Self-starting synchronous reluctance motor rotor and motor

Abstract

The application provides a self-starting synchronous reluctance motor rotor and a motor, the self-starting synchronous reluctance motor rotor comprising a plurality of rotor laminations, the rotor laminations being provided with slotting grooves, filling grooves and shaft holes, wherein the slotting grooves comprise first slotting grooves and second slotting grooves, the first slotting grooves are arranged in the same layer as the filling grooves, and each first slotting groove is provided with a filling groove at each end, the second slotting grooves are located at the outermost circumference of the q-axis of the rotor, and no filling groove is arranged at the two ends of the second slotting grooves; and the width D of each slotting groove in the d-axis direction gradually decreases from the center of the rotor to the outer circumference of the rotor; and the relationship between the width D5 of the second slotting groove in the d-axis direction and the diameter d of the rotor lamination satisfies 0.2*d<=D5<=0.4*d. According to the application, the filling groove structure can be optimized, the motor tooth slot effect can be reduced, the motor magnetic field harmonic can be improved, the torque ripple rate and vibration noise problem of the motor can be improved, and the reliability of the motor operation can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a self-starting synchronous reluctance motor rotor and electric machine. BACKGROUND

[0002] The self-starting synchronous reluctance motor combines the structural features of induction motors and reluctance motors, generates torque through a squirrel cage to start, and generates reluctance torque through a rotor inductance difference to achieve constant speed operation, and can directly connect to a power source to start and operate. Compared with an asynchronous starting permanent magnet motor, the self-starting synchronous reluctance motor does not use rare earth permanent magnet materials and does not have demagnetization problems, has low motor cost, and good reliability.

[0003] However, the self-starting reluctance motor rotor has many filling slots and slot grooves, and the distribution is not reasonable, which greatly affects the motor efficiency and overload capacity, and also easily causes large motor magnetic field harmonics, resulting in noise problems. Moreover, the multi-layer slot groove structure makes the motor rotor weak in strength and prone to deformation during manufacturing.

[0004] In the prior art, the radial slot structure in patent CN 1255925C is not conducive to increasing the dq-axis inductance difference of the motor, the rotor space utilization is insufficient, the motor output torque is small, and the motor efficiency and overload capacity are low. In patent CN207320974U, an asymmetric rotor structure is used to suppress or reduce electromagnetic noise and electromagnetic vibration caused by torque pulsation of the reluctance motor. However, the asymmetric rotor structure also introduces new harmonics, which may increase electromagnetic vibration noise and have little effect.

[0005] Therefore, the present application provides a self-starting synchronous reluctance motor rotor and electric machine to overcome the defects of the prior art, such as large motor magnetic field harmonics and large noise. SUMMARY

[0006] Therefore, the present application provides a self-starting synchronous reluctance motor rotor and electric machine to overcome the defects of the prior art, such as large motor magnetic field harmonics and large noise.

[0007] To solve the above problems, the present application provides a self-starting synchronous reluctance motor rotor, which includes a plurality of rotor laminations, the rotor laminations are provided with slot grooves, filling slots and shaft holes, wherein the slot grooves include first slot grooves and second slot grooves, the first slot grooves are arranged in the same layer as the filling slots, and each first slot groove has two ends corresponding to the filling slots, the second slot grooves are located at the outermost circumference of the rotor q-axis, and the two ends of the second slot grooves are not provided with filling slots; and in the direction from the center of the rotor to the outer circumference of the rotor, the width D of each slot groove in the d-axis direction gradually decreases.

[0008] The width D5 of the second slot in the d-axis direction satisfies the relationship with the diameter d of the rotor lamination: 0.2*d≤D5≤0.4*d.

[0009] In some embodiments, the width D5 of the second slot in the d-axis direction satisfies the relationship with the width D1 of the first slot in the d-axis direction closest to the shaft hole: 0.35≤D5 / D1≤0.6.

[0010] In some embodiments, the filling slots extend in the d-axis direction, the angle deviation between the extension direction of each filling slot and the d-axis is not more than 5%, and the width M of each filling slot in the d-axis direction gradually decreases in the direction away from the d-axis or the width of at least three layers of the filling slots in the d-axis direction continuously decreases.

[0011] In some embodiments, the second slot is a single slot or is composed of multiple small slots, and the extension direction of the second slot is parallel to the d-axis.

[0012] In some embodiments, the included angle α between the two ends of the second slot and the center line of the rotor satisfies 20°≤α≤60°; and / or,

[0013] The ratio between the distance Lr from the second slot to the center of the rotor and the rotor radius R satisfies 0.82≤Lr / R≤0.96.

[0014] In some embodiments, the ratio between the thickness K of the second slot in the q-axis and the thickness K1 of the first slot adjacent to the second slot in the q-axis satisfies 1.2<K / K1≤2.5; and / or, the ratio between the thickness K of the second slot in the q-axis and the thickness K2 of the magnetic flux guide adjacent to the second slot in the q-axis satisfies 0.8<K / K2≤1.6.

[0015] In some embodiments, the ratio between the sum Kn of the thicknesses of all the slots in the q-axis and the distance Kr from the outer circle to the inner circle of the rotor satisfies 0.2*Kr≤Kn / Kr≤0.5*Kr.

[0016] In some embodiments, the second slot, the first slot, and the filling slots collectively form a magnetic barrier layer, and the magnetic barrier layer under one pole is at least two layers.

[0017] In some embodiments, the first slot and the filling slot in the same layer are separated by a separation rib, and in the first quadrant formed by the q-axis and the d-axis, the distance relationship between the center of the separation rib and the d-axis and the q-axis of the rotor respectively satisfies Wq=-ν*Wd+λ, Wq is the distance from the center of the separation rib to the q-axis, Wd is the distance from the center of the separation rib to the d-axis, the coefficient ν satisfies 0.28≤ν≤0.46, and the coefficient λ satisfies 28≤λ≤33.

[0018] In some embodiments, the first slot is separated from the filling slot in the same layer by a partitioning rib, the minimum width L of the partitioning rib is greater than or equal to 0.5*σ, and σ is the air gap width between the stator and the rotor; the partitioning rib is of equal width or of unequal width.

[0019] In some embodiments, in each filling slot, the ratio τ between the maximum thickness and the minimum thickness of the filling slot along the q-axis direction satisfies 1≤τ≤2; and / or, the thickness H of each filling slot along the q-axis direction gradually decreases away from the d-axis direction.

[0020] In some embodiments, a reinforcing rib is arranged between the filling slot or the second slot and the outer circle of the rotor, the width L1 of the reinforcing rib satisfies 0≤L1<2.5σ, and σ is the air gap width between the stator and the rotor.

[0021] In some embodiments, the slot is composed of arc segments and / or straight line segments, from the side of the shaft hole of the rotor to the side of the outer circle of the rotor, the arc of the arc segment of the slot gradually increases, the outermost slot is a straight line, and the arc of the outer circle of the slot is greater than the arc of the inner circle of the slot in the same layer; the arc segment of the slot protrudes towards the side away from the shaft hole; in the two slots closest to the shaft hole, the ratio of the distance K6 between the two sides of the slots closest to the shaft hole on the q-axis and the diameter of the shaft hole is greater than 1.2.

[0022] In some embodiments, the width of the slot gradually increases or remains unchanged along the d-axis direction from the position intersecting with the q-axis to both sides, i.e., K1≤K3; the width of the slot is defined as the shortest distance from each point on one side of the slot to the other side, K1 is the width of the slot at the position intersecting with the q-axis, and K3 is the width of the slot at the position of the two ends.

[0023] In some embodiments, a magnetic flux guiding channel is formed between two adjacent slots, and the width of the magnetic flux guiding channel gradually increases along the d-axis direction from the position intersecting with the q-axis to both sides; the width of the magnetic flux guiding channel is defined as the shortest distance from each point on one side of the channel to the other side.

[0024] In some embodiments, the minimum width K4 of the magnetic flux guiding channel between the slots is less than or equal to the minimum width K5 of the magnetic flux guiding channel between the filling slots at the two ends of the slot, i.e., K4≤K5.

[0025] In some embodiments, the distribution of the plurality of slots is symmetrically distributed with respect to the D-axis or the Q-axis; the distribution of the plurality of filling slots is symmetrically distributed with respect to the D-axis or the Q-axis; and / or, the filling slots and the slots are filled with electrically conductive and magnetically non-conductive material, or at least the filling slots are filled with electrically conductive and magnetically non-conductive material and are short-circuited.

[0026] The application also provides an electric machine comprising the synchronous reluctance motor rotor structure, wherein the synchronous reluctance motor rotor structure is the self-starting synchronous reluctance motor rotor of any one of the preceding items.

[0027] The self-starting synchronous reluctance motor rotor and the electric machine provided by the application have the following beneficial effects:

[0028] 1. The application gradually reduces the width D of each slot in the d-axis direction from the center of the rotor to the outer circumference of the rotor, and the width D5 of the second slot in the d-axis direction and the diameter d of the rotor lamination satisfy the relationship: 0.2*d≤D5≤0.4*d, so that the second slot functions as a magnetic resistance, and together with the gradually reduced D in the radial direction, the harmonic magnetic field can be reduced; the application can optimize the filling slot structure, reduce the cogging effect of the electric machine, improve the magnetic field harmonic of the electric machine, and at the same time reduce the deformation of the rotor during manufacturing; the torque ripple rate and vibration noise problem of the electric machine are improved, and the reliability of the electric machine operation is improved; the magnetic field harmonic is effectively reduced, thereby avoiding the torque ripple and vibration noise problem caused by the harmonic;

[0029] 2. The application provides a self-starting synchronous reluctance motor rotor structure, which effectively utilizes the rotor space by reasonably arranging the filling slots and the slot, increases the output torque of the electric machine, and improves the efficiency and overload capacity of the electric machine; the filling slot structure is optimized, the cogging effect of the electric machine is reduced, the magnetic field harmonic of the electric machine is improved, and at the same time the deformation of the rotor during manufacturing is reduced, thereby solving the problems of low efficiency, large magnetic field harmonic, and poor overload capacity of the self-starting reluctance motor;

[0030] 3. The application also limits the size of the partitioning rib, which on the one hand does not weaken the strength of the rotor structure due to the too small size of the partitioning rib, and on the other hand does not increase the magnetic leakage of the electric machine and reduce the efficiency due to the too large size of the partitioning rib; through the structure design of the second rotor lamination and the size design of the partitioning rib between the rotor filling slot and the slot, the mechanical strength of the rotor can also be enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure diagram of the self-starting synchronous reluctance motor rotor lamination of the first embodiment of the application;

[0032] Figure 2 It is a structure diagram of the self-starting synchronous reluctance motor rotor lamination of the second embodiment of the application;

[0033] Figure 3 It is a comparison curve diagram of the rotor structure of the application and the output torque of the prior art.

[0034] Figure 4 It is a comparison curve diagram of the rotor structure of the application and the current waveform of the prior art.

[0035] Reference signs are indicated as:

[0036] 1, rotor lamination; 2, filling slot; 3, slit slot; 31, first slit slot; 32, second slit slot; 4, shaft hole; 5, division rib; 6, reinforcing rib. DETAILED DESCRIPTION

[0037] As Figures 1-4 shown, the application provides a self-starting synchronous reluctance motor rotor, which comprises a plurality of rotor laminations 1, the rotor laminations 1 are provided with slit slots 3, filling slots 2 and shaft holes 4, wherein the slit slots 3 comprise first slit slots 31 and second slit slots 32, the first slit slots 31 are arranged in the same layer as the filling slots 2, and each of the first slit slots 31 is provided with the filling slots 2 at both ends, the second slit slots 32 are located at the outermost circumference of the rotor q-axis, and the filling slots are not provided at both ends of the second slit slots 32, the filling slots 3 and the slit slots 2 jointly form a multi-layer magnetic barrier layer structure of the rotor; and from the center of the rotor to the outer circumference of the rotor, the width D of each slit slot in the d-axis direction gradually decreases.

[0038] The width D5 of the second slit slot 32 in the d-axis direction and the diameter d of the rotor lamination 1 satisfy the relationship: 0.2*d≤D5≤0.4*d; more preferably, 0.25*d≤D5≤0.35*d.

[0039] The application gradually reduces the width D of each slit slot in the d-axis direction from the center of the rotor to the outer circumference of the rotor, and the width D5 of the second slit slot in the d-axis direction and the diameter d of the rotor lamination 1 satisfy the relationship: 0.2*d≤D5≤0.4*d, since the second slit slot plays a role of magnetic resistance, together with the gradually decreasing D in the radial direction outward, the harmonic magnetic field can be reduced; the application can optimize the filling slot structure, reduce the motor tooth slot effect, improve the motor magnetic field harmonic, and at the same time reduce the deformation of the rotor during manufacturing; improve the torque ripple rate and vibration noise problem of the motor, and improve the reliability of the motor operation; by effectively reducing the magnetic field harmonic, the torque ripple and vibration noise problem caused by the harmonic can be avoided.

[0040] The application provides a self-starting reluctance rotor, which is stacked by rotor laminations with a specific structure, as Figure 1The rotor lamination 1 is provided with a plurality of filling grooves 2 and slit grooves 3 and a shaft hole 4 matched with a rotating shaft. The slit grooves 3 are divided into a first slit groove 31 with filling grooves at both ends and a second slit groove 32 (the outermost slit groove) located at the outermost circumferential part of the rotor q-axis. The width (the width between both ends of the slit groove) D of each slit groove gradually decreases in the d-axis direction from the center of the rotor to the outer circumferential part of the rotor. The second slit groove is located at the outermost circumferential part of the rotor q-axis.

[0041] The application provides a self-starting synchronous reluctance motor rotor structure, which solves the problems of low efficiency, large magnetic field harmonic and poor overload capacity of the self-starting reluctance motor.

[0042] 1. The filling grooves and slit grooves are reasonably arranged, the rotor space is effectively utilized, the motor output torque is increased, and the motor efficiency and overload are improved.

[0043] 2. The filling groove structure is optimized, the motor tooth slot effect is reduced, the motor magnetic field harmonic is improved, and the rotor deformation during manufacturing is reduced.

[0044] Further, the relationship between the width D5 of the second slit groove 32 in the d-axis direction and the rotor diameter d satisfies 0.2*d≤D5≤0.4*d; more preferably, 0.25*d≤D5≤0.35*d; the width of the second slit groove is limited to achieve a better harmonic reduction effect.

[0045] In some embodiments, the width D5 of the second slit groove 32 in the d-axis direction and the width D1 of the first slit groove 31 closest to the shaft hole 4 in the d-axis direction satisfy 0.35≤D5 / D1≤0.6; more preferably, 0.4≤D5 / D1≤0.5. Limiting the width of the second slit groove can also reduce the die casting deformation of the rotor.

[0046] In some embodiments, the filling grooves extend along the d-axis direction, the angle deviation between the extension direction of each filling groove and the d-axis is not more than 5%, and the width M of each filling groove in the d-axis direction gradually decreases in the direction away from the d-axis. More preferably, the widths of at least three layers of the filling grooves in the d-axis direction continuously decrease. This feature can reasonably utilize the rotor space according to the magnetic field distribution characteristics of the motor, increase the motor inductance difference, and improve the output torque.

[0047] In some embodiments, the second slit groove 32 (the outermost slit groove) is a single groove or is composed of a plurality of small grooves, and the extension direction of the second slit groove is parallel to the d-axis. Figure 2 As shown in the second embodiment of the application, the second slit groove 32 is composed of a plurality of small grooves, and the extension direction of the second slit groove is generally parallel to the d-axis. The extension directions of the filling grooves and the second slit groove being approximately parallel to the d-axis can reduce the obstruction of the filling grooves to the d-axis magnetic flux, increase the motor inductance difference, and improve the motor efficiency and overload capacity.

[0048] In some embodiments, the included angle a between the two ends of the second slot 32 and the center of the rotor satisfies 20°≤a≤60°. More preferably, a should satisfy 30°≤a≤40°; the second slot as a magnetic barrier can increase q-axis reluctance, reduce q-axis inductance, and increase motor inductance difference. And / or,

[0049] The ratio between the distance Lr between the second slot 32 (the outermost slot) and the center of the rotor and the rotor radius R satisfies 0.82≤Lr / R≤0.96.

[0050] In some embodiments, the ratio between the thickness K of the second slot 32 (the outermost slot) on the q-axis and the thickness K1 of the first slot 31 adjacent to it on the q-axis satisfies 1.2<K / K1≤2.5; and / or, the ratio between the thickness K of the second slot 32 on the q-axis and the thickness K2 of the adjacent magnetic flux channel on the q-axis satisfies 0.8<K / K2≤1.6. The ratio between the thickness K of the second slot 32 (the outermost slot) on the q-axis and the thickness K1 of the adjacent slot on the q-axis satisfies 1.2<K / K1≤2.5; in this way, the appropriate position and thickness of the second slot are ensured to achieve better harmonic reduction effect; as shown in the figure, the harmonic of the motor input current is reduced and the waveform is better. Figure 4 The harmonic of the motor input current is reduced and the waveform is better.

[0051] In some embodiments, the ratio between the sum Kn of the thicknesses of all the slots on the q-axis and the distance Kr between the outer circle and the inner circle of the rotor satisfies 0.2*Kr≤Kn / Kr≤0.5*Kr; more preferably, 0.3*Kr≤Kn / Kr≤0.4*Kr. In this way, the appropriate proportion of the thickness of the slots in the total thickness of the core is ensured to avoid large-scale magnetic field saturation of the core and affect the efficiency of the motor.

[0052] In some embodiments, the second slot 32, the first slot 31 and the filling slot 2 together form a magnetic barrier layer, and there are at least 2 layers of the magnetic barrier layer under one pole. More magnetic barrier layers increase the salient pole difference of the motor, increase the reluctance torque, and improve the efficiency of the motor.

[0053] In some embodiments, the first slot 31 and the filling slot 2 in the same layer are separated by a dividing rib 5, and in the first quadrant formed by the q-axis and the d-axis, the distance relationship between the position of the dividing rib 5 and the d-axis and the q-axis of the rotor respectively satisfies Wq=-ν*Wd+λ, Wq is the distance between the center of the dividing rib 5 and the q-axis, Wd is the distance between the center of the dividing rib 5 and the d-axis, the coefficient v satisfies 0.28≤v≤0.46, and the coefficient λ satisfies 28≤λ≤33. In this way, the dividing ribs are arranged to have appropriate distances between adjacent dividing ribs, which can increase the strength of the rotor.

[0054] In some embodiments, the first slot 31 is separated from the filling slot 2 in the same layer by a partitioning rib 5, the minimum width L of the partitioning rib 5 is greater than or equal to 0.5*σ, and σ is the air gap width between the stator and the rotor; the partitioning rib 5 has an equal width structure or an unequal width structure, such as a trapezoidal structure; the partitioning rib has an equal width structure or an unequal width structure, such as a trapezoidal structure; and the appropriate width of the partitioning rib can ensure the strength and reduce the magnetic field leakage.

[0055] In some embodiments, in each filling slot, the ratio τ between the maximum thickness and the minimum thickness of the filling slot 2 along the q-axis direction satisfies 1≤τ≤2; more preferably, 1.3≤τ≤1.5; and / or the thickness H of each filling slot gradually decreases along the direction away from the d-axis. The thickness of each filling slot should not be too different and gradually decrease along the direction away from the d-axis, which is better for utilizing the rotor space.

[0056] In some embodiments, the filling slot 2 or the second slot 32 is provided with a reinforcing rib 6 between the outer circle of the rotor, and the width L1 of the reinforcing rib 6 satisfies 0≤L1<2.5σ, and σ is the air gap width between the stator and the rotor. The width L1 of the reinforcing rib satisfies 0≤L1<3σ, and σ is the air gap width between the stator and the rotor; a smaller rib width or no rib can increase the motor output torque and improve the overload capacity.

[0057] In some embodiments, the slot 3 is composed of an arc segment and / or a straight line segment, from one side of the shaft hole 4 of the rotor to the outer circle side of the rotor, the arc segment of the slot 3 gradually increases in curvature, the outermost slot 3 is a straight line, and the curvature of the outer circle arc of the slot 3 in the same layer is greater than that of the inner circle arc; the arc segment of the slot 3 protrudes towards the side away from the shaft hole; in the two slots 3 closest to the shaft hole 4, the ratio of the distance K6 between the two sides of the slots 3 closest to the shaft hole 4 on the q-axis to the diameter of the shaft hole 4 is greater than 1.2. In this way, the slot shape can utilize the rotor space as much as possible, increase the motor output torque and efficiency; for example, Figure 3 The output torque curve of the prior art and the present application, the present application not only increases the motor output torque, but also reduces the torque fluctuation.

[0058] In some embodiments, the width of the slot 3 gradually increases or remains unchanged along the direction of the d-axis from the position intersecting the q-axis, that is, K1≤K3; the width of the slot is defined as the shortest distance from each point on one side of the slot to the other side, K1 is the width of the slot 3 at the position intersecting the q-axis, and K3 is the width of the slot 3 at the two ends. In this way, the slot shape can utilize the rotor space as much as possible, increase the motor output torque and efficiency; for example, Figure 3The prior art and the output torque curve of the present application, the present application technology not only increases the motor output torque, but also reduces the torque fluctuation.

[0059] In some embodiments, a magnetic flux channel is formed between two adjacent slit grooves 3, and the width of the magnetic flux channel gradually increases from the position intersecting the q-axis to both sides along the direction of the d-axis (i.e., gradually increases from the center of the q-axis to both sides; i.e., the width of the magnetic flux channel gradually increases from the q-axis to both sides of the q-axis). The width of the magnetic flux channel is defined as the shortest distance from each point on one side of the magnetic flux channel to the other side. The magnetic field flows through the magnetic flux channel, and the gradually widening magnetic flux channel reduces the saturation of the magnetic field

[0060] In some embodiments, the minimum width K4 of the magnetic flux channel between the slit grooves 3 is less than or equal to the minimum width K5 of the magnetic flux channel between the filling grooves 2 at both ends of the slit groove, i.e., K4≤K5; more preferably, K5 / K4 is greater than 1.15. The magnetic field flows through the magnetic flux channel, and in particular, the saturation of the magnetic field in the magnetic flux channel between the filling grooves 2 is reduced, allowing the magnetic flux to effectively enter the air gap.

[0061] In some embodiments, the distribution of the plurality of slit grooves 3 is symmetrically distributed with respect to the D-axis or the Q-axis; and the distribution of the plurality of filling grooves 2 is symmetrically distributed with respect to the D-axis or the Q-axis; and / or, the filling grooves 2 and the slit grooves 3 are filled with electrically conductive and magnetically non-conductive material, or at least the filling grooves 2 are filled with electrically conductive and magnetically non-conductive material and are short-circuited, and the first slit groove can be air, or filled with electrically conductive and magnetically non-conductive material, or filled with other electrically non-conductive and magnetically non-conductive material (such as resin). Figure 2 For the second embodiment of the present application, the filling grooves and the second slit grooves are filled with electrically conductive and magnetically non-conductive material, and the first slit groove is air.

[0062] The present application also provides an electric motor comprising a synchronous reluctance motor rotor structure, wherein the synchronous reluctance motor rotor structure is the self-starting synchronous reluctance motor rotor of any one of the preceding embodiments.

[0063] The present application proposes a self-starting synchronous reluctance motor rotor structure, which effectively utilizes the rotor space by reasonably arranging the filling grooves and the slit grooves, increases the output torque of the motor, improves the efficiency and overload of the motor, optimizes the structure of the filling grooves, reduces the cogging effect of the motor, improves the magnetic field harmonics of the motor, and reduces the deformation during the manufacture of the rotor.

[0064] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-starting synchronous reluctance motor rotor, characterized in that: comprising a plurality of rotor laminations (1), the rotor laminations (1) are provided with slot (3), filling slot (2) and shaft hole (4), wherein the slot (3) comprises first slot (31) and second slot (32), the first slot (31) is arranged in the same layer with the filling slot (2), and the both ends of each first slot (31) are provided with the filling slot (2), the second slot (32) is located at the outermost of the rotor q axis, and the both ends of the second slot (32) are not provided with filling slot; and the width D of each slot in the d axis direction gradually decreases from the center of the rotor to the outer circle of the rotor. The width D5 of the second slot (32) in the d axis direction and the diameter d of the rotor lamination (1) satisfy the relationship: 0.2*d≤D5≤0.4*d. The width D5 of the second slot (32) in the d axis direction and the width D1 of the first slot (31) closest to the shaft hole (4) in the d axis direction satisfy: 0.35≤D5 / D1≤0.

6. The first slot (31) and the filling slot (2) in the same layer are separated by a dividing rib (5), and in the first quadrant composed of the q axis and the d axis, the distance between the position of the dividing rib (5) and the d axis and q axis of the rotor respectively satisfies Wq=-ν*Wd+λ, Wq is the distance between the center of the dividing rib (5) and the q axis, Wd is the distance between the center of the dividing rib (5) and the d axis, the coefficient ν satisfies 0.28≤ν≤0.46, and the coefficient λ satisfies 28≤λ≤33. 2.The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: the filling slot extends along the d axis direction, the angle deviation between the extension direction of each filling slot and the d axis is not more than 5%, and the width M of each filling slot in the d axis direction gradually decreases or at least three layers of the width of the filling slot in the d axis direction continuously decreases. 3.The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: the second slot (32) is a single slot or is composed of a plurality of small slots, and the extension direction of the second slot is parallel to the d axis. 4.The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: the included angle α between the two ends of the second slot (32) and the center line of the rotor satisfies 20°≤α≤60°; and / or, the ratio between the distance Lr between the second slot (32) and the center of the rotor and the radius R of the rotor satisfies 0.82≤Lr / R≤0.

96. 5.The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: the ratio between the thickness K of the second slot (32) on the q axis and the thickness K1 of the adjacent first slot (31) on the q axis is 1.2<K / K1≤2.5; and / or, the ratio between the thickness K of the second slot (32) on the q axis and the thickness K2 of the adjacent magnetic flux path on the q axis satisfies 0.8<K / K2≤1.

6. ​ ​ ​ ​ ​ ​ 6. The self-starting synchronous reluctance motor rotor of claim 1, wherein: a ratio between a sum Kn of thicknesses of all slot gaps in the q-axis and a distance Kr from an outer circle to an inner circle of the rotor satisfies: 0.2*Kr≤Kn / Kr≤0.5*Kr.

7. The self-starting synchronous reluctance motor rotor of claim 1, wherein: the second slot gap (32), the first slot gap (31), and the filling slot (2) together form a magnetic barrier layer, and a number of the magnetic barrier layers under one pole is at least two.

8. The self-starting synchronous reluctance motor rotor of claim 1, wherein: the first slot gap (31) and the filling slot (2) in the same layer are separated by a separation rib (5), a minimum width L of the separation rib (5) is greater than or equal to 0.5*σ, and σ is an air gap width between the stator and the rotor; and the separation rib (5) has an equal width structure or a non-equal width structure.

9. The self-starting synchronous reluctance motor rotor of claim 1, wherein: in each filling slot, a ratio τ between a maximum thickness and a minimum thickness of the filling slot (2) in the q-axis direction satisfies 1≤τ≤2; and / or, thicknesses H of the filling slots in the q-axis direction gradually decrease away from the d-axis direction.

10. The self-starting synchronous reluctance motor rotor of claim 1, wherein: a reinforcing rib (6) is present between the filling slot (2) or the second slot gap (32) and an outer circle of the rotor, and a width L1 of the reinforcing rib (6) satisfies 0≤L1<2.5σ, and σ is an air gap width between the stator and the rotor.

11. The self-starting synchronous reluctance motor rotor of claim 1, wherein: the slot gap (3) is composed of an arc segment and / or a straight line segment, an arc degree of the arc segment of the slot gap (3) gradually increases from a side of the shaft hole (4) of the rotor to an outer circle side of the rotor, an outermost slot gap (3) is a straight line, and an arc degree of an outer circle arc of the slot gap (3) in the same layer is greater than an arc degree of an inner circle arc; the arc segment of the slot gap (3) protrudes toward a side away from the shaft hole; in two slot gaps (3) closest to the shaft hole (4), a ratio between a distance K6 in the q-axis of a side of each slot gap (3) closest to the shaft hole (4) and a diameter of the shaft hole (4) is greater than 1.

2.

12. The self-starting synchronous reluctance motor rotor of claim 1, wherein: a width of the slot gap (3) gradually increases or remains unchanged from a position intersecting the q-axis to both sides along the d-axis direction, i.e., K1≤K3; the width of the slot gap is defined as a shortest distance from each point on one side to the other side of the slot gap, K1 is a width of the slot gap (3) at a position intersecting the q-axis, and K3 is a width of the slot gap (3) at both end positions.

13. The self-starting synchronous reluctance motor rotor of claim 1, wherein: The magnetic flux guide channel is formed between two adjacent slit grooves (3), and the width of the magnetic flux guide channel gradually increases from the position intersecting with the q-axis to both sides along the direction of the d-axis; the width of the magnetic flux guide channel is defined as the shortest distance from each point on one side of the magnetic flux guide channel to the other side.

14. The self-starting synchronous reluctance machine rotor of any one of claims 1-13, wherein: The minimum width K4 of the magnetic flux guide channel between the slit grooves (3) is less than or equal to the minimum width K5 of the magnetic flux guide channel between the filling grooves (2) at both ends of the slit grooves, i.e. K4≤K5.

15. The self-starting synchronous reluctance machine rotor of any one of claims 1-13, wherein: The distribution of the plurality of slit grooves (3) is symmetrically distributed with respect to the D-axis or the Q-axis, and the distribution of the plurality of filling grooves (2) is symmetrically distributed with respect to the D-axis or the Q-axis; and / or, the filling grooves (2) and the slit grooves (3) are filled with electrically conductive and magnetically non-conductive material, or at least the filling grooves (2) are filled with electrically conductive and magnetically non-conductive material and are short-circuited.

16. An electric machine comprising a synchronous reluctance machine rotor structure, characterized by The synchronous reluctance machine rotor structure is the self-starting synchronous reluctance machine rotor of any one of claims 1 to 15.

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