CN116191728A - Rotor structure and motor - Google Patents

Abstract

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor core, wherein the rotor core is formed by laminating a plurality of rotor punching sheets, a magnetic steel groove extending along the radial direction is formed in the rotor core under one magnetic pole, a permanent magnet is arranged in the magnetic steel groove, slit grooves are respectively formed in the two circumferential sides of the magnetic steel groove, each slit groove comprises a first part extending along the direction perpendicular to a q-axis and a second part extending along the direction of a d-axis, n layers are arranged in the direction of the q-axis, n is more than or equal to 2, the width of the slit groove of the first part along the direction of the q-axis is L0, a shaft hole is formed in the center of the rotor core, the radius of the rotor core is R, and the radius of the shaft hole is (ΣL0)/(R-R) =0.3-0.5. According to the rotor structure, the rotor structure can be optimized, the salient pole ratio of the motor is further improved, and the reluctance torque of the motor is further improved.

Description

Rotor structure and motor

Technical Field

The invention relates to the technical field of motors, in particular to a rotor structure and a motor.

Background

The tangential permanent magnet motor has the characteristics of high power density, high efficiency and high reliability, the permanent magnet of the built-in rotor is placed in the rotor core, binding is not needed, the built-in permanent magnet motor is suitable for occasions of high-speed operation, demagnetization is not easy to generate, the rotor is asymmetric in structure, the salient pole of the motor is relatively large, permanent magnet torque and reluctance torque can be generated simultaneously compared with a surface-mounted permanent magnet motor, the permanent magnet of the tangential permanent magnet motor adopts a tangential magnetizing mode, two adjacent permanent magnets can be output in parallel under one pole distance, the air gap magnetic density is larger than that of the permanent magnets, and the output torque of the motor can be further improved by utilizing the magnetism gathering effect.

However, the current problem faced by the tangential permanent magnet motor is that a means for continuously optimizing the structure is lacking, so that the salient pole ratio of the motor is still limited, the reluctance torque lifting means of the motor is very limited, and the working performance of the hindered motor is further improved.

Disclosure of Invention

The invention mainly aims to provide a rotor structure and a motor, which can optimize the rotor structure and further improve the salient pole ratio of the motor so as to further improve the reluctance torque of the motor.

In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor structure including a rotor core formed by laminating a plurality of rotor punching sheets, a magnetic steel groove extending in a radial direction is provided on the rotor core under one magnetic pole, a permanent magnet is provided in the magnetic steel groove, slit grooves are provided on both circumferential sides of the magnetic steel groove, the slit grooves include a first portion extending in a direction perpendicular to a q-axis and a second portion extending in a d-axis direction, the slit grooves are provided with n layers in the q-axis direction, n is equal to or greater than 2, a width of the slit groove of the first portion in the q-axis direction is L0, a shaft hole is provided at a center of the rotor core, a radius of the rotor core is R, and a radius of the shaft hole is R, (Σl0)/(R-R) =0.3 to 0.5.

Further, the width of each slit groove of the first portion in the q-axis direction is not uniform.

Further, the ratio z between the maximum value and the minimum value of the width of the slit groove of the first portion satisfies 1 < z.ltoreq.2.

Further, the length of the permanent magnet along the q-axis direction is m0, the length of the magnetic steel groove along the q-axis direction is L, (L-m 0)/m0=0.2 to 0.3.

Further, the rotor core is further provided with a separation rib, the separation rib comprises a first separation rib arranged between the magnetic steel groove and the slit groove and a second separation rib arranged between the slit groove and the outer circle of the rotor core, the width of the first separation rib is m1, the width of the second separation rib is m2, m1 is less than 1mm, and m2 is less than 1mm.

Further, m1 is more than or equal to 0.3mm and less than or equal to 0.5mm, m2 is more than or equal to 0.3mm and less than or equal to 0.5mm.

Further, a separation rib is further arranged on the rotor core, the separation rib comprises a second separation rib positioned between the slit groove and the outer circle of the rotor core, the width of the second separation rib is m2, the arc length of the second separation rib is L4, and L4/m2=5-9.

Further, a separation rib is further arranged on the rotor core, the separation rib comprises a first separation rib arranged between the magnetic steel groove and the slit groove, the width of the first separation rib is m1, and the width of the magnetic steel groove along the direction perpendicular to the q axis is b, wherein m 1/b=0.05-0.1.

Further, a separation rib is further arranged on the rotor core, the separation rib comprises a first separation rib positioned between the magnetic steel groove and the slit groove, and the width of the first separation rib is m1, and L0/m1=3-6.

Further, the lengths of the first parts in the direction from the outer circle of the rotor core to the shaft hole are sequentially increased, the connecting line of the radially outermost edge and the radially innermost edge of the first part on the first side of the magnetic steel groove is a first connecting line, the connecting line of the radially outermost edge and the radially innermost edge of the first part on the second side of the magnetic steel groove is a second connecting line, and an included angle between the first connecting line and the second connecting line is alpha, wherein alpha is more than or equal to 60 degrees.

Further, in the q-axis direction, the minimum interval between adjacent slit grooves is L1, L1 > L0.

Further, l1/l0=1.4 to 1.5.

Further, the distance between the slit groove of the first portion located at the outermost side of the rotor core and the outer circumference of the rotor core is the minimum value of the interval distance of the slit groove of the first portion in the q-axis direction.

Further, the slit groove of the second portion has a width L2 in a direction perpendicular to the d-axis, and l2/l0=0.9 to 1.1.

Further, slit grooves of the second portion are unevenly distributed along a direction perpendicular to the d-axis, and the distance between the slit grooves is unevenly distributed along a direction from a side close to the permanent magnet to a side far from the permanent magnet.

Further, the included angle between the slit groove of the first part and the slit groove of the second part is beta, and the beta is 145 degrees less than or equal to 180 degrees.

Further, the number of layers of the slit groove of the first portion and the slit groove of the second portion are the same.

Further, the length of the magnetic steel groove along the q-axis direction is L, and L/(R-R) =0.8-0.9.

Further, the length of the magnetic steel groove along the q-axis direction is L, and L/(ΣL0) is more than or equal to 2.

Further, the gap between the magnetic steel groove and the permanent magnet is filled with non-magnetic permeability substances.

Further, the magnetizing direction of the permanent magnet is tangential, and the permanent magnet is rectangular in shape.

Further, the permanent magnet includes a plurality of segments arranged at intervals along the q-axis direction.

Further, the width of the interval section between the adjacent blocks is L5, and L5 is larger than or equal to the width L0 of the slit grooves at two sides of the interval section.

Further, the length of the segment in the q-axis direction is less than or equal to the minimum spacing L1 between adjacent slit grooves on both sides of the segment.

Further, the spacing segments between adjacent segments are placed opposite to the slit grooves or staggered by a preset distance.

Further, the permanent magnet is of unitary construction.

Further, in a section perpendicular to the central axis of the rotor core, the shaft hole is formed of a plurality of curved lines or a combination of curved lines and straight lines, and a distance between the center and the outer edge of the shaft hole is greater than or equal to the radius r.

According to another aspect of the present invention there is provided an electrical machine comprising a stator structure and a rotor structure as described above, the rotor structure forming an air gap therebetween.

By applying the technical scheme of the invention, the rotor structure comprises a rotor iron core, the rotor iron core is formed by laminating a plurality of rotor punching sheets, a magnetic steel groove extending along the radial direction is formed in the rotor iron core under one magnetic pole, a permanent magnet is arranged in the magnetic steel groove, slit grooves are respectively formed in the two circumferential sides of the magnetic steel groove, each slit groove comprises a first part extending along the direction vertical to a q-axis and a second part extending along a d-axis, n layers are arranged in the q-axis direction of each slit groove, n is more than or equal to 2, the width of each slit groove of the first part along the q-axis direction is L0, a shaft hole is formed in the center of the rotor iron core, the radius of the rotor iron core is R, and the radius of the shaft hole is R, (ΣL0)/(R-R) =0.3-0.5. The rotor structure is characterized in that slit grooves are respectively formed in two circumferential sides of a permanent magnet, permanent magnet torque is formed by the permanent magnet, reluctance torque is formed by the slit grooves, and the permanent magnet torque and the reluctance torque are simultaneously guaranteed to be provided for the motor, so that output torque of the motor is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 shows a schematic structural view of a rotor structure of an embodiment of the present invention;

FIG. 2 shows an enlarged block diagram of one pole of a rotor structure of an embodiment of the present invention; and

fig. 3 shows a schematic structural view of a rotor structure of another embodiment of the present invention.

Wherein the above figures include the following reference numerals:

1. a rotor core; 2. rotor punching; 3. a magnetic steel groove; 4. slit grooves; 41. a first portion; 42. a second portion; 5. a shaft hole; 6. a separation rib; 61. a first separator rib; 62. second separating ribs; 7. a permanent magnet; 71. partitioning; 72. a spacer section.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 3, according to an embodiment of the present invention, a rotor structure includes a rotor core 1, the rotor core 1 is formed by laminating a plurality of rotor punching sheets 2, a magnetic steel groove 3 extending in a radial direction is formed in the rotor core 1 under one magnetic pole, a permanent magnet 7 is provided in the magnetic steel groove 3, slit grooves 4 are respectively formed in both circumferential sides of the magnetic steel groove 3, the slit grooves 4 include a first portion 41 extending in a direction perpendicular to a q-axis and a second portion 42 extending in a d-axis direction, n layers are provided in the q-axis direction in the slit grooves 4, n is equal to or greater than 2, a width of the slit grooves 4 of the first portion 41 in the q-axis direction is L0, a shaft hole 5 is formed in a center of the rotor core 1, a radius of the rotor core 1 is R, and a radius of the shaft hole 5 is R, (Σl0)/(R-R) =0.3 to 0.5.

According to the rotor structure, slit grooves 4 are respectively formed in two circumferential sides of a permanent magnet 7, permanent magnet torque is formed by the permanent magnet 7, reluctance torque is formed by the slit grooves 4, and the motor is guaranteed to have permanent magnet torque and reluctance torque at the same time, so that output torque of the motor is improved, meanwhile, the ratio of the slit grooves 4 distributed along the q-axis direction between the inner edge and the outer edge of a rotor core 1 is reasonable by limiting the proportional relation between the sum sigma L0 of the widths of the slit grooves 4 along the q-axis direction and the difference R-R of the inner hole radius and the outer hole radius of the rotor core, the trend of a magnetic circuit is guaranteed to be reasonable, and magnetic force lines form a closed loop through the rotor core, so that the rotor structure is optimized, the salient pole ratio of the motor is increased, the magnetic leakage is reduced, the reluctance torque of the motor is increased, and the output torque of the motor is further increased.

In one embodiment, the magnetic steel grooves 3 and the slit grooves 4 are uniformly distributed in the circumferential direction along the central axis of the rotor core 1, and the number of poles of the motor is not less than 6 poles.

In one embodiment, the slit grooves 4 of the second portion 42 are unevenly distributed in the direction perpendicular to the d-axis from the side close to the permanent magnet 7 to the side away from the permanent magnet 7.

In one embodiment, the slit grooves 4 of the first portion 41 are arranged at a non-uniform interval in the q-axis direction from the side near the shaft hole 5 to the side of the shaft hole 5.

In one embodiment, the distance between the slit groove 4 of the first portion 41 located at the outermost side of the rotor core 1 and the outer circumference of the rotor core 1 is the minimum value of the interval distance of the slit groove 4 of the first portion 41 in the q-axis direction.

The width between the adjacent slit grooves 4 is the width of the magnetic conduction channel, the smaller the number of magnetic lines which can pass, the easier saturation of the magnetic circuit, the longer the path of the magnetic conduction channel, the larger the magnetic resistance, the lower the passing efficiency of the magnetic lines, the closer to the outer circle of the rotor, the shorter the path of the magnetic conduction channel, the smaller the magnetic resistance, the higher the passing efficiency of the magnetic lines, in order to ensure the consistency of the magnetic lines, the closer to the outer circle of the rotor, the smaller the width, the length and the width of the magnetic conduction channel can be matched by utilizing the width adjustment of the magnetic conduction channel, the better the passing quantity balance of the magnetic lines of each magnetic conduction channel, and the sum of the magnetic resistance torque and the permanent magnet torque can reach a higher level, so that the total torque of the motor can be improved, and the torque output of the motor can be improved.

In one embodiment, the ratio z between the maximum value and the minimum value of the width of the slit groove 4 satisfies 1 < z.ltoreq.2.

Through the limitation, the structure and the setting position of the slit groove 4 can be optimized, the position of the slit groove 4 on the rotor core 1 and the area of the slit groove 4 accounting for the rotor core 1 are more effectively ensured, the d-axis magnetic circuit and the q-axis magnetic circuit of the rotor core 1 of the motor are in an asymmetric structure, the salient pole ratio of the motor is increased, the reluctance torque is improved, and the motor output torque is increased under the condition that the dosage of the permanent magnet 7 is not changed.

In one embodiment, the width of each slit groove 4 of the first portion 41 in the q-axis direction is not uniform. The width of the slit groove is ensured to be unequal, the asymmetry of the d axis and the q axis of the rotor is increased, the salient pole ratio of the motor is improved, and the reluctance torque of the motor can be increased.

In one embodiment, the length of the permanent magnet 7 in the q-axis direction is m0, the length of the magnetic steel groove 3 in the q-axis direction is L, (L-m 0)/m0=0.2 to 0.3. Here, the length of the permanent magnet 7 in the q-axis direction being m0 means a distance between an edge of the permanent magnet 7 on the side close to the rotor outer circumference and an edge of the permanent magnet 7 on the side close to the shaft hole 5.

The length L of the magnetic steel groove 3 along the q-axis direction is the distance between the edge of the magnetic steel groove 3 close to the excircle of the rotor and the edge of the magnetic steel groove 3 close to the shaft hole 5.

In this embodiment, by controlling the relationship between the gap width between the magnetic steel groove 3 and the permanent magnet 7 and the length m0 of the permanent magnet 7 along the q-axis direction, the length of the permanent magnet 7 can be reasonably defined, so that an air gap exists between the permanent magnet 7 and the magnetic steel groove at the shaft hole side, and the magnetic leakage phenomenon of the tangential motor at the paraxial side can be effectively restrained.

When the permanent magnets are magnetized tangentially, a magnetism gathering effect exists between two adjacent permanent magnets, if a magnetism isolating structure is not arranged between the magnetic steel and the magnetic steel groove, magnetic force lines are distributed along the iron core and the shaft when being close to the shaft, so that the problems of shaft voltage and the like are caused when the motor operates, and the magnetism can be effectively isolated by reasonably setting the relation between the length of the magnetic steel and an air gap.

In one embodiment, the rotor core 1 is further provided with a separation rib 6, and the separation rib 6 includes a first separation rib 61 located between the magnetic steel groove 3 and the slit groove 4, and a second separation rib 62 located between the slit groove 4 and the outer circumference of the rotor core 1, where the width of the first separation rib 61 is m1, the width of the second separation rib 62 is m2, m1 < 1mm, and m2 < 1mm.

In the present embodiment, the widths of the first separating rib 61 between the slit groove 4 of the first portion 41 perpendicular to the q-axis and the magnetic steel groove 3 and the second separating rib 62 between the slit groove 4 of the second portion 42 extending in the d-axis direction and the outer circumference of the rotor are both ensured to be smaller than 1mm, and magnetic field saturation can be utilized to avoid magnetic leakage and increase the utilization ratio of the magnetic field.

In one embodiment, 0.3 mm.ltoreq.m1.ltoreq.0.5 mm,0.3 mm.ltoreq.m2.ltoreq.0.5 mm.

In this embodiment, by limiting the upper and lower limits of m1 and m2, the width of the separation rib can be ensured, the separation rib is easy to achieve magnetic saturation, magnetic leakage is reduced, magnetic field saturation is used for avoiding magnetic leakage, the utilization rate of the magnetic field is increased, the mechanical strength of the motor can be reduced due to the fact that the values of m1 and m2 are too small, and the magnetic field performance and the structural strength of the rotor structure can be effectively ensured.

In one embodiment, the rotor core 1 is further provided with a separation rib 6, the separation rib 6 includes a second separation rib 62 located between the slit groove 4 and the outer circle of the rotor core 1, the width of the second separation rib 62 is m2, the arc length of the second separation rib 62 is L4, and L4/m2=5 to 9.

The width m2 of the second separation rib 62 and the ratio between the arc length L4 of the second separation rib 62 are limited, so that the reasonable ratio between the length of the second separation rib 62 and the arc length of the end part of the magnetic barrier can be ensured, the mechanical strength of the rotor in the running process is ensured to meet the standard, and meanwhile, the second separation rib 62 can play a role in effectively separating magnetic.

In one embodiment, the rotor core 1 is further provided with a spacer rib 6, the spacer rib 6 includes a first spacer rib 61 located between the magnetic steel groove 3 and the slit groove 4, the width of the first spacer rib 61 is m1, and the width of the magnetic steel groove 3 along the direction perpendicular to the q axis is b, where m 1/b=0.05 to 0.1.

By defining the relationship between the width m1 of the first partitioning rib 61 and the width b of the magnetic steel groove 3, the width b of the magnetic steel groove 3 is ensured to be in a reasonable range, and the mechanical strength of the rotor structure is not damaged on the basis of ensuring the magnetic field strength.

In one embodiment, the rotor core 1 is further provided with a spacer rib 6, and the spacer rib 6 includes a first spacer rib 61 located between the magnetic steel groove 3 and the slit groove 4, where the width of the first spacer rib 61 is m1, and l0/m1=3 to 6.

By defining the relationship between the width L0 of the slit groove 4 and the width m1 of the first partition rib 61, it is possible to ensure that the ratio of the width of the first partition rib 61 between the permanent magnet 7 and the slit groove 4 of the first portion 41 perpendicular to the q-axis to the width of the slit groove 4 perpendicular to the q-axis is appropriate, thereby avoiding deformation of the rotor structure upon movement and improving structural stability and operational reliability of the rotor structure.

In one embodiment, the lengths of the first portions 41 sequentially increase along the direction from the outer circumference of the rotor core 1 to the shaft hole 5, the line between the radially outermost edge and the radially innermost edge of the first portion 41 located on the first side of the magnetic steel groove 3 is a first line, the line between the radially outermost edge and the radially innermost edge of the first portion 41 located on the second side of the magnetic steel groove 3 is a second line, and the included angle between the first line and the second line is α, α being equal to or greater than 60 °.

By limiting the included angle formed by the edge connecting lines of the slit grooves 4 on the two sides of the magnetic steel groove 3, which are far away from one side of the magnetic steel groove 3, of the first part 41, the length change of the slit grooves 4 can be limited, the inclination angle formed by the length change of the slit grooves 4 vertical to the q-axis direction is ensured to be larger than or equal to 60 degrees, the ratio of Lq/Ld of the motor can be increased, and the reluctance torque of the motor can be increased.

In one embodiment, the minimum spacing between adjacent slit grooves 4 in the q-axis direction is L1, L1 > L0.

By defining the relationship between the minimum interval L1 between adjacent slit grooves 4 and the width L0 of the slit groove 4 perpendicular to the q-axis in the q-axis direction, the width of the slit groove 4 perpendicular to the q-axis can be ensured, the inductance of the q-axis can be increased, and the reluctance torque can be increased by increasing the salient pole ratio of the motor, and the power density of the motor can be improved.

In one embodiment, L1/l0=1.4 to 1.5, the relationship between L1 and L0 can be optimized, the reasonable collocation of the width and the interval distance of the slit groove 4 is ensured, and the mechanical strength of the rotor structure is ensured.

In one embodiment, the slot 4 of the second portion 42 has a width L2, l2/l0=0.9 to 1.1 in the direction perpendicular to the d-axis.

In the present embodiment, by defining the proportional relationship between the width L2 of the slit groove 4 extending in the d-axis direction and the width L0 of the slit groove 4 perpendicular to the q-axis, the width of the slit groove 4 of the first portion 41 and the width of the slit groove 4 of the second portion 42 can be adapted, and the problem that the magnetic path saturation is affected due to the excessively large width change of the magnetic conduction channel caused by the excessively large width ratio of the two can be avoided, so that the permanent magnet torque can be more fully utilized, and the torque output of the motor can be improved as a whole.

In one embodiment, the angle between the slit slot 4 of the first portion 41 and the slit slot 4 of the second portion 42 is β, 145+.β < 180 °.

In this embodiment, by limiting the range of the included angle β between the slit groove 4 of the first portion 41 and the slit groove 4 of the second portion 42, the included angle between the slit grooves 4 in two different directions can be ensured, the difference between the direct axis inductance and the quadrature axis inductance of the motor can be increased, the reluctance torque of the motor can be increased, and the motor efficiency can be improved.

In one embodiment, the number of layers of the slit grooves 4 of the first portion 41 and the slit grooves 4 of the second portion 42 are the same, so that the structures of the slit grooves 4 of each layer are basically the same, and therefore the structures of magnetic conduction channels formed between adjacent slit grooves 4 are basically consistent, the magnetic force line passing efficiency of the permanent magnet 7 in each magnetic conduction channel is ensured to be basically consistent, the permanent magnet torque of the permanent magnet 7 is improved as a whole, and the output torque of the motor is improved.

In one embodiment, the length of the magnetic steel groove 3 in the q-axis direction is L, L/(R-R) =0.8 to 0.9.

Under the condition that the outer circle radius R and the inner circle radius R of the rotor core 1 are determined, the ratio of the length of the magnetic steel groove 3 relative to the radial width of the rotor core 1 is not more than 90%, so that the mechanical strength of the rotor structure in the moving process can be ensured, and the rotor structure is prevented from deforming. Meanwhile, the length of the magnetic steel groove 3 is not less than 80% relative to the radial width of the rotor core 1, the structural space of the rotor core 1 can be fully utilized, the permanent magnets 7 are arranged to the greatest extent, the permanent magnet torque of the permanent magnets 7 can be fully utilized, the permanent magnet torque can be better mixed with the reluctance torque formed by the slit groove 4, the asymmetry of the magnetic circuits of the d axis and the q axis of the rotor core of the motor is increased, the salient pole ratio of the motor is increased, the reluctance torque is improved, and the output torque of the motor is improved.

In one embodiment, the length of the magnetic steel groove 3 in the q-axis direction is L, L/(ΣL0). Gtoreq.2.

In the present embodiment, by defining the proportional relationship between the length L of the magnetic steel groove 3 in the q-axis direction and the sum Σl0 of the widths of the slit grooves 4 perpendicular to the q-axis direction, the width of the magnetic conduction path can be defined by the ratio of the widths of the slit grooves 4 on both sides of the magnetic steel groove 3 to the width of the magnetic steel groove 3, and the structural strength of the rotor structure can be enhanced by the magnetic conduction path so that the rotor structure does not decrease in mechanical strength due to the arrangement of the slit grooves 4.

In one embodiment, the gap between the magnetic steel groove 3 and the permanent magnet 7 is filled with a non-magnetically permeable substance.

The gap is filled with the non-magnetic permeability substance, so that the magnetic leakage of the rotor core can be avoided by utilizing the non-magnetic permeability of the non-magnetic permeability substance, the permanent magnet 7 is fixed in the magnetic steel groove 3, the structural stability of the permanent magnet 7 in the magnetic steel groove 3 is ensured, and the mechanical strength of the rotor structure is enhanced.

In one embodiment, the magnetization direction of the permanent magnet 7 is tangential, and the shape of the permanent magnet 7 is rectangular.

In the present embodiment, the permanent magnet 7 extends in a direction perpendicular to the q-axis.

In one embodiment, the permanent magnet 7 includes a plurality of segments 71 spaced apart along the q-axis direction.

In the present embodiment, the permanent magnet 7 is divided into a plurality of segments 71 along the q-axis direction, and the plurality of segments 71 are arranged at intervals, so that the utilization efficiency of the permanent magnet 7 can be improved, the cost of the permanent magnet 7 can be reduced, and in addition, the cogging torque can be effectively reduced, and the torque ripple can be reduced.

In one embodiment, the width of the spacing section 72 between adjacent segments 71 is L5, L5 being greater than or equal to the width L0 of the slit groove 4 on both sides of the spacing section 72; the length of the segment 71 in the q-axis direction is less than or equal to the minimum interval L1 between adjacent slit grooves 4 on both sides of the segment 71.

Since the width of the spacing sections 72 between the adjacent segments 71 defines the spacing between the segments 71, which is also equivalent to defining the width of the segments 71 in the q-axis direction, when the width L5 of the spacing sections 72 between the adjacent segments 71 is greater than or equal to the width L0 of the slit grooves 4 on both sides of the spacing sections 72, the length of the segments 71 between the adjacent spacing sections 72 can be made smaller than or equal to the width of the magnetic conduction channels on both sides, which defines the width of the magnetic circuit, and therefore, when the length of the segments 71 is smaller than or equal to the width of the magnetic circuit, the magnetic circuit in the q-axis direction can be made not to appear as much as saturation points, and the torque pulsation of the motor can be reduced.

In this embodiment, the spacer 72 includes the cavity and is located the spacer rib of cavity week side, and the spacer rib can be spacing to the piece 71, conveniently carries out the installation fixedly of each piece 71, can improve rotor core's structural strength, and the width of spacer rib is less simultaneously, can effectively prevent the magnetic leakage again, increases the utilization ratio of magnetic field. The cavity may be filled with a non-magnetically permeable material, thereby further improving the mechanical strength of the rotor structure.

In one embodiment, the spacer segments 72 between adjacent segments 71 are placed opposite or offset from the slot 4 by a predetermined distance.

In one embodiment, the spacing sections 72 between the adjacent segments 71 may be disposed opposite to the slit grooves 4, that is, the center line of the spacing sections 72 in the q-axis direction coincides with the center line of the slit grooves 4 in the q-axis direction of the same layer.

In one embodiment, the spacing sections 72 between the adjacent segments 71 and the slit grooves 4 may also be placed with a preset distance offset, where the preset distance makes at least a part of the projection of the spacing sections 72 on the q axis coincide with the projection of the slit grooves 4 on the q axis, so that at least a part of the permanent magnet 7 can be opposite to and directly communicated with the magnetic conduction channel, ensuring that the magnetic force lines of the permanent magnet 7 can smoothly pass through the magnetic conduction channel, and ensuring the permanent magnet torque of the permanent magnet 7.

Referring in combination to fig. 3, in one embodiment, the permanent magnet 7 is of unitary construction.

In this embodiment, the slit grooves 4 on both sides of the magnetic steel groove 3 are symmetrically arranged about the q-axis, the permanent magnet 7 is magnetized tangentially, and the gap between the permanent magnet 7 and the magnetic steel groove 3 on one side of the shaft hole 5 is filled with a non-magnetically permeable material.

In one embodiment, in a section perpendicular to the central axis of the rotor core 1, the shaft hole 5 is formed of a multi-segment curve or a combination of a curve and a straight line, and the distance between the center and the outer edge of the shaft hole 5 is greater than or equal to the radius r.

The radius r is the set radius of the shaft hole. The distance between the center and the outer edge of the shaft hole 5 is larger than or equal to the radius r, so that the risk of magnetic leakage near the rotating shaft can be reduced, and the shaft voltage of the motor is prevented from being too high.

According to an embodiment of the invention, the motor comprises a stator structure and a rotor structure, wherein the rotor structure is the rotor structure, and an air gap is formed between the stator structure and the rotor structure.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (28)

1. The utility model provides a rotor structure, its characterized in that includes rotor core (1), rotor core (1) are folded by a plurality of rotor punching (2) and are formed, under a magnetic pole, set up magnet steel groove (3) along radial direction extension on rotor core (1), be provided with permanent magnet (7) in magnet steel groove (3), slot groove (4) have been seted up respectively to the circumference both sides of magnet steel groove (3), slot groove (4) include along first part (41) and second part (42) along the d axis direction that extend of direction perpendicular to q axis, slot groove (4) are provided with n layer along the q axis direction, n is greater than or equal to 2, the width of slot groove (4) of first part (41) along the q axis direction is L0, shaft hole (5) have been seted up at the center of rotor core (1), the radius of rotor core (1) is R, the radius of shaft hole (5) is R, (ΣL0)/(R-R) =0.3 ~ 0.5.

2. A rotor structure according to claim 1, characterized in that the width of each slit groove (4) of the first portion (41) in the q-axis direction is not uniform.

3. A rotor structure according to claim 2, characterized in that the ratio z between the maximum and minimum of the width of the slit groove (4) of the first portion (41) satisfies 1 < z.ltoreq.2.

4. The rotor structure according to claim 1, characterized in that the length of the permanent magnet (7) in the q-axis direction is m0, the length of the magnetic steel groove (3) in the q-axis direction is L, (L-m 0)/m0=0.2 to 0.3.

5. The rotor structure according to any one of claims 1 to 4, characterized in that the rotor core (1) is further provided with a separation rib (6), the separation rib (6) comprising a first separation rib (61) located between the magnetic steel groove (3) and the slit groove (4), and a second separation rib (62) located between the slit groove (4) and an outer circumference of the rotor core (1), the first separation rib (61) having a width m1, the second separation rib (62) having a width m2, m1 < 1mm, m2 < 1mm.

6. The rotor structure of claim 5, wherein 0.3 mm.ltoreq.m1.ltoreq.0.5 mm,0.3 mm.ltoreq.m2.ltoreq.0.5 mm.

7. The rotor structure according to any one of claims 1 to 4, characterized in that a separation rib (6) is further provided on the rotor core (1), the separation rib (6) includes a second separation rib (62) located between the slit groove (4) and the outer circumference of the rotor core (1), the width of the second separation rib (62) is m2, and the arc length of the second separation rib (62) is L4, L4/m2=5 to 9.

8. The rotor structure according to any one of claims 1 to 4, characterized in that a spacer rib (6) is further provided on the rotor core (1), the spacer rib (6) includes a first spacer rib (61) located between the magnetic steel groove (3) and the slit groove (4), a width of the first spacer rib (61) is m1, and a width of the magnetic steel groove (3) in a direction perpendicular to the q-axis is b, m 1/b=0.05 to 0.1.

9. The rotor structure according to claim 5, characterized in that the rotor core (1) is further provided with a separation rib (6), the separation rib (6) comprises a first separation rib (61) located between the magnetic steel groove (3) and the slit groove (4), and the width of the first separation rib (61) is m1, l0/m1=3-6.

10. The rotor structure according to any one of claims 1 to 4, characterized in that the length of the first portion (41) increases in order along the direction from the outer circumference of the rotor core (1) to the shaft hole (5), the line connecting the radially outermost edge and the radially innermost edge of the first portion (41) on the first side of the magnetic steel groove (3) is a first line, the line connecting the radially outermost edge and the radially innermost edge of the first portion (41) on the second side of the magnetic steel groove (3) is a second line, and the angle between the first line and the second line is α, α being equal to or greater than 60 °.

11. A rotor structure according to any one of claims 1-4, characterized in that the smallest spacing between adjacent slit grooves (4) in the q-axis direction is L1, L1 > L0.

12. The rotor structure of claim 11, wherein l1/l0=1.4-1.5.

13. The rotor structure according to any one of claims 1 to 4, characterized in that a distance between the slit groove (4) of the first portion (41) located at the outermost side of the rotor core (1) and the outer circumference of the rotor core (1) is a minimum value of a distance of the slit groove (4) of the first portion (41) in the q-axis direction.

14. The rotor structure according to any one of claims 1 to 4, characterized in that the width of the slit groove (4) of the second portion (42) in the direction perpendicular to the d-axis is L2, L2/l0 = 0.9-1.1.

15. A rotor structure according to any one of claims 1 to 4, characterized in that the slit grooves (4) of the second portion (42) are unevenly arranged in a direction perpendicular to the d-axis direction from a side closer to the permanent magnet (7) to a side farther from the permanent magnet (7).

16. The rotor structure according to any one of claims 1 to 4, characterized in that the angle between the slit groove (4) of the first part (41) and the slit groove (4) of the second part (42) is β,145 ° +.β < 180 °.

17. The rotor structure according to any one of claims 1 to 4, characterized in that the number of layers of the slot (4) of the first portion (41) and the slot (4) of the second portion (42) are the same.

18. A rotor structure according to any one of claims 1 to 3, characterized in that the length of the magnetic steel groove (3) in the q-axis direction is L, L/(R-R) =0.8 to 0.9.

19. A rotor structure according to any one of claims 1 to 3, characterized in that the length of the magnetic steel groove (3) in the q-axis direction is L, L/(Σl0) > 2.

20. The rotor structure according to any one of claims 1 to 4, characterized in that the gap between the magnetic steel groove (3) and the permanent magnet (7) is filled with a non-magnetically permeable substance.

21. The rotor structure according to any one of claims 1 to 4, characterized in that the magnetization direction of the permanent magnets (7) is tangential, the permanent magnets (7) being rectangular in shape.

22. The rotor structure according to any one of claims 1 to 4, characterized in that the permanent magnet (7) includes a plurality of segments (71) arranged at intervals along the q-axis direction.

23. A rotor structure according to claim 22, characterized in that the width of the spacing segments (72) between adjacent segments (71) is L5, L5 being greater than or equal to the width L0 of the slit grooves (4) on both sides of the spacing segments (72).

24. A rotor structure according to claim 22, characterized in that the length of the segment (71) in the q-axis direction is smaller than or equal to the minimum spacing L1 between adjacent slit grooves (4) on both sides of the segment (71).

25. A rotor structure according to claim 22, characterized in that the distance segments (72) between adjacent segments (71) are placed opposite or staggered a preset distance from the slit groove (4).

26. A rotor structure according to any one of claims 1-4, characterized in that the permanent magnets (7) are of unitary construction.

27. The rotor structure according to any one of claims 1 to 4, characterized in that the shaft hole (5) is formed by a multi-segment curve or by a combination of a curve and a straight line in a section perpendicular to a central axis of the rotor core (1), a distance between a center and an outer edge of the shaft hole (5) being greater than or equal to a radius r.

28. An electric machine comprising a stator structure and a rotor structure, the rotor structure being the rotor structure of any one of claims 1 to 27, an air gap being formed between the stator structure and the rotor structure.

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