Motor and household appliance

Abstract

The utility model provides a motor and a household electrical appliance. The motor comprises a fixed assembly; the rotating assembly can be rotatably mounted on the fixed assembly and comprises a rotor shaft; the bearing is installed on the fixing assembly and used for supporting and installing the rotor shaft, the bearing comprises an inner ring and an outer ring, the rotor shaft is sleeved with the inner ring, and the outer ring is connected with the fixing assembly; and the electric corrosion prevention assembly is installed on the fixed assembly and comprises an adjusting capacitor, and the adjusting capacitor is connected to the fixed assembly or the rotating assembly and can adjust the voltage difference between the fixed assembly and the rotating assembly. According to the motor provided by the invention, the voltage difference between the rotating assembly and the fixed assembly can be reduced by adjusting the voltage, so that the voltage difference between the inner ring and the outer ring of the bearing can be reduced, the electric corrosion of the bearing is relieved, and the service life of the bearing is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor manufacturing, in particular to a motor and a household appliance. BACKGROUND

[0002] In the working process of a DC motor using a PWM (Pulse-Width Modulation) frequency converter, three-phase alternating current is simulated by switching actions of electronic components. Since the instantaneous values of the three-phase voltage are always asymmetric in phase, a common-mode voltage (i.e. the vector sum of the three instantaneous values) is generated. Due to the different electrostatic capacities inside the motor, the common-mode voltage is divided into two parts, one on the inner ring side and the other on the outer ring side of the bearing, resulting in a potential difference between the inner ring and the outer ring of the bearing, which is called "bearing voltage". Since the oil film thickness (0.1-2 μm) of the lubricating grease of the bearing is very thin after the bearing is running, when the value of the bearing voltage exceeds the critical breakdown voltage of the oil film of the bearing lubricating grease, bearing current (discharge current) will flow, causing damage (electrical erosion) to the metal channel surface of the bearing. The electrical erosion of the bearing affects the service life of the motor and is also an important factor causing noise of the motor.

[0003] Therefore, how to improve the electrical erosion of the bearing has become a problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the problem of electrical erosion of the bearing of the motor in the prior art or related art.

[0005] Therefore, the first object of the utility model is to provide a motor.

[0006] The second object of the utility model is to provide a household appliance.

[0007] To achieve the above object, the utility model provides a motor in the first aspect of embodiments, which comprises a fixing assembly, a rotating assembly rotatably installed on the fixing assembly and comprising a rotor shaft, a bearing installed on the fixing assembly and used for supporting the rotor shaft, the bearing comprising an inner ring and an outer ring, the inner ring being sleeved on the rotor shaft and the outer ring being connected with the fixing assembly, and an anti-electrical erosion assembly installed on the fixing assembly and comprising an adjusting capacitor, the adjusting capacitor being connected with the fixing assembly or the rotating assembly and capable of adjusting the voltage difference between the fixing assembly and the rotating assembly.

[0008] The motor provided by the embodiment of the utility model, comprising fixing assembly, rotating assembly, bearing and anticorrosion assembly, wherein, fixing assembly refers to stator and its related parts (for example, shell), which is fixed opposite to rotating part, rotating assembly is rotatably installed on fixing assembly, bearing is installed on fixing assembly and can support rotor shaft, bearing comprises inner ring and outer ring, inner ring is sleeved on rotor shaft and rotates with rotor shaft, outer ring is connected with fixing assembly, and outer ring is fixed relative to rotor shaft with fixing assembly. Wherein, anticorrosion assembly is installed on fixing assembly, and the adjusting capacitor in anticorrosion assembly can adjust the voltage (or voltage difference) on fixing assembly, so as to adjust the voltage difference between fixing assembly and rotating assembly. It can be understood that the potential difference between fixing assembly and rotating assembly is relatively stable due to the design of motor and electromagnetic induction relationship, therefore, during the manufacturing process of motor, an anticorrosion assembly is arranged on fixing assembly, and the voltage of fixing assembly can be adjusted to offset the potential difference between fixing assembly and rotating assembly. Wherein, for different characteristics of motor, adjusting capacitors with different capacities can be arranged to compensate the voltage value generated by fixing assembly.

[0009] The motor provided by the present application can reduce the voltage difference between rotating assembly and fixing assembly by adjusting voltage, so as to reduce the voltage difference between inner ring and outer ring of bearing, alleviate bearing corrosion, and improve the service life of bearing.

[0010] Wherein, fixing assembly is equipotential body, that is, the potential of each part of fixing assembly is consistent, and there is no potential difference in the inside.

[0011] In some embodiments, optionally, the fixing assembly comprises: a front end cover and a rear end cover; a stator assembly installed between the front end cover and the rear end cover, the stator assembly comprising a stator core, the stator core, the front end cover and the rear end cover being in equipotential connection; a first end of the adjusting capacitor being connected with one of the stator core, the front end cover and the rear end cover, and a second end of the adjusting capacitor being connected with another one of the stator core, the front end cover and the rear end cover.

[0012] In this embodiment, the fixing assembly includes a front end cover, a rear end cover and a stator assembly, and the stator assembly includes a stator core. The stator core, the front end cover and the rear end cover are connected at the same potential, so that the fixing assembly forms an equipotential body, and no potential difference exists between the stator core, the front end cover and the rear end cover, thereby avoiding the generation of current flow between the stator core, the front end cover and the rear end cover, and reducing the risk of electro-erosion of the stator assembly. Meanwhile, one of the stator core, the front end cover and the rear end cover is connected to a first end of the adjusting capacitor, and the other of the stator core, the front end cover and the rear end cover is connected to a second end of the adjusting capacitor, so that the adjusting capacitor is connected to the fixing assembly, and the voltage of the fixing assembly can be adjusted, so as to eliminate the pressure difference between the fixing assembly and the rotor assembly as much as possible, and avoid the pressure difference between the inner ring and the outer ring of the bearing, so as to prevent the lubricating grease oil film from being broken.

[0013] In this embodiment, the front end cover and the rear end cover are both conductive members. Optionally, the front end cover and the rear end cover are both metal members.

[0014] In some embodiments, the fixing assembly further includes a first connecting member for connecting the front end cover and the rear end cover, and the first end of the adjusting capacitor is connected to the stator core, and the second end of the adjusting capacitor is connected to the rear end cover.

[0015] In this embodiment, the fixing assembly further includes a first connecting member for connecting the front end cover and the rear end cover, and the two ends of the adjusting capacitor are respectively connected to the stator core and the rear end cover. The first connecting member is a conductive member for connecting the front end cover and the rear end cover, and can balance the potential difference between the front end cover and the rear end cover, so as to avoid the discharge current of the housing assembly flowing through the housing assembly, and improve the safety of the motor. Meanwhile, the two ends of the adjusting capacitor are respectively connected to the stator core and the rear end cover, and the potential difference between the housing assembly and the stator core tends to be the same through the self-charging and discharging process of the adjusting capacitor. It can be seen that the first connecting member and the adjusting capacitor can avoid the generation of discharge current of the fixing assembly, prevent the discharge current from damaging the components in the motor, and improve the service life of the motor.

[0016] In some embodiments, the anti-electro-erosion assembly includes a circuit board on which the adjusting capacitor is mounted, and a second connecting member mounted on the circuit board and used for connecting the second end of the adjusting capacitor and the rear end cover.

[0017] In this embodiment, the anti-electro-erosion assembly includes a circuit board and a second connecting member, and the adjusting capacitor is mounted on the circuit board and constitutes the anti-electro-erosion assembly together with the second connecting member, that is, the circuit board and the second connecting member are integrated on the circuit board, which simplifies the assembly mode of the anti-electro-erosion assembly and facilitates the inspection and maintenance of the product by maintenance personnel. Meanwhile, the second connecting member connects the second end of the adjusting capacitor and the rear end cover, which can improve the stability of the connection. Compared with the direct wire connection mode, the second connecting member can provide more reliable electrical connection.

[0018] In some embodiments, the second connecting member is optionally an electrically conductive member.

[0019] In some embodiments, an electrically conductive structure is arranged on the stator core, the circuit board is connected with the electrically conductive structure, and the first end of the adjusting capacitor is connected with the circuit board to be connected through the circuit board and the stator core.

[0020] In this embodiment, the electrically conductive structure is arranged on the stator core, and the circuit board is connected with the electrically conductive structure, and the first end of the adjusting capacitor is connected with the circuit board, thereby realizing the electrical connection between the adjusting capacitor and the stator core, and the potential difference between the stator core and the housing assembly can be controlled by the adjusting capacitor, so as to avoid the discharge current generated by the potential difference from affecting the service life of the motor.

[0021] In some embodiments, the first connecting member and / or the second connecting member is optionally an electrically conductive metal member.

[0022] In this embodiment, the first connecting member is an electrically conductive metal member, and the second connecting member is also an electrically conductive metal member. For example, copper or aluminum metal with low resistivity is used as the material of the electrically conductive metal member, and the electrically conductive metal member can maximize the reduction of voltage difference at the connection site by virtue of its low resistance characteristics.

[0023] Of course, the first connecting member and the second connecting member can also be non-metallic electrically conductive members, such as graphite, carbon nanotubes, and graphene.

[0024] In some embodiments, the first connecting member and / or the second connecting member is optionally a metal spring.

[0025] In this embodiment, the first connecting member is a metal spring, and the second connecting member is also a metal spring. The metal spring has elasticity, and can be tightly attached to the connected part by its elastic deformation during installation, thereby improving the stability of the connection. At the same time, the metal spring can be flexibly designed and deformed according to the space layout inside the motor, which not only meets the connection requirements, but also facilitates the miniaturization design of the motor.

[0026] In some embodiments, the anti-electric corrosion assembly is optionally mounted on the stator assembly, and the stator assembly is provided with a positioning structure for positioning the second connecting member.

[0027] In this embodiment, the anti-electric corrosion assembly is mounted on the stator assembly, and the positioning structure on the stator core can limit the position of the second connecting member, so that the installation of the second connecting member is facilitated, and the accuracy of the installation position of the second connecting member is improved, thereby facilitating the electrically conductive connection between the anti-electric corrosion assembly and the rear end cover.

[0028] In some embodiments, the positioning structure is optionally a positioning groove, and the second connecting member is an electrically conductive plate, at least part of which is limited and installed in the positioning groove.

[0029] In this embodiment, at least part of the conductive plate is limitedly installed at the positioning groove, so that the conductive plate can be effectively constrained during the operation of the motor, and displacement or shaking of the conductive plate is prevented. The positioning groove plays a limiting role, and the limiting function of the positioning groove can enable the conductive plate to be firmly maintained at the target position. Meanwhile, the positioning groove is provided on the stator core, which can reduce the risk of short circuit compared with the positioning protrusion. The positioning groove does not contact other conductive components, thereby improving the safety of the motor. Meanwhile, the risk of workers being scratched by the protrusion during assembly of the second connecting piece is avoided, thereby improving the assembly safety.

[0030] In some embodiments, optionally, the stator assembly further comprises: a plurality of wiring terminals; and a stator winding provided on the stator core and connected to the plurality of wiring terminals.

[0031] In this embodiment, the stator assembly further comprises a plurality of wiring terminals and a stator winding provided on the stator core and connected to the plurality of wiring terminals. The stator winding can be powered through the wiring terminals.

[0032] In some embodiments, optionally, the plurality of wiring terminals are provided on the anti-electro-erosion assembly. Specifically, the plurality of wiring terminals can be provided on the circuit board of the anti-electro-erosion assembly.

[0033] By providing the wiring terminals on the anti-electro-erosion assembly, the integration of the wiring terminals and the anti-electro-erosion assembly is achieved, so as to reduce the number of components and make the internal structure of the motor simpler.

[0034] In some embodiments, optionally, the stator assembly further comprises: a plurality of wiring terminals provided on the stator core; and a stator winding provided on the stator core and connected to the plurality of wiring terminals; wherein the plurality of wiring terminals are provided on the anti-electro-erosion assembly.

[0035] In this embodiment, the plurality of wiring terminals are directly provided on the stator core or the plastic package of the stator core, so as to facilitate wiring with the stator winding.

[0036] In some embodiments, optionally, the stator assembly further comprises: a plastic package, the stator core is arranged in the plastic package, the front end cover and the rear end cover are arranged on opposite sides of the plastic package; and the anti-electro-erosion assembly is arranged in a space surrounded by the front end cover, the rear end cover and the plastic package. By arranging the anti-electro-erosion assembly in the cavity space formed by the plastic package, the front end cover and the rear end cover, the safety is high, and the use of the motor assembly is not affected.

[0037] Further, a limiting groove is provided on the plastic package, and a limiting protrusion is provided on the stator core. The stator core and the rear end cover are positioned and connected through the limiting groove and the limiting protrusion.

[0038] Optionally, the rotating assembly further comprises a rotor core, and the rotor shaft is mounted on the rotor core and can rotate with the rotor core.

[0039] The second aspect of the embodiments of the utility model provides a kind of household appliance, including the motor of any one of the first aspect of embodiment.

[0040] Since the household appliance provided by the second aspect of the embodiments of the utility model includes the motor of any one of the first aspect of embodiment, the household appliance has all beneficial effects of the motor of any one of the first aspect of embodiment, which will not be repeated here.

[0041] Among them, household appliance can be specifically air conditioner or dust collector etc.

[0042] Additional aspects and advantages of the utility model will become apparent from the following description, or can be understood through practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0043] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0044] Figure 1 It is one of partial structure schematic diagram of motor in the embodiments of the utility model;

[0045] Figure 2 It is second partial structure schematic diagram of motor in the embodiments of the utility model;

[0046] Figure 3 It is structure schematic diagram of stator assembly of motor in the embodiments of the utility model;

[0047] Figure 4 It is structure schematic diagram of anticorrosion assembly of motor in the embodiments of the utility model;

[0048] Figure 5 It is structure schematic diagram of rear end cover of motor in the embodiments of the utility model;

[0049] Figure 6 It is structure schematic diagram of rotor assembly of motor in the embodiments of the utility model;

[0050] Figure 7 It is third partial structure schematic diagram of motor in the embodiments of the utility model.

[0051] Among them, Figures 1 to 7 Corresponding relationship between reference signs and component names in the drawings is as follows:

[0052] 1 fixing assembly, 12 housing assembly, 122 front end cover, 124 rear end cover, 1242 mounting hole, 1244 limiting groove, 126 first connecting piece, 14 stator assembly, 142 stator core, 1422 conductive structure, 144 wiring terminal, 146 plastic package, 1462 limiting protrusion, 1464 positioning structure, 1466 positioning groove, 2 rotating assembly, 22 rotor shaft, 24 rotor core, 3 bearing, 32 inner ring, 34 outer ring, 4 anti-electric corrosion assembly, 42 adjusting capacitor, 44 circuit board, 46 second connecting piece, 462 conductive plate. DETAILED DESCRIPTION

[0053] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be described in further detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0054] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced in other ways different from those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0055] The embodiments of the present application will be described below with reference to the drawings. Figures 1 to 7 to describe the motor and household appliance provided by the embodiments of the present application.

[0056] As Figures 1 to 7 shown, the embodiments of the first aspect of the present application provide a motor, which comprises a fixing assembly 1, a rotating assembly 2, a bearing 3 and an anti-electric corrosion assembly 4. The rotating assembly 2 is rotatably installed on the fixing assembly 1 and comprises a rotor shaft 22. The bearing 3 is installed on the fixing assembly 1 and is used to support the rotor shaft 22, the bearing 3 comprises an inner ring 32 and an outer ring 34, the inner ring 32 is sleeved on the rotor shaft 22, and the outer ring 34 is electrically connected with the fixing assembly 1. The anti-electric corrosion assembly 4 is installed on the fixing assembly 1 and comprises an adjusting capacitor 42, the adjusting capacitor 42 is connected with the fixing assembly 1 or the rotating assembly 2 and can adjust the voltage difference between the fixing assembly 1 and the rotating assembly 2.

[0057] The motor provided by the embodiment of the utility model, comprising fixed assembly 1, rotating assembly 2, bearing 3 and anticorrosion assembly 4, wherein, fixed assembly 1 refers to the stator and its related parts (for example, the shell), which is fixedly opposite to the rotating part, rotating assembly 2 is rotatably installed on fixed assembly 1, bearing 3 is installed on fixed assembly 1 and can support the installation of rotor shaft 22, bearing 3 comprises inner ring 32 and outer ring 34, inner ring 32 is sleeved on rotor shaft 22 and rotates together with rotor shaft 22, outer ring 34 is electrically connected with fixed assembly 1, and outer ring 34 is fixed relative to rotor shaft 22 with fixed assembly 1. Wherein, anticorrosion assembly 4 is installed on fixed assembly 1, and the adjusting capacitor 42 in anticorrosion assembly 4 can adjust the voltage (or voltage difference) on fixed assembly 1, so as to adjust the voltage difference between fixed assembly 1 and rotating assembly 2. It can be understood that the potential difference between fixed assembly 1 and rotating assembly 2 is relatively stable due to the design of the motor and the electromagnetic induction relationship, therefore, during the manufacturing process of the motor, an anticorrosion assembly 4 is arranged on fixed assembly 1, and by adjusting the voltage of fixed assembly 1, the potential difference between fixed assembly 1 and rotating assembly 2 can be offset. Wherein, for different characteristics of the motor, different capacity adjusting capacitors 42 can be arranged to compensate the voltage value generated by fixed assembly 1.

[0058] The motor provided by the present application can reduce the voltage difference between rotating assembly 2 and fixed assembly 1 by adjusting the voltage, so as to reduce the voltage difference between inner ring 32 and outer ring 34 of bearing 3, alleviate the electric corrosion of bearing 3, and improve the service life of bearing 3.

[0059] Wherein, fixed assembly 1 is an equipotential body, that is, the potential of each part of fixed assembly 1 is consistent, and there is no potential difference inside.

[0060] In some embodiments, optionally, as shown in Figure 1 and Figure 2 Fixed assembly 1 comprises: front end cover 122 and rear end cover 124; stator assembly 14 is installed between front end cover 122 and rear end cover 124 and comprises stator core 142, stator core 142, front end cover 122 and rear end cover 124 are in equal potential connection; one of stator core 142, front end cover 122 and rear end cover 124 is connected with the first end of adjusting capacitor 42, and the other of stator core 142, front end cover 122 and rear end cover 124 is connected with the second end of adjusting capacitor 42.

[0061] In this embodiment, the fixed assembly 1 comprises a front end cover 122 and a rear end cover 124, and a stator assembly 14 between the front end cover 122 and the rear end cover 124. The stator assembly 14 comprises a stator core 142. The stator core 142, the front end cover 122 and the rear end cover 124 are connected at the same potential, so that the fixed assembly 1 forms an equipotential body, and no potential difference exists between the stator core 142, the front end cover 122 and the rear end cover 124, thereby avoiding current flowing between the stator core 142, the front end cover 122 and the rear end cover 124, and reducing the risk of electro-erosion of the stator assembly 14. Meanwhile, one of the stator core 142, the front end cover 122 and the rear end cover 124 is connected to a first end of the adjusting capacitor 42, and the other of the stator core 142, the front end cover 122 and the rear end cover 124 is connected to a second end of the adjusting capacitor 42, so that the adjusting capacitor 42 is connected to the fixed assembly 1, and the voltage of the fixed assembly 1 can be adjusted, so as to eliminate the pressure difference between the fixed assembly 1 and the rotor assembly as much as possible, and avoid the pressure difference between the inner ring 32 and the outer ring 34 of the bearing 3, thereby preventing the lubricating grease oil film from being broken.

[0062] In this embodiment, the front end cover 122 and the rear end cover 124 are both conductive members, and the stator core 142 is a non-conductive member. Alternatively, the front end cover 122 and the rear end cover 124 are both metal members.

[0063] In some embodiments, the fixed assembly 1 further comprises a first connecting member 126 for connecting the front end cover 122 and the rear end cover 124, and the first end of the adjusting capacitor 42 is connected to the stator core 142, and the second end of the adjusting capacitor 42 is connected to the rear end cover 124. Figure 1 Figure 2 and Figure 3 In some embodiments, the fixed assembly 1 further comprises a first connecting member 126 for connecting the front end cover 122 and the rear end cover 124, and the first end of the adjusting capacitor 42 is connected to the stator core 142, and the second end of the adjusting capacitor 42 is connected to the rear end cover 124.

[0064] In this embodiment, the fixed assembly 1 further comprises a first connecting member 126 for connecting the front end cover 122 and the rear end cover 124, and the two ends of the adjusting capacitor 42 are connected to the stator core 142 and the rear end cover 124, respectively. The first connecting member 126 is a conductive member, and can balance the potential difference between the front end cover 122 and the rear end cover 124, so as to prevent the discharge current of the housing assembly 12 from flowing through the housing assembly 12, and improve the safety of the motor. Meanwhile, the two ends of the adjusting capacitor 42 are connected to the stator core 142 and the rear end cover 124, respectively, and the potential difference between the housing assembly 12 and the stator core 142 tends to be the same through the charge and discharge process of the adjusting capacitor 42. It can be seen that the first connecting member 126 and the adjusting capacitor 42 can prevent the fixed assembly 1 from generating discharge current, prevent the discharge current from damaging the components in the motor, and improve the service life of the motor.

[0065] In this embodiment, the front end cover 122 and the rear end cover 124 are both conductive members, and the stator core 142 is a non-conductive member. Alternatively, the front end cover 122 and the rear end cover 124 are both metal members. Figure 3 In this embodiment, the front end cover 122 and the rear end cover 124 are both conductive members, and the stator core 142 is a non-conductive member. Alternatively, the front end cover 122 and the rear end cover 124 are both metal members.

[0066] ​In some embodiments, optionally, as shown in Figure 1 , Figure 2 and Figure 4 the anti-corrosion assembly 4 comprises a circuit board 44, the adjusting capacitor 42 is mounted on the circuit board 44; a second connecting member 46 is mounted on the circuit board 44 and used to connect the second end of the adjusting capacitor 42 and the rear end cover 124.

[0067] In this embodiment, the anti-corrosion assembly 4 comprises the circuit board 44 and the second connecting member 46, the adjusting capacitor 42 is mounted on the circuit board 44 and constitutes the anti-corrosion assembly 4 together with the second connecting member 46, that is, the circuit board 44 and the second connecting member 46 are integrated on the circuit board 44, which simplifies the assembly mode of the anti-corrosion assembly 4 and also facilitates the inspection and maintenance of the product by maintenance personnel. At the same time, the second end of the adjusting capacitor 42 and the rear end cover 124 are connected through the second connecting member 46, which can improve the stability of the connection. Compared with the direct wire connection mode, the second connecting member 46 can provide more reliable electrical connection.

[0068] In some embodiments, optionally, the second connecting member 46 is a conductive member.

[0069] In some embodiments, optionally, as shown in Figure 1 , Figure 2 and Figure 4 the stator core 142 is provided with a conductive structure 1422, the circuit board 44 is connected with the conductive structure 1422, and the first end of the adjusting capacitor 42 is connected with the circuit board 44 to be connected through the circuit board 44 and the stator core 142.

[0070] In this embodiment, the conductive structure 1422 is provided on the stator core 142, and the circuit board 44 is connected therewith, and the first end of the adjusting capacitor 42 is connected with the circuit board 44, thereby realizing the electrical connection between the adjusting capacitor 42 and the stator core 142, which can control the potential difference between the stator core 142 and the housing assembly 12 by using the adjusting capacitor 42, thereby avoiding the influence of the discharge current generated by the potential difference on the service life of the motor.

[0071] As shown in Figure 3 , a step can be formed at the top of the plastic package 146, and the conductive structure 1422 and the plurality of terminal pins 144 can be arranged at the step.

[0072] Optionally, the first connecting member 126 and / or the second connecting member 46 is a conductive metal member.

[0073] In this embodiment, the first connecting member 126 is a conductive metal member, and the second connecting member 46 is also a conductive metal member. For example, copper or aluminum with low resistivity is used as the material of the conductive metal member, and the conductive metal member can maximize the reduction of voltage difference at the connection site by using its own low-resistance characteristics.

[0074] Of course, the first connecting member 126 and the second connecting member 46 can also be non-metallic conductive members, for example, graphite, carbon nanotubes, graphene, and the like.

[0075] In some embodiments, the first connecting member 126 and / or the second connecting member 46 are metal springs.

[0076] In this embodiment, the first connecting member 126 is a metal spring, and the second connecting member 46 is a metal spring. The metal spring has elasticity and can be tightly attached to the connected component by its elastic deformation during installation, thereby improving the stability of the connection. At the same time, the metal spring can be flexibly designed and deformed according to the spatial layout inside the motor, which not only meets the connection requirements but also facilitates the miniaturization design of the motor.

[0077] In some embodiments, as shown in Figure 1 , Figure 3 and Figure 7 , the anti-electric corrosion assembly 4 is installed on the stator assembly 14, and the stator assembly 14 is provided with a positioning structure 1464 for positioning the second connecting member 46.

[0078] In this embodiment, the anti-electric corrosion assembly 4 is installed on the stator assembly 14, and the positioning structure 1464 on the stator assembly 14 can limit the second connecting member 46. In this way, the installation of the second connecting member 46 can be facilitated, and the accuracy of the installation position of the second connecting member 46 can be improved, thereby facilitating the conductive connection between the anti-electric corrosion assembly 4 and the rear end cover 124.

[0079] In some embodiments, as shown in Figure 3 , the positioning structure 1464 is a positioning groove 1466, and the second connecting member 46 is a conductive plate 462. At least part of the conductive plate 462 is limitedly installed at the positioning groove 1466.

[0080] In this embodiment, at least part of the conductive plate 462 is limitedly installed at the positioning groove 1466, so that the conductive plate 462 can be effectively constrained during the operation of the motor to prevent displacement or shaking. The positioning groove 1466 functions as a limiting structure, and the limiting function of the positioning groove 1466 allows the conductive plate 462 to be firmly maintained at the target position. At the same time, the positioning groove 1466 is provided on the stator core 142, which can reduce the risk of short circuit compared to the positioning protrusion. The positioning groove 1466 does not contact other conductive components, thereby improving the safety of the motor. At the same time, the risk of workers being scratched by the protrusion during assembly of the second connecting member 46 is avoided, thereby improving the assembly safety.

[0081] In some embodiments, as shown in Figure 3 andFigure 7 As shown in the figure, the stator assembly 14 further comprises a plurality of terminal clamps 144; and a stator winding disposed on the stator core 142 and connected with the plurality of terminal clamps 144.

[0082] In this embodiment, the stator assembly 14 further comprises a plurality of terminal clamps 144 and a stator winding disposed on the stator core 142 and connected with the plurality of terminal clamps 144. The stator winding can be powered through the terminal clamps 144.

[0083] In some embodiments, as shown in the figure, Figure 7 As shown in the figure, the plurality of terminal clamps 144 are disposed on the anti-corrosion assembly 4. Specifically, the plurality of terminal clamps 144 can be disposed on the circuit board 44 of the anti-corrosion assembly 4.

[0084] By disposing the terminal clamps 144 on the anti-corrosion assembly 4, the integration between the terminal clamps 144 and the anti-corrosion assembly 4 is achieved, which can reduce the number of components and make the internal structure of the motor simpler.

[0085] In some embodiments, as shown in the figure, Figure 3 As shown in the figure, the plurality of terminal clamps 144 are disposed on the stator core 142.

[0086] In this embodiment, the plurality of terminal clamps 144 can be directly disposed on the stator core 142 or the plastic package 146 of the stator core 142, which facilitates wiring with the stator winding.

[0087] In some embodiments, as shown in the figure, Figure 3 and Figure 7 As shown in the figure, the stator assembly 14 further comprises a plastic package 146, the stator core 142 is disposed in the plastic package 146, the front end cover 122 and the rear end cover 124 are installed on the opposite sides of the plastic package 146; and the anti-corrosion assembly 4 is installed in the space surrounded by the front end cover 122, the rear end cover 124 and the plastic package 146. By installing the anti-corrosion assembly 4 in the cavity space composed of the plastic package 146, the front end cover 122 and the rear end cover 124, the safety is high and the motor assembly and use are not affected.

[0088] Further, a limiting groove 1244 is disposed on the plastic package 146, a limiting protrusion 1462 is disposed on the stator core 142, and the stator core 142 and the rear end cover 124 are positioned and connected through the limiting groove 1244 and the limiting protrusion 1462.

[0089] As shown in the figure, Figure 6 As shown in the figure, the rotating assembly 2 further comprises a rotor core 24, and the rotor shaft 22 is installed on the rotor core 24 and can rotate with the rotor core 24.

[0090] The second aspect of the utility model provides a kind of household appliance, including the motor of any one of the first aspect of embodiment.

[0091] The household appliance provided by the second aspect of the utility model includes the motor of any one of the first aspect of embodiment, so the household appliance has all beneficial effects of the motor of any one of the first aspect of embodiment, which will not be repeated here.

[0092] The household appliance can be specifically an air conditioner or a dust collector.

[0093] The motor in a specific embodiment will be introduced below.

[0094] In the working process of the DC motor using PWM (Pulse Width Modulation) frequency converter, three-phase alternating current is simulated by switching action of electronic components, and common-mode voltage (i.e., the vector sum of the three instantaneous values) is generated due to the total asymmetry of the output three-phase voltage instantaneous value. Due to the difference in electrostatic capacity inside the motor, the common-mode voltage is divided to the inner ring 32 side and the outer ring 34 side of the bearing 3, so that a potential difference called "shaft voltage (or bearing 3 voltage)" is generated between the inner / outer rings 34 of the bearing 3. Since the oil film thickness of the lubricating grease is very thin (only between 0.1 pm and 2 pm) after the bearing 3 is running, when the value of the shaft voltage exceeds the critical breakdown voltage of the lubricating grease oil film of the bearing 3, bearing 3 current (discharge current) will flow, causing damage (electrical erosion) to the metal channel surface of the bearing 3. Bearing 3 erosion has always been a key factor affecting the noise and service life of the motor.

[0095] The main countermeasures to improve the bearing 3 erosion of the DC motor are to connect the front / rear end covers 124 and the stator core 142 with conductive elements to form equipotential, or (and) to use an insulated rotor, so as to balance the capacitance of the inner / outer rings 34 of the bearing 3, thereby reducing the voltage difference between the inner / outer rings 34 of the bearing 3 and alleviating the bearing 3 erosion. However, the above countermeasures have poor adjustment effect, especially for thick oil film bearings 3 (such as SRM

[0096] (Synchronous Reluctance Motor, synchronous reluctance motor) bearing 3, SRH

[0097] (Synchronous Reluctance Hub, synchronous reluctance hub) bearing 3) motor shaft voltage cannot be adjusted to a reasonable range, and: the rotor adopts an insulated structure, which has defects such as complex structure, interference between the magnetic shoe and the shaft, and the plastic insulation layer cannot withstand large torque. The structure of the utility model well solves the above problems.

[0098] The utility model aims at solving the problem of electric corrosion of PWM (pulse width modulation) frequency converter DC motor bearing 3, and provides a structure which can effectively reduce the voltage difference of bearing 3 inner / outer ring 34 and relieve the electric corrosion of bearing 3.

[0099] The anti-electric corrosion assembly 4 is arranged between the front / rear end cover 124 and the stator core 142, and contains the adjusting capacitor 42; by changing the capacitance of the adjusting capacitor 42, the capacitor capacity of the bearing 3 inner / outer ring 34 can be flexibly and effectively balanced, so as to reduce the voltage difference of the bearing 3 inner / outer ring 34 and relieve the electric corrosion problem of the bearing 3.

[0100] The anti-electric corrosion assembly 4 is arranged between the front / rear end cover 124 and the stator core 142, and contains the adjusting capacitor 42; by changing the capacitance of the adjusting capacitor 42, the capacitor capacity of the bearing 3 inner / outer ring 34 can be flexibly and effectively balanced, so as to reduce the voltage difference of the bearing 3 inner / outer ring 34 and relieve the electric corrosion problem of the bearing 3.

[0101] The utility model relates to a kind of motors, comprising: rear end cover 124, fixed assembly 1, anti-electric corrosion assembly 4, rotor assembly and bearing 3. Figure 5 As shown in the figure, the rear end cover 124 is provided with bearing chamber (mounting hole 1242), assembly stop groove (first positioning groove 1466);Fixed assembly 1 is provided with front end cover 122, stator core 142, wiring pin (wiring terminal 144), electric corrosion pin (conductive structure 1422), short conducting plate slot (positioning groove 1466), stator stop (first positioning protrusion), long conducting plate (first connecting piece 126), plastic package body 146 and internal insulation frame, stator winding etc.;Anti-electric corrosion assembly 4 is provided with adjusting capacitor 42, PCB board (circuit board 44), short conducting plate (second connecting piece 46) rotor assembly, is provided with rotor shaft 22, rotor core 24.

[0102] The utility model principle combines Figures 1 to 7 As follows:

[0103] Front end cover 122 and rear end cover 124 are connected by long conducting plate, so that front end cover 122 and rear end cover 124 form equipotential, stator core 142 is connected with anti-electric corrosion assembly 4 at one end by electric corrosion pin, anti-electric corrosion assembly 4 is connected with rear end cover 124 at the other end by short conducting plate, and the capacitor capacity of bearing 3 outer ring 34 can be changed by adjusting capacitor 42 in anti-electric corrosion assembly 4, so that the capacitor capacity of bearing 3 inner / outer ring 34 is balanced, thereby reducing the voltage difference of bearing 3 inner / outer ring 34 and relieving the electric corrosion problem of bearing 3.

[0104] Anti-electric corrosion assembly 4 is fixed by cooperating with electric corrosion pin, short conducting plate slot and limiting column, and is flexible and easy to operate. The adjusting capacitor 42 in anti-electric corrosion assembly 4 can be quantitatively designed / selected according to the specific difference of capacitor capacity of different motor bearing 3 inner / outer ring 34, and has strong adjusting function and wide application range.

[0105] The anticorrosion assembly 4 is installed in the cavity space formed by the plastic package body 146, the front end cover 122 and the rear end cover 124 of the fixing assembly 1, and has high safety and does not affect the assembly and use of the motor.

[0106] The short conducting plate and the long conducting plate are designed in the structure of elastic sheet and are attached to the surface of the stator stopper, and after the assembly stopper groove of the rear end cover 124 is assembled in interference fit with the stator stopper, the rear end cover 124 can be effectively conducted with the short conducting plate and the long conducting plate, and the structure is economical, practical and highly reliable.

[0107] In the description of the present specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, detachable connection or integral connection; can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0108] In the description of the present specification, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0109] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric machine characterized in that, The motor comprises: a fixed assembly; a rotating assembly rotatably mounted on the fixed assembly, comprising a rotor shaft; a bearing mounted on the fixed assembly for supporting the rotor shaft, the bearing comprising an inner ring and an outer ring, the inner ring being sleeved on the rotor shaft, and the outer ring being connected with the fixed assembly; an anti-electric corrosion assembly mounted on the fixed assembly, comprising an adjusting capacitor, the adjusting capacitor being connected with the fixed assembly or the rotating assembly and capable of adjusting a voltage difference between the fixed assembly and the rotating assembly.

2. The electric machine of claim 1, wherein, The fixed assembly comprises: a front end cover and a rear end cover; a stator assembly mounted between the front end cover and the rear end cover, comprising a stator core, the stator core, the front end cover and the rear end cover being in equal potential connection; a first end of the adjusting capacitor being connected with one of the stator core, the front end cover and the rear end cover, and a second end of the adjusting capacitor being connected with another of the stator core, the front end cover and the rear end cover.

3. The electric machine of claim 2, wherein, The fixed assembly further comprises: a first connecting member for connecting the front end cover and the rear end cover; the first end of the adjusting capacitor being connected with the stator core, and the second end of the adjusting capacitor being connected with the rear end cover.

4. The electric machine of claim 3, wherein, The anti-electric corrosion assembly comprises: a circuit board, the adjusting capacitor being mounted on the circuit board; a second connecting member mounted on the circuit board for connecting the second end of the adjusting capacitor and the rear end cover.

5. The electric machine of claim 4, wherein, The stator core is provided with a conductive structure, the circuit board is connected with the conductive structure, and the first end of the adjusting capacitor is connected with the circuit board to be connected through the circuit board and the stator core.

6. The electric machine of claim 4, wherein, The first connecting member and / or the second connecting member is / are a conductive metal member.

7. The electric machine of claim 4, wherein, The first connecting member and / or the second connecting member is / are a metal spring.

8. The motor of claim 5, wherein: the anti-electric corrosion assembly is mounted on the stator core, and the stator assembly is provided with a positioning structure for positioning the second connecting member.

9. The motor of claim 8, wherein: the positioning structure is a positioning groove, and the second connecting member is a conductive plate, at least a part of the conductive plate being limitingly mounted at the positioning groove.

10. The electric machine of any one of claims 2 to 9, characterized by, The stator assembly further comprises: a plurality of terminal connectors; a stator winding provided on the stator core and connected with the plurality of terminal connectors; wherein the plurality of terminal connectors are provided on the anti-electric corrosion assembly.

11. The electric machine of any one of claims 2 to 9, characterized by The stator assembly further comprises: a plastic package body, the stator core being provided in the plastic package body, and the front end cover and the rear end cover being mounted on two opposite sides of the plastic package body; the anti-electric corrosion assembly being mounted in a space surrounded by the front end cover, the rear end cover and the plastic package body.

12. A domestic appliance characterized in that, The motor comprises the motor according to any one of claims 1 to 11.

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