Plastic package motor

Abstract

The utility model discloses a plastic package motor, which comprises a rotating shaft, a rotor assembly, a plastic package stator, a front end cover, a rear end cover and a control box assembly, the plastic package stator comprises a stator iron core, end part insulators arranged at two ends of the stator iron core, stator windings wound on the end part insulators and a plastic package body, and the plastic package body wraps the stator iron core, the end part insulators and the stator windings. The front end cover and the rear end cover are installed at the two ends of the plastic package body, the rotating shaft is installed on the front end cover and the rear end cover through bearings, the control box assembly is installed on the rear end cover and comprises a control box shell and a control circuit board, and the stator iron core and the rear end cover are in electric conduction connection through a first conduction piece. And the front end cover, the rear end cover and the control box shell are in electric conduction connection through a second conduction piece. Through the first conduction piece and the second conduction piece, the front end cover, the stator core, the rear end cover and the control box are electrically conducted with one another, the induction potential difference between the components is balanced, and the adverse effect of the induction potential on the motor is eliminated.

Description

Technical Field

[0001] The utility model relates to a plastic-sealed motor. Background Art

[0002] Existing plastic-encapsulated motors consist of a rotating shaft, a rotor assembly, a plastic-encapsulated stator, a front cover, a rear cover, and a control box assembly. The plastic-encapsulated stator includes a stator core, stator windings wound around the stator core, and a plastic body encapsulating the stator core and stator windings. The front and rear covers are mounted at either end of the plastic body. Each front and rear cover contains a bearing chamber containing bearings. The rotor assembly is mounted within the plastic-encapsulated stator and connected to the rotating shaft. The rotating shaft supports are mounted on two bearings. The control box assembly is mounted on the rear cover, which houses the control box housing and control circuit board. During operation, induced potential differences commonly exist between key components of plastic-encapsulated motors, such as between the front and rear covers, between the rear cover and the core, and between the rear cover and the control box. These induced potential differences have the following adverse effects on motor operation: 1. They increase bearing shaft voltage, increasing the risk of bearing electrocorrosion and shortening the motor's service life; 2. They affect the EMC / EMI performance of the motor controller, increasing the risk of motor failure. Utility Model Content

[0003] The utility model provides a plastic-sealed motor, which is used to solve the problem in the prior art that induced potential differences generally exist between key components of the plastic-sealed motor.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] The purpose of the utility model is to provide a plastic-encapsulated motor, comprising a rotating shaft, a rotor assembly, a plastic-encapsulated stator, a front end cover, a rear end cover and a control box assembly, the plastic-encapsulated stator comprising a stator core, end insulations installed at both ends of the stator core, a stator winding wound on the end insulation, and a plastic-encapsulated body, the plastic-encapsulated body wraps the stator core, the end insulations and the stator winding, the front end cover and the rear end cover are installed at both ends of the plastic-encapsulated body, bearing chambers are provided in the front end cover and the rear end cover, bearings are installed in the bearing chambers, the rotor assembly is installed in the plastic-encapsulated stator and connected to the rotating shaft, the rotating shaft support is installed on two bearings, the control box assembly is installed on the rear end cover, the control box assembly comprises a control box shell and a control circuit board, and is characterized in that: the stator core and the rear end cover are electrically connected by a first conductive member, and the front end cover, the rear end cover and the control box shell are electrically connected by a second conductive member.

[0006] The above-mentioned first conductive part includes a first connecting piece and a second connecting piece. The first connecting piece is plastic-sealed in the plastic package body. The two ends of the first connecting piece are a welding end and an exposed end respectively. The welding end is welded to the stator core, and the exposed end protrudes out of the plastic package body and is connected to the first end of the second connecting piece. The second end of the second connecting piece is connected to the rear end cover.

[0007] The first end portion of the second connecting piece is provided with a slot, and the exposed end of the first connecting piece is stuck in the slot.

[0008] The end surface of the end insulation is provided with a mounting groove, the stator winding terminal and the first connecting piece are installed in the mounting groove, and the welding end of the first connecting piece is welded to the outer surface of the stator core.

[0009] The exposed end of the first connecting piece is welded to the first end of the second connecting piece.

[0010] The second end of the second connecting piece is fixedly connected to the rear end cover by screws.

[0011] The above-mentioned second conductive member includes a third connecting piece, the upper end of the third connecting piece is fixed on the front end cover, the third connecting piece extends axially along the outer wall of the plastic-sealed stator to the rear end cover, and the lower end of the third connecting piece is divided into a first fork piece and a second fork piece, the end of the first fork piece is fixed on the rear end cover, and the end of the second fork piece is fixed on the control box housing.

[0012] The upper end of the third connecting piece, the end of the first forked piece and the end of the second forked piece are fixedly connected to the front cover, the rear cover and the control box housing by screws respectively.

[0013] An axial groove is provided on the outer side surface of the plastic package body, and the third connecting piece is stuck in the axial groove.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The plastic-encapsulated motor comprises a rotating shaft, a rotor assembly, a plastic-encapsulated stator, a front cover, a rear cover, and a control box assembly. The plastic-encapsulated stator comprises a stator core, end insulation mounted at both ends of the stator core, a stator winding wound on the end insulation, and a plastic encapsulation body. The plastic encapsulation body encapsulates the stator core, end insulation, and stator winding. The front cover and rear cover are mounted at both ends of the plastic encapsulation body. The front cover and rear cover each contain a bearing chamber, in which bearings are mounted. The rotor assembly is mounted within the plastic-encapsulated stator and connected to the rotating shaft. The rotating shaft support is mounted on two bearings. The control box assembly is mounted on the rear cover. The control box assembly comprises a control box housing and a control circuit board. The stator core and rear cover are electrically connected via a first conductive member, and the front cover, rear cover, and control box housing are electrically connected via a second conductive member. The first and second conductive members provide electrical continuity between the front cover, stator core, rear cover, and control box, thereby balancing the induced potential difference between the components and eliminating the adverse effects of the induced potential on the motor.

[0016] 2. Other advantages of the present invention are described in detail in the embodiment section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a plastic-encapsulated motor provided in an embodiment of the present utility model;

[0018] Figure 2 This is a side view of the plastic-encapsulated motor;

[0019] Figure 3 for Figure 2 AA cross-sectional view;

[0020] Figure 4 for Figure 3 Enlarged view of point B;

[0021] Figure 5 The matching intention of the stator core, end insulation and first connecting piece in the plastic-encapsulated motor;

[0022] Figure 6 This is a schematic diagram of the structure of the third connecting piece in the plastic-encapsulated motor;

[0023] Figure 7 This is a structural diagram of the first conductive component in the plastic-encapsulated motor. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figures 1 to 7 As shown, this embodiment provides a plastic-encapsulated motor, including a rotating shaft 5, a rotor assembly, a plastic-encapsulated stator 1, a front end cover 2, a rear end cover 3 and a control box assembly. The plastic-encapsulated stator 1 includes a stator core 11, end insulation 12 installed at both ends of the stator core 11, a stator winding wound on the end insulation 12, and a plastic-encapsulated body 13. The plastic-encapsulated body 13 wraps the stator core 11, the end insulation 12 and the stator winding. The front end cover 2 and the rear end cover 3 are installed at both ends of the plastic-encapsulated body 13. Bearing chambers are provided in the front end cover 2 and the rear end cover 3. Bearings are installed in the bearing chambers. The rotor assembly is installed in the plastic-encapsulated stator 1 and connected to the rotating shaft 5. The rotating shaft 5 is supported and installed on two bearings. The control box assembly is installed on the rear end cover 3. The control box assembly includes a control box shell 4 and a control circuit board. It is characterized in that: the stator core 11 and the rear end cover 3 are electrically connected through a first conductive member, and the front end cover 2, the rear end cover 3 and the control box shell 4 are electrically connected through a second conductive member.

[0026] The plastic-encapsulated motor electrically connects the front cover 2, the stator core 11, the rear cover 3 and the control box housing 4 through the first conductive member and the second conductive member, thereby balancing the induced potential difference between the components and eliminating the adverse effects of the induced potential on the motor.

[0027] The above-mentioned first conductive member includes a first connecting piece 6 and a second connecting piece 7. The first connecting piece 6 is plastic-sealed in the plastic sealing body 13. The two ends of the first connecting piece 6 are a welding end 61 and an exposed end 62 respectively. The welding end 61 is welded to the stator core 11, and the exposed end 62 protrudes from the outside of the plastic sealing body 13 and is connected to the first end 71 of the second connecting piece 7. The second end 72 of the second connecting piece 7 is connected to the rear end cover 3.

[0028] The first end portion 71 of the second connecting piece 7 is provided with a slot 73, and the exposed end 62 of the first connecting piece 6 is locked in the slot 73. The connection between the first connecting piece 6 and the second connecting piece 7 is simple.

[0029] The end surface of the end insulator 12 is provided with a mounting groove 121. The stator winding terminal 14 and the first connecting piece 6 are mounted in the mounting groove 121. The welding end 61 of the first connecting piece 6 is welded to the outer surface of the stator core 11. The first connecting piece 6 is easy to fix.

[0030] The exposed end 62 of the first connecting piece 6 is welded to the first end 71 of the second connecting piece 7, thereby further ensuring electrical conduction between the first connecting piece 6 and the second connecting piece 7.

[0031] The second end portion 72 of the second connecting piece 7 is fixedly connected to the rear end cover 3 by screws. The second connecting piece 7 is conveniently connected to the rear end cover 3.

[0032] The second conductive member includes a third connecting piece 8. The upper end 81 of the third connecting piece 8 is fixed to the front cover 2. The third connecting piece 8 extends axially along the outer wall of the plastic-encapsulated stator 1 to the rear cover 3. The lower end of the third connecting piece 8 is divided into a first fork piece 82 and a second fork piece 83. The end of the first fork piece 82 is fixed to the rear cover 3, and the end of the second fork piece 83 is fixed to the control box housing 4. The third connecting piece 8 has a simple structure and is easy to manufacture.

[0033] The upper end 81 of the third connecting piece 8, the end of the first forked piece 82 and the end of the second forked piece 83 are fixedly connected to the front cover 2, the rear cover 3 and the control box housing 4 by screws respectively. The third connecting piece 8 is easy to install.

[0034] An axial groove 131 is provided on the outer side surface of the plastic package body 13 , and the third connecting piece 8 is clamped in the axial groove 131 .

[0035] The plastic-encapsulated motor described in this embodiment effectively reduces the shaft voltage of the motor bearings, reduces the risk of bearing electrical corrosion, and increases the life of the motor; the potential of each motor component is balanced, thereby improving the EMC / EMI anti-interference capability of the motor.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A plastic-encapsulated motor, comprising a rotating shaft (5), a rotor assembly, a plastic-encapsulated stator (1), a front end cover (2), a rear end cover (3) and a control box assembly, wherein the plastic-encapsulated stator (1) comprises a stator core (11), end insulations (12) mounted at both ends of the stator core (11), a stator winding wound on the end insulations (12), and a plastic-encapsulated body (13), wherein the plastic-encapsulated body (13) wraps the stator core (11), the end insulations (12) and the stator winding, the front end cover (2) and the rear end cover (3) are mounted at both ends of the plastic-encapsulated body (13), a bearing chamber is provided in each of the front end cover (2) and the rear end cover (3), a bearing chamber is mounted in each of the bearing chambers, the rotor assembly is mounted in the plastic-encapsulated stator (1) and connected to the rotating shaft (5), the rotating shaft (5) is supported and mounted on two bearings (22), the control box assembly is mounted on the rear end cover (3), the control box assembly comprises a control box housing (4) and a control circuit board, and is characterized in that: The stator core (11) and the rear end cover (3) are electrically connected via a first conductive member, and the front end cover (2), the rear end cover (3) and the control box housing (4) are electrically connected via a second conductive member.

2. The plastic-encapsulated motor according to claim 1, characterized in that: The first conductive member comprises a first connecting piece (6) and a second connecting piece (7), the first connecting piece (6) being plastic-sealed in a plastic-sealed body (13), the two ends of the first connecting piece (6) being respectively a welding end (61) and an exposed end (62), the welding end (61) being welded to the stator core (11), the exposed end (62) protruding from the plastic-sealed body (13) and connected to a first end (71) of the second connecting piece (7), and the second end (72) of the second connecting piece (7) being connected to the rear end cover (3).

3. The plastic-encapsulated motor according to claim 2, characterized in that: The first end portion (71) of the second connecting piece (7) is provided with a slot (73), and the exposed end (62) of the first connecting piece (6) is locked in the slot (73).

4. The plastic-encapsulated motor according to claim 3, characterized in that: The end surface of the end insulation (12) is provided with a mounting groove (121), the stator winding connection terminal (14) and the first connecting piece (6) are installed in the mounting groove (121), and the welding end (61) of the first connecting piece (6) is welded to the outer surface of the stator core (11).

5. The plastic-encapsulated motor according to claim 4, characterized in that: The exposed end (62) of the first connecting piece (6) and the first end (71) of the second connecting piece (7) are welded together.

6. The plastic-encapsulated motor according to claim 5, characterized in that: The second end portion (72) of the second connecting piece (7) is fixedly connected to the rear end cover (3) via screws.

7. The plastic-encapsulated motor according to any one of claims 1 to 6, characterized in that: The second conductive member includes a third connecting piece (8), the upper end portion (81) of the third connecting piece (8) is fixed on the front end cover (2), the third connecting piece (8) extends axially along the outer wall of the plastic-sealed stator (1) to the rear end cover (3), and the lower end of the third connecting piece (8) is provided with a first fork piece (82) and a second fork piece (83), the end portion of the first fork piece (82) is fixed on the rear end cover (3), and the end portion of the second fork piece (83) is fixed on the control box housing (4).

8. The plastic-encapsulated motor according to claim 7, characterized in that: The upper end portion (81) of the third connecting piece (8), the end portion of the first forked piece (82) and the end portion of the second forked piece (83) are fixedly connected to the front end cover (2), the rear end cover (3) and the control box housing (4) respectively by screws.

9. The plastic-encapsulated motor according to claim 8, characterized in that: An axial groove (131) is provided on the outer side surface of the plastic package body (13), and the third connecting piece (8) is stuck in the axial groove (131).

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