CN218387156U - Motor and electrical equipment - Google Patents

Abstract

The utility model discloses a motor and electrical equipment, the motor comprises an end cover, a rotor component, a stator component, a circuit board and a conductive structure, the stator component comprises a stator core and a winding wound on the stator core; the rotor assembly is rotationally arranged relative to the stator assembly and comprises a rotor core, a rotating shaft penetrating through the rotor core and a bearing sleeved on the rotating shaft, and the bearing is arranged on the end cover; the circuit board is electrically connected with the winding; the conductive structure comprises a reactance element, a first conductive piece and a second conductive piece which are all arranged on the circuit board, the reactance element comprises a capacitor or an inductor, one end of the first conductive piece is connected with one end of the reactance element, the other end of the first conductive piece is connected with the stator core, one end of the second conductive piece is connected with the other end of the reactance element, and the other end of the second conductive piece is connected with the end cover. According to the technical scheme, the shaft voltage is conveniently and reliably reduced, so that the risk of bearing electric corrosion is reduced, the service life of the bearing is prolonged, and the quality of the bearing is ensured.

Description

Motor and electrical equipment

Technical Field

The utility model relates to the technical field of motors, especially, relate to a motor and electrical equipment.

Background

In the high-frequency inverter driving mode, the motor generates a high-frequency common mode voltage, and the common mode voltage is divided into the bearings under the electrostatic capacity distribution effect in the motor to form a shaft voltage. When the amplitude of the shaft voltage is too high and exceeds the breakdown voltage of the oil film, instantaneous large current discharge can be generated, so that the bearing is damaged by electric corrosion, the service life of the bearing is shortened, the reliability is reduced, and bearing noise is generated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a motor and electrical equipment, aim at conveniently, reduce axle voltage reliably to reduce bearing galvanic corrosion risk, improve bearing life, guarantee the bearing quality.

In order to achieve the above object, the present invention provides a motor, which includes an end cap, a rotor assembly, a stator assembly, a circuit board and a conductive structure; the stator assembly comprises a stator core and a winding wound on the stator core; the rotor assembly is rotatably arranged relative to the stator assembly and comprises a rotor core, a rotating shaft penetrating through the rotor core and a bearing sleeved on the rotating shaft, and the bearing is arranged on the end cover; the circuit board is electrically connected with the winding; the conducting structure comprises a reactance element, a first conducting piece and a second conducting piece which are all arranged on the circuit board, the reactance element comprises a capacitor or an inductor, one end of the first conducting piece is connected with one end of the reactance element, the other end of the first conducting piece is connected with the stator core, one end of the second conducting piece is connected with the other end of the reactance element, and the other end of the second conducting piece is connected with the end cover.

Optionally, there are two of said bearings; correspondingly, the end cover comprises a first end cover and a second end cover, and the first end cover and the second end cover are connected in a conduction mode through a conduction piece.

Optionally, the first conductive component includes a conductive pin, one end of the conductive pin is connected to the circuit board, and the other end of the conductive pin is in press-connection with the stator core; and/or the second conductive piece comprises a conductive elastic piece, one end of the conductive elastic piece is connected with the circuit board, and the other end of the conductive elastic piece is abutted against and conducted with the end cover.

Optionally, a receiving groove is formed in one side, facing the circuit board, of the end cover; the conductive elastic sheet comprises a connecting section, a bending section and a reverse bending section, the connecting section extends from the direction of the circuit board towards the end cover, the bending section extends from the lateral bending of one end of the connecting section, which is far away from the circuit board, the reverse bending section extends from one end of the bending section, which is far away from the connecting section, towards the direction of the circuit board, the reverse bending section and the connecting section are arranged at intervals and respectively press two opposite side walls of the accommodating groove, and the bending section presses the groove bottom of the accommodating groove.

Optionally, the reactive element is soldered to the circuit board; and/or; the first conductive piece and/or the second conductive piece are/is welded on the circuit board.

Optionally, the stator assembly and the first end cap are integrally plastically packaged to form an injection molding stator, the circuit board is arranged on one side, facing the second end cap, of the injection molding stator, the periphery of the second end cap is connected with the injection molding stator, and the circuit board is covered.

Optionally, the stator of moulding plastics towards one side of second end cover is equipped with the mounting groove, be equipped with location structure in the mounting groove, the circuit board is located in the mounting groove and by location structure location.

Optionally, the reactance element is disposed on a side of the circuit board facing the second end cap, the second conductive piece and the reactance element are disposed on the same side, and the first conductive piece is disposed on a side of the circuit board facing away from the second end cap.

Optionally, a rib is arranged on one side of the injection molding stator facing the second end cover, a groove is arranged on one side of the second end cover facing the injection molding stator, and the groove is in interference fit with the rib; the convex rib surface is concavely provided with a limiting groove, and the second conductive piece is arranged along the limiting groove.

The utility model also provides an electrical equipment, include as above the motor.

The technical scheme of the utility model, the bearing install in the end cover, electrically conductive structure includes that reactance element, first electrically conductive piece and second electrically conductive piece, reactance element includes electric capacity or inductance, first electrically conductive piece with the electrically conductive one end of second with reactance element connects, the other end correspond with stator core with the end cover is connected, promptly stator core with between the end cover, establish ties and connect electric capacity or inductance, through electric capacity or the balanced common mode voltage circuit potential difference of bearing inner and outer lane of inductance to reduce shaft voltage, and reactance element first electrically conductive piece with the electrically conductive piece of second all sets up on the circuit board, be favorable to reactance element first electrically conductive piece with the electrically conductive fixed and connection of piece of second makes electrically conductive structure stability is good, and the reliability is high, thereby conveniently, reliably reduces shaft voltage, reduces the bearing electroerosion risk, improves bearing life, guarantees the bearing quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of an electric machine provided by the present invention;

FIG. 2 is a schematic structural view of the rotor assembly of FIG. 1;

FIG. 3 is a schematic structural view of the stator assembly of FIG. 1;

FIG. 4 is a schematic view of the combination of the first end cap and the conducting member in FIG. 1;

FIG. 5 is a schematic structural view of the second endcap of FIG. 1;

fig. 6 is a schematic view of a combined structure of the circuit board and the stator core in fig. 1;

FIG. 7 is a schematic structural view of the injection molded stator of FIG. 1;

FIG. 8 is a schematic view of the assembly of the injection molded stator and circuit board of FIG. 1;

fig. 9 is a schematic diagram of the circuit of the present invention;

fig. 10 is a simplified schematic diagram of fig. 9.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

In the high-frequency inverter driving mode, the motor generates a high-frequency common mode voltage, and the common mode voltage is divided into the bearings under the electrostatic capacity distribution effect in the motor to form a shaft voltage. When the amplitude of the shaft voltage is too high and exceeds the breakdown voltage of the oil film, instantaneous large current discharge can be generated, so that the bearing is subjected to electric corrosion damage, the service life of the bearing is shortened, the reliability is reduced, and bearing noise is generated.

In view of this, the utility model provides a motor and electrical equipment aims at conveniently, reduce the axle voltage reliably to reduce bearing galvanic corrosion risk, improve bearing life, guarantee the bearing quality. Fig. 1 to 8 are embodiments of the motor provided by the present invention, and fig. 9 and 10 are schematic circuit diagrams of the present invention.

In the embodiment of the present invention, please refer to the attached drawings, and focus on fig. 6, the present invention provides a motor 100, where the motor 100 includes an end cover 1, a rotor assembly 2, a stator assembly 3, a circuit board 4, and a conductive structure 5; the stator assembly 3 comprises a stator core 31 and a winding wound on the stator core 31; the rotor assembly 2 is rotatably arranged relative to the stator assembly 3, the rotor assembly 2 includes a rotor core, a rotating shaft 21 penetrating the rotor core, and a bearing 22 sleeved on the rotating shaft 21, and the bearing 22 is mounted on the end cover 1; the circuit board 4 is electrically connected with the winding; the conductive structure 5 includes a reactance element 51, a first conductive member 52 and a second conductive member 53 all disposed on the circuit board 4, the reactance element 51 includes a capacitor or an inductor, one end of the first conductive member 52 is connected to one end of the reactance element 51, the other end of the first conductive member 52 is connected to the stator core 31, one end of the second conductive member 53 is connected to the other end of the reactance element 51, and the other end of the second conductive member 53 is connected to the end cap 1.

The technical scheme of the utility model, bearing 22 install in end cover 1, conducting structure 5 includes reactance element 51, first electrically conductive 52 and the electrically conductive 53 of second, reactance element 51 includes electric capacity or inductance, first electrically conductive 52 with the electrically conductive 53 of second one end with reactance element 51 connects, the other end correspond with stator core 31 with end cover 1 connects, promptly stator core 31 with between end cover 1, establish ties and connect electric capacity or inductance, through the electric potential difference of bearing 22 inner and outer lane in the balanced common mode voltage circuit of electric capacity or inductance to reduce shaft voltage, and reactance element 51 first electrically conductive 52 with the electrically conductive 53 of second all sets up on the circuit board 4, be favorable to reactance element 51 first electrically conductive 52 with the fixed and the connection of electrically conductive 53 of second makes conducting structure 5 stability is good, and the reliability is high, thereby conveniently, reliably reduces shaft voltage, reduces bearing 22 electroerosion risk, improves bearing 22 life, guarantees bearing 22 quality.

Fig. 9 is a schematic circuit diagram of the present invention, in which Cx/Lx is the reactance element 51 (including capacitance or inductance) connected in series between the end cover 1 and the stator core 31, the whole circuit represents an equivalent circuit diagram of the electric drive system in which the motor 100 is located, gnd is a ground line, the voltage between the neutral point of the winding and the ground line is Vcom, i.e., common mode voltage, the capacitance between the winding and the end cover 1 is equivalent to Cbs, the capacitance between the end cover 1 and the ground line is equivalent to Cn, the capacitance between the winding and the stator core 31 is equivalent to Cs, the capacitance between the winding and the rotor core of the rotor assembly 2 is equivalent to Cm, the capacitance between the stator core 31 and the rotor core of the rotor assembly 2 is equivalent to Cg, the capacitance between the rotor core of the rotor assembly 2 and the rotating shaft 21 is equivalent to Cmg, the capacitance between the end cover 1 and the rotating shaft 21 is equivalent to Cb, and the capacitance between the rotating shaft 21 and the ground line is equivalent to Csn; after the capacitive-capacitive star-delta transformation, a simplified circuit diagram is obtained, that is, fig. 10, in which after the electrostatic capacitance of the motor 100 is changed, the capacitance between the winding and the end cap 1 is equivalent to C1, the capacitance between the winding and the rotating shaft 21 is equivalent to C2, the capacitance between the end cap 1 and the ground is equivalent to Cn1, the capacitance between the rotating shaft 21 and the ground is equivalent to Csn1, and the capacitance between the end cap 1 and the rotating shaft 21 is equivalent to Cb1, wherein the capacitance between the winding and the end cap 1 is equivalent to C1= F (Cx)/F (Lx), C1 is a Cx/Lx function related to the reactance element 51, and it can be seen from fig. 10 that the bridge design is performed between the inner ring and the outer ring of the bearing 22 (between the end cap 1 and the rotating shaft 21), the value of C1 can be adjusted by adjusting the capacitance or capacitance of the reactance element 51, so that the bridge balance can be achieved theoretically, the shaft voltage can be zero, in practical applications, the entity can be adjusted by the inductance or capacitance value of the series connection between the end cap 1 and the stator core 31, the inductance can be adjusted, the shaft voltage can be determined, the final bearing 22 can be used for the purpose of reducing the voltage, and reducing the risk of the bearing 22 can be determined by testing.

The utility model discloses it is right reactance element 51's concrete constitution does not do the restriction, for example, works as when reactance element 51 is electric capacity, electric capacity can be through the entity electric capacity of package plastic form encapsulation, and entity electric capacity is ceramic capacitor, aluminum electrolytic capacitor, tantalum electrolytic capacitor, multilayer ceramic capacitor, polypropylene electric capacity, high frequency porcelain dielectric capacitance or any one of glass glaze electric capacity, and entity electric capacity's electric capacity is easily controlled, is convenient for set up as required. When the reactance element 51 is an inductor, the inductor includes a common inductor, a color wheel inductor, an epoxy resin inductor, a chip inductor, etc., and is set according to actual needs.

When the number of the bearings 22 is two, and the two bearings 22 are disposed at two sides of the rotor core at intervals along the axial direction of the rotor core, the number of the end covers 1 is correspondingly two, including the first end cover 11 and the second end cover 12, and in order to realize the reduction of the voltage of the bearing 22 corresponding to the two bearings 22, it may be referred to the above embodiment, that one reactance element 51 is connected in series between the first end cover 11 and the stator core 31, and one reactance element 51 is also connected in series between the second end cover 12 and the stator core 31.

The present invention is not limited to the specific structure of the first conductive member 52 and the second conductive member 53, and may be a combination of a conductive wire and a terminal connecting member. The utility model discloses an in the embodiment, first electrically conductive 52 sets up to electrically conductive contact pin 521, the one end of electrically conductive contact pin 521 with circuit board 4 is connected, the other end of electrically conductive contact pin 521 with stator core 31 crimping switches on, stator core 31 surface is comparatively hard, through the setting of electrically conductive contact pin 521 can be realized electrically conductive contact pin 521 with effectively switch on and firm joint between the stator core 31 improves structural stability and reliability.

The utility model discloses a further embodiment, the second is electrically conductive 53 sets up to electrically conductive shell fragment 531, the one end of electrically conductive shell fragment 531 with circuit board 4 connects, the other end of electrically conductive shell fragment 531 with end cover 1 supports to keep switching on, electrically conductive shell fragment 531 supports through self elastic restoring force and holds end cover 1 guarantees to connect closely reliably, still because electrically conductive shell fragment 531 has certain elastic deformation, can improve the adaptability, and it is right to reduce the requirement of end cover 1 structure appearance, can realize electrically conductive shell fragment 531 with end cover 1's abundant contact, simple structure, convenient connection.

It should be noted that, in the arrangement of the conductive pin 521 and the conductive elastic piece 531, one or both of them may exist, and it can be understood that, according to the structural characteristics of the stator core 31 and the end cover 1, the technical effect brought by the existence of both of them is the best.

Furthermore, an accommodating groove is formed in one side, facing the circuit board 4, of the end cover 1; the conductive elastic piece 531 comprises a connecting section 5311, a bending section 5312 and a reverse bending section 5313, the connecting section 5311 extends from the circuit board 4 towards the end cover 1, the bending section 5312 extends from the end, far away from the circuit board 4, of the connecting section 5311 in a lateral bending manner, the reverse bending section 5313 extends from the end, far away from the connecting section 5311, of the bending section 5312 in a lateral bending manner towards the circuit board 4, the reverse bending section 5313 and the connecting section 5311 are arranged at intervals and respectively press two opposite side walls of the accommodating groove, and the bending section 5312 presses the bottom of the accommodating groove. So set up, electrically conductive shell fragment 531 by the holding tank location, electrically conductive shell fragment 531 compresses tightly two lateral walls and the tank bottom of holding tank, the increase electrically conductive shell fragment 531 with the area of contact of end cover 1 ensures to switch on the effect and connect stably, in addition, through buckling the setting and forming electrically conductive shell fragment 531 can also make the thickness dimension of electrically conductive shell fragment 531 need not set up too big, can satisfy simultaneously support the demand of holding two lateral walls of holding tank, save material.

In an embodiment of the present invention, the conductive elastic piece 531 is formed by stamping and bending a single piece of elastic metal sheet, and is easy to manufacture and low in cost.

The present invention does not limit the connection mode between the reactance element 51, the first conductive piece 52, the second conductive piece 53 and the circuit board 4, and can be a connection through a fixing piece, such as a bolt, a rivet, etc. in one embodiment of the present invention, the reactance element 51 is connected with the circuit board 4 by welding; in another embodiment of the present invention, the first conductive member 52 is connected to the circuit board 4 by welding; in another embodiment of the present invention, the second conductive member 53 is welded to the circuit board 4; the welding connection is material-saving, firm in connection and not easy to break, effective conduction is ensured, and the reliability of the conductive structure 5 is improved. Obviously, the above three embodiments can be combined alternatively and simultaneously, the technical effect brought by the existence is the best.

In this embodiment, the end cap 1 includes a first end cap 11 and a second end cap 12, and the two bearings 22 are correspondingly mounted on the first end cap 11 and the second end cap 12; stator module 3 with the integrative plastic envelope of first end cap 11 is in order to form the stator 7 of moulding plastics, circuit board 4 is located the stator 7 of moulding plastics is towards one side of second end cap 12, the periphery of second end cap 12 with the stator 9 of moulding plastics is connected, and the lid closes circuit board 4. Stator module 3 with 11 integrative plastic envelopes of first end cap are in order to form the stator 7 of moulding plastics, stator module 3 with 11 joint strength of first end cap is high, improves motor 100's structural strength, can improve motor 100's life, circuit board 4 locates mould plastics stator 7 orientation one side of second end cap 12, the periphery of second end cap 12 with mould plastics stator 9 and connect, the lid closes circuit board 4 can be right circuit board 4 forms effective protection, follows mould plastics stator 7 and go up will second end cap 12 is dismantled, can make circuit board 4 exposes, is convenient for circuit board 4's installation and dismantlement also are favorable to simultaneously reactance element 51 first electrically conductive piece 52 with the setting of second electrically conductive piece 53, mould plastics stator 7 circuit board 4 second end cap 12 sets gradually, assembles compactly, makes motor 100 simple structure, size reduction.

The utility model discloses an in the embodiment, stator module 3 with first end cover 11 passes through the integrative injection moulding of thermoplastic (BMC), BMC, bulk molding compound promptly, the internal unsaturated polyester bulk molding compound of often being called, its main raw materials are by GF (chopped glass fiber), UP (unsaturated resin), MD (filler) and the lumpy preimpregnation material that various additives formed through the intensive mixing, have good electrical property, mechanical properties, heat resistance, resistant chemical attack, adapt to various forming process again, can satisfy the requirement of various products to the performance, make the stator 7 that moulds plastics's shaping cycle is short, can satisfy the shaping requirement of complicated shape, dimensional stability is high, bulk molding compound proportion is lighter, still is favorable to alleviateing motor 100's weight. Of course, the stator assembly 3 with the first end cap 11 can also be formed by injection molding of other injection molding materials, and the utility model discloses do not limit this.

Further, referring to fig. 7 and 8 with emphasis, a mounting groove 71 is disposed on one side of the injection stator 7 facing the second end cap 12, a positioning structure 72 is disposed in the mounting groove 71, and the circuit board 4 is disposed in the mounting groove 71 and positioned by the positioning structure 92. With this arrangement, the motor 100 is compact and the circuit board 4 is stably mounted. In an embodiment, the positioning structure 72 includes three wire pins 721 and a positioning boss 722, the positioning boss 722 supports and limits the circuit board 4, one end of each wire pin 721 is connected to a winding, the other end of each wire pin 721 passes through a through hole on the circuit board 4 and is connected to the circuit board 4 by welding to conduct the winding and a control circuit of the circuit board 4, and the wire pins 721 also fix the circuit board 4, as shown in the drawing, the wire pins 721 are provided with three wire pins 721, and the three wire pins 721 are correspondingly connected to a three-phase coil winding.

In this embodiment, the reactance element 51 is disposed on one side of the circuit board 4 facing the second end cover 12, so that the reactance element 51 is exposed when the second end cover 12 is removed, and the reactance element 51 can be conveniently mounted and dismounted, the second conductive piece 53 is disposed on the same side as the reactance element 51, so that the second conductive piece 53 is closer to the second end cover 12 and can directly extend towards the second end cover 12, so as to conveniently achieve conduction between the reactance element 51 and the second end cover 12, similarly, the first conductive piece 52 is disposed on one side of the circuit board 4 away from the second end cover 12, the first conductive piece 52 and the stator core 31 are located on the same side of the circuit board 4 and are closer to each other, and the first conductive piece 52 can directly extend towards the stator core 31, so that the connection between the reactance element 51 and the stator core 31 is conveniently achieved, and the stator core 31 is disposed so that the stator core 31, the circuit board 4, the conductive structure 5 and the second end cover 12 are reliably connected to each other, and the assembly is compact, thereby ensuring the structural size of the motor 100 is reduced.

Further, referring to fig. 5, 7 and 8, a rib 73 is disposed on one side of the injection-molded stator 7 facing the second end cap 12, a groove 121 is disposed on one side of the second end cap 12 facing the injection-molded stator 7, the groove 121 is in interference fit with the rib 73, a limiting groove 731 is concavely disposed on the surface of the rib 73, and the second conductive member 53 is disposed along the limiting groove 931. In this way, the second conductive member 53 is limited by the limiting groove 731, the installation is stable, at least part of deformation of the second conductive member 53 can be performed in the limiting groove 731, interference between the protruding rib 73 and the groove 121 is avoided, the second end cap 12 and the injection molding stator 7 are connected by interference fit of the protruding rib 73 and the groove 121, and the second conductive member 53 is pressed between the injection molding stator 7 and the second end cap 12, so that the conduction between the second conductive member 53 and the second end cap 12 is realized. The assembly process of the motor 100 is generally: firstly, the stator assembly 3 and the first end cap 11 are subjected to integrated plastic package to form the injection molding stator 7, then the rotor assembly 2 is installed into the injection molding stator 7, then the circuit board 4 is installed (the rotor assembly 2 which is installed in the combined structure schematic diagram of the injection molding stator 7 and the circuit board 4 is hidden for convenient marking in fig. 8), and finally the second end cap 12 is installed to complete the assembly of the motor 100.

The utility model provides an electrical equipment, include as above motor 100, the concrete structure of motor 100 refers to above-mentioned embodiment, because the utility model discloses an electrical equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. The electrical equipment can be household appliances such as an air conditioner, a washing machine, a refrigerator and the like, and the utility model discloses do not do the restriction.

The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims (10)

1. An electric machine, comprising:

an end cap;

the stator assembly comprises a stator core and a winding wound on the stator core;

the rotor assembly is rotatably arranged relative to the stator assembly and comprises a rotor core, a rotating shaft penetrating through the rotor core and a bearing sleeved on the rotating shaft, and the bearing is arranged on the end cover;

the circuit board is electrically connected with the winding; and the number of the first and second groups,

the conductive structure comprises a reactance element, a first conductive piece and a second conductive piece which are all arranged on the circuit board, wherein the reactance element comprises a capacitor or an inductor, one end of the first conductive piece is connected with one end of the reactance element, the other end of the first conductive piece is connected with the stator core, one end of the second conductive piece is connected with the other end of the reactance element, and the other end of the second conductive piece is connected with the end cover.

2. The electric machine of claim 1 wherein there are two of said bearings and, accordingly, said end caps comprise a first end cap and a second end cap, said first end cap and said second end cap being conductively connected by a conductive member.

3. The motor of claim 1, wherein the first conductive member comprises a conductive pin, one end of the conductive pin is connected with the circuit board, and the other end of the conductive pin is in press connection with the stator core; and/or the presence of a gas in the gas,

the second conductive piece comprises a conductive elastic piece, one end of the conductive elastic piece is connected with the circuit board, and the other end of the conductive elastic piece is abutted against and conducted with the end cover.

4. The motor of claim 3, wherein the side of the end cap facing the circuit board is provided with a receiving groove;

the conductive elastic sheet comprises a connecting section, a bending section and a reverse bending section, the connecting section extends from the direction of the end cover towards the circuit board, the bending section extends from the side direction of one end of the circuit board away from the connecting section, the reverse bending section extends from the end of the connecting section towards the direction of the circuit board away from the connecting section, the reverse bending section and the connecting section are arranged at intervals and respectively press two opposite side walls of the accommodating groove, and the bending section presses the bottom of the accommodating groove.

5. The electric machine of claim 1, wherein said reactive element is soldered to said circuit board; and/or;

the first conductive member and/or the second conductive member are soldered to the circuit board.

6. The motor of claim 2, wherein the stator assembly and the first end cap are integrally molded to form an injection molded stator, the circuit board is disposed on a side of the injection molded stator facing the second end cap, a periphery of the second end cap is connected with the injection molded stator, and the circuit board is covered.

7. The motor of claim 6, wherein a side of the injection-molded stator facing the second end cover is provided with a mounting groove, a positioning structure is arranged in the mounting groove, and the circuit board is arranged in the mounting groove and positioned by the positioning structure.

8. An electrical machine according to claim 7, wherein the reactive element is provided on a side of the circuit board facing the second end cap,

the second conductive piece and the reactance element are arranged on the same side, and the first conductive piece is arranged on one side, away from the second end cover, of the circuit board.

9. The electric machine of claim 8, wherein the injection molded stator has a rib on a side facing the second end cap, and the second end cap has a groove on a side facing the injection molded stator, the groove being in interference fit with the rib;

the convex rib surface is concavely provided with a limiting groove, and the second conductive piece is arranged along the limiting groove.

10. An electrical apparatus, characterized in that it comprises an electric machine according to any one of claims 1 to 9.

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