CN217282511U - Shaft voltage suppression assembly and driving motor - Google Patents

Abstract

The utility model discloses a shaft voltage suppression subassembly and driving motor belongs to driving motor and electric drive system technical field, and the shaft voltage suppression subassembly is used for driving motor, and driving motor includes motor housing and pivot, and the motor housing is worn out to the one end of pivot, and the pivot is worn out motor housing department cover and is equipped with the bearing; the shaft voltage suppression assembly is installed in the cavity and comprises a capacitor device connected with the motor shell and a conductive part respectively connected with the capacitor device and the rotating shaft. The utility model provides an among the prior art driving motor's axle voltage suppression effect relatively poor, lead to the bearing the problem that the electro-corrosion phenomenon appears, carry out the partial pressure to bearing voltage through the capacitance device, carry out the drainage through conductive part to bearing inner race axle current, realized effectively suppressing the effect of axle voltage.

Description

Shaft voltage suppression assembly and driving motor

Technical Field

The utility model relates to a driving motor and electric drive system technical field, in particular to axle voltage restraines subassembly and driving motor.

Background

The driving motor is a power source of the electric vehicle, and in the operation process of converting electric energy into mechanical energy, shaft voltage can be generated at two ends of a bearing of the driving motor or between a rotating shaft and the bearing. The shaft voltage easily causes the bearing to have an electric corrosion phenomenon.

A traditional driving motor is provided with conducting parts such as a conducting ring or a conducting carbon brush, a conducting bypass is formed through the conducting parts, and shaft current of the driving motor is guided, so that shaft voltage of an inner ring and an outer ring of a bearing is reduced, and electric corrosion of the bearing is avoided. But when setting up electrically conductive part and reduce the axle voltage of bearing inner and outer lane through setting up electrically conductive part drainage among the prior art, have the relatively poor problem of effect of restraining axle voltage.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at: the utility model provides an axle voltage restraines subassembly and driving motor, aims at solving among the prior art driving motor's axle voltage suppression effect relatively poor, leads to the technical problem that the bearing appears the galvanic corrosion phenomenon.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the utility model provides an axle voltage restraines subassembly for driving motor, driving motor includes:

the motor comprises a motor shell and a rotating shaft, wherein one end part of the rotating shaft penetrates out of the motor shell;

wherein the shaft voltage suppression assembly is mounted at the end portion;

the shaft voltage suppression assembly includes:

a capacitive device connected with the motor housing; and

a conductive member connected to the capacitor device and the rotation shaft, respectively.

Optionally, in the above shaft voltage suppressing assembly, the capacitor device includes:

a housing;

a capacitor disposed within the housing;

the first conductive elastic sheet comprises a first contact end and a first leading-out end, the first contact end is arranged between the capacitor and one inner wall of the shell, and the first leading-out end extends out of the shell and is connected with the motor shell; and

the second conductive elastic sheet comprises a second contact end and a second leading-out end, the second contact end is arranged between the capacitor and the other inner wall of the shell, and the second leading-out end extends out of the shell and is connected with the conductive component.

Optionally, in the above shaft voltage suppressing assembly, a part of the side wall of the housing protrudes to form at least one positioning arm; the shaft voltage suppression assembly further includes:

at least one first fastener passing through the positioning arm to connect with the motor housing to lock the housing to the motor housing.

Optionally, in the shaft voltage suppressing component, the shaft voltage suppressing component further includes:

and the second conductive elastic sheet is connected with the conductive part through the fastening component.

Optionally, in the above shaft voltage suppressing assembly, the fastening assembly includes:

the limiting part is arranged on the side wall of one side of the shell, a conducting part limiting space is formed between the limiting part and the shell, and the conducting part is arranged in the conducting part limiting space; and

and the second fastening piece is connected with the shell so as to lock the limiting piece on the shell.

Optionally, in the above shaft voltage suppressing assembly, the housing is an injection molded part.

Optionally, in the above shaft voltage suppressing assembly, the capacitor is encapsulated in the housing by a potting adhesive.

Optionally, in the above shaft voltage suppressing component, the capacitor is any one of a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, a multilayer ceramic capacitor, a polypropylene capacitor, a high-frequency ceramic capacitor, or a glass glaze capacitor.

Optionally, in the shaft voltage suppressing assembly, the conductive component is any one of a conductive carbon brush, a conductive ring or a conductive elastic sheet.

In a second aspect, the present invention further provides a driving motor, the driving motor includes:

a motor housing;

the rear end cover is arranged on the motor shell, wherein the rear end cover and the motor shell form a cavity;

one end of the rotating shaft penetrates out of the motor shell, the end is located in the cavity, and a bearing is sleeved at the end; and

the shaft voltage suppression assembly as described above, the shaft voltage suppression assembly being mounted within the cavity.

The utility model provides an above-mentioned one or more technical scheme can have following advantage or has realized following technological effect at least:

the utility model provides an axle voltage suppression subassembly and driving motor, axle voltage suppression subassembly install in the tip that motor housing was worn out in driving motor's pivot, through adopting the capacitor device who is connected with driving motor's motor housing, this capacitor device is located driving motor inside, and parallelly connected with driving motor's bearing electric capacity, can increase the equivalent electric capacity of the interior outer lane of bearing, divide voltage to driving motor's bearing voltage, make the axle voltage between the interior outer lane of bearing reduce, avoid the axle voltage to cause the galvanic corrosion to driving motor's pivot; the current of the inner ring and the outer ring of the bearing is conducted through the conductive parts respectively connected with the capacitor device and the rotating shaft of the driving motor, namely the current passing through the rotating shaft can be shunted from the branch of the conductive parts, so that the shaft current passing through the bearing is reduced, and the occurrence of the bearing electric corrosion phenomenon is further effectively prevented; the utility model discloses an effectively restrain the technological effect of axle voltage.

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 a driving motor according to an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural diagram of an axial voltage suppressing assembly according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view of FIG. 3 cut along line B;

FIG. 5 is a schematic view of an installation layout of the shaft voltage suppressing member according to the embodiment of the present application;

FIG. 6 is an equivalent circuit diagram of a shaft voltage suppressing component according to an embodiment of the present application;

fig. 7 is a graph showing the shaft voltage suppressing effect of the shaft voltage suppressing member in the embodiment of the present application.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name(s)
				100	Shaft voltage suppression assembly	200	Driving motor
110	Capacitor device	210	Rear end cap
				120	Conductive member	220	Motor casing
111	Shell body	230	Rotating shaft
				112	Capacitor with improved capacitance	240	Cavity body
113	First conductive spring	250	Bearing assembly
				114	Second conductive elastic sheet	130	First fastener
115	Pouring sealant	140	Fastening assembly
				116	Positioning arm	141	Position limiting piece
117	Positioning column	142	Second fastener

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

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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 of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that, in the embodiment of the present invention, all the directional indicators (such as upper, lower, left, right, front, and rear … …) are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a device or system that comprises the element. In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "connected" may be a fixed connection or a removable connection, or may be integral therewith; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internally or in interactive relation.

In the present application, if there is a description relating to "first", "second", etc., 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, in the present invention, suffixes such as "module", "part", or "unit" used to represent elements are used only for facilitating the description of the present invention, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In addition, the technical solutions of 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 be considered to be absent, and is not within the protection scope of the present invention.

The prior art is analyzed and found that the driving motor is a power source of the electric vehicle, and in the running process of converting electric energy into mechanical energy, shaft voltage can be generated at two ends of a bearing or between a rotating shaft and the bearing of the driving motor. The oil film insulation of the bearing grease damages the shaft voltage, generally five to ten volts, but when the shaft voltage exceeds the oil film breakdown voltage, the oil film is easy to generate EDM (Electrical Discharge Machining) Discharge, so that the inner ring and the outer ring of the bearing and the surface of the ball are ablated to generate spots; the EDM discharge frequently occurs for a long time, and obvious washboard grains appear on the surfaces of the inner ring, the outer ring and the ball of the bearing, so that the bearing is damaged by electric corrosion. Therefore, the shaft voltage easily causes the bearing to have an electric corrosion phenomenon.

To the galvanic corrosion phenomenon of bearing, traditional drive motor can set up electrically conductive parts such as conducting ring or electrically conductive carbon brush, forms electrically conductive bypass through electrically conductive parts, and drive motor's axle current can carry out the drainage through electrically conductive parts this moment, and then reduces the axle voltage of bearing inner and outer lane to avoid the risk that the bearing takes place galvanic corrosion.

However, the conductivity of the conductive ring or the conductive carbon brush may change in the oil product, which leads to unstable conductivity; meanwhile, after the motor rotor runs at a high speed for a long time, the conductive part is abraded, contact resistance is increased after abrasion, and the conductive effect is easily influenced; furthermore, particles generated by the abrasion of the conductive carbon brush also affect the cleanliness and the conductivity of the oil product. Therefore, when the shaft voltage of the inner ring and the outer ring of the bearing is reduced by arranging the conductive part to conduct current to the driving motor in the prior art, the problem of poor suppression effect exists.

In view of the technical problem that the shaft voltage suppression effect of the driving motor in the prior art is poor, which causes the electric corrosion phenomenon of the bearing, the application provides a shaft voltage suppression assembly and a driving motor, and the embodiment and the implementation mode are as follows:

example one

Referring to fig. 1 to 6, the present embodiment provides an axle voltage suppressing assembly. Fig. 1 is a schematic structural diagram of a driving motor provided in the present application, and fig. 2 is a partial enlarged view of a point a in fig. 1, where a shaft voltage suppression assembly 100 is used for a driving motor 200, and the driving motor 200 includes:

a motor housing 220;

a rear end cap 210 disposed on the motor housing 220, wherein the rear end cap 210 and the motor housing 220 form a cavity 240; and

one end of the rotating shaft 230 penetrates through the motor housing 220, the end is located in the cavity 240, and a bearing 250 is sleeved at the end;

wherein the shaft voltage suppression assembly 100 is mounted at the end.

Fig. 3 is a schematic structural diagram of a shaft voltage suppressing assembly provided in the present application, and fig. 4 is a schematic cross-sectional diagram of fig. 3 cut along line B, where the shaft voltage suppressing assembly 100 includes:

a capacitor device 110, the capacitor device 110 being connected to the motor housing 220; and

the conductive member 120, the conductive member 120 is connected to the capacitor device 110 and the rotation shaft 230, respectively.

Specifically, as shown in fig. 1 and 2, the rear end cap 210 of the driving motor 200 and the motor housing 220 form a cavity 240, and the shaft voltage suppressing assembly 100 is installed in the cavity 240. The motor housing 220 of the driving motor 200 protects the driving motor body, and one end of the rotating shaft 230 extends out of the motor housing 220, wherein the rotating shaft 230 may be a rotor shaft of a non-driving end, and the rotating shaft 230 is connected with a rotor of the motor body. As shown in fig. 2 and 3, the shaft voltage suppressing assembly 100 includes two parts, i.e., a capacitor device 110 and a conductive member 120, the conductive member 120 is positioned on top of the capacitor device 110 and connected to each other, the conductive member 120 is in direct contact with the rotation shaft 230, and the capacitor device 110 is fixed to the motor housing 220 and connected to the motor housing 220.

Alternatively, the capacitor device 110 may be a solid capacitor packaged in a plastic-coated manner, and the solid capacitor is any one of a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, a multilayer ceramic capacitor, a polypropylene capacitor, a high-frequency ceramic capacitor, or a glass-glaze capacitor. The conductive member 120 is any one of a conductive carbon brush, a conductive ring, or a conductive elastic sheet. In this embodiment, the solid capacitor is a ceramic capacitor, and the conductive component 120 is a conductive carbon brush.

Fig. 5 is a schematic view of an installation layout of a shaft voltage suppressing assembly according to an embodiment of the present application, in which a conductive member 120 and a capacitive device 110 are disposed between a rotating shaft 230 of a driving motor 200 and a motor housing 220, the conductive member 120 is connected to the rotating shaft 230 and the capacitive device 110, and the capacitive device 110 is further connected to the motor housing 220.

Fig. 6 is an equivalent circuit diagram of the shaft voltage suppressing assembly of the present invention, in which R represents the conductive member 120, C represents the capacitive device 110, and in fig. 6, the entire circuit represents the equivalent circuit diagram of the electric drive system in which the driving motor 200 is located, one end of the common mode voltage Vcom is grounded, the other end is connected to one end of the stator equivalent inductive reactance Ls through the power supply circuit equivalent impedance Zc and the stator equivalent impedance Rs in sequence, the other end of the stator equivalent inductive reactance Ls is connected to one end of the stator winding and stator coupling capacitor Cwf and one end of the stator winding and rotor coupling capacitor Cwr, the other end of the stator coupling capacitor Cwf is grounded, the other end of the stator winding and rotor coupling capacitor Cwr is connected to one end of the stator core and rotor coupling capacitor Csr, one end of the bearing capacitor Cb, and one end of the conductive member R, the other end of the conductive member R is connected to one end of the capacitive device C, the other end of the stator core and the rotor coupling capacitor Csr, the other end of the bearing capacitor Cb and the other end of the capacitor C are all grounded. It can be seen that the shaft voltage suppression assembly 100 of the series connection of the conductive member R and the capacitive device C is in parallel relationship with the bearing capacitance Cb. Here, the bearing capacitance Cb is equivalent to the capacitance on the rotation shaft 230, the connection of the conductive member R to the bearing capacitance Cb is equivalent to the connection of the conductive member 120 to the rotation shaft 230, the connection of the other end of the conductive member R to one end of the capacitor device C is equivalent to the connection of the conductive member 120 to the capacitor device 110, and the connection of the other end of the capacitor device C to ground is equivalent to the connection of the capacitor device 110 to the motor casing 220. Therefore, the shaft current of the inner ring and the outer ring of the bearing can be drained through the conductive device R, and meanwhile, through the capacitor device C connected in parallel, the equivalent capacitance of the inner ring and the outer ring of the bearing is increased, and the voltage of the bearing is divided, so that the shaft voltage suppression assembly 100 can effectively suppress the shaft voltage, and the shaft voltage is prevented from causing electric corrosion to the bearing of the rotor of the driving motor 200, namely the rotating shaft 230.

Fig. 7 is a diagram illustrating the shaft voltage suppressing effect of the shaft voltage suppressing member according to the present invention. To further illustrate the effect of the shaft voltage suppression module 100 provided in this embodiment of the present application on suppressing the shaft voltage, shaft voltage detection is performed on the driving motor without the shaft voltage suppression module and the driving motor with the shaft voltage suppression module, respectively, so as to obtain a shaft voltage change curve as shown in fig. 7, in the graph, the shaft voltage corresponding to the curve 3 is the shaft voltage of the driving motor with the shaft voltage suppression module provided in this embodiment, and is 5V, the shaft voltage corresponding to the curve 2 is the shaft voltage of the driving motor without the shaft voltage suppression module, and is 250V, and the scale 4 indicates the maximum shaft voltage of the driving motor itself, and is 250V; as can be seen from the figure, the shaft voltage of the driving motor provided with the shaft voltage suppression component is obviously lower than the shaft voltage of the driving motor not provided with the shaft voltage suppression component, and the shaft voltage of the driving motor not provided with the shaft voltage suppression component already approaches to the maximum shaft voltage of the driving motor, so that the driving motor is easily damaged if the shaft voltage is not suppressed.

The shaft voltage suppression assembly provided by the embodiment of the application is arranged in a cavity formed by a rear end cover of the driving motor and a motor shell, and a capacitor connected with the motor shell of the driving motor is adopted and is positioned in the driving motor and connected with a bearing capacitor of the driving motor in parallel, so that the equivalent capacitance of an inner ring and an outer ring of a bearing can be increased, the bearing voltage of the driving motor is divided, the shaft voltage between the inner ring and the outer ring of the bearing is reduced, and the rotating shaft of the driving motor is prevented from being electrically corroded by the shaft voltage; the current of the inner ring and the outer ring of the bearing is conducted through the conductive parts respectively connected with the capacitor device and the rotating shaft of the driving motor, namely the current passing through the rotating shaft can be shunted from a branch of the conductive parts, so that the shaft current passing through the bearing is reduced, the bearing is further effectively prevented from being subjected to electric corrosion, and the technical effect of effectively inhibiting shaft voltage is realized.

Example two

Referring to fig. 3 and 4, on the basis of the first embodiment, the present embodiment provides a shaft voltage suppressing assembly.

Further, as shown in fig. 3 and 4, the capacitor device 110 includes:

a housing 111;

a capacitor 112, the capacitor 112 being disposed within the housing 111;

the first conductive spring 113, the first conductive spring 113 includes a first contact end and a first leading-out end, the first contact end is disposed between the capacitor 112 and an inner wall of the housing 111, and the first leading-out end extends to the outside of the housing 111 and is connected with the motor housing 220; and

and the second conductive elastic sheet 114, the second conductive elastic sheet 114 includes a second contact end and a second leading-out end, the second contact end is disposed between the capacitor 112 and the other inner wall of the housing 111, and the second leading-out end extends to the outside of the housing 111 and is connected with the conductive component 120.

Specifically, the housing 111 is an injection molded part, and the capacitor 112 is encapsulated in the housing 111 through the potting adhesive 115; the capacitor 112 is any one of a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, a multilayer ceramic capacitor, a polypropylene capacitor, a high frequency ceramic dielectric capacitor, or a glass glaze capacitor.

In this embodiment, as shown in fig. 3, the housing 111 may be a plastic housing formed by injection molding, specifically, a rectangular parallelepiped with an open top and a movable bottom plate, and is convenient for placing the capacitor 112, the open top is convenient for installing the second conductive elastic piece 114, and the movable bottom plate is convenient for installing the first conductive elastic piece 113. As shown in fig. 4, the capacitor 112 is placed in the case 111, the top of the capacitor is filled with a potting adhesive 115, and the potting adhesive 115 is a top plate of a rectangular parallelepiped with an open top, and the capacitor 112 is filled in the case 111. The selection of the capacitor 112, the specific capacitance value, the withstand voltage, and other parameters may be selected according to actual requirements, for example, adjusted according to the requirement of suppressing the peak value of the shaft voltage. The case 111 protects the capacitor 112 and is easily mounted on the motor housing 220, thereby preventing leakage current. The capacitor 112 is embedded in the shell 111 by the potting adhesive 115, and the capacitor 112 encapsulated in a plastic-coated manner is used as an entity capacitor and is arranged in the driving motor 200, and the voltage peak value of the inner ring and the outer ring of the bearing 250 of the driving motor can be effectively reduced by matching with the conductive component 120 contacted with the rotating shaft 230.

As shown in fig. 4, two conductive elastic pieces, namely a first conductive elastic piece 113 and a second conductive elastic piece 114, are led out from the capacitor device 110, the number of the first conductive elastic pieces 113 is two, and the number of the second conductive elastic pieces 114 is also two.

The two first conductive elastic pieces 113 are both arranged between the capacitor 112 and the inner wall of the shell 111, specifically, the first contact ends of the first conductive elastic pieces 113 are arranged between the capacitor 112 and the inner wall of the bottom plate of the shell 111, so that the first conductive elastic pieces 113 are ensured to be fixed, and the first contact ends are ensured to be in contact with the bottom of the capacitor 112; the first conductive elastic sheet 113 may be bent, specifically, may be bent in three sections, the first section is located between the capacitor 112 and the housing 111, the second section is used as a first bent portion, passes through a gap between a bottom plate of the housing 111 and a bottom edge of a left sidewall of the housing 111, and is directly led out of the housing 111, so that the third section, i.e., the first lead-out end, extends out of the housing 111 and is flush with a plane where the bottom edge of the housing 111 is located, and a length of the first bent portion is consistent with a thickness of the bottom plate of the housing 111; the first leading-out ends of the two first conductive elastic sheets 113 are respectively led out from the bottom of the shell 111, are respectively located at the left side and the right side of the shell 111, extend out of the shell 111, and are symmetrical along the left side and the right side of the center line of the shell 111, and the two first leading-out ends are respectively connected with the motor shell 220. The bottom plate of the casing 111 may be movable, for example, an independent cover plate, and correspondingly, the casing 111 is a through structure, the top is encapsulated by the potting compound 115, the bottom is encapsulated by the cover plate, the capacitor 112 is disposed in the casing 111, as shown in fig. 4, the capacitor 112 and the cover plate press the first contact end of the first conductive elastic sheet 113, the first bending portion of the first conductive elastic sheet 113 is led out (not shown in the drawing) from the edge of the bottom of the left sidewall of the cover plate and the casing 111, so that the first lead-out end of the first conductive elastic sheet 113 shown in fig. 3 extends out of the casing 111, and the first lead-out end is located at the bottom of the casing 111 and is connected to the motor housing 220.

The two second conductive elastic pieces 114 are both arranged between the capacitor 112 and the other inner wall of the shell 111, specifically, the second contact ends of the second conductive elastic pieces 114 are arranged between the capacitor 112 and the potting adhesive 115 serving as the top of the shell 111, so that the second conductive elastic pieces 114 are ensured to be fixed, and the second contact ends are ensured to be in contact with the top of the capacitor 112; the second conductive elastic sheet 114 may be bent, and specifically may be bent in three sections, the first section, that is, the second contact end is located between the capacitor 112 and the potting adhesive 115, the second section is used as a second bent portion and fixed by the potting adhesive 115, passes through the potting adhesive 115, and is directly led out of the housing 111, so that the third section, that is, the second lead-out end is completely exposed out of the housing 111 and is flush with the plane where the top edge of the housing 111 is located, and the length of the second bent portion is consistent with the thickness of the potting adhesive 115; the second leading-out ends of the two second conductive elastic sheets 114 are respectively led out from the top of the shell 111, are respectively positioned at two sides of the conductive part 120 arranged at the top of the shell 111, are symmetrical along the left side and the right side of the center line of the shell 111, and are respectively connected with the conductive part 120.

It should be noted that the specific connection manner of the first conductive elastic sheet 113 connected to the motor housing 220 and the second conductive elastic sheet 114 connected to the conductive member 120 may be screw fixing, welding, crimping, and the like, and may be set according to actual conditions.

Further, a part of the side wall of the housing 111 is protruded to form at least one positioning arm 116;

the shaft voltage suppression assembly further includes:

and at least one first fastener 130, wherein the first fastener 130 passes through the positioning arm 116 to be connected with the motor housing 220 so as to lock the shell 111 on the motor housing 220.

Specifically, as shown in fig. 2, the first conductive elastic piece 113 is connected to the motor housing 220 through a first fastening member 130. As shown in fig. 3, at least one positioning arm 116 is formed by protruding a part of the side wall of the housing 111, and at least one first fastening member 130 is correspondingly configured, the positioning arm 116 and the first leading end of the first conductive elastic piece 113 are fixed on the motor housing 220 through the first fastening member 130, so as to lock the housing 111 on the motor housing 220, thereby locking the capacitor device 110 on the motor housing 220.

In this embodiment, as shown in fig. 2 and fig. 3, two positioning arms 116 are provided, the positioning arms 116 may be injection molded together with the housing 111, one end of each positioning arm is integrally connected to an outer wall of the housing 111, the other end of each positioning arm is suspended and is correspondingly provided with a hole for installing the first fastener 130, the bottom of each positioning arm 116 is flush with the bottom edge of the housing 111 and is in contact with the first leading-out end of the first conductive elastic piece 113, the contact manner is crimping, and the first leading-out end of the first conductive elastic piece 113 is located between the positioning arm 116 and the motor housing 220. The first fastening member 130 may be a screw, and the other end of the positioning arm 116 is correspondingly provided with a screw hole for mounting the screw. The number of first fasteners 130 may correspond to the number of positioning arms 116, and two first fasteners 130 are included in this embodiment. In the manner shown in fig. 2, the two first fasteners 130 disposed on the left and right sides of the capacitor device 110 integrally fix the shaft voltage suppression assembly 100 in the cavity 240 of the driving motor 200, specifically, on the surface of the motor housing 220, so as to prevent the assembly from falling off due to the vibration generated during the operation of the driving motor.

Still further, the shaft voltage suppression assembly further comprises:

the fastening assembly 140 and the second conductive elastic sheet 114 are connected with the conductive part 120 through the fastening assembly 140.

Specifically, the fastening assembly 140 includes:

a limiting member 141, the limiting member 141 being disposed on a side wall of the housing 111, and a conductive member limiting space being formed between the limiting member 141 and the housing 111, the conductive member 120 being disposed in the conductive member limiting space; and

and at least one second fastening member 142, wherein the second fastening member 142 is connected with the housing 111 to lock the retaining member 141 to the housing 111.

Specifically, the second conductive dome 114 is connected to the conductive member 120 through the fastening assembly 140. Specifically, the conductive component 120 is any one of a conductive carbon brush, a conductive ring, or a conductive elastic sheet.

In this embodiment, the conductive member 120 is a conductive carbon brush, and as shown in fig. 2 and fig. 3, the conductive carbon brush is in a bar shape, fixed on the top of the capacitor 110 through a fastening assembly 140, and perpendicular to the rectangular parallelepiped capacitor 110, and located on the central axis of the capacitor 110.

The limiting part 141 is arranged on a side wall of the shell 111, specifically, on the top edge and clings to the top edge, a conductive part limiting space is formed between the limiting part 141 and the shell 111, and the conductive part 120 is arranged in the conductive part limiting space; as shown in fig. 2, the limiting member 141 wraps the conductive carbon brush, and both sides of the conductive carbon brush extend to form side wings, which are parallel to the capacitor device 110 and contact with the second terminal of the second conductive elastic piece 114.

At least one positioning column 117 is formed by protruding part of the side wall of the housing 111, the positioning column 117 is perpendicular to the direction of the conductive carbon brush, and the number of the positioning columns 117 is the same as that of the second fastening pieces 142; in this embodiment, part of the side wall of the casing 111 protrudes to form two positioning pillars 117, and the two positioning pillars 117 are both disposed on the outer wall of the motor housing 220, and specifically disposed on the outer wall, i.e. the front outer wall, in the direction in which the second conductive elastic piece 114 is led out of the casing 111, the positioning pillars 117 may be injection molded together with the casing 111, the top of the positioning pillars 117 is tightly attached to the second leading-out end of the second conductive elastic piece 114 and the side wing of the limiting piece 141, the side wing and the second leading-out end are both provided with holes, so that the second fastening piece 142 penetrates through the two holes to be screwed into the positioning pillars 117, the second fastening piece 142 may adopt a self-tapping screw, and the self-tapping screw sequentially penetrates through the side wing of the limiting piece 141 and the second leading-out end of the second conductive elastic piece 114 to be screwed into the positioning pillars 117.

In the manner shown in fig. 2, in this embodiment, the two second fastening members 142 and the limiting members 141 disposed at two sides of the conductive carbon brush are mutually matched to stably sleeve the conductive carbon brush above the capacitor device 110, so as to ensure the stability of the whole voltage suppressing assembly 100, and simultaneously, prevent the brush head of the conductive carbon brush from stably contacting the rotating shaft 230 of the driving motor 200 during the operation of the driving motor and from being loosened due to the vibration of the driving motor. Moreover, the conductive carbon brush arranged in this way does not directly contact the motor housing 220 of the driving motor 200, and even if the conductive carbon brush is worn during long-term operation and the worn particles are attached to the motor housing 220 of the driving motor 200, the conductive member 120 is not affected, so that the shaft voltage suppression effect is not affected, and the suppression effect is not deteriorated.

According to the above arrangement, in this embodiment, through the cooperation between the rotating shaft 230 of the driving motor 200, the conductive carbon brush, the physical capacitor and the motor housing 220 of the driving motor 200, the phenomenon that the shaft voltage cannot be effectively suppressed due to the fact that the conductive carbon brush affects the conductive effect due to the impedance increase after being worn after the driving motor operates for a long time can be avoided, and the bearing electrical corrosion phenomenon caused by the voltage suppression effect deterioration after the driving motor operates for a long time can be avoided.

The shaft voltage suppression assembly of the embodiment has the advantages of low cost, simple structure, small design change and no need of adding redundant assembly procedures on the basis of effectively preventing the bearing from generating the electric corrosion phenomenon, and meanwhile, the driving motor provided with the shaft voltage suppression assembly of the embodiment does not need to consider the problem of oil compatibility and has high practicability; the anti-vibration effect is good, the durable risk is low, and the reliability is high.

EXAMPLE III

Referring to fig. 1 and 2, the present embodiment proposes a driving motor 200, and the driving motor 200 may include:

a motor housing 220;

a rear end cap 210 disposed on the motor housing 220, wherein the rear end cap 210 and the motor housing 220 form a cavity 240;

one end of the rotating shaft 230 penetrates through the motor housing 220, the end is located in the cavity 240, and a bearing 250 is sleeved at the end; and

the shaft voltage suppressing assembly 100, the shaft voltage suppressing assembly 100 is installed in the cavity 240, particularly, at an end of the rotation shaft 230.

The specific structure of the shaft voltage suppressing assembly 100 refers to the above embodiments, and since the present embodiment adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein.

It should be noted that the numbers of the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments. The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all the concepts of the present invention utilize the equivalent structure transformation of the content of the specification and the attached drawings, or directly or indirectly applied to other related technical fields, all included in the patent protection scope of the present invention.

Claims (10)

1. A shaft voltage dampening assembly for a drive motor, the drive motor comprising:

the motor comprises a motor shell and a rotating shaft, wherein one end part of the rotating shaft penetrates out of the motor shell;

wherein the shaft voltage suppression assembly is mounted at the end portion;

the shaft voltage suppression assembly includes:

a capacitor device connected with the motor housing; and

a conductive member connected to the capacitor device and the rotation shaft, respectively.

2. The shaft voltage suppression assembly of claim 1, wherein the capacitive device comprises:

a housing;

a capacitor disposed within the housing;

the first conductive elastic sheet comprises a first contact end and a first leading-out end, the first contact end is arranged between the capacitor and one inner wall of the shell, and the first leading-out end extends out of the shell and is connected with the motor shell; and

the second conductive elastic sheet comprises a second contact end and a second leading-out end, the second contact end is arranged between the capacitor and the other inner wall of the shell, and the second leading-out end extends out of the shell and is connected with the conductive component.

3. The shaft voltage suppression assembly of claim 2, wherein a portion of the sidewall of said housing projects to form at least one detent arm; the shaft voltage suppression assembly further includes:

at least one first fastener passing through the positioning arm to connect with the motor housing to lock the housing to the motor housing.

4. The shaft voltage suppression assembly of claim 2, further comprising:

and the second conductive elastic sheet is connected with the conductive part through the fastening component.

5. The shaft voltage suppression assembly of claim 4, wherein said fastening assembly comprises:

the limiting part is arranged on the side wall of one side of the shell, a conducting part limiting space is formed between the limiting part and the shell, and the conducting part is arranged in the conducting part limiting space; and

at least one second fastener, the second fastener is connected with the casing to lock the locating part on the casing.

6. The shaft voltage suppression assembly of claim 2, wherein said housing is an injection molded part.

7. The shaft voltage suppression assembly of claim 2, wherein said capacitor is potted within said housing by a potting compound.

8. The shaft voltage suppression assembly according to claim 2, wherein the capacitor is any one of a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, a multilayer ceramic capacitor, a polypropylene capacitor, a high frequency ceramic dielectric capacitor, or a glass-glaze capacitor.

9. The shaft voltage suppression assembly of claim 1, wherein the conductive member is any one of a conductive carbon brush, a conductive ring, or a conductive spring.

10. A drive motor, characterized by comprising:

a motor housing;

the rear end cover is arranged on the motor shell, wherein the rear end cover and the motor shell form a cavity;

one end of the rotating shaft penetrates out of the motor shell, the end is located in the cavity, and a bearing is sleeved at the end; and

the shaft voltage suppression assembly according to any one of claims 1 to 9, mounted within the cavity.

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