Electric machines and electric appliances

Abstract

The application discloses a motor and an electrical equipment, and belongs to the technical field of motors. The motor comprises a shell, a stator assembly, a rotor assembly and a conductive assembly. The shell is provided with end covers at two ends. The stator assembly comprises a stator core, the stator core is fixedly arranged in the shell, and the rotor assembly is rotatably arranged in the stator core. The bearings of the rotating shaft are fixed through the end covers at the two ends of the shell. The two end covers are connected and conductive through the conductive part. Insulating supports are arranged on the outer circumferential wall of the shell. The distance between the conductive part and the stator core can be changed through the insulating supports. The thickness of the insulating supports can be determined according to actual product requirements, so that the equivalent capacitance formed between the two in the high-frequency common-mode circuit of the motor is changed, the impedance distribution of the shaft voltage loop is balanced, the potential at the two ends of the bearing is balanced, the effect of reducing the shaft voltage is achieved, the risk of electric corrosion is reduced, and the service life of the bearing and the operation reliability of the motor are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and an electric appliance. BACKGROUND

[0002] The common-mode voltage of the variable frequency control of the electric machine occurs due to the switching frequency converter, and the common-mode voltage is divided at both ends of the bearing under the distribution of the electrostatic capacity in the electric machine, forming the shaft voltage. When the amplitude of the shaft voltage is too high and exceeds the breakdown voltage of the oil film, the discharge forms a transient large current, which causes the electric corrosion of the bearing, thereby reducing the service life of the bearing and the reliability of the electric machine. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an electric machine capable of changing the capacitance between the conductive part and the stator core, balancing the potential at both ends of the bearing, and achieving the purpose of improving the shaft voltage of the electric machine.

[0004] The present application also provides an electric appliance comprising the above electric machine.

[0005] The electric machine according to the first aspect of the present application comprises a shell, a stator assembly, a rotor assembly and a conductive assembly, both ends of the shell are respectively provided with end covers; the stator assembly comprises a stator core, the stator core is fixedly arranged in the shell; the rotor assembly is rotatably arranged in the stator core, the rotor assembly comprises a rotor core and a rotating shaft penetrating the rotor core, both ends of the rotating shaft are respectively sleeved with bearings, and both bearings are fixedly arranged on the end covers at both ends; the conductive assembly comprises a conductive part and an insulating support, the insulating support extends along the axial direction of the shell and is fixedly connected to the outer peripheral wall of the shell, the conductive part is fixedly arranged on the side of the insulating support away from the shell, and both ends of the conductive part are respectively electrically connected to the end covers at both ends.

[0006] The electric machine according to the present application has at least the following beneficial effects:

[0007] The stator core of the motor is fixed in the shell, and the rotor core is rotatably arranged in the stator core, bearings of the rotating shaft are fixed through end covers at both ends of the shell, so that the rotor assembly can stably rotate, and an insulating support is arranged on the outer circumferential wall of the shell, a conductive piece is fixed on the side of the insulating support away from the shell, and both ends of the conductive piece are electrically connected with the end covers at both ends, so that the two end covers can be conductive, the distance between the conductive piece and the stator core can be changed through the insulating support, the thickness of the insulating support can be determined according to actual product requirements, the equivalent capacitance formed between the conductive piece and the stator core in the high-frequency common-mode circuit of the motor is changed, the impedance distribution of the shaft voltage loop is balanced, the potential at both ends of the bearing is balanced, the effect of reducing the shaft voltage is achieved, the risk of electric corrosion is reduced, and the service life of the bearing and the operation reliability of the motor are improved.

[0008] According to some embodiments of the present application, one of a recess and a protrusion is arranged on the side of the insulating support facing the shell, and the other of the recess and the protrusion is arranged on the outer circumferential wall of the shell.

[0009] According to some embodiments of the present application, the recess is a groove, and opposite side walls of the groove are respectively provided with limiting blocks, and the protrusion is a protrusion, and both side walls of the protrusion are respectively provided with limiting grooves matched with the limiting blocks.

[0010] According to some embodiments of the present application, the protrusion is arranged on the insulating support, and the groove is arranged on the shell.

[0011] According to some embodiments of the present application, a fixing groove is arranged on the side of the insulating support away from the protrusion, and the conductive piece is fixed in the fixing groove.

[0012] According to some embodiments of the present application, the conductive piece is connected with the inner wall of the fixing groove through adhesion or interference fit.

[0013] According to some embodiments of the present application, the shell is a plastic package body wrapped around the stator core, the groove is integrally formed with the shell, and the protrusion is integrally formed with the insulating support.

[0014] According to some embodiments of the present application, one end of the shell is provided with an opening, the shell is provided with a first end cover covering the opening, a second end cover is fixed at the end of the shell away from the opening, the insulating support is provided with an extension bent towards the second end cover, and one end of the conductive piece connected with the second end cover is fixed in the extension.

[0015] According to some embodiments of the present application, the end of the shell away from the opening is formed with a containing groove in communication with the groove, and the extension is arranged in the containing groove.

[0016] According to some embodiments of the present application, the electrically conductive member is connected to the end cap by welding, riveting or interference fit.

[0017] The electric appliance according to the second aspect of the present application comprises the electric machine according to the first aspect of the present application.

[0018] The electric appliance according to the present application has at least the following beneficial effects:

[0019] The electric appliance uses the electric machine according to the above embodiments, and the electric machine can change the distance between the electrically conductive member and the stator core through the insulating support. The thickness of the insulating support can be determined according to the actual product requirements, so as to change the equivalent capacitance formed between the electrically conductive member and the stator core in the high-frequency common-mode circuit of the electric machine, balance the impedance distribution of the shaft voltage loop, balance the electric potential at both ends of the bearing, reduce the shaft voltage, reduce the risk of electric corrosion, prolong the service life of the bearing, and improve the operation reliability of the electric appliance.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of an electric machine according to an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the axial cross-sectional structure of an electric machine according to an embodiment of the present application;

[0023] Figure 3 is a simplified equivalent common-mode circuit diagram of an electric machine according to an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of the enlarged structure at A in Figure 1 of the present application;

[0025] Figure 5 is a schematic diagram of the structure of an insulating support according to an embodiment of the present application;

[0026] Figure 6 is a schematic diagram of the top view of the structure of an insulating support according to an embodiment of the present application;

[0027] Figure 7 is a schematic diagram of the structure of a housing according to an embodiment of the present application;

[0028] Figure 8 is a schematic diagram of the radial cross-sectional structure of a housing according to an embodiment of the present application;

[0029] Figure 9 is a schematic diagram of the enlarged structure at B in Figure 8 of the present application.

[0030] Reference signs:

[0031] Housing 100; first end cover 110; second end cover 120; opening 130; recess 140; groove 141; first arc surface 1411; limiting block 142; accommodating groove 150; second inclined surface 151; heat dissipation rib 160;

[0032] Stator assembly 200; stator core 210;

[0033] Rotor assembly 300; rotor core 310; rotating shaft 320; bearing 321;

[0034] Conductive assembly 400; conductive piece 410; insulating support 420; protrusion 421; limiting groove 4211; second arc surface 4212; fixing groove 422; extension section 423; first inclined surface 4231; protruding part 430;

[0035] Motor 1000. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same reference numerals throughout the several views. The embodiments described below are exemplary only, and are not intended to be limiting of the present application.

[0037] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "axial", "radial", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, if there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0039] In the description of the present application, it needs to be noted that the words such as setting, mounting, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all embodiments.

[0041] Referring to Figure 1 and Figure 2 As shown in the figures, the motor 1000 provided by the embodiment of the present application is a brushless motor, which specifically comprises a shell 100, a stator assembly 200 and a rotor assembly 300. The stator assembly 200 comprises a stator core 210 and windings (not shown in the figure), the windings are wound around the stator core 210, and the stator core 210 is fixed in the shell 100. The rotor assembly 300 comprises a rotor core 310 and a rotating shaft 320, the rotating shaft 320 is connected to the center of the rotor core 310 and penetrates the rotor core 310, the rotor core 310 is provided with magnetic tiles (not shown in the figure), the rotor core 310 is rotatably arranged in the stator core 210, and the two ends of the rotating shaft 320 are respectively sleeved with bearings 321, the two bearings 321 are respectively fixed on the end covers at the two ends, and the rotating shaft 320 is supported by the two bearings 321 at the two ends, so that the rotor assembly 300 can stably operate.

[0042] Referring to Figure 1 and Figure 2 As shown in the figures, the motor 1000 provided by the embodiment of the present application is a brushless motor, which specifically comprises a shell 100, a stator assembly 200 and a rotor assembly 300. The stator assembly 200 comprises a stator core 210 and windings (not shown in the figure), the windings are wound around the stator core 210, and the stator core 210 is fixed in the shell 100. The rotor assembly 300 comprises a rotor core 310 and a rotating shaft 320, the rotating shaft 320 is connected to the center of the rotor core 310 and penetrates the rotor core 310, the rotor core 310 is provided with magnetic tiles (not shown in the figure), the rotor core 310 is rotatably arranged in the stator core 210, and the two ends of the rotating shaft 320 are respectively sleeved with bearings 321, the two bearings 321 are respectively fixed on the end covers at the two ends, and the rotating shaft 320 is supported by the two bearings 321 at the two ends, so that the rotor assembly 300 can stably operate.

[0043] Referring to Figure 1 and Figure 2 As shown in the figures, the motor 1000 provided by the embodiment of the present application is a brushless motor, which specifically comprises a shell 100, a stator assembly 200 and a rotor assembly 300. The stator assembly 200 comprises a stator core 210 and windings (not shown in the figure), the windings are wound around the stator core 210, and the stator core 210 is fixed in the shell 100. The rotor assembly 300 comprises a rotor core 310 and a rotating shaft 320, the rotating shaft 320 is connected to the center of the rotor core 310 and penetrates the rotor core 310, the rotor core 310 is provided with magnetic tiles (not shown in the figure), the rotor core 310 is rotatably arranged in the stator core 210, and the two ends of the rotating shaft 320 are respectively sleeved with bearings 321, the two bearings 321 are respectively fixed on the end covers at the two ends, and the rotating shaft 320 is supported by the two bearings 321 at the two ends, so that the rotor assembly 300 can stably operate.

[0043] Referring to Figure 1 and Figure 2 As shown in the figures, the motor 1000 provided by the embodiment of the present application is a brushless motor, which specifically comprises a shell 100, a stator assembly 200 and a rotor assembly 300. The stator assembly 200 comprises a stator core 210 and windings (not shown in the figure), the windings are wound around the stator core 210, and the stator core 210 is fixed in the shell 100. The rotor assembly 300 comprises a rotor core 310 and a rotating shaft 320, the rotating shaft 320 is connected to the center of the rotor core 310 and penetrates the rotor core 310, the rotor core 310 is provided with magnetic tiles (not shown in the figure), the rotor core 310 is rotatably arranged in the stator core 210, and the two ends of the rotating shaft 320 are respectively sleeved with bearings 321, the two bearings 321 are respectively fixed on the end covers at the two ends, and the rotating shaft 320 is supported by the two bearings 321 at the two ends, so that the rotor assembly 300 can stably operate.

[0044] It should be noted that the conductive component 410 can be fixedly connected to the first end cap 110 and the second end cap 120 by welding, or the conductive component 410 can be fixedly connected to the first end cap 110 and the second end cap 120 by riveting by providing connection holes at both ends. Alternatively, the conductive component 410 can be connected to the first end cap 110 and the second end cap 120 by interference fit. For example, the first end cap 110 can be connected to the opening 130 of the housing 100 while simultaneously pressing the conductive component 410 together to achieve a fixed connection. Alternatively, one end of the conductive component 410 can be interference-fitted to the first end cap 110, and the other end can be riveted to the second end cap 120; the specific method is not limited.

[0045] Considering that the input of motor 1000 is generated by a high-frequency carrier signal, motor 1000 has a high-frequency common-mode voltage, and stray capacitance will be induced at high frequencies, forming a closed loop. The loop passes through bearing 321, thus forming a high-frequency common-mode circuit. Under the effect of the electrostatic capacitance distribution inside motor 1000, this common-mode voltage is divided across the inner and outer rings of bearing 321, forming a shaft voltage. When the shaft voltage amplitude is too high and exceeds the breakdown voltage of the oil film, a momentary large current discharge will be generated, causing electro-corrosion of bearing 321. Electro-corrosion of bearing 321 is an irreversible phenomenon, which will reduce the life of bearing 321 and cause noise generation.

[0046] Reference Figure 3 As shown, Figure 3 To obtain the simplified equivalent common-mode circuit diagram of the shaft voltage of motor 1000, from... Figure 3 As can be seen, the common-mode voltage of motor 1000 is V1, the equivalent capacitance between the end cover and the ground wire is Cn1, the equivalent capacitance between the shaft 320 and the end cover is Cb1, and the equivalent capacitance between the shaft 320 and the ground wire is Csn1. The two ends of bearing 321 are in the form of a bridge circuit. When the impedance at both ends of bearing 321 reaches bridge balance, the voltage drop across bearing 321 is theoretically zero. Therefore, in this embodiment of the invention, the capacitance formed by the stator core and the conductive component 410 is changed by adjusting the distance between them. The calculation formula is C = ε * S / d, where C is the capacitance value, ε is the dielectric constant, S is the relative area of ​​the conductors, and d is the conductor distance. This method reduces the voltage drop across bearing 321.

[0047] Reference Figure 2 As shown, it can be understood that the insulating bracket 420 is made of a rigid insulating material, such as plastic or ceramic, which is not easily deformed, ensuring the stability of the distance between the conductive element 410 and the stator core 210. The insulating bracket 420 is fixedly connected to the outer peripheral wall of the housing 100, and the conductive element 410 is fixedly connected to the insulating bracket 420, so that the conductive element 410 is separated from the outer peripheral wall of the housing 100 by a certain distance. From Figure 2As can be seen, the stator core 210 is integrally formed with the shell 100 by plastic encapsulation. After the addition of the insulating support 420, the distance between the conductive member 410 and the stator core 210 along the radial direction of the shell 100 also changes. In combination with the above formula C = ε * S / d, it can be understood that, in the case where the dielectric constant ε and the relative area S of the conductor remain unchanged, the equivalent capacitance formed between the conductive member 410 and the stator core 210 will change. The greater the thickness h of the insulating support 420, the greater the distance between the conductive member 410 and the stator core 210, and the smaller the equivalent capacitance. Conversely, the smaller the thickness h of the insulating support 420, the smaller the distance between the conductive member 410 and the stator core 210, and the greater the equivalent capacitance.

[0048] It should be noted that, before the assembly of the insulating support 420, the distance requirement between the conductive member 410 and the stator core 210 can be determined according to different electromagnetic and structural requirements of the motor 1000, so as to determine the preferred thickness h of the insulating support 420. In this way, after the assembly of the insulating support 420 is completed, the equivalent capacitance between the conductive member 410 and the stator core 210 is preset, so as to balance the impedance distribution of the shaft voltage circuit, achieve the potential balance at both ends of the bearing 321, and achieve the effect of reducing the shaft voltage. In the optimal thickness h embodiment, the shaft voltage can even be eliminated, effectively reducing the risk of electrical corrosion, avoiding noise caused by electrical corrosion of the bearing 321, and improving the service life of the bearing 321 and the operation reliability of the motor 1000.

[0049] Referring to Figure 2 It can be understood that the thickness h of the insulating support 420 is not consistent for different motor 1000 models. The insulating support 420 with different thickness h is selected and assembled according to actual application requirements, that is, the thickness h of the insulating support 420 is not unique, and the thickness h of the insulating support 420 is not limited in the embodiment. It should be noted that, since the conductive member 410 needs to be connected to the end covers at both ends, the conductive member 410 and the insulating support 420 are arranged in the axial direction of the shell 100, and the insulating support 420 can be fixed to the outer surface of the shell 100 by adhesion or other means.

[0050] Referring to Figure 1 and Figure 5 As shown in the figures, the outer peripheral wall of the shell 100 is provided with a recess 140, and the side of the insulating support 420 facing the shell 100 is provided with a protrusion 430. The insulating support 420 and the shell 100 are positioned by the cooperation of the recess 140 and the protrusion 430. For example, the recess 140 can be a clamping groove formed in the outer peripheral wall of the shell 100, and the protrusion 430 can be a buckle formed on the side wall of the insulating support 420. The insulating support 420 and the shell 100 are fixed by positioning and cooperating the buckle and the clamping groove, which is simple to assemble.

[0051] It should be noted that in some embodiments, the convex portion 430 can also be arranged on the outer peripheral wall of the shell 100, and the concave portion 140 is arranged on the side wall of the insulating support 420, and the positioning and matching of the convex portion 430 and the concave portion 140 can also be achieved; the specific form of the convex portion 430 and the concave portion 140 is not limited, and the effect of fixing the insulating support 420 can be achieved by matching the convex portion 430 and the concave portion 140. The convex portion 430 and the concave portion 140 can be fixedly connected by bonding, clamping, interference fit and the like, to ensure reliable installation of the conductive part 410.

[0052] Referring to Figure 7 It is shown that in the embodiment, the groove 141 is arranged on the outer peripheral wall of the shell 100, and the groove 141 extends along the axial direction of the shell 100. The groove 141 and the shell 100 can be integrally injection molded, which is simple to manufacture. Figure 7 In the example shown, the groove 141 is arranged between the heat dissipation ribs 160 on the outer peripheral wall of the shell 100. In combination with Figure 5 and Figure 6 It can be understood that Figure 6 It is shown that the insulating support 420 is provided with a protrusion 421 on the side facing the shell 100, and the protrusion 421 extends along the length direction of the insulating support 420. The protrusion 421 and the insulating support 420 are integrally injection molded, so that the matching of the protrusion 421 and the groove 141 is more reliable. In the embodiment, the protrusion 421 can be bonded in the groove 141 by glue, so as to achieve the purpose of fixing the insulating support 420; or the protrusion 421 can be fixed by interference fit, which is simple to assemble.

[0053] Referring to Figure 8 and Figure 9 It is shown that the cross section of the groove 141 is substantially U-shaped, and the groove 141 is provided with a limiting block 142 on each of the opposite side walls in the width direction. The two limiting blocks 142 are formed at one end of the side wall of the groove 141 away from the bottom wall, and the two limiting blocks 142 respectively extend along the length direction of the groove 141. Figure 9 It can be understood from Figure 9 that the two limiting blocks 142 are arranged opposite to the slot position, so that the slot of the groove 141 is narrower relative to the bottom of the groove 141. In combination with Figure 6As shown, the two side walls of the protrusion 421 along the width direction are respectively provided with limiting grooves 4211, and the limiting grooves 4211 on the two sides are matched with the two limiting blocks 142 in the groove 141. When the protrusion 421 is inserted into the groove 141, the limiting blocks 142 and the limiting grooves 4211 are matched to play a guiding role, and at the same time, the protrusion 421 can be limited from being separated from the groove 141 along the slot direction, playing a mortise effect, and the connection is more stable. It should be noted that the limiting block 142 and the side wall of the groove 141 are transitioned through the first arc surface 1411, the side wall of the limiting groove 4211 and the side wall of the protrusion 421 are transitioned through the second arc surface 4212, and the first arc surface 1411 of the limiting block 142 and the second arc surface 4212 of the limiting groove 4211 are in abutment, which is beneficial to reduce friction and facilitate assembly.

[0054] Referring to Figure 2 As shown, it can be understood that after the insulating support 420 is assembled in place with the shell 100, the protrusion 421 is matched with the groove 141 for fastening, preventing the insulating support 420 from being deviated along the radial direction of the motor 1000, effectively maintaining the stability of the distance between the conductive part 410 and the stator core 210, ensuring the impedance distribution balance of the shaft voltage circuit, achieving the effect of effectively reducing the shaft voltage, and improving the service life of the bearing 321 and the operation reliability of the motor 1000.

[0055] Referring to Figure 5 and Figure 7 As shown, it should be noted that when assembling, the protrusion 421 needs to be inserted from the upper end of the groove 141, and then slide along the groove 141 from top to bottom until the protrusion 421 is completely inserted into the groove 141, so as to realize the assembly of the insulating support 420 and the shell 100, without relying on glue or other fasteners for fixation, the structure is stable and reliable, and the insulating support 420 is effectively prevented from loosening.

[0056] Referring to Figure 5 and Figure 6 As shown, the side of the insulating support 420 away from the protrusion 421 is provided with a fixing groove 422, the fixing groove 422 is integrally injection molded with the insulating support 420, the fixing groove 422 extends along the length direction of the insulating support 420, the conductive part 410 is installed in the fixing groove 422, the shape and size of the fixing groove 422 are set according to the conductive part 410, and the fixing groove 422 plays a limiting role on the conductive part 410.

[0057] In some embodiments, the conductive part 410 can be bonded with the fixing groove 422 through glue, or can be connected with the fixing groove 422 through interference fit. In combination with Figure 4It can be understood that the insulating bracket 420 cooperates with the conductive component 410 through the fixing groove 422, so that both sides of the conductive component 410 are limited, the installation of the conductive component 410 is more stable, and the conductive component 410 is prevented from loosening and affecting the distance between it and the stator core 210.

[0058] Reference Figure 2 As shown, when the first end cap 110 covers the opening 130, it extends to the outer peripheral wall of the housing 100, facilitating connection with the lower end of the conductive element 410. The upper end of the conductive element 410 needs to be bent and extend towards the rotating shaft 320, allowing the upper end of the conductive element 410 to connect with the second end cap 120. Figure 4 and Figure 5 As shown, it can be understood that the upper end of the insulating bracket 420 is provided with an extension section 423 that bends toward the second end cover 120, and the fixing groove 422 is further provided along the extension section 423 so that the upper end of the conductive component 410 can be fixed on the extension section 423, thereby improving the connection stability.

[0059] Reference Figure 7 As shown, in some embodiments, a receiving groove 150 is formed at the end of the housing 100 away from the opening 130. The receiving groove 150 is integrally injection molded from the housing 100. The receiving groove 150 matches the extension section 423, allowing the extension section 423 to be housed within the receiving groove 150, preventing the upper end of the insulating bracket 420 from protruding from the end face of the housing 100, thus making the assembly more reliable. It should be noted that since the receiving groove 150 is connected to the groove 141, after the insulating bracket 420 is assembled into place by the engagement of the protrusion 421 with the groove 141, the extension section 423 can be fixed by entering the receiving groove 150 without the need for additional connecting structures, making assembly simple.

[0060] Refer to 5 and Figure 7 As shown, in some embodiments, the end of the extension section 423 is provided with a first inclined surface 4231, and the receiving groove 150 is provided with a second inclined surface 151. The first inclined surface 4231 and the second inclined surface 151 are inclined in the same direction, and the specific inclination angle is not limited. When the extension section 423 is assembled in the receiving groove 150, the first inclined surface 4231 and the second inclined surface 151 abut against each other for positioning and engagement, so that the extension section 423 and the receiving groove 150 are more closely fitted and the connection stability is higher.

[0061] An embodiment of the present invention also provides an electrical device (not shown in the accompanying drawings), which may be a household appliance such as an air conditioner, and the electrical device uses the motor 1000 of the above embodiment as a driving component.

[0062] Reference Figure 1As shown, the insulating support 420 is added to the outer peripheral wall of the shell 100, the conductive piece 410 is fixed to the side of the insulating support 420 away from the shell 100, the two ends of the conductive piece 410 are respectively electrically connected with the two end covers, the two end covers can be conducted, the insulating support 420 is fixedly connected with the outer peripheral wall of the shell 100, the conductive piece 410 is fixedly connected with the insulating support 420, the conductive piece 410 is separated from the outer peripheral wall of the shell 100 by a certain distance, the distance between the conductive piece 410 and the stator core 210 is changed through the insulating support 420, according to different requirements of the electromagnetic and structural schemes of the motor 1000, the distance requirement between the conductive piece 410 and the stator core 210 can be determined, thereby the preferred thickness of the insulating support 420 is determined, so that after the insulating support 420 is assembled, the equivalent capacitance between the conductive piece 410 and the stator core 210 is preset, thereby the impedance distribution of the shaft voltage circuit is balanced, the potential balance of the two ends of the bearing 321 is realized, the effect of reducing the shaft voltage is achieved, the risk of electric corrosion is effectively reduced, the service life of the bearing 321 and the operation reliability of the motor 1000 are improved, and the operation of the electrical equipment is more stable.

[0063] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. An electric machine characterized in that, The application relates to a motor. The motor comprises a shell provided with end covers at two ends, a stator assembly, a rotor assembly and a conductive assembly. The stator assembly comprises a stator core fixedly arranged in the shell. The rotor assembly is rotatably arranged in the stator core and comprises a rotor core and a rotating shaft arranged in the rotor core. Two ends of the rotating shaft are respectively sleeved with bearings, and the two bearings are fixedly arranged at the two end covers. The conductive assembly comprises a conductive piece and an insulating support. The insulating support extends along the axial direction of the shell and is fixedly connected to the outer peripheral wall of the shell. Two ends of the conductive piece are respectively electrically connected to the end covers.

2. The electric machine of claim 1, wherein, The insulating support is provided with a protrusion on the side facing the shell.

3. The electric machine of claim 1, wherein, The outer peripheral wall of the shell is provided with a recess.

4. The electric machine of claim 3, wherein, The recess is a groove, and opposite side walls of the recess are respectively provided with limiting blocks.

5. The electric machine of claim 1, wherein, The protrusion is a convex part, and the two side walls of the protrusion are respectively provided with limiting grooves matched with the limiting blocks.

6. An electric appliance characterized by The insulating support is provided with a fixing groove on the side away from the protrusion. The conductive piece is fixedly arranged in the fixing groove. The shell is a plastic package body wrapped around the stator core. The recess and the shell are integrally formed, and the protrusion and the insulating support are integrally formed. When the protrusion is inserted into the recess from the upper end of the recess and then slides along the recess from top to bottom until the protrusion is completely inserted into the recess, the limiting blocks and the limiting grooves can limit the protrusion from separating from the recess along the slot direction of the recess. The conductive piece is connected with the inner wall of the fixing groove through adhesion or interference fit. One end of the shell is provided with an opening. The shell is provided with a first end cover covering the opening. The shell is fixedly provided with a second end cover away from the opening. The insulating support is provided with an extension section bent towards the second end cover. One end of the conductive piece connected with the second end cover is fixedly arranged in the extension section. The shell is formed with a containing groove communicated with the recess at the end away from the opening. The extension section is arranged in the containing groove. The conductive piece is connected with the end cover through welding, riveting or interference fit. The motor comprises the motor as claimed in any one of claims 1 to 5.

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