Motor and electric pump using motor

Abstract

The present invention relates to a motor and an electric pump using the motor. The motor comprises a stator and a rotor. The stator comprises a housing and a stator magnetic core mounted to the inner wall of the housing. The rotor comprises a rotating shaft and a rotor core fixed to the rotating shaft; and the rotor core is surrounded by the stator magnetic core. The housing is an insulating member. The motor comprises a first conductive member; the first conductive member is conductively connected to the stator magnetic core; and the first conductive member has a first grounding portion extending beyond the housing and configured to be conductively connected to the outside. The motor further comprises a second conductive member and a circuit board mounted at one end of the motor; the second conductive member is conductively connected to a grounding position of the circuit board; and a part of the second conductive member is inserted into the stator and is conductively connected to the first conductive member. By implementing the present invention, even if the motor housing is an insulator, the stator magnetic core and the circuit board can be grounded by means of the first conductive member and the second conductive member, thereby improving the electromagnetic compatibility of the motor.

Description

Motor and electric pump using the same TECHNICAL FIELD

[0001] The present application relates to a motor and an electric pump using the same. BACKGROUND

[0002] Generally, a control circuit board is installed at one end of the motor, which is used to detect and control the operation of the motor. Generally, the ground position of the circuit board is connected to the motor shell through a conducting member, and the ground is realized through the motor shell to protect the components of the circuit board and reduce electromagnetic interference (EMI) to the outside. This kind of solution requires the motor shell to be made of conductive metal, which is relatively high in cost. Therefore, an improved solution is needed. TECHNICAL PROBLEM

[0003] One object of the present application is to reduce the cost of the motor and improve the electromagnetic interference of the motor. TECHNICAL SOLUTION

[0004] To this end, the first aspect of the present application provides a motor, comprising a stator and a rotor; the stator comprises a shell and a stator core installed to the inner wall of the shell; the rotor comprises a rotating shaft and a rotor core fixed to the rotating shaft, the rotor core being surrounded by the stator core; wherein: the shell is an insulating member; the motor comprises a first conducting member, the first conducting member being in conductive connection with the stator core, the first conducting member having a first grounding portion extending out of the shell for conductive connection with the outside; the motor further comprises a second conducting member and a circuit board installed to one end of the motor, the second conducting member being in conductive connection with the ground position of the circuit board, a part of the second conducting member being inserted into the stator and in conductive connection with the first conducting member.

[0005] In one embodiment of the present application, the first grounding portion is a free end and has elasticity to enhance the conductive connection with the outside.

[0006] In one embodiment of the present application, the first conducting member is located between the inner wall of the shell and the outer surface of the stator core.

[0007] In one embodiment of the present application, the outer surface of the stator core is provided with a groove, the groove extending along the axial direction of the motor; the first conducting member is installed to the groove and in conductive connection with the stator core in the groove.

[0008] In one embodiment of the present application, the first conducting member is provided with a clamping structure, the clamping structure cooperating with the groove and / or the shell to prevent the first conducting member from falling off the groove.

[0009] In one embodiment of the present application, the first conducting member comprises a sheet-like main body portion, and the locking structure is a barb structure formed on the edge of the main body portion.

[0010] In one embodiment of the present application, the first connecting portion of the first conducting member and the second connecting portion of the second conducting member form an electrically conductive connection within the stator, and the second connecting portion is an end portion or an intermediate portion of the second conducting member.

[0011] In one embodiment of the present application, when the first connecting portion and the second connecting portion are connected, one of them elastically presses or elastically clamps the other one to strengthen the electrically conductive connection therebetween.

[0012] In one embodiment of the present application, one of the first connecting portion and the second connecting portion is provided with a slot, and the other one is inserted into the slot in a tight-fitting manner.

[0013] In one embodiment of the present application, the first conducting member is provided with a stepped or outwardly convex limiting portion, which cooperates with the stator magnetic core or the housing to limit the depth of insertion of the first conducting member into the stator.

[0014] In one embodiment of the present application, the second conducting member is fixed to the circuit board; and the circuit board is substantially perpendicular to the rotating shaft.

[0015] In one embodiment of the present application, the housing has an open end facing the circuit board; the motor comprises a first end cover mounted to the open end, and the circuit board is accommodated in the first end cover; the housing and / or the first end cover is provided with a mounting hole for mounting the motor to a predetermined position; and the first end cover is provided with a connector for connecting with the circuit board.

[0016] In one embodiment of the present application, the first grounding portion extends out of the peripheral surface of the housing or extends out of the axial end of the housing away from the circuit board.

[0017] In one embodiment of the present application, the housing comprises a bottom portion and an annular outer wall extending from the edge of the bottom portion, and the stator magnetic core is mounted to the inner wall of the annular wall; and the bottom portion is provided with a first supporting structure for supporting the rotation of the rotating shaft.

[0018] In one embodiment of the present application, a second end cover is further included; the second end cover and the first end cover are respectively connected to the axial ends of the housing; and the second end cover is provided with a second supporting structure for supporting the rotation of the rotating shaft.

[0019] In an embodiment of the present application, the second end cover is further used for accommodating a load or a working head.

[0020] In a second aspect of the present application, an electric motor is provided, comprising a pump housing and the electric motor provided by the first aspect of the present application. Advantages

[0021] By implementing the present application, even if the motor housing is an insulator, the stator magnetic core can be grounded through the first conducting member, and the circuit board can be grounded through the second conducting member and the first conducting member. Both the manufacturing cost and the electromagnetic compatibility of the motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] To further disclose the technical contents of the present application, first refer to the drawings, in which:

[0023] Fig. 1 is a schematic diagram of the electric motor provided by an embodiment of the present application;

[0024] Fig. 2 is a longitudinal sectional view of the electric motor shown in Fig. 1;

[0025] Fig. 3 is an exploded schematic diagram of the electric motor shown in Fig. 1;

[0026] Fig. 4 is a schematic diagram of the stator magnetic core and the first end cover of the electric motor shown in Fig. 1;

[0027] Fig. 5 is a schematic diagram of the circuit board and the second conducting member installed in the first end cover shown in Fig. 4;

[0028] Fig. 6 is a schematic diagram of the first conducting member used by the electric motor shown in Fig. 1;

[0029] Fig. 7 is a schematic diagram of the insertion state of the first conducting member and the second conducting member of the electric motor shown in Fig. 1. Embodiment of the present application

[0030] The technical solutions in the embodiments of the present application will be described below in combination with the drawings of the present application.

[0031] Please refer to Figs. 1 to 3, the electric motor 100 provided by an embodiment of the present application comprises a stator and a rotor. The stator comprises a housing 21 and a stator magnetic core 26 installed to the inner wall of the housing 21. The stator magnetic core 26 comprises an annular yoke portion, a plurality of teeth 27 extending inwardly from the yoke portion, and a stator winding (not shown in the figure) wound to the teeth 27. The rotor comprises a rotor shaft 31 and a rotor core fixed to the rotor shaft 31, the rotor core being surrounded by the stator magnetic core 26, specifically, the rotor core being surrounded by the teeth 27 of the stator magnetic core 26. In this embodiment, the rotor core comprises a rotor magnetic core 33 and a permanent magnet 34 installed to the rotor magnetic core 33. Understandably, the rotor core can be formed by the permanent magnet alone.

[0032] In the embodiment, the housing 21 is made of insulating material, for example, the housing 21 is made of plastic, so as to manufacture and reduce the cost. The housing 21 comprises a bottom 22 and an annular wall extending from the edge of the bottom, and the stator core 26 is mounted to the inner wall of the annular wall. The bottom 22 is provided with a first supporting structure 23 for supporting the rotation of the rotating shaft 31. In the embodiment, the first supporting structure 23 is a bush structure; it can be understood that the first supporting structure 23 can also be a bearing seat and a rolling bearing mounted to the bearing seat.

[0033] The motor 100 comprises a first conducting member 61 electrically connected with the stator core 26. The first conducting member 61 has a first grounding portion 65 (see Fig. 6) extending out of the housing 21, for electrically connecting with the outside. In the embodiment, the first grounding portion is a free end, which has appropriate elasticity to enhance the electrical connection with the outside. A certain gap is provided between the first grounding portion and the outer surface of the motor, so that the first grounding portion has a space for elastic deformation in the radial direction. Through the structure, even if the housing 21 is made of insulating material, the stator core 26 can be grounded through the first conducting member 61, which protects the internal components of the motor and reduces the electromagnetic interference to the outside.

[0034] The motor 100 further comprises a second conducting member 51 and a circuit board 43 mounted to one end of the motor. The second conducting member 51 is electrically connected with the grounding position of the circuit board 43. A part of the second conducting member 51 is inserted into the stator and electrically connected with the first conducting member 61, preferably, one end of the second conducting member 51 is inserted into the stator and electrically connected with the first conducting member 61; however, it can be understood that the non-end part of the second conducting member 51, for example, the middle part of the second conducting member 51 can be inserted into the stator and electrically connected with the first conducting member 61. Through the structure, even if the housing 21 is made of insulating material, the grounding position of the circuit board 43 can be grounded through the second conducting member 51 and the first conducting member 61, which protects the internal components of the motor and reduces the electromagnetic interference to the outside. The second conducting member 51 can be detachably inserted into the stator core 26, or can be fixed to the stator core 26, for example, the second conducting member 51 can be injection molded to the stator core 26, and becomes an integral whole with the stator core 26 and cannot be detached. The electrical connection between the second conducting member 51 and the first conducting member 61 is formed by insertion, and it can be understood that the second conducting member 51 and the first conducting member 61 can be detachably inserted, or can be fixedly connected after insertion.

[0035] In the embodiment, the first conducting member 61 is located between the inner wall of the housing 21 and the outer surface of the stator core 26. The outer surface of the stator core 26 is provided with a groove 28 extending along the axial direction of the motor. The first conducting member 61 is mounted to the groove 28 and electrically connected with the stator core 26 in the groove 28.

[0036] Referring to Figs. 3 to 6, the main body portion of the first conducting member 61 is received in the recess 28. In the present embodiment, the stator core 26 is formed by stacking a plurality of stator laminations in the axial direction of the motor, the stator laminations having notches corresponding to the recess 28, so that the plurality of stator laminations, when stacked, form the recess 28 which is concave in the radial direction and extends in the axial direction. Preferably, the axial cross section of the recess 28 is square or trapezoidal. The first conducting member 61 is inserted into the recess 28 of the stator core 26 in the axial direction. The first conducting member 61 is provided with a retaining structure to prevent the first conducting member 61 from falling out of the recess 28. In the present embodiment, the first conducting member 61 includes a sheet-like main body portion 62, and the retaining structure is formed by barbs 64 formed on both side edges of the sheet-like main body portion 62. The main body portion 62 has a maximum outer diameter at a position corresponding to the retaining structure, which is slightly larger than the slot width of the recess 28, so that the barbs 64 form a tight or slightly tight fit with the recess 28, thereby stably receiving the main body portion 62 in the recess 28 and forming an electrically conductive connection between the barbs 64 and the side walls of the recess 28 of the stator core 26. In the present embodiment, the barbs 64 have a guide slope 64a for facilitating insertion of the first conducting member 61 into the recess 28 in a first direction, and a fall-preventing slope 64b for preventing the first conducting member 61 from falling out of the recess 28 in a direction opposite to the first direction. Since the main body portion 62 is clamped between the housing 21 and the stator core 26, it is understood that the retaining structure of the main body portion 62 can be cooperated with the housing 21 and / or the recess 28 to prevent the first conducting member 61 from falling out. The first conducting member 61 is further provided with a stepped or outwardly protruding limiting portion 66 which cooperates with the stator core 26 or the housing 21 to limit the depth of insertion of the first conducting member 61 into the stator during insertion of the first conducting member 61 into the recess 28 in the first direction.

[0037] In the present embodiment, the second conducting member 51 is fixed to the circuit board 43 which is substantially perpendicular to the rotating shaft 31. During assembly, the first conducting member 61 and the second conducting member 51 are inserted into the stator from both axial ends of the stator, respectively. The first connecting portion 67 of the first conducting member 61 and the second connecting portion 55 of the second conducting member 51 form electrically conductive connections in the stator.

[0038] Preferably, when the first connecting part 67 is connected with the second connecting part 55, one of them elastically presses or elastically clamps the other one to strengthen the conductive connection between them. As shown in FIG. 6 and FIG. 7, in this embodiment, the first connecting part 67 is provided with a slot 68, and the second connecting part 55 is inserted into the slot 68 and elastically clamped by the slot 68 to form a tight-fitting connection. Specifically, the first connecting part 67 forms two free arms 67a which form a U-shaped slot 68. The end of the free arm 67a close to the slot 68 side has a guide surface 67b, so that the slot 68 has a larger width at the entrance, facilitating the insertion of the second connecting part 55, and after the second connecting part 55 is inserted, its width is elastically clamped on both sides by the two free arms 67a, accordingly, the two free arms 67a are stretched to contact the side wall of the groove 28 of the stator core 26, forming a conductive connection. Preferably, the main body part 62 is provided with a circular arc-shaped notch 67c on both sides close to the bottom of the slot 68, so that the two free arms 67a are more easily elastically deformed. Understandably, the slot can also be provided on the second connecting part 55, and the slot is tightly connected with the first connecting part 67.

[0039] In this embodiment, the first conducting part 61 is sequentially provided with a first bending part 63 and a second bending part 69 between the main body part 62 and the first grounding part 65, the first bending part 63 is radially outwardly bent, and the second bending part 69 is axially downwardly bent. In this way, the first grounding part 65 has greater elasticity and greater tolerance to the size tolerance of the external environment. Similarly, the second conducting part 51 is also sequentially provided with a third bending part 53 and a fourth bending part 59, the third bending part 53 is radially outwardly bent, and the fourth bending part 59 is axially downwardly bent, to increase the elasticity and size tolerance of the second connecting part 55.

[0040] Please refer back to FIG. 1 to FIG. 3, in this embodiment, the housing 21 has an open end facing the circuit board 43. The motor 100 includes a first end cover 41 mounted to the open end. The circuit board 43 is received in the first end cover 41. The first end cover 41 is provided with a connector 48 connected with the circuit board 43, specifically, the connector 48 is provided with a plurality of terminals 49 for conductive connection with the corresponding positions of the circuit board 43.

[0041] The first end cover 41 comprises an outer cover 45 and an inner cover 46. The inner cover 46 is made of plastic and is connected to the housing 21 by laser welding to ensure the sealing of the interior. The outer cover 45 is made of metal to improve the electromagnetic compatibility (EMC) level of the motor. The housing 21 and / or the first end cover 41 is provided with a mounting hole 42 for a fastener to pass through, for fixing the motor 100 to a predetermined position. In the embodiment, the outer cover 45 of the first end cover 41 and the housing 21 are both provided with a mounting hole 42 for a fastener to pass through. In one application, the predetermined position is a recess. The motor 100 shown in Fig. 1 is inserted into the recess from top to bottom, and then the motor 100 is fixed to the recess by connecting members such as screws passing through the mounting holes 42. The first grounding portion 65 of the first conducting member 61 is in conductive connection with the wall of the recess, thereby achieving grounding. Preferably, the first grounding portion 65 extends beyond the peripheral surface of the housing 21 or extends beyond the axial end of the housing 21 away from the first end cover 41. The first grounding portion 65 is provided with a radially outward protrusion to further enhance the conductive connection with the outside.

[0042] In one embodiment, the motor 100 further comprises a second end cover 71. The second end cover 71 and the first end cover 41 are respectively connected to the axial ends of the housing 21. The second end cover 71 is provided with a second support structure 73 for supporting the rotation of the rotating shaft 31. The second support structure 73 is a bushing structure or a rolling bearing structure.

[0043] In one embodiment, the second end cover 71 is also used to accommodate a load or a working head. For example, the motor 100 can be used as an electric pump, and the second end cover 71 serves as a pump housing or a part of the pump housing, and the load or working head is accommodated in the second end cover 71. When the electric pump is used as an oil pump, it is assembled into a corresponding recess in a car. The inner wall of the recess is conductive (or has a conductive part). After the oil pump is assembled, the first grounding portion 65 of the motor 100 is in conductive connection with the conductive part of the inner wall of the recess, thereby grounding the stator core 26 of the motor and the grounding portion of the circuit board 43. In this application, the first support structure 23 and the second support structure 73 can be a bushing structure to simplify the overall structure.

[0044] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electric machine comprising a stator and a rotor; the stator comprising a housing, a stator core mounted to the inner wall of the housing; the rotor comprising a rotor shaft, a rotor core fixed to the rotor shaft, the rotor core being surrounded by the stator core; characterized in that: the housing is an insulating member; the electric machine comprises a first conducting member, the first conducting member being in electrically conductive connection with the stator core, the first conducting member having a first grounding portion extending out of the housing for electrically conductive connection with the outside; the electric machine further comprises a second conducting member and a circuit board mounted to one end of the electric machine, the second conducting member being in electrically conductive connection with the grounding position of the circuit board, a portion of the second conducting member being inserted into the stator and in electrically conductive connection with the first conducting member.

2. The electric machine of claim 1, wherein, the first grounding portion is a free end and is elastic to enhance the electrically conductive connection with the outside.

3. The electric machine of claim 1, wherein, the first conducting member is located between the inner wall of the housing and the outer surface of the stator core.

4. The electric machine of claim 1, wherein, the outer surface of the stator core is provided with a groove, the groove extending along the axial direction of the electric machine; the first conducting member is mounted to the groove and in electrically conductive connection with the stator core in the groove.

5. The electric machine of claim 4, wherein, the first conducting member is provided with a clamping structure, the clamping structure cooperating with the groove and / or the housing to prevent the first conducting member from falling off the groove.

6. The electric machine of claim 5, wherein, the first conducting member comprises a sheet-shaped main body portion, and the clamping structure is a barb structure formed on the edge of the main body portion.

7. The electric machine of claim 1, wherein, the first connecting portion of the first conducting member and the second connecting portion of the second conducting member form an electrically conductive connection in the stator, the second connecting portion being one end portion or an intermediate portion of the second conducting member.

8. The electric machine of claim 7, wherein, when the first connecting portion and the second connecting portion are connected, one of them elastically presses or elastically clamps the other one to enhance the electrically conductive connection therebetween.

9. The electric machine of claim 7, wherein, one of the first connecting portion and the second connecting portion is provided with a slot, and the other one is inserted into the slot in a tight-fitting manner.

10. The electric machine of claim 7, wherein, the first conducting member is provided with a stepped or outwardly protruding limiting portion, the limiting portion cooperating with the stator core or the housing to limit the depth of insertion of the first conducting member into the stator.

11. The electric machine of claim 1, wherein, the first grounding portion extends out of the peripheral surface of the housing or extends out of the axial end of the housing away from the circuit board.

12. An electric pump comprising a pump housing, characterized in that the pump housing is connected with the electric machine as claimed in any one of claims 1-11.

Images