CN116015010A

CN116015010A - Motor with a motor housing

Info

Publication number: CN116015010A
Application number: CN202310086684.0A
Authority: CN
Inventors: 贾武豪; 毛临书; 徐飞; 程云峰
Original assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd; Guangdong Meizhi Precision Manufacturing Co Ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-04-25

Abstract

The invention provides a motor, and relates to the technical field of motors. The motor includes: a rotor core; the first magnets are embedded in the rotor core, N first magnets are distributed at intervals along the circumferential direction of the rotor core, and N is an integer greater than 1; the second magnets are embedded in the rotor core, and are positioned between two adjacent first magnets in the circumferential direction of the rotor core; wherein, the rotor core is cut through a plane perpendicular to the axis of the rotor core to obtain a section; in cross section, the first magnet extends in the circumferential direction of the rotor core, and the second magnet extends in the radial direction of the rotor core.

Description

Motor with a motor housing

Technical Field

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

Background

In the related art, in order to generate high torque in a wide rotational speed range, a permanent magnet motor synthesizes output torque using permanent magnet torque and reluctance torque.

Permanent magnet torque is generated by the orthogonal action of magnets and armature currents, and the magnets are placed into the rotor core to generate reluctance torque. However, the included angle between the current of the motor and the induced potential can be increased by utilizing the reluctance torque, and the current amplitude and angle of the motor under the condition of outputting the same torque are increased, so that the utilization rate of the magnet is reduced. So that the motor has a problem of small power factor.

Therefore, how to overcome the above technical defects is a technical problem to be solved.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

To this end, the invention proposes an electric machine.

In view of this, a first aspect of the present invention provides an electric machine comprising: a rotor core; the first magnets are embedded in the rotor core, N first magnets are distributed at intervals along the circumferential direction of the rotor core, and N is an integer greater than 1; the second magnets are embedded in the rotor core, and are positioned between two adjacent first magnets in the circumferential direction of the rotor core; wherein, the rotor core is cut through a plane perpendicular to the axis of the rotor core to obtain a section; in cross section, the first magnet extends in the circumferential direction of the rotor core, and the second magnet extends in the radial direction of the rotor core.

The application proposes a motor, the electron includes rotor core, first magnet and second magnet. The rotor is made of metal materials, and the rotor core is columnar. The first magnet and the second magnet are made of permanent magnetic materials and embedded in the rotor core to form a rotor assembly.

On the basis, the number of the first magnets is N, N is an integer larger than 1, the rotor core, the first magnets and the second magnets are intercepted through the plane perpendicular to the axis of the rotor core, on the obtained section, the rotor core is circular, the N first magnets are located inside the rotor core and distributed at intervals in the circumferential direction of the rotor core, and particularly the N first magnets can be uniformly distributed on a circle taking the center of the rotor core as the center of a circle. The interval is left between two adjacent first magnets along the circumferential direction of the rotor core, the first magnets are arranged between two adjacent first magnets along the circumferential direction of the rotor core, and second magnets are uniformly distributed between any two adjacent first magnets.

The first magnets extend in the circumferential direction of the rotor core in cross section, and the pole first magnets extend in the rotor along an arc line sharing the center of a circle with the rotor core. And the second magnet extends in cross-section in the radial direction of the rotor core, i.e. the second magnet extends in the rotor along a straight line coinciding or parallel with a certain diameter of the rotor core. The extending direction of the first magnet and the second magnet refers to the shape trend of the first magnet and the second magnet on the section, and is not related to the shape of the contour line cut by the first magnet and the second magnet.

Therefore, the stator provided by the application is embedded with the tile-shaped first magnets with the convex surfaces facing the outer wall of the rotor core and the concave surfaces facing the axis of the rotor core, and the strip-shaped second magnets extending along the radial direction of the rotor core are arranged among the first magnets in an inserted manner.

In the related art, in order to increase reluctance torque of a permanent magnet motor, a circumferential permanent magnet inside a rotor core is often bent toward an outer circumferential surface of the rotor core. However, in this measure, the permanent magnet torque is smaller, and the reluctance torque involved in the current and voltage is larger, so that the orthogonal relationship between the magnetic flux and the torque becomes worse with the increase of the inductance in the permanent magnet shaft, resulting in the reduction of the power factor of the motor. In this regard, the present application can improve the flux linkage value of a unit area by using the first magnet and the second magnet in combination, so as to reduce the current and voltage included angle of the motor by enhancing the duty ratio of the permanent magnetic torque in the output torque of the motor, thereby improving the power factor of the motor, so as to solve the technical problems in the related art. And further, the structural layout of the permanent magnets in the motor is optimized, the power factor of the motor is improved, and the working efficiency of the motor is improved.

Specifically, the rotor core is made of silicon steel, and the first magnet and the second magnet are formed by rare earth sintered magnets, rare earth bonded magnets, ferrite sintered magnets or ferrite bonded magnets.

In addition, the motor provided by the invention can also have the following additional technical characteristics:

in the technical scheme, the two second magnets are in one group, the motor comprises N groups of second magnets, and the two second magnets in the same group are arranged side by side; in the circumferential direction of the rotor core, N second magnets and N sets of first magnets are alternately arranged.

In the technical scheme, a group of second magnets is arranged between two circumferentially adjacent first magnets, namely N second magnets and N groups of first magnets which are alternately distributed along the circumferential direction are arranged in the rotor core. Each group of first magnets comprises two first magnets, the two strip-shaped first magnets extend along a straight line parallel to the radial direction of the rotor core, and the two first magnets in the same group are arranged side by side.

Under this structure, the both ends of tile-shaped first magnet all are provided with a corresponding second magnet, and this structural layout is favorable to promoting the magnetic linkage value of unit area, can further strengthen the duty cycle of permanent magnet torque in the motor output torque, and then realizes optimizing the interior permanent magnet structural layout of motor, promotes motor power factor, promotes the technical effect of motor work efficiency.

In any of the above technical solutions, the rotor core includes a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked; the rotor core further comprises a shaft hole, the shaft hole and the rotor core share an axis, the diameter of the shaft hole is a first diameter, and the diameter of the rotor core is a second diameter; the rotor core still includes N first mounting hole and 2N second mounting hole, and first mounting hole and second mounting hole are located the shaft hole week side, and N first magnet one-to-one is located in the N first mounting hole, and 2N second magnet one-to-one is located in the 2N second mounting hole.

In the technical scheme, the rotor core consists of a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked together to form the columnar rotor core. The central area of the rotor is provided with a shaft hole, and the shaft hole is internally provided with a rotating shaft so as to output power to the outside of the motor through the rotating shaft. N first mounting holes are machined in the rotor core along the circumferential direction, the N first mounting holes encircle the periphery of the through hole, the shape of each first mounting hole is matched with that of each first magnet, and the N first magnets are inserted into the N first mounting holes in a one-to-one correspondence mode. Correspondingly, 2N second mounting holes are machined in the rotor core along the radial direction, the 2N second mounting holes encircle the periphery of the through hole, the shapes of the second mounting holes are matched with the shapes of the second magnets, and the 2N second magnets are inserted into the 2N second mounting holes in a one-to-one correspondence mode so as to form N magnetic poles.

Through setting up first mounting hole and second mounting hole, can be with first magnet and the accurate location of second magnet in the rotor core, ensure that the relative position of first magnet and second magnet on the rotor core is accurate, reduce the possibility that first magnet and second magnet misplace even deviate from, and then realize promoting motor structural stability, promote motor reliability, reduce the technical effect of motor fault rate.

Specifically, the central area of every silicon steel sheet all processes there is the circular slot, and the week side processing of circular slot has arc wall and bar groove, stacks together a plurality of silicon steel sheets in the assembly process, and guarantees that circular slot, arc wall and the bar groove on a plurality of silicon steel sheets align, and a plurality of circular slots make up into the through-hole, and a plurality of arc wall make up for first mounting hole, and a plurality of bar groove make up for the second mounting hole.

In any of the above technical solutions, a distance between a first mounting hole and an adjacent second mounting hole is a first pitch; the width of the adjacent second mounting holes is the first width; the first spacing is less than the first width.

In the technical scheme, two second mounting holes are correspondingly arranged at two ends of the arc-shaped first mounting hole respectively, the minimum distance between the first mounting hole and the second mounting hole adjacent to the first mounting hole is a first interval W3, the width of the second mounting hole adjacent to the first mounting hole is a first width W2, and the first interval is smaller than the first width on the basis.

The first space is controlled to be smaller than the first width, so that the saturation magnetic flux density of the rotor core part can be designed to be about 2.0T, the utilization rate of the rotor core is improved, the passing quantity of unit area of magnetic force lines is improved, the high-efficiency design requirement of the motor is further met, and the technical effect of improving the power factor of the motor is achieved.

Specifically, when the ferrite permanent magnet is selected as the first magnet and the second magnet, the magnetic density values of the first magnet and the second magnet are lower than those of rare earth materials, and the structural layout of the technical scheme is beneficial to improving the utilization rate of the stator core so as to avoid the problems of supersaturation, magnetic flux deformation and pulsation of the motor.

In any of the above-described aspects, in a radial direction of the rotor core, a distance between the second mounting hole and the shaft hole is a second pitch; the second spacing, the first diameter, and the second diameter satisfy the following relationship: RO2 is more than or equal to (D2-D1)/(3); wherein RO2 is the second interval, D2 is the second diameter, and D1 is the first diameter.

In this technical scheme, in the radial direction of the rotor core, the distance between the second mounting hole and the shaft hole is the second pitch RO2, the outer diameter of the rotor core is the second diameter D2, and the inner diameter of the rotor core, that is, the diameter of the through hole is the first diameter D1. On this basis, RO2, D1 and D2 satisfy the following relation: RO2 is equal to or more than (D2-D1)/(3).

Through limiting the size relation, the magnetic leakage rate of the motor can be precisely controlled, so that the output of the motor during high-frequency overload is enhanced, the torque pulsation of the motor is reduced, the anti-demagnetization capability of the motor is enhanced, the safety and reliability of the motor are further improved, and the technical effect of reducing the failure rate of the motor is achieved.

In any of the above-mentioned technical solutions, in a radial direction of the rotor core, a distance between the first mounting hole and the outer wall of the rotor core is a third pitch, and a distance between the second mounting hole and the outer wall of the rotor core is a fourth pitch L1; a fourth pitch that is equal to or greater than two times the third pitch; the fourth interval is larger than the thickness of the silicon steel sheet.

In the technical scheme, in the radial direction of the rotor core, the distance between the first mounting hole and the outer wall surface of the rotor core is a third distance L2, the thicknesses of the plurality of silicon steel sheets forming the rotor core are consistent, and the thickness of each silicon steel sheet is T. On this basis, L1 and T satisfy the following relation: l1 > T.

In any of the above technical solutions, the rotor core further includes N through holes, and the through holes are communicated with two second mounting holes adjacent to the first mounting hole; the through hole is positioned between the second mounting hole and the shaft hole.

In this technical scheme, still be provided with N through-holes in the rotor core, the through-hole is located between two second mounting holes of arc first mounting hole both sides, the left and right sides both ends intercommunication of through-hole two second mounting holes of first mounting hole both sides, and the through-hole is located between second mounting hole and the shaft hole in the radial direction of rotor core, two second mounting holes and a through-hole combination be the groove of a U font promptly, the opening side in this U font groove is towards the week side of stator core, first mounting hole is located the notch in U font groove. Wherein, in this U-shaped groove, second mounting hole region is used for filling second magnet, and the through-hole region can be selected to fill magnetic material, for example fills second mounting hole and through-hole through hyperbolic permanent magnet. However, in the technical scheme, the through hole area is not filled with magnetic materials, and two rectangular second magnets are inserted into the U-shaped groove to fill the two second mounting holes.

Through setting up the through-hole, can promote the performance of motor through optimizing the magnetic pole shape. On this basis, dodging the through-hole through limiting the second magnet and can forming the air barrier, can reduce the quantity of permanent magnet material on the one hand on the basis of satisfying the electrode design demand to reduce the manufacturing cost of motor, on the other hand can reduce the technology complexity of second magnet and rotor core, on the other hand the through-hole of fretwork can supply gas and liquid to flow, is favorable to promoting the gas-liquid mobility of motor.

In any of the above-described aspects, in a radial direction of the rotor core, a distance between the through hole and the shaft hole is a fifth pitch; the fifth spacing, the first diameter, and the second diameter satisfy the following relationship: RO1 is more than or equal to (D2-D1)/(2); wherein RO1 is the fifth distance, D2 is the second diameter, and D1 is the first diameter.

In this technical scheme, in the radial direction of the rotor core, the distance between the through hole and the shaft hole is the fifth pitch RO1, the outer diameter of the rotor core is the second diameter D2, and the inner diameter of the rotor core, that is, the diameter of the through hole is the first diameter D1. On this basis, RO1, D1 and D2 satisfy the following relation: RO2 is equal to or more than (D2-D1)/(2).

In any of the above technical solutions, the motor further includes: and a partition portion provided in the through hole, the partition portion partitioning the through hole in a tangential direction of the rotor core.

In this technical scheme, be provided with the partition portion in the through-hole, concrete partition portion transversely establishes at the through-hole middle part to separate the through-hole into left and right sides two parts, left side through-hole and the second mounting hole intercommunication that corresponds first mounting hole left side and close to, right side through-hole and the second mounting hole intercommunication that corresponds first mounting hole right side and close to. Through setting up the partition portion, can reduce the magnetic flux leakage volume of motor on the basis that forms the air barrier and guarantees motor enterprise fluxgate, and then realize promoting the motor energy ratio, promote the technological effect of motor practicality.

In any of the above technical solutions, the width of the partition portion is a second width, and the second width is greater than the thickness of the silicon steel sheet.

In this technical scheme, the width of the partition is the second width W5, the thickness of the plurality of silicon steel sheets constituting the rotor core is uniform, and the thickness of each silicon steel sheet is T. On this basis, W5 and T satisfy the following relation: w5 > T.

In any of the above technical solutions, the motor further includes: the stator core is cylindrical, and the rotor core penetrates through the stator core; a plurality of stator teeth which are arranged on the inner annular surface of the stator core and extend in the radial direction of the stator core; the plurality of stator teeth are distributed at intervals on the peripheral side of the rotor core, and two adjacent stator teeth enclose a stator slot facing the rotor core.

In this technical scheme, the motor still includes the stator core, and the stator core is the tube-shape, and the rotor core wears to establish in the inside of tube-shape stator core, and the outer ring face interval setting of stator core and rotor core. On the basis, a plurality of stator teeth extending towards the rotor core are arranged on the inner ring surface of the stator core, the plurality of stator teeth are distributed at intervals in the circumferential direction of the stator core, and the plurality of stator teeth encircle the circumferential side of the rotor core. Wherein, enclose between two adjacent stator teeth and close the stator groove, the stator groove is the U-shaped, and the notch in stator groove is towards the week side of rotor core. The motor also comprises windings which are wound on the peripheral side surface of the stator core and in the stator slots so as to be matched with the stator core to form a stator assembly. After the motor is electrified, the stator assembly generates an electromagnetic field, and the rotor assembly drives the rotating shaft to synchronously rotate under the action of the electromagnetic field so as to convert electric energy into mechanical energy.

In any of the above technical solutions, the width of the notch of the stator slot is a third width; the distance between the two second mounting holes corresponding to the two second magnets in the same group is a sixth interval; the sixth pitch is less than the third width.

In the technical scheme, the width of the notch of the stator slot is a third width Tb1, and the distance between two second mounting holes corresponding to two second magnets in the same group is a sixth interval W1, wherein Tb1 and W1 satisfy the following relation: w1 < Tb1.

By defining the above dimensional relationship, it is advantageous to precisely control the leakage rate of the motor and enhance the output of the motor at high frequency overload, thereby reducing the torque ripple of the motor and enhancing the anti-demagnetization capability of the motor.

In any of the above technical solutions, a distance between intermediate lines of two adjacent stator teeth is a seventh pitch; the seventh pitch is greater than the width of the second mounting hole.

In this technical scheme, the distance between the middle lines of two adjacent stator teeth is a seventh distance Tb2, and the seventh distance is the distribution pitch of the stator teeth. The width of the second mounting hole is W2, wherein Tb2 and W2 satisfy the following relation: tb2 > W2.

In any of the above technical solutions, a surface of the first magnet facing the axis of the rotor core is a first surface, a surface facing away from the axis of the rotor core is a second surface, the first surface is a concave cambered surface or a plane, and the second surface is a convex cambered surface.

In this aspect, the first magnet extending in the circumferential direction of the rotor core includes a first face facing the axis of the rotor core, i.e., facing the inside of the rotor core, and a second face facing the outer peripheral surface of the rotor core, i.e., facing the outside of the rotor core.

On the basis, the first surface can be selected as a plane, the first surface can also be selected as a concave cambered surface, and the second surface is a convex cambered surface. When the concave cambered surface is selected as the first surface, the first magnet is tile-shaped. When the plane is selected as the first surface, the first magnet has a bread shape.

The first magnet protected by the technical scheme can be matched with the second magnets on two sides to improve the flux linkage value of a unit area, so that the included angle between the current and the voltage of the motor is reduced in a mode of enhancing the duty ratio of the permanent magnet torque in the output torque of the motor, and the power factor of the motor is improved. On the other hand, the processing difficulty of the second magnet with the shape protected by the technical scheme is small, and the processing complexity and the production cost are reduced.

In any of the above embodiments, the second magnet is rectangular.

In the technical scheme, the second magnets are rectangular, two rectangular second magnets in the same group are arranged side by side, and a space is reserved between the two second magnets. The use of a rectangular second magnet is advantageous in reducing the process complexity and production costs of the second magnet.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 shows one of the structural schematic diagrams of an electric machine according to one embodiment of the invention;

FIG. 2 shows a second schematic diagram of the structure of an electric machine according to an embodiment of the invention;

FIG. 3 shows a third schematic diagram of the motor according to one embodiment of the invention;

FIG. 4 shows a fourth schematic diagram of the structure of an electric machine according to one embodiment of the invention;

FIG. 5 shows a graph of the phase of the current and the magnetic flux of the motor according to one embodiment of the invention;

fig. 6 shows a data comparison diagram of a motor according to an embodiment of the present invention and a motor in the related art.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 4 is:

100 motor, 110 rotor core, 1102 shaft hole, 1104 first mounting hole, 1106 second mounting hole, 1108 through hole, 112 partition, 120 first magnet, 130 second magnet, 140 stator core, 142 stator teeth, 144 stator slots.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

An electric machine according to some embodiments of the invention is described below with reference to fig. 1 to 6.

As shown in fig. 1 and 2, an embodiment of a first aspect of the present invention proposes a motor 100, the motor 100 comprising: a rotor core 110; the first magnets 120 are embedded in the rotor core 110, N number of the first magnets 120 are distributed at intervals along the circumferential direction of the rotor core 110, and N is an integer greater than 1; the second magnets 130 are embedded in the rotor core 110, and the second magnets 130 are positioned between two adjacent first magnets 120 in the circumferential direction of the rotor core 110; wherein a cross section is obtained by taking the rotor core 110 through a plane perpendicular to the axis of the rotor core 110; in cross section, the first magnet 120 extends in the circumferential direction of the rotor core 110, and the second magnet 130 extends in the radial direction of the rotor core 110.

The present application proposes an electric machine 100, the electronics comprising a rotor core 110, a first magnet 120 and a second magnet 130. The rotor is made of metal material, and the rotor core 110 has a cylindrical shape. The first magnet 120 and the second magnet 130 are made of permanent magnetic materials, and the first magnet 120 and the second magnet 130 are embedded inside the rotor core 110 to constitute a rotor assembly.

On this basis, the number of the first magnets 120 is N, N is an integer greater than 1, the rotor core 110, the first magnets 120 and the second magnets 130 are cut through a plane perpendicular to the axis of the rotor core 110, on the obtained section, the rotor core 110 is circular, the N first magnets 120 are located inside the rotor core 110 and are distributed at intervals in the circumferential direction of the rotor core 110, and specifically, the N first magnets 120 may be uniformly distributed on a circle centered on the center of the rotor core 110. A space is left between two adjacent first magnets 120 along the circumferential direction of the rotor core 110, the first magnets 120 are arranged between two adjacent first magnets 120 along the circumferential direction of the rotor core 110, and second magnets 130 are arranged between any two adjacent first magnets 120.

Wherein the first magnet 120 extends in the circumferential direction of the rotor core 110 in cross section, and the pole first magnet 120 extends in the rotor along an arc line sharing the center of a circle with the rotor core 110. And the second magnet 130 extends in a radial direction of the rotor core 110 in cross section, i.e., the second magnet 130 extends in a straight line coincident with or parallel to a certain diameter of the rotor core 110 within the rotor. The extending direction of the first magnet 120 and the second magnet 130 refers to the shape of the first magnet 120 and the second magnet 130 in the cross section, and is not related to the shape of the contour line cut by the first magnet 120 and the second magnet 130.

Therefore, the stator provided by the application is embedded with the tile-shaped first magnets with the convex surfaces facing the outer wall of the rotor core 110 and the concave surfaces facing the axis of the rotor core 110, and the plurality of first magnets are inserted with the strip-shaped second magnets extending along the radial direction of the rotor core 110.

In the related art, in order to increase reluctance torque of a permanent magnet motor, a circumferential permanent magnet inside a rotor core is often bent toward an outer circumferential surface of the rotor core. However, in this measure, the permanent magnet torque is smaller, and the reluctance torque involved in the current and voltage is larger, so that the orthogonal relationship between the magnetic flux and the torque becomes worse with the increase of the inductance in the permanent magnet shaft, resulting in the reduction of the power factor of the motor. In this regard, the present application can increase the flux linkage value of a unit area by combining the first magnet and the second magnet, so as to reduce the current and voltage included angle of the motor 100 by increasing the duty ratio of the permanent magnetic torque in the output torque of the motor 100, thereby increasing the power factor of the motor 100, so as to solve the technical problems in the related art. And further, the structural layout of the permanent magnets in the motor 100 is optimized, the power factor of the motor 100 is improved, and the working efficiency of the motor 100 is improved.

Specifically, the rotor core 110 is made of silicon steel, and the first magnet 120 and the second magnet 130 are formed of rare earth sintered magnets, rare earth bonded magnets, ferrite sintered magnets, or ferrite bonded magnets.

As shown in fig. 1 and 2, in the above embodiment, two second magnets 130 are arranged in a group, and the motor 100 includes N groups of second magnets 130, and two second magnets 130 of the same group are arranged side by side; in the circumferential direction of the rotor core 110, N second magnets 130 and N sets of first magnets 120 are alternately arranged.

In this embodiment, a set of second magnets 130 is disposed between two circumferentially adjacent first magnets 120, i.e., N second magnets 130 and N sets of first magnets 120 alternately distributed in the circumferential direction are disposed inside the rotor core 110. Each set of first magnets 120 includes two first magnets 120, and each of the two strip-shaped first magnets 120 extends along a straight line parallel to the radial direction of the rotor core 110, and the two first magnets 120 of the same set are arranged side by side.

Under this structure, the both ends of tile-shaped first magnet 120 all are provided with a corresponding second magnet 130, and this structural layout is favorable to promoting the flux linkage value of unit area, can further strengthen the duty cycle of permanent magnet torque in the motor 100 output torque, and then realizes optimizing motor 100 interior permanent magnet structural layout, promotes motor 100 power factor, promotes motor 100 work efficiency's technical effect.

As shown in fig. 1 and 2, in any of the above embodiments, the rotor core 110 includes a plurality of silicon steel sheets, which are stacked; rotor core 110 further includes a shaft hole 1102, shaft hole 1102 sharing an axis with rotor core 110, shaft hole 1102 having a first diameter and rotor core 110 having a second diameter; the rotor core 110 further includes N first mounting holes 1104 and 2N second mounting holes 1106, the first mounting holes 1104 and the second mounting holes 1106 are located on the circumferential side of the shaft hole 1102, the N first magnets 120 are disposed in the N first mounting holes 1104 in a one-to-one correspondence, and the 2N second magnets 130 are disposed in the 2N second mounting holes 1106 in a one-to-one correspondence.

In this embodiment, the rotor core 110 is composed of a plurality of silicon steel sheets, and the plurality of silicon steel sheets are stacked together to form the columnar rotor core 110. Wherein, a shaft hole 1102 is formed in a central region of the rotor, and a rotation shaft is installed in the shaft hole 1102 to output power to the outside of the motor 100 through the rotation shaft. N first mounting holes 1104 are machined in the rotor core 110 along the circumferential direction, the N first mounting holes 1104 encircle the circumference of the through hole 1108, the shape of each first mounting hole 1104 is matched with that of each first magnet 120, and the N first magnets 120 are inserted into the N first mounting holes 1104 in a one-to-one correspondence mode. Correspondingly, 2N second mounting holes 1106,2N are machined in the rotor core 110 along the radial direction, the second mounting holes 1106 encircle the periphery of the through hole 1108, the shapes of the second mounting holes 1106 are matched with those of the second magnets 130, and the 2N second magnets 130 are inserted into the 2N second mounting holes 1106 in a one-to-one correspondence manner so as to combine N magnetic poles.

Through setting up first mounting hole 1104 and second mounting hole 1106, can be with first magnet 120 and the accurate location of second magnet 130 in rotor core 110, ensure that the relative position of first magnet 120 and second magnet 130 on rotor core 110 is accurate, reduce the dislocation of first magnet 120 and second magnet 130 even deviate from the possibility, and then realize promoting motor 100 structural stability, promote motor 100 reliability, reduce the technical effect of motor 100 fault rate.

Specifically, the central area of each silicon steel sheet is provided with a circular groove, the periphery of the circular groove is provided with an arc groove and a strip groove, a plurality of silicon steel sheets are stacked together in the assembly process, the alignment of the circular groove, the arc groove and the strip groove on the plurality of silicon steel sheets is ensured, the plurality of circular grooves are combined into a through hole 1108, the plurality of arc grooves are combined into a first mounting hole 1104, and the plurality of strip grooves are combined into a second mounting hole 1106.

As shown in fig. 1, in any of the above embodiments, the distance between the first mounting hole 1104 and the adjacent second mounting hole 1106 is the first pitch; the width of the adjacent second mounting hole 1106 is the first width; the first spacing is less than the first width.

In this embodiment, two second mounting holes 1106 are correspondingly disposed at two ends of the arc-shaped first mounting hole 1104, a minimum distance between the first mounting hole 1104 and the second mounting hole 1106 adjacent thereto is a first spacing W3, and a width of the second mounting hole 1106 adjacent to the first mounting hole 1104 is a first width W2, on the basis that the first spacing is smaller than the first width.

By controlling the first interval to be smaller than the first width, the saturation magnetic flux density of the rotor core 110 can be designed to be about 2.0T, so that the utilization rate of the rotor core 110 is improved, the passing quantity of unit area of magnetic force lines is improved, the efficient design requirement of the motor 100 is further met, and the technical effect of improving the power factor of the motor 100 is achieved.

Specifically, when ferrite permanent magnets are selected as the first magnet 120 and the second magnet 130, the magnetic density values of the first magnet 120 and the second magnet 130 are lower than those of rare earth materials, and the structural layout of this embodiment is advantageous to improve the utilization rate of the stator core 140, so as to avoid the problems of supersaturation, magnetic flux deformation and generation of pulsation of the motor 100.

As shown in fig. 1, in any of the above embodiments, in the radial direction of the rotor core 110, the distance between the second mounting hole 1106 and the shaft hole 1102 is a second pitch; the second spacing, the first diameter, and the second diameter satisfy the following relationship: RO2 is more than or equal to (D2-D1)/(3); wherein RO2 is the second interval, D2 is the second diameter, and D1 is the first diameter.

In this embodiment, the distance between the second mounting hole 1106 and the shaft hole 1102 in the radial direction of the rotor core 110 is the second pitch RO2, the outer diameter of the rotor core 110 is the second diameter D2, and the inner diameter of the rotor core 110, that is, the diameter of the through hole 1108 is the first diameter D1. On this basis, RO2, D1 and D2 satisfy the following relation: RO2 is equal to or more than (D2-D1)/(3).

Through limiting the above dimensional relationship, the magnetic leakage rate of the motor 100 can be precisely controlled to enhance the output of the motor 100 when the motor 100 is overloaded at high frequency, thereby reducing the torque pulsation of the motor 100, enhancing the anti-demagnetization capability of the motor 100, further realizing the technical effects of improving the safety and reliability of the motor 100 and reducing the failure rate of the motor 100.

As shown in fig. 1, in any of the above embodiments, in the radial direction of the rotor core 110, the distance between the first mounting hole 1104 and the outer wall of the rotor core 110 is a third pitch L2, and the distance between the second mounting hole 1106 and the outer wall of the rotor core 110 is a fourth pitch L1; a fourth pitch that is equal to or greater than two times the third pitch; the fourth interval is larger than the thickness of the silicon steel sheet.

In this embodiment, in the radial direction of the rotor core 110, the distance between the first mounting hole 1104 and the outer wall surface of the rotor core 110 is the third pitch, the thicknesses of the plurality of silicon steel sheets constituting the rotor core 110 are uniform, and the thickness of each silicon steel sheet is T. On this basis, L1 and L2 satisfy the following relation: l2 > 2 XL 1, L1 and T satisfy the following relation: l1 > T.

Specifically, in the radial direction of rotor core 110, second mounting hole 1106 and shaft hole 1102 are inspected for a distance L3, where L1 and L3 satisfy the following relationship: l3 is more than or equal to 2 xL 1.

As shown in fig. 1, in any of the above embodiments, the rotor core 110 further includes N through holes 1108, and the through holes 1108 communicate with two second mounting holes 1106 adjacent to the first mounting holes 1104; the through hole 1108 is located between the second mounting hole 1106 and the shaft hole 1102.

In this embodiment, N through holes 1108 are further disposed in the rotor core 110, the through holes 1108 are located between the two second mounting holes 1106 on two sides of the arc-shaped first mounting hole 1104, the left and right ends of the through holes 1108 are communicated with the two second mounting holes 1106 on two sides of the first mounting hole 1104, and the through holes 1108 are located between the second mounting holes 1106 and the shaft hole 1102 in the radial direction of the rotor core 110, that is, the two second mounting holes 1106 and one through hole 1108 are combined into a U-shaped groove, the opening side of the U-shaped groove faces the peripheral side of the stator core 140, and the first mounting hole 1104 is located in the notch of the U-shaped groove. Wherein, in the U-shaped groove, the second mounting hole 1106 area is used for filling the second magnet 130, and the through hole 1108 area is optionally filled with a magnetic material, for example, the second mounting hole 1106 and the through hole 1108 are filled with a hyperbolic permanent magnet. However, in this embodiment, the region of the through hole 1108 is not filled with magnetic material, and two rectangular second magnets 130 are inserted into the U-shaped slot to fill the two second mounting holes 1106.

By providing through holes 1108, the performance of the motor 100 may be improved by optimizing the pole shape. On the basis, an air barrier can be formed by limiting the second magnet 130 to avoid the through hole 1108, on one hand, the consumption of permanent magnet materials can be reduced on the basis of meeting the design requirement of the electrode, so that the production cost of the motor 100 can be reduced, on the other hand, the process complexity of the second magnet 130 and the rotor core 110 can be reduced, on the other hand, the hollowed through hole 1108 can supply air and liquid to flow, and the air-liquid fluidity of the motor 100 can be improved.

As shown in fig. 1, in any of the above embodiments, in the radial direction of rotor core 110, the distance between through hole 1108 and shaft hole 1102 is a fifth pitch; the fifth spacing, the first diameter, and the second diameter satisfy the following relationship: RO1 is more than or equal to (D2-D1)/(2); wherein RO1 is the fifth distance, D2 is the second diameter, and D1 is the first diameter.

In this embodiment, the distance between the through hole 1108 and the shaft hole 1102 in the radial direction of the rotor core 110 is the fifth pitch RO1, the outer diameter of the rotor core 110 is the second diameter D2, and the inner diameter of the rotor core 110, that is, the diameter of the through hole 1108 is the first diameter D1. On this basis, RO1, D1 and D2 satisfy the following relation: RO2 is equal to or more than (D2-D1)/(2).

As shown in fig. 3, in any of the above embodiments, the motor 100 further includes: and a partition 112 provided in the through hole 1108, the partition 112 partitioning the through hole 1108 in a tangential direction of the rotor core 110.

In this embodiment, a partition 112 is disposed in the through hole 1108, and the partition 112 is disposed transversely in the middle of the through hole 1108 to partition the through hole 1108 into left and right parts, wherein the left through hole 1108 communicates with the second mounting hole 1106 adjacent to the left side of the corresponding first mounting hole 1104, and the right through hole 1108 communicates with the second mounting hole 1106 adjacent to the right side of the corresponding first mounting hole 1104. Through setting up division portion 112, can reduce the magnetic flux leakage of motor 100 on the basis of forming the air barrier and guaranteeing motor 100 enterprise fluxion, and then realize promoting motor 100 energy efficiency ratio, promote the technological effect of motor 100 practicality.

As shown in fig. 3, in any of the above embodiments, the width of the partition 112 is a second width, which is greater than the thickness of the silicon steel sheet.

In this embodiment, the width of the partition 112 is the second width W5, the thicknesses of the plurality of silicon steel sheets constituting the rotor core 110 are uniform, and the thickness of each silicon steel sheet is T. On this basis, W5 and T satisfy the following relation: w5 > T.

As shown in fig. 4, in any of the above embodiments, the motor 100 further includes: the stator core 140, the stator core 140 is in a cylinder shape, and the rotor core 110 is arranged in the stator core 140 in a penetrating way; a plurality of stator teeth 142 provided on an inner circumferential surface of the stator core 140 and extending in a radial direction of the stator core 140; the plurality of stator teeth 142 are spaced apart on the circumferential side of the rotor core 110, and adjacent two stator teeth 142 enclose a stator slot 144 facing the rotor core 110.

In this embodiment, the motor 100 further includes a stator core 140, the stator core 140 is cylindrical, and the rotor core 110 is disposed inside the cylindrical stator core 140 in a penetrating manner, and an inner ring surface of the stator core 140 and an outer ring surface of the rotor core 110 are disposed at intervals. On the basis of this, a plurality of stator teeth 142 extending toward the rotor core 110 are provided on the inner circumferential surface of the stator core 140, the plurality of stator teeth 142 are spaced apart in the circumferential direction of the stator core 140, and the plurality of stator teeth 142 are wound around the circumferential side of the rotor core 110. Wherein, two adjacent stator teeth 142 enclose a stator slot 144 between, the stator slot 144 is U-shaped, and the notch of the stator slot 144 faces the circumference side of the rotor core 110. The motor 100 further includes windings wound around the circumferential side of the stator core 140 and in the stator slots 144 to cooperate with the stator core 140 to form a stator assembly. After the motor 100 is powered on, the stator assembly generates an electromagnetic field, and the rotor assembly drives the rotating shaft to synchronously rotate under the action of the electromagnetic field so as to convert electric energy into mechanical energy.

As shown in fig. 1 and 4, in any of the above embodiments, the width of the notch of the stator slot 144 is a third width; the distance between the two second mounting holes 1106 corresponding to the two second magnets 130 in the same group is a sixth pitch; the sixth pitch is less than the third width.

In this embodiment, the slot width of the stator slot 144 is the third width Tb1, and the distance between the two second mounting holes 1106 corresponding to the two second magnets 130 in the same group is the sixth pitch W1, wherein Tb1 and W1 satisfy the following relationship: w1 < Tb1.

By defining the above dimensional relationship, it is advantageous to precisely control the leakage rate of the motor 100 and enhance the output of the motor 100 at the time of high-frequency overload, thereby reducing the torque ripple of the motor 100 and enhancing the anti-demagnetization capability of the motor 100.

As shown in fig. 1 and 4, in any of the above embodiments, the distance between the intermediate lines of two adjacent stator teeth 142 is the seventh pitch; the seventh pitch is greater than the width of the second mounting hole 1106.

In this embodiment, the distance between the middle lines of two adjacent stator teeth 142 is a seventh distance Tb2, which is the distribution pitch of the stator teeth 142. The width of the second mounting hole 1106 is W2, where Tb2 and W2 satisfy the following relationship: tb2 > W2.

As shown in fig. 1 and 2, in any of the above embodiments, the surface of the first magnet 120 facing the axis of the rotor core 110 is a first surface, the surface facing away from the axis of the rotor core 110 is a second surface, the first surface is a concave arc surface or plane, and the second surface is a convex arc surface.

In this embodiment, the first magnet 120 extending in the circumferential direction of the rotor core 110 includes a first face facing the axis of the rotor core 110, i.e., facing the inside of the rotor core 110, and a second face facing the outer circumferential surface of the rotor core 110, i.e., facing the outside of the rotor core 110.

On the basis, the first surface can be selected as a plane, the first surface can also be selected as a concave cambered surface, and the second surface is a convex cambered surface. When the concave arc surface is selected as the first surface, the first magnet 120 is tile-shaped. When a plane is selected as the first surface, the first magnet 120 has a bread shape.

The first magnet 120 protected by this embodiment can cooperate with the second magnets 130 on two sides to increase the flux linkage value of a unit area, so as to reduce the included angle between the current and the voltage of the motor 100 by increasing the duty ratio of the permanent magnetic torque in the output torque of the motor 100, thereby improving the power factor of the motor 100. On the other hand, the processing difficulty of the second magnet 130 with the shape protected by this embodiment is smaller, which is beneficial to reducing the process complexity and the production cost.

As shown in fig. 1, in any of the above embodiments, the second magnet 130 has a rectangular shape.

In this embodiment, the second magnets 130 are rectangular, two rectangular second magnets 130 of the same group are arranged side by side, and a space is left between the two second magnets 130. The use of a rectangular second magnet 130 is advantageous in reducing the process complexity and production cost of the second magnet 130.

Fig. 4 is a cross-sectional view of motor 100 in a rotational horizontal direction in one embodiment of the present application. The motor 100 includes a rotor core 110 having a pole number of 6 and a stator core 140 having windings. The stator core 140 is nested in a housing made of iron, aluminum, or the like, the rotor core 110 is located on the inner shaft side of the stator core 140, and the rotor core 110 is fixed to the housing by a bearing manner so that the rotor core 110 and the stator core 140 are in a coaxial state.

The stator core 140 is laminated with silicon steel sheets, and an insulating member is wound around the windings of the stator core 140. The configuration shown in fig. 4 shows a distributed winding system of three phases.

The rotor core 110 is laminated with silicon steel sheets, similarly to the stator core 140, and the rotor core 110 is fixed to the rotating shaft. Two or more mounting holes are formed at regular intervals in the circumferential direction of the rotor core 110, and permanent magnets are inserted into the respective mounting holes to constitute magnetic poles.

The 36 slot stator and 6 pole rotor are illustrated in fig. 4, but are not limited to the slot pole mating described above.

The first mounting hole 1104 and the second mounting hole 1106 need to be chamfered in consideration of press working of the silicon steel sheet and mechanical strength at the time of use.

The first mounting hole 1104 is reserved with a certain width relative to the first magnet 120 to form a gap in the first mounting hole 1104, and correspondingly the second mounting hole 1106 is reserved with a certain length relative to the second magnet 130 to form a gap in the first mounting hole 1104, and the arrangement considers the magnetic leakage influence, and simultaneously reduces the demagnetizing influence of demagnetizing current on the first magnet 120 and the second magnet 130 when the motor 100 outputs reluctance torque.

Protruding structures may be provided in the first mounting hole 1104 and the second mounting hole 1106, so that the first magnet 120 and the second magnet 130 may be positioned by the protruding structures, and the first magnet 120 and the second magnet 130 may be positioned by filling portions of the gaps reserved in the first mounting hole 1104 and the second mounting hole 1106 with resin, inserting nonmagnetic pins into the gaps, or the like.

The number of layers and the presence or absence of division of the rotor core are not limited to this case.

The reason for the above design is that when both the first magnet 120 and the second magnet 130 are arc-shaped (two-layer reverse arc-shaped) facing the rotation axis side, the inductance Ld of the motor 100 is smaller than that of the two-layer reverse arc-shaped structure. By maintaining the gap between the first magnet 120 and the second magnet 130, the magnitude of Lq can be maintained, and the reluctance torque of the motor 100 is also effective. If the inductance Ld is large while keeping the inductance difference (Ld-Lq) the same as the current and Ld small (an extreme example of ld=0), the result of calculating the angle β between the phase of the total current I and the total magnetic flux is shown in fig. 5. By reducing the inductance Ld, orthogonality between current and magnetic flux is improved, thereby improving efficiency.

Wherein θ is the included angle between the combined current and flux of the motor 100 before improvement in the related art, θ 'is the included angle between the combined current and flux of the motor 100 after improvement in the present application, is the combined current vector before improvement, is' is the combined current vector after improvement, E0 is the induced potential vector, and phif flux vector.

In fig. 6, line 1 shows an induced voltage curve of the motor in the related art, line 2 shows a current curve of the motor in the related art, and line 3 shows a voltage curve of the motor 100 proposed in the present application.

It is to be understood that in the claims, specification and drawings of the present invention, the term "plurality" means two or more, and unless otherwise explicitly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the apparatus or element in question must have the particular orientation described, be constructed and operated in the particular orientation, so that these descriptions should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment 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

1. An electric machine, comprising:

a rotor core;

the first magnets are embedded in the rotor core, N first magnets are distributed at intervals along the circumferential direction of the rotor core, and N is an integer greater than 1;

The second magnet is embedded in the rotor core, and is positioned between two adjacent first magnets in the circumferential direction of the rotor core;

wherein a cross section is obtained by taking the rotor core through a plane perpendicular to an axis of the rotor core;

in the cross section, the first magnet extends in a circumferential direction of the rotor core, and the second magnet extends in a radial direction of the rotor core.

2. An electric machine according to claim 1, characterized in that,

the two second magnets are in a group, the motor comprises N groups of second magnets, and the two second magnets in the same group are arranged side by side;

in the circumferential direction of the rotor core, N second magnets and N sets of first magnets are alternately arranged.

3. An electric machine according to claim 2, characterized in that,

the rotor core comprises a plurality of silicon steel sheets, and the silicon steel sheets are stacked;

the rotor core further comprises a shaft hole, the shaft hole and the rotor core share an axis, the diameter of the shaft hole is a first diameter, and the diameter of the rotor core is a second diameter;

the rotor core further comprises N first mounting holes and 2N second mounting holes, the first mounting holes and the second mounting holes are located on the periphery of the shaft hole, N first magnets are arranged in the N first mounting holes in a one-to-one correspondence mode, and 2N second magnets are arranged in the 2N second mounting holes in a one-to-one correspondence mode.

4. The motor of claim 3, wherein the motor is configured to control the motor,

the distance between the first mounting hole and the adjacent second mounting hole is a first interval;

the width of the adjacent second mounting holes is a first width;

the first spacing is less than the first width.

5. The motor of claim 3, wherein the motor is configured to control the motor,

the distance between the second mounting hole and the shaft hole is a second interval in the radial direction of the rotor core;

the second pitch, the first diameter, and the second diameter satisfy the following relationship:

RO2≥(D2-D1)÷3；

wherein RO2 is the second interval, D2 is the second diameter, and D1 is the first diameter.

6. The motor of claim 3, wherein the motor is configured to control the motor,

in the radial direction of the rotor core, the distance between the first mounting hole and the outer wall of the rotor core is a third interval, and the distance between the second mounting hole and the outer wall of the rotor core is a fourth interval;

the third interval is larger than or equal to the fourth interval which is two times larger than the fourth interval;

and the fourth interval is larger than the thickness of the silicon steel sheet.

7. The motor of claim 3, wherein the motor is configured to control the motor,

the rotor core further comprises N through holes, and the through holes are communicated with two second mounting holes adjacent to the first mounting holes;

The through hole is located between the second mounting hole and the shaft hole.

8. The motor of claim 7, wherein the motor is configured to control the motor to drive the motor,

in the radial direction of the rotor core, the distance between the through hole and the shaft hole is a fifth distance;

the fifth spacing, the first diameter, and the second diameter satisfy the following relationship:

RO1≥(D2-D1)÷2；

wherein RO1 is the fifth distance, D2 is the second diameter, and D1 is the first diameter.

9. The electric machine of claim 7, further comprising:

and a partition portion provided in the through hole, the partition portion partitioning the through hole in a tangential direction of the rotor core.

10. The motor of claim 9, wherein the width of the partition is a second width, the second width being greater than the thickness of the silicon steel sheet.

11. A motor as claimed in claim 3, further comprising:

the stator core is cylindrical, and the rotor core penetrates through the stator core;

a plurality of stator teeth provided on an inner circumferential surface of the stator core and extending in a radial direction of the stator core;

the plurality of stator teeth are distributed at intervals on the periphery of the rotor core, and two adjacent stator teeth enclose a stator slot facing the rotor core.

12. The motor of claim 11, wherein the motor is configured to control the motor,

the width of the notch of the stator groove is a third width;

the distance between the two second mounting holes corresponding to the two second magnets in the same group is a sixth interval;

the sixth pitch is smaller than the third width.

13. The motor of claim 11, wherein the motor is configured to control the motor,

the distance between the middle lines of two adjacent stator teeth is a seventh interval;

the seventh pitch is greater than a width of the second mounting hole.

14. An electric machine according to any one of claims 1 to 13, characterized in that,

the surface of the first magnet facing the axis of the rotor core is a first surface, the surface facing away from the axis of the rotor core is a second surface, the first surface is a concave cambered surface or plane, and the second surface is a convex cambered surface.

15. The electric machine of any one of claims 1 to 13, wherein the second magnet is rectangular.