CN110797994A

CN110797994A - Permanent magnet motor and washing machine with same

Info

Publication number: CN110797994A
Application number: CN201810863313.8A
Authority: CN
Inventors: 郭丙春
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-02-14

Abstract

The invention discloses a permanent magnet motor and a washing machine with the same, the permanent magnet motor comprises a stator component and a motor end cover, the stator component comprises a stator and a stator injection molding part, the stator comprises a stator core and a stator winding, the stator winding is wound on the stator core, the stator injection molding part coats the stator winding, the motor end cover comprises a front end cover and a rear end cover, the front end cover and the rear end cover are respectively arranged at two axial ends of the stator component, at least one end of the stator component is matched with a spigot of the corresponding motor end cover, at least one end of the stator component is provided with one of a first limit bulge and a first limit groove, the motor end cover corresponding to the at least one end of the stator component is provided with the other one of the first limit bulge and the first limit groove, the first limit bulge is matched with the first limit groove, to limit rotation of the stator assembly relative to the corresponding motor end cap about a central axis of the stator assembly. The permanent magnet motor has good sound quality and is convenient to assemble.

Description

Permanent magnet motor and washing machine with same

Technical Field

The invention relates to the technical field of household appliances, in particular to a permanent magnet motor and a washing machine with the same.

Background

In the related art, the permanent magnet motor has the following problems: (1) the multiple rotor poles of the rotor core are connected by adopting a magnetic bridge and are matched with the stator core to form an electromagnetic design, and the performance indexes such as the overall efficiency and the like of the permanent magnet motor are lower due to the magnetic bridge leakage loss between the rotor poles; (2) the assembly of the permanent magnet motor is complicated; (3) the stator component is easy to generate low-frequency vibration, so that the permanent magnet motor has larger noise; (4) most permanent magnet motor's automatically controlled board adopts plastic housing or metal-back cover installation, then adopts screw locking to the rear end cap on, and the device that diverges of automatically controlled board needs to combine with solitary fin simultaneously, carries out the heat dissipation and handles, guarantees motor normal operating, and this kind of setting leads to the assembly complicacy, with high costs.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a permanent magnet motor which has good sound quality and is convenient to assemble.

The invention also provides a washing machine with the permanent magnet motor.

According to an embodiment of the first aspect of the invention, a permanent magnet machine comprises: the stator assembly comprises a stator and a stator injection molding piece, the stator comprises a stator core and a stator winding, the stator winding is wound on the stator core, and the stator winding is coated by the stator injection molding piece; the motor end cover comprises a front end cover and a rear end cover, the front end cover and the rear end cover are respectively arranged at the two axial ends of the stator assembly, at least one end of the stator assembly is matched with the spigot of the motor end cover, at least one end of the stator assembly is provided with one of a first limiting bulge and a first limiting groove, the motor end cover corresponds to at least one end of the stator assembly, the first limiting bulge is formed on the motor end cover, the other one of the first limiting bulge and the first limiting groove is formed in the motor end cover, the first limiting bulge is matched with the first limiting groove, and therefore the stator assembly is limited to rotate around the central axis of the stator assembly relative to the rotation of the motor end cover.

According to the permanent magnet motor provided by the embodiment of the invention, the stator component is formed into a whole by arranging the stator injection molding part, so that the inherent frequency of the stator component is improved, the noise of the permanent magnet motor is improved, the use comfort of a user is improved, the matching precision of the permanent magnet motor is effectively improved, the uniformity of an air gap is ensured, and the noise of the permanent magnet motor is further improved; at least one end of the stator component is matched with a spigot of the end cover of the motor, so that the uniformity of an air gap is further ensured; through the cooperation of the first limiting bulge and the first limiting groove, the stator assembly and the motor end cover realize the positioning between the stator assembly and the motor end cover and are convenient to assemble.

According to some embodiments of the invention, the stator injection molded part covers an outer peripheral wall of the stator.

According to some embodiments of the invention, the stator injection molded part comprises: an injection molded part body; at least one cooperation is protruding, the cooperation is protruding to be established the tip of injection molding body, the bellied periphery wall of cooperation is located the inboard of the periphery wall of injection molding body, with the protruding correspondence of cooperation be formed with on the motor end cover with the protruding complex cooperation concave part of cooperation.

According to some embodiments of the invention, the peripheral wall of the mating projection is perpendicular to the end face of the mating projection.

According to some embodiments of the present invention, the stator assembly is provided with the first limiting protrusion, the first limiting protrusion is provided on an outer circumferential wall of the fitting protrusion, the motor end cover corresponding to the at least one end of the stator assembly is provided with the first limiting groove, and the first limiting groove is formed on an inner circumferential wall of the fitting groove portion.

According to some embodiments of the invention, the front end cover and the rear end cover are connected through a plurality of connecting pieces, the connecting pieces are arranged at intervals along the circumferential direction of the permanent magnet motor, a plurality of avoiding grooves which are through along the axial direction of the permanent magnet motor are formed on the injection molding part body, and the avoiding grooves are used for avoiding the connecting pieces.

According to some embodiments of the invention, the permanent magnet electric machine further comprises: the electric control board is fixed on the rear end cover, a heating device is arranged on the electric control board, and the heating device is in direct contact with the surface of the rear end cover.

According to some embodiments of the invention, the front end cap is injection molded integrally with the stator injection molded part.

According to some embodiments of the invention, an installation groove is formed on the rear end cover, the electric control board is arranged in the installation groove, the heating device is in surface contact with the wall surface of the installation groove, a glue pouring piece is arranged in the installation groove, and the glue pouring piece covers the electric control board.

According to some embodiments of the present invention, two connection holes are formed in the wall surface of the mounting groove, the two connection holes are respectively located at two opposite sides of the heat generating device, a limiting member is inserted into each connection hole, and the limiting member limits movement of the heat generating device.

According to some embodiments of the present invention, a rotor assembly is disposed in the stator assembly, the rotor assembly includes a rotor, the rotor includes a rotor core and a plurality of permanent magnets, the rotor core is formed with a plurality of matching slots, the plurality of matching slots are spaced apart from each other along a circumferential direction of the rotor core, the plurality of permanent magnets are correspondingly matched in the plurality of matching slots, an outer side of each matching slot is open, the rotor core is formed with a plurality of groups of flux barriers, each group of flux barriers is located between two adjacent matching slots, and each group of flux barriers includes at least one flux barrier penetrating in an axial direction of the permanent magnet motor.

According to some embodiments of the present invention, the magnetism isolating groove group includes two magnetism isolating grooves, and the two magnetism isolating grooves of each magnetism isolating groove group are symmetrical with respect to a center line of a portion of the corresponding rotor core located between adjacent two of the fitting grooves.

According to some embodiments of the invention, the magnetic isolation groove is formed in a long strip shape, and the length L and the width H of the magnetic isolation groove respectively satisfy: l is less than or equal to 8mm, and H is less than or equal to 2 mm.

According to some embodiments of the present invention, the cross section of the rotor core has a predetermined area, and the magnetic isolation slot group is located in the predetermined area, where the predetermined area has an inner boundary and an outer boundary, and a projection of a central axis of the permanent magnet motor on the cross section of the rotor core is taken as a center of the circle, a circle with a radius of 15mm is taken as the inner boundary, and a circle with a radius of 32mm is taken as the outer boundary.

A washing machine according to an embodiment of the second aspect of the invention comprises a permanent magnet motor according to the above-described embodiment of the first aspect of the invention.

According to the washing machine provided by the embodiment of the invention, by adopting the permanent magnet motor, the sound quality of the washing machine is improved, the experience comfort of a user is improved, and meanwhile, the washing machine is convenient to assemble.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a stator assembly of a permanent magnet electric machine according to an embodiment of the present invention;

FIG. 2 is a front view of the stator assembly shown in FIG. 1;

FIG. 3 is a side view of the stator assembly shown in FIG. 1;

FIG. 4 is a cross-sectional view of the stator assembly shown in FIG. 1;

fig. 5 is a schematic structural diagram of a permanent magnet electric machine according to an embodiment of the invention;

FIG. 6 is a front view of the permanent magnet machine shown in FIG. 5;

figure 7 is a side view of the permanent magnet machine shown in figure 5;

figure 8 is a cross-sectional view of the permanent magnet machine shown in figure 5;

fig. 9 is a schematic structural view of a rotor assembly of a permanent magnet electric machine according to an embodiment of the invention;

FIG. 10 is a front view of the rotor assembly shown in FIG. 9;

FIG. 11 is a cross-sectional view of the rotor assembly shown in FIG. 10;

fig. 12 is a sectional view of the rotor assembly shown in fig. 9.

Reference numerals:

permanent magnet motor 100, central axis 100a of permanent magnet motor,

The stator assembly 1, the first limit bulge 10, the stator 11, the stator core 111, the stator injection molding part 12,

An injection molding body 121, an avoiding groove 121a, a matching protrusion 122,

A motor end cover 2, a connecting piece 20, a mounting part 20a,

A front end cap 21, a matching groove part 21a, a rear end cap 22, a mounting groove 22a,

An electric control board 3, a heating device 31,

Rotor assembly 4, rotor 41,

A first injection molding piece 421, a positioning bulge 421a,

Second injection molding 422, third injection molding 423, fourth injection molding 424,

A second limit protrusion 420a, a third limit protrusion 420b,

Rotor core 411, rotor pole 4110,

Center line 411a, fitting groove 4111, magnetic isolation groove group 4112, magnetic isolation groove 4112a,

A permanent magnet 412,

Rotor assembly 5, motor shaft 51, bearing 52, belt pulley 53.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "length," "width," "thickness," "front," "rear," "inner," "outer," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.

A permanent magnet electric machine 100 according to an embodiment of the first aspect of the invention is described below with reference to fig. 1-12.

As shown in fig. 1 to 12, a permanent magnet motor 100 according to an embodiment of the present invention includes a stator assembly 1 and a motor end cover 2.

The stator assembly 1 includes a stator 11 and a stator injection molded part 12, the stator 11 includes a stator core 111 and a stator winding (not shown), the stator winding is wound on the stator core 111, and the stator injection molded part 12 covers the stator winding. The motor end cover 2 comprises a front end cover 21 and a rear end cover 22, the front end cover 21 and the rear end cover 22 are respectively arranged at two axial ends of the stator assembly 1, at least one end of the stator assembly 1 is matched with a spigot corresponding to the motor end cover 2, at least one end of the stator assembly 1 is provided with one of a first limiting bulge 10 and a first limiting groove, the motor end cover 2 corresponding to the at least one end of the stator assembly 1 is provided with the other one of the first limiting bulge 10 and the first limiting groove, and the first limiting bulge 10 is matched with the first limiting groove to limit the rotation of the stator assembly 1 around the central axis of the stator assembly 1 relative to the corresponding motor end cover 2.

For example, as shown in fig. 1 to 8, the stator core 111 may be formed substantially in an annular structure, the stator core 111 includes a plurality of stator teeth, the plurality of stator teeth are sequentially arranged along a circumferential direction of the stator core 111, each stator tooth includes a yoke portion and a tooth portion arranged along a radial direction of the stator core 111, the yoke portion may be formed in an arc-shaped structure, the yoke portions of the plurality of stator teeth are sequentially connected end to end along the circumferential direction of the stator core 111 to form an annular stator yoke, the tooth portions of the plurality of stator teeth are arranged at intervals along the circumferential direction of the stator core 111, a stator slot is defined between adjacent two stator teeth, and a stator winding is wound around the tooth portions of the plurality of stator teeth to be located in the stator slot; stator injection molding 12 can be around establishing on stator core 111 the back at stator winding department injection moulding in order to wrap the stator winding, that is to say, in the forming process of stator injection molding 12, stator 11 can inject the injection molding chamber of stator injection molding 12 with injection mold jointly, perhaps only inject the injection molding chamber of stator injection molding 12 by injection mold, only need guarantee that the axial both ends of stator injection molding 12 surpass the axial both ends of stator winding respectively for stator injection molding 12 wraps the axial both ends of stator winding, so that from stator assembly 1's outward appearance, can't see the stator winding. In the molding process of the stator injection molding 12, the stator injection molding 12 and the stator 11 may be directly formed into an integral structure without other structures to realize the connection of the stator injection molding 12 and the stator 11. Therefore, by arranging the stator injection molding part 12, the weight of the stator assembly 1 can be increased, the stator assembly 1 is formed into a whole, and the stator core 111, the stator winding and the stator injection molding part 12 are tightly combined, so that the inherent frequency of the stator assembly 1 is improved, low-frequency noise generated by low-frequency vibration of the stator assembly 1 is effectively avoided, the noise of the permanent magnet motor 100 is improved, and the use comfort of a user is improved; simultaneously, mould plastics through the mould, can guarantee the precision of the locating surface of stator injection molding 12, when stator subassembly 1 and motor end cover 2 cooperate, can effectively promote the cooperation precision between stator subassembly 1 and the motor end cover 2, thereby promote permanent-magnet machine 100's cooperation precision, and permanent-magnet machine 100's rotor subassembly 4 passes through permanent-magnet machine 100's motor shaft and motor end cover 2 cooperation, thereby can effectively control permanent-magnet machine 100's air gap, guarantee the degree of consistency of air gap, and then further improve permanent-magnet machine 100's noise, promote permanent-magnet machine 100's sound quality.

It can be understood that, when the injection molding cavity of the stator injection molding 12 is defined by the stator and the injection mold together in the molding process of the stator injection molding 12, the injection molding material can also flow into the stator groove, that is, there can be a part of the stator injection molding 12 in the stator groove, so that the injection mold does not need to shield the stator groove to prevent the injection molding material, thereby reducing the requirement on the injection mold and being beneficial to improving the molding efficiency of the stator injection molding 12. Wherein, stator core 111 can be laminated along permanent-magnet machine 100's axial by a plurality of stator punching, may have the gap between two adjacent stator punching, may have the gap between stator winding and the stator core 111, and in the forming process of stator injection molding 12, the material of moulding plastics can fill above-mentioned gap, gap etc. guarantees that stator module 1 forms into a inseparable whole, promotes stator module 1's rigidity.

The axial both ends of stator injection molding 12 can respectively with front end housing 21, rear end cap 22 tang cooperation, can further promote the cooperation precision between stator module 1 and the motor end cover 2, promote permanent-magnet machine 100's cooperation precision, further guaranteed the degree of consistency of air gap.

Of course, the stator injection molding 12 can also only be matched with the front end cover 21 seam allowance and between the stator injection molding 12 and the rear end cover 22 through other modes, or the stator injection molding 12 can only be matched with the rear end cover 22 seam allowance and between the stator injection molding 12 and the front end cover 21 through other modes, so that the matching precision of the permanent magnet motor 100 can be improved, the uniformity of an air gap is ensured, and the noise of the permanent magnet motor 100 is improved.

The two axial ends of the stator assembly 1 can be respectively provided with a first limiting bulge 10, the front end cover 21 and the rear end cover 22 are respectively provided with a first limiting groove, the first limiting bulge 10 at one axial end of the stator assembly 1 can be matched with the first limiting groove on the front end cover 21 to limit the stator assembly 1 to rotate around the central axis relative to the front end cover 21, the first limiting bulge 10 at the other axial end of the stator assembly 1 can be matched with the first limiting groove on the rear end cover 22 to limit the stator assembly 1 to rotate around the central axis relative to the rear end cover 22, so that the positioning between the stator assembly 1 and the front end cover 21 and between the stator assembly 1 and the rear end cover 22 can be realized, the positioning precision between the stator assembly 1 and the front end cover 21 and between the stator assembly 1 and the rear end cover 22 can be ensured, meanwhile, the assembly between the stator assembly 1 and the front end cover 21 and between the stator assembly, facilitating an increase in the assembly efficiency of the permanent magnet motor 100.

Or, first limit grooves may also be formed at both axial ends of the stator assembly 1, the front end cover 21 and the rear end cover 22 are both provided with first limit protrusions 10, the first limit groove at the axial end of the stator assembly 1 may be matched with the first limit protrusion 10 on the front end cover 21, and the first limit groove at the axial other end of the stator assembly 1 may be matched with the first limit protrusion 10 on the rear end cover 22; or, one of the two axial ends of the stator assembly 1 is formed with a first limiting groove, the other end is provided with a first limiting bulge 10, at this time, the motor end cover 2 matched with the one end of the stator assembly 1 is provided with the first limiting bulge 10, and the motor end cover 2 matched with the other end of the stator assembly 1 is formed with the first limiting groove; or, one of the two axial ends of the stator assembly 1 is formed with one of the first limiting protrusion 10 and the first limiting groove, the motor end cover 2 matched with the one end of the stator assembly 1 is formed with the other one of the first limiting protrusion 10 and the first limiting groove, and the first limiting protrusion 10 is matched with the first limiting groove. From this, through first spacing arch 10 and the cooperation of first spacing recess between stator module 1 and the motor end cover 2, be convenient for realize the location, promoted the packaging efficiency simultaneously.

Here, it should be noted that there is no relation between the stator assembly 1 and the motor end cover 2 being engaged by the first limit groove and the first limit protrusion 10, and whether the stator assembly 1 and the motor end cover 2 are in spigot engagement. For example, when the stator assembly 1 and the front end cover 21 are engaged with each other through the first limit groove and the first limit protrusion 10, the stator assembly 1 and the front end cover 21 may be in a spigot engagement or other engagement manners. The "central axis of the stator assembly 1" and the central axis 100a of the permanent magnet motor may be arranged to coincide. In the description of the present invention, "a plurality" means two or more.

According to the permanent magnet motor 100 provided by the embodiment of the invention, the stator component 1 is formed into a whole by arranging the stator injection molding part 12, so that the inherent frequency of the stator component 1 is improved, the noise of the permanent magnet motor 100 is improved, the use comfort of a user is improved, meanwhile, the matching precision of the permanent magnet motor 100 is effectively improved, the uniformity of an air gap is ensured, and the noise of the permanent magnet motor 100 is further improved; at least one end of the stator assembly 1 is matched with a spigot of the motor end cover 2, so that the uniformity of an air gap is further ensured; through the cooperation of the first limiting bulge 10 and the first limiting groove, the stator assembly 1 and the motor end cover 2 are positioned between the stator assembly 1 and the motor end cover 2, and the assembly is facilitated.

Specifically, as shown in fig. 1 to 4, the stator injection molded part 12 covers the outer peripheral wall of the stator 11, that is, the stator injection molded part 12 covers the outer peripheral wall of the stator core 111, so that the outer peripheral wall of the stator core 111 cannot be seen from the appearance of the stator assembly 1, in the molding process of the stator injection molded part 12, the injection cavity of the stator injection molded part 12 is defined by the stator 11 and the injection mold together, the stator 11 can be positioned by the inner peripheral wall of the stator core 111, that is, the mold core of the injection mold cooperates with the inner peripheral wall of the stator core 111 to position the stator 11, the outer peripheral wall of the stator core 111 does not need to cooperate with the injection mold, the stator core 111 is assembled into the injection mold, the positioning of the stator 11 is facilitated, the coaxiality of the mold core of the injection mold and the stator core 111 is ensured, and the coaxiality of the stator 11 and the injection, and simultaneously reduces the precision requirements of the injection mold and the stator core 111.

Further, the stator injection molding 12 includes an injection molding body 121 and at least one fitting protrusion 122, the fitting protrusion 122 is disposed at an end of the injection molding body 121, an outer peripheral wall of the fitting protrusion 122 is located at an inner side of an outer peripheral wall of the injection molding body 121, and a fitting groove portion 21a fitted with the fitting protrusion 122 is formed on the motor end cover 2 corresponding to the fitting protrusion 122. For example, in the example of fig. 1 to 4, two fitting protrusions 122 may be provided, two fitting protrusions 122 are respectively provided at both axial ends of the injection molded part body 121, each fitting protrusion 122 may be formed as an annular protrusion, the fitting protrusion 122 may be formed by protruding a part of the end surface of the injection molded part body 121 in the axial direction of the injection molded part body 121, the front end cover 21 and the rear end cover 22 are each formed with a fitting groove portion 21a, the fitting groove portion 21a may be formed as a fitting groove to be fitted with the fitting protrusion 122, one side of the fitting groove facing the stator injection molded part 12 is open, the fitting protrusion 122 may be fitted in the fitting groove from the open side of the fitting groove, so that the spigot fitting is formed between the stator injection molded part 12 and the front end cover 21, and between the stator injection molded part 12 and the rear end cover 22.

Certainly, the number of the matching protrusion 122 may also be one, the matching protrusion 122 is disposed at one of two axial ends of the injection molded part body 121, and the matching groove portion 21a is formed on the motor end cover 2 corresponding to the matching protrusion 122, so that a spigot matching is formed between the stator injection molded part 12 and the motor end cover 2, and the matching precision between the stator injection molded part 12 and the motor end cover 2 is ensured.

It is understood that the mating protrusion 122 may further include a plurality of sub-mating protrusions spaced along the circumferential direction of the permanent magnet motor 100, each of the sub-mating protrusions may be formed in an arc-shaped structure, and at the same time, the spigot mating between the stator injection molded part 12 and the motor end cover 2 may be achieved.

Optionally, as shown in fig. 1 to 4, an outer peripheral wall of the fitting protrusion 122 is perpendicular to an end surface of the fitting protrusion 122, the outer peripheral wall of the fitting protrusion 122 may be fitted with an inner peripheral wall of the fitting recess portion 21a to achieve radial positioning between the stator assembly 1 and the motor end cover 2, and the end surface of the fitting protrusion 122 may be fitted with a bottom wall of the fitting recess portion 21a to achieve axial positioning between the stator assembly 1 and the motor end cover 2, so as to further ensure fitting accuracy between the stator assembly 1 and the motor end cover 2. As shown in fig. 8, the inner peripheral wall of the fitting protrusion 122 is not correspondingly fitted with the motor end cover 2.

Here, it should be noted that "the bottom wall of the engagement recess portion 21 a" may refer to a wall surface of the engagement recess portion 21a on a side opposite to the open side of the engagement recess portion 21 a.

In some embodiments of the present invention, as shown in fig. 1 to 8, the stator assembly 1 is provided with a first limiting protrusion 10, the first limiting protrusion 10 is provided on an outer circumferential wall of the fitting protrusion 122, and the first limiting protrusion 10 may be formed by a part of the outer circumferential wall of the fitting protrusion 122 protruding outward in a radial direction of the permanent magnet motor 100, and a first limiting groove is formed on the motor end cover 2 corresponding to the at least one end of the stator assembly 1, and is formed on an inner circumferential wall of the fitting groove portion 21a, and the first limiting groove may be formed by an inner circumferential wall of the fitting groove portion 21a recessed outward in the radial direction of the permanent magnet motor 100, so that the first limiting protrusion 10 and the first limiting groove have a simple structure and are easy to implement.

One or more first limiting bulges 10 at one end of the stator assembly 1 can be arranged; when first spacing arch 10 is a plurality of, a plurality of spacing archs can be followed permanent-magnet machine 100's axial interval and set up, and first spacing recess can be a plurality of this moment, and a plurality of first spacing recesses can set up with a plurality of first spacing arch 10 one-to-one. The outer end face of first spacing arch 10 can set up with the periphery wall parallel and level of injection molding body 121 to guaranteed regularity, the aesthetic property of stator injection molding 12 structure, made first spacing arch 10 have good intensity simultaneously, guaranteed the cooperation stability of first spacing arch 10 and first spacing recess.

It is understood that the first limit projection 10 may be further provided on the end surface of the fitting projection 122, in which case the first limit projection 10 may be formed by a part of the end surface of the fitting projection 122 being convex in the axial direction of the permanent magnet motor 100, and the first limit groove may be formed by a bottom wall of the fitting groove portion 21a being concave in the axial direction of the permanent magnet motor 100.

In some embodiments of the present invention, as shown in fig. 1 to 8, the front end cover 21 and the rear end cover 22 are connected by a plurality of connecting members 20, the plurality of connecting members 20 are arranged at intervals along a circumferential direction of the permanent magnet motor 100, and each connecting member 20 may sequentially pass through the front end cover 21 and the rear end cover 22 along an axial direction of the permanent magnet motor 100; injection molding body 121 is formed with a plurality of grooves 121a of dodging that link up along permanent-magnet machine 100's axial on, dodge groove 121a and be used for dodging connecting piece 20, every dodge groove 121a can be by the radial inside recessed formation of permanent-magnet machine 100 of partial periphery wall of injection molding body 121, and every dodge groove 121a can run through the axial both ends of injection molding body 121 along permanent-magnet machine 100's axial, a plurality of grooves 121a of dodging can set up with a plurality of connecting pieces 20 one-to-one. From this, dodge groove 121a through the setting, avoided stator injection molding 12 to influence the front end housing 21 and the rear end housing 22 between be connected, guaranteed the smooth equipment of permanent-magnet machine 100, avoided simultaneously because of stator injection molding 12 leads to the occupation space increase of permanent-magnet machine 100, be convenient for guarantee permanent-magnet machine 100's occupation space. Wherein the connecting member 20 may be a bolt or the like.

In a further embodiment of the present invention, as shown in fig. 5 and 8, the permanent magnet motor 100 further includes an electric control board 3, the electric control board 3 can be connected to a terminal box on the outer peripheral wall of the stator injection molding part 12 to control the operation of the permanent magnet motor 100, the electric control board 3 is fixed on the rear end cover 22, the electric control board 3 is provided with a heating device 31, the heating device 31 is in direct contact with the surface of the rear end cover 22, so that the heat generated by the heating device 31 can be directly dissipated through the rear end cover 22 by conduction, thereby achieving effective heat dissipation of the electric control board 3 and prolonging the service life of the electric control board 3, compared with the prior art in which the heating device 31 needs to dissipate heat through a separate heat sink, on the premise of ensuring the normal operation of the electric control board 3, the assembly design of the electric control board 3 is simplified, the cost is reduced, the number of components is reduced, The reliability is realized, and the integrated design of the permanent magnet motor 100 and the electric control board 3 is realized, so that the permanent magnet motor 100 is formed into the integrated permanent magnet motor 100, and the control of the permanent magnet motor 100 is facilitated.

The rear end cap 22 may be an aluminum member, such as an aluminum casting, to improve the heat dissipation effect; of course, the rear end cap 22 may be made of other material with high thermal conductivity, and is not limited to metal. The "heat generating device 31" may refer to an electronic device that generates heat during the operation of the electronic control board 3, for example, the heat generating device 31 may be an IPM (Intelligent Power Module) component.

It will be understood that the electronic control board 3 may also be fixed to the front cover 21; the electronic control board 3 may further include a housing to be mounted on the motor cover 2 through the housing. Here, it should be noted that, in the present application, one end of the motor shaft of the permanent magnet motor 100 may penetrate through the motor end cover 2, and the other end of the motor shaft may be fitted in the other motor end cover 2, and the "front end cover 21" may refer to the motor end cover 2 through which the motor shaft penetrates, and the "rear end cover 22" may refer to the motor end cover 2 through which the motor shaft does not penetrate, that is, one end of the motor shaft may penetrate through the front end cover 21, and the other end of the motor shaft may be fitted in the rear end cover 22 without penetrating through the rear end cover 22. Therefore, when the electric control board 3 is fixed on the rear end cover 22, the electric control board 3 and the motor shaft can be prevented from interfering with each other, and the electric control board 3 can be conveniently installed.

Optionally, the front end cover 21 and the stator injection molding part 12 are integrally formed by injection molding, so that the front end cover 21 and the stator assembly 1 can be integrally formed, the connection reliability of the stator assembly 1 and the front end cover 21 is ensured, the matching precision of the stator assembly 1 and the front end cover 21 is ensured, the front end cover 21 is conveniently molded, and the processing efficiency of the permanent magnet motor 100 is improved. At this time, a spigot fit between the rear end cap 22 and the stator assembly 1 may be adopted.

It can be understood that the stator injection molded part 12 and the front end cover 21 may be formed by one-time injection molding, or the stator injection molded part 12 and the front end cover 21 may also be formed by multiple injection molding, for example, after the stator core 111 is wound, the stator injection molded part 12 may be injection molded on the stator 11 to form the stator assembly 1, and then the front end cover 21 is injection molded on the stator assembly 1, so that the stator assembly 1 and the front end cover 21 are formed into an integral structure.

Specifically, the rear end cover 22 is formed with an installation groove 22a, the electronic control board 3 is disposed in the installation groove 22a, the heating device 31 is in surface contact with the wall surface of the installation groove 22a, a potting member (not shown) is disposed in the installation groove 22a, and the potting member covers the electronic control board 3. For example, in the example of fig. 5 to 8, the mounting groove 22a may be formed by partially recessing the rear end surface of the rear end cover 22 in the axial direction of the permanent magnet motor 100, the rear side of the mounting groove 22a may be open, the electric control board 3 may be formed substantially in a flat plate structure, and the heat generating device 31 may be located on one side in the thickness direction of the electric control board 3; the electric control board 3 can be installed in the mounting groove 22a from back to front, so that the heating device 31 is in direct contact with the bottom wall and/or the side wall of the mounting groove 22a, the contact area between the heating device 31 and the rear end cover 22 is ensured, and the heat dissipation effect is ensured. After automatically controlled board 3 installed in mounting groove 22a, can be with encapsulating material recess mounting groove 22a in order to cover automatically controlled board 3, treat that encapsulating material slowly solidifies in order to form the encapsulating piece, the encapsulating piece has good leakproofness, can play damp-proofing effect to protect automatically controlled board 3, prevent that automatically controlled board 3 from taking place to damage.

Further, two connection holes are formed in the wall surface of the mounting groove 22a, the two connection holes are respectively located on two opposite sides of the heat generating device 31, a limiting member is inserted into each connection hole, and the limiting member limits movement of the heat generating device 31. For example, a connection hole may be formed on the bottom wall of the mounting groove 22a, and a limiting member in the connection hole may extend out of the connection hole, and when the electronic control board 3 is mounted in the mounting groove 22a, two limiting members may be respectively located at two sides of the heat generating device 31 opposite to each other to limit movement of the heat generating device 31, thereby ensuring positional stability of the heat generating device 31 and reliability in use of the electronic control board 3.

In some embodiments of the present invention, a rotor assembly 4 is disposed in the stator assembly 1, the rotor assembly 4 includes a rotor 41, the rotor 41 includes a rotor core 411 and a plurality of permanent magnets 412, the rotor core 411 is formed with a plurality of matching grooves 4111, the plurality of matching grooves 4111 are spaced apart along a circumferential direction of the rotor core 411, the plurality of permanent magnets 412 are correspondingly matched in the plurality of matching grooves 4111, an outer side of each matching groove 4111 is open, the rotor core 411 is formed with a plurality of groups of flux barriers 4112, each group of flux barriers 4112 is located between two adjacent matching grooves 4111, each group of flux barriers 4112 includes at least one flux barrier 4112a that penetrates along an axial direction of the permanent magnet motor 100.

For example, as shown in fig. 9 to 12, the rotor core 411 may be formed substantially in a ring-shaped structure, a plurality of fitting grooves 4111 are uniformly spaced in the circumferential direction of the rotor core 411, each fitting groove 4111 penetrates through both axial ends of the rotor core 411, a plurality of permanent magnets 412 may be fitted in the plurality of fitting grooves 4111 in a one-to-one correspondence, the cross-sectional shape of each fitting groove 4111 may be formed substantially in a square shape, and similarly, the cross-sectional shape of each permanent magnet 412 is also formed substantially in a square shape. The outside of every cooperation groove 4111 is opened, the inboard is sealed for the magnetic bridge is opened, has reduced permanent-magnet machine 100 magnetic leakage, and magnetic bridge magnetic leakage loss and performance such as the overall efficiency that leads to permanent-magnet machine 100 among the avoided conventional art are lower, thereby has guaranteed permanent-magnet machine 100's operating efficiency, promotes permanent-magnet machine 100's basic performance.

Each of the magnetism blocking groove groups 4112 includes one or more magnetism blocking grooves 4112a, and each magnetism blocking groove 4112a may penetrate both ends of the rotor core 411 in the axial direction of the permanent magnet motor 100. Although the above design of the slot 4111 increases the electromagnetic density of the permanent magnet motor 100, obtains a higher back electromotive force, and improves the performance of the permanent magnet motor 100, it may cause waveform distortion of the stator and rotor magnetic fields of the permanent magnet motor 100, and by providing the magnetism isolating slot 4112a, it may improve electromagnetic harmonics, improve magnetic field distortion, obtain sinusoidal back electromotive force, and obtain low cogging torque, back electromotive force tending to sine, and low load torque ripple.

Further, as shown in fig. 9-12, the rotor assembly 4 further includes a rotor injection molded part, which may be a plastic part, for example, Bulk Molding Compound (BMC), a first accommodating cavity and a second accommodating cavity are defined at two radial ends of each permanent magnet 412 and two radial ends of the corresponding matching groove 4111, the first accommodating cavity is located at the outer side of the second accommodating cavity, the rotor injection Molding part comprises a first injection Molding part 421, a second injection Molding part 422, a third injection Molding part 423 and a fourth injection Molding part 424, the first injection Molding part 421 is filled in the first accommodating cavity, the second injection Molding part 422 is filled in the second accommodating cavity, the mutually opposite wall surfaces in the first accommodating cavity are provided with second limiting protrusions 420a, the second limiting protrusions 420a are abutted against the outer end surfaces of the corresponding permanent magnets 412, and the mutually opposite wall surfaces in the second accommodating cavity are provided with third limiting protrusions 420 b. The third position-limiting protrusion 420b abuts against the inner end surface of the corresponding permanent magnet 412, so that the second position-limiting protrusion 420a and the third position-limiting protrusion 420b can realize radial positioning of the corresponding permanent magnet 412. Moreover, because the outside of cooperation groove 4111 is opened for the magnetic bridge is opened, may lead to rotor subassembly 4 in high-speed operation in-process, rotor subassembly 4's intensity is not enough, and fill in first holding the intracavity through first injection molding 421, with the outer end that covers permanent magnet 412, avoid permanent magnet 412 to expose in the air and impurity such as adsorption of iron fillings, influence rotor subassembly 4's operation, the effect of protection permanent magnet 412 has been played, the intensity of rotor subassembly 4 has been guaranteed simultaneously, and the radial positioning of permanent magnet 412 has further been guaranteed. In addition, through setting up the rotor injection molding, can suitably adjust the barycentric position of rotor subassembly 4 for the barycentric position of rotor subassembly 4 is located permanent-magnet machine's the central axis 100a, guarantees the axiality, is convenient for realize rotor subassembly 4's dynamic balance simultaneously, avoids producing the vibration.

Each rotor pole 4110 is provided with a through hole, the through hole can be a circular hole, and the third injection molding piece 423 is filled in the through hole; four injection molding 424 are two, and two fourth injection molding 424 are located the axial both ends of rotor 41 respectively, and first injection molding 412, second injection molding 422 and third injection molding 423 all connect two fourth injection molding 424, and two fourth injection molding 424 can restrict the axial displacement of a plurality of permanent magnet 412 to realize the axial positioning of permanent magnet 412, guaranteed the intensity of rotor injection molding simultaneously, avoid taking place to break away from between each part of rotor injection molding.

The second receiving cavity may not be filled with injection molding material, that is, the inner side of the permanent magnet 412 may not be provided with the second injection molding part 422. The outer circumferential wall of the first injection-molded member 421 may be flush with the outer circumferential wall of the rotor core 411. It will be appreciated that during the molding of the rotor injection molded part, some of the injection molding material may flow into the magnetism isolating groove 4112 a.

As shown in fig. 12, two side walls of the first injection molded part 421 in the circumferential direction of the permanent magnet motor 100 are both provided with a positioning protrusion 421a, two side walls of the first accommodating cavity in the circumferential direction of the permanent magnet motor 100 are both formed with a positioning groove, and the positioning protrusion 421a is correspondingly matched in the positioning groove, so that the matching reliability between the first injection molded part 421 and the first accommodating cavity is ensured, and the first injection molded part 421 is prevented from being separated from the first accommodating cavity due to the centrifugal force of the rotor assembly 4.

As shown in fig. 8 to 12, both ends of the motor shaft 51 are respectively provided with bearings 52, the two bearings 52 are respectively fitted on the front cover 21 and the rear cover 22, one end (e.g., the front end in fig. 8) of the motor shaft 51 protrudes out of the front cover 21, and the one end of the motor shaft 51 may be provided with a driven member such as a pulley 53, and the motor shaft 51, the two bearings 52, the pulley 53, and the rotor assembly 4 may form a rotor assembly. The permanent magnet motor 100 is operated, and the rotor assembly 4 rotates to drive the belt pulley 53 to rotate through the motor shaft 51.

Specifically, the magnetism blocking groove group 4112 includes two magnetism blocking grooves 4112a, and the two magnetism blocking grooves 4112a of each magnetism blocking groove group 4112 are symmetrical with respect to a center line 411a of a portion of the corresponding rotor core 411 located between two adjacent matching grooves 4111. For example, as shown in fig. 12, the rotor core 411 may include a plurality of rotor poles 4110, a plurality of rotor poles 4110 and a plurality of matching slots 4111 are alternately arranged in sequence along an axial direction of the rotor core 411, one matching slot 4111 is defined between two adjacent rotor poles 4110, one rotor pole 4110 is disposed between two adjacent matching slots 4111, each rotor pole 4110 is formed with a set of flux barriers 4112, each set of flux barriers 4112 includes two flux barriers 4112a, the two flux barriers 4112a of each set of flux barriers 4112 are spaced apart along a circumferential direction of the corresponding rotor pole 4110, each rotor pole 4110 has a center line 411a along the circumferential direction thereof, the two flux barriers 4112a of each set 4112 are symmetrically arranged with respect to the center line 411a of the corresponding rotor pole 411a, so that the rotor core 411 has good regularity, mass production is convenient, and the two flux barriers 4112a of each set 4112 can ensure air gap and electromagnetic torque under load, so as to reduce the cogging torque and the torque ripple of the permanent magnet motor 100 and ensure the performance of the permanent magnet motor 100. One through hole may be provided, and the through hole may be symmetrical with respect to the center line 411 a.

Alternatively, as shown in fig. 12, the magnetism shielding groove 4112a is formed in a long shape, and the length L and the width H of the magnetism shielding groove 4112a satisfy: l is less than or equal to 8mm, and H is less than or equal to 2mm, so that the magnetism isolating groove 4112a can be conveniently machined, and the performance of the magnetism isolating groove 4112a can be ensured.

In some embodiments of the present invention, the cross section of the rotor core 411 has a predetermined area, and the magnetic isolation slot group 4112 is located in the predetermined area, where the predetermined area may be formed as an annular area, and the predetermined area has an inner boundary and an outer boundary, and when a projection of the central axis 100a of the permanent magnet motor on the cross section of the rotor core 411 is taken as a center of a circle, a circle with a radius of 15mm is taken as the inner boundary, and a circle with a radius of 32mm is taken as the outer boundary, the plurality of magnetic isolation slot groups 4112 correspond to the predetermined area located between the inner boundary and the outer boundary of the rotor core 411, so as to ensure performance of the magnetic isolation slot 4112 a.

A washing machine according to an embodiment of the second aspect of the present invention comprises a permanent magnet motor 100 according to the above-described embodiment of the first aspect of the present invention. At least one mounting part 20a may be disposed on the motor cover 2, so that the permanent magnet motor 100 may be mounted to the washing machine through the mounting part 20 a. Optionally, the washing machine is a drum washing machine.

According to the washing machine provided by the embodiment of the invention, by adopting the permanent magnet motor 100, the sound quality of the washing machine is improved, the experience comfort of a user is improved, and meanwhile, the washing machine is convenient to assemble.

Other configurations and operations of the washing machine according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A permanent magnet electric machine, comprising:

the stator assembly comprises a stator and a stator injection molding piece, the stator comprises a stator core and a stator winding, the stator winding is wound on the stator core, and the stator winding is coated by the stator injection molding piece;

the motor end cover comprises a front end cover and a rear end cover, the front end cover and the rear end cover are respectively arranged at the two axial ends of the stator assembly, at least one end of the stator assembly is matched with the spigot of the motor end cover, at least one end of the stator assembly is provided with one of a first limiting bulge and a first limiting groove, the motor end cover corresponds to at least one end of the stator assembly, the first limiting bulge is formed on the motor end cover, the other one of the first limiting bulge and the first limiting groove is formed in the motor end cover, the first limiting bulge is matched with the first limiting groove, and therefore the stator assembly is limited to rotate around the central axis of the stator assembly relative to the rotation of the motor end cover.

2. The permanent magnet electric machine of claim 1 wherein the stator injection molded part encases the outer peripheral wall of the stator.

3. The permanent magnet electric machine of claim 2, wherein the stator injection molded part comprises:

an injection molded part body;

at least one cooperation is protruding, the cooperation is protruding to be established the tip of injection molding body, the bellied periphery wall of cooperation is located the inboard of the periphery wall of injection molding body, with the protruding correspondence of cooperation be formed with on the motor end cover with the protruding complex cooperation concave part of cooperation.

4. The permanent magnet motor according to claim 3, wherein the outer peripheral wall of the fitting projection is perpendicular to the end face of the fitting projection.

5. The permanent magnet motor according to claim 3, wherein the stator assembly is provided with the first limit protrusion, the first limit protrusion is provided on an outer circumferential wall of the fitting protrusion, the motor end cover corresponding to the at least one end of the stator assembly is provided with the first limit groove, and the first limit groove is formed on an inner circumferential wall of the fitting groove portion.

6. The permanent magnet motor according to claim 3, wherein the front end cover is connected with the rear end cover through a plurality of connecting pieces, the connecting pieces are arranged at intervals along the circumferential direction of the permanent magnet motor, a plurality of avoiding grooves which are communicated along the axial direction of the permanent magnet motor are formed in the injection molding body, and the avoiding grooves are used for avoiding the connecting pieces.

7. The permanent magnet electric machine according to any of claims 1-6, further comprising:

the electric control board is fixed on the rear end cover, a heating device is arranged on the electric control board, and the heating device is in direct contact with the surface of the rear end cover.

8. The permanent magnet electric machine of claim 7, wherein the front end cap is injection molded integrally with the stator injection molded part.

9. The permanent magnet motor according to claim 7, wherein a mounting groove is formed on the rear end cover, the electric control board is disposed in the mounting groove, the heating device is in surface contact with a wall surface of the mounting groove, a glue filling member is disposed in the mounting groove, and the glue filling member covers the electric control board.

10. The permanent magnet motor according to claim 9, wherein two connection holes are formed in the wall surface of the mounting groove, the two connection holes are respectively located at two opposite sides of the heat generating device, a limiting member is inserted into each connection hole, and the limiting member limits movement of the heat generating device.

11. The permanent magnet motor according to claim 1, wherein a rotor assembly is disposed in the stator assembly, the rotor assembly includes a rotor, the rotor includes a rotor core and a plurality of permanent magnets, the rotor core is formed with a plurality of matching grooves, the matching grooves are spaced apart from each other along a circumferential direction of the rotor core, the permanent magnets are correspondingly matched in the matching grooves, an outer side of each matching groove is open, a plurality of groups of magnetic isolation groove sets are formed in the rotor core, each group of magnetic isolation groove sets is located between two adjacent matching grooves, and each group of magnetic isolation groove sets includes at least one magnetic isolation groove that penetrates in an axial direction of the permanent magnet motor.

12. The permanent magnet electric machine according to claim 11, wherein the magnetism isolating groove group includes two magnetism isolating grooves, and two magnetism isolating grooves of each magnetism isolating groove group are symmetrical with respect to a center line corresponding to a portion of the rotor core between adjacent two of the fitting grooves.

13. The permanent magnet motor according to claim 11, wherein the magnetic isolation groove is formed in a long shape, and the length L and the width H of the magnetic isolation groove respectively satisfy the following conditions: l is less than or equal to 8mm, and H is less than or equal to 2 mm.

14. The permanent magnet motor according to claim 11, wherein the rotor core has a predetermined area in a cross section, and the magnetic separation slot group is located in the predetermined area, wherein the predetermined area has an inner boundary and an outer boundary, and a projection of a central axis of the permanent magnet motor on the cross section of the rotor core is taken as a center, a circle with a radius of 15mm is taken as the inner boundary, and a circle with a radius of 32mm is taken as the outer boundary.

15. A washing machine, characterized in that it comprises a permanent magnet motor according to any of claims 1-14.