridge (6), w1 is the length of the first magnetic isolation bridge (5), and w2 is the length of the second magnetic isolation bridge (6).

2. The rotor for a permanent magnet synchronous motor according to claim 1, characterized by, The auxiliary slots (4) are arranged on the outer surface area of the rotor core (1) opposite to the permanent magnets (3).

3. The rotor for a permanent magnet synchronous motor according to claim 2, characterized by, The number of auxiliary slots (4) on the outer surface area of the rotor core (1) opposite to each permanent magnet (3) is one or more.

4. Rotor for a permanent magnet synchronous electric machine according to any one of claims 1 to 3, characterized in that, At least one of the size, the radial cross-sectional shape, and the degree of the offset angle of at least one auxiliary slot (4) is different from those of the other auxiliary slots (4).

5. The rotor for a permanent magnet synchronous motor according to any one of claims 1 to 3, characterized by, The plurality of auxiliary slots (4) are at least one of continuously offset, V-shaped offset, multi-segment continuous offset, multi-segment V-shaped offset, and sinusoidal offset in the axial direction.

6. The rotor for a permanent magnet synchronous motor according to any one of claims 1 to 3, characterized by, The plurality of auxiliary slots (4) are multi-segment continuous offset or multi-segment V-shaped offset in the axial direction. The number of multi-segment offset of the multi-segment continuous offset and / or the multi-segment V-shaped offset is n, and n≥2.

7. The rotor for a permanent magnet synchronous motor according to any one of claims 1 to 3, characterized by, The radial cross-sectional shape of the auxiliary slots (4) is at least one of semicircular, trapezoidal, and rectangular.

8. The rotor for a permanent magnet synchronous motor according to any one of claims 1 to 3, characterized by, The shape of the magnetic pole slots (2) is one of V-shaped, square-shaped, and double-V-shaped.

9. A permanent magnet synchronous motor, characterized by, A stator and a rotor according to any one of claims 1-8.

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