Motor and electric pump using same

Abstract

The invention relates to a motor and an electric pump using the motor, the motor comprises a rotor and a stator arranged around the rotor, the stator comprises a stator magnetic core, a first coil holder and a second coil holder, the first coil holder and the second coil holder are respectively arranged at two shaft ends of the stator magnetic core, and the stator magnetic core is provided with a plurality of stator teeth extending inwards; the radial inner surfaces of the plurality of stator teeth form an annular accommodating hole; the first coil holder and the second coil holder respectively comprise a first cylindrical part and a second cylindrical part, the first cylindrical part and the second cylindrical part are respectively arranged at two ends of the annular accommodating hole, and the inner wall of the first cylindrical part, the inner wall of the second cylindrical part and the accommodating hole form a rotor accommodating cavity; and the inner wall of the rotor accommodating cavity is provided with a waterproof layer which at least covers the inner wall of the accommodating hole and the joints of the first cylindrical part and the second cylindrical part and the accommodating hole. A waterproof layer is arranged on the inner wall of a rotor accommodating cavity formed by a stator; the waterproof effect in the stator is ensured, and electromagnetic air gaps are reduced, so that the motor and the electric pump have relatively small motor sizes.

Description

Technical Field

[0001] This invention relates to an electric motor that can be used in a fluid pump, and more particularly to an electric motor and an electric pump using the electric motor. Background Technology

[0002] Traditional fluid pumps have complex waterproof sleeve structures between the stator and rotor of the motor, resulting in a large electromagnetic air gap and a relatively large motor size. Therefore, it is necessary to design a motor structure that can reduce the electromagnetic air gap between the stator and rotor. Summary of the Invention

[0003] The purpose of this invention is to provide a stator, an external stator motor, and an electric pump that can reduce the electromagnetic air gap.

[0004] The first aspect of the present invention provides an electric motor, including a rotor and a stator arranged around the rotor. The stator includes a stator core and a first wire frame and a second wire frame respectively disposed at two ends of the stator core. The stator core has a plurality of inwardly extending stator teeth. The radial inner surfaces of the plurality of stator teeth form an annular receiving hole. The first wire frame and the second wire frame respectively include a first cylindrical portion and a second cylindrical portion, which are respectively installed at both ends of the annular receiving hole. The inner walls of the first cylindrical portion and the second cylindrical portion form a rotor receiving cavity with the annular receiving hole. The inner wall of the rotor receiving cavity is provided with a waterproof layer. The waterproof layer at least covers the inner wall of the annular receiving hole and the connection between the first cylindrical portion, the second cylindrical portion and the annular receiving hole.

[0005] Furthermore, the radial inner ends of two adjacent stator teeth are connected together at adjacent locations, making the wall of the annular receiving hole a closed annular surface; the waterproof layer at least covers the closed annular surface and the connection between the closed annular surface and the first cylindrical portion and the second cylindrical portion.

[0006] Furthermore, the inner surface of the first cylindrical portion and the inner surface of the second cylindrical portion are flush with the wall of the annular receiving hole.

[0007] Furthermore, the inner hole of the first cylindrical part is a through hole, and the first cylindrical part is sealed to the rotor support by a sealing ring at the end away from the stator core to form a sealed rotor receiving cavity.

[0008] Furthermore, the inner hole of the second cylindrical part is a blind hole, and it has an integrally formed cylindrical bottom, which serves as the bottom of the rotor receiving cavity.

[0009] Furthermore, the inner hole of the second cylindrical part is a blind hole, and it has a split-formed cylindrical bottom. The cylindrical bottom is sealed to the end of the second cylindrical part away from the stator core, serving as the bottom of the rotor receiving cavity; the cylindrical bottom is a heat conductor.

[0010] Furthermore, a groove is formed between adjacent stator teeth; the first wire frame and the second wire frame each include a plurality of first toothed shoes and a plurality of second toothed shoes, the radial inner ends of the plurality of first toothed shoes are connected to the first cylindrical portion, and the radial inner ends of the plurality of second toothed shoes are connected to the second cylindrical portion; the first toothed shoes and the second toothed shoes are respectively sleeved from the two axial ends of the stator onto the corresponding stator teeth to cover the axial surface of the stator teeth and the surface of the groove.

[0011] Furthermore, the stator core also includes an annular yoke, which is separately formed from the stator teeth. The annular yoke is sleeved on the outside of the plurality of stator teeth and connected to the radial outer ends of the plurality of stator teeth. The outer diameter of one of the first wire frame and the second wire frame is substantially equal to the inner diameter of the annular yoke, and the other of the first wire frame and the second wire frame has a support portion for supporting an axial end face of the annular yoke.

[0012] Furthermore, the motor also includes a housing, which includes a cylindrical receiving shell and a top cover. The top cover is installed to the open end of the receiving shell, and the outer stator is installed to the inner wall of the receiving shell. The top cover is sealed to the first wire frame. The top cover serves as a rotor support and has a support portion through which the rotor shaft of the inner rotor passes.

[0013] Furthermore, the motor also includes a printed circuit board; the printed circuit board is disposed on the outer side of the bottom of the second cylindrical portion, and the bottom of the cylindrical portion is a heat conductor.

[0014] A second aspect of the present invention provides an electric pump for pumping fluid, the electric pump comprising a pump housing, an impeller disposed within the pump housing, and a motor as described in the first aspect, wherein the impeller is driven by the rotor shaft of an inner rotor.

[0015] Furthermore, the pump casing forms a pump cavity above the upper cover of the motor housing, the impeller is housed in the pump cavity, the upper cover is provided with at least one through hole to connect the pump cavity and the rotor housing cavity, and a guide groove is provided axially inside the rotor shaft, the guide groove connecting the pump cavity and the rotor housing cavity.

[0016] Compared with the prior art, the inner wall of the rotor housing cavity formed by the stator of the present invention is provided with a waterproof layer; while ensuring the waterproofness of the stator interior, it reduces the electromagnetic air gap, so that the external stator motor and electric pump have relatively small motor size. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of an electric pump according to an embodiment of the present invention; Figure 2 yes Figure 1A longitudinal section schematic diagram of the electric pump shown. Figure 3 yes Figure 1 The diagram shown is a schematic of the electric pump after removing the pump casing, impeller, and top cover. Figure 4 This is a three-dimensional schematic diagram of the stator and inner rotor according to an embodiment of the present invention; Figure 5 yes Figure 4 A schematic diagram of the stator after the annular yoke has been removed; Figure 6 yes Figure 5 The schematic diagram is a schematic diagram of the stator after further removal of the first and second wire frames; Figure 7 This is a schematic diagram of the stator core according to an embodiment of the present invention; Figure 8 This is a three-dimensional schematic diagram of the first wire frame according to an embodiment of the present invention; Figure 9 This is a three-dimensional schematic diagram of the second wire frame according to an embodiment of the present invention.

[0018] Label Explanation: 1. Pump casing; 2. Impeller; 5. Drive motor; 6. Sealing ring 51. Outer shell; 511. Containing shell; 512. Top cover; 53. Inner rotor; 531. Rotor shaft; 55. Stator; 551. Stator core; 551a. Stator tooth; 551b. Annular yoke; 551c. Slot; 551d. Annular receiving hole; 552. First wire frame; 552a. First cylindrical portion; 552b. First toothed shoe; 553. Second wire frame; 553a. Second tubular section; 553b. Second toothed shoe; 555. Rotor receiving cavity; 56. Printed circuit board. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please refer to Figure 1 and Figure 2As shown, the electric pump 100 of this embodiment of the invention is used to pump fluid (e.g., coolant), and includes a pump casing 1, an impeller 2 disposed in the pump casing 1, and a motor 5 for driving the impeller 2.

[0021] Please refer to Figure 2 and Figure 3 In this design, motor 5 is an external stator motor. Motor 5 includes a housing 51, a stator 55 disposed on the housing 51, and a rotor 53 surrounded by the stator. Impeller 2 is driven by the rotor shaft 531 of rotor 53. Please refer to [reference needed]. Figure 2 The outer casing 51 includes a cylindrical receiving shell 511 and a top cover 512, with the top cover 512 mounted to the open end of the receiving shell 511. In this embodiment, the top cover 512 serves as a rotor support for the rotor 53. This rotor support has a support portion through which the rotor shaft 531 of the rotor 53 passes. The pump housing 1 is disposed above the motor 5. Specifically, the pump chamber of the pump housing 1 is located above the top cover 512 of the outer casing 51; the impeller 2 is housed within the pump chamber.

[0022] Please refer to Figure 3 , Figure 4 and Figure 5 In this embodiment, the stator 55 includes a stator core 551, a first wire frame 552 and a second wire frame 553 respectively disposed at the two shaft ends of the stator core 551.

[0023] Please refer to the following: Figure 5 , Figure 6 and Figure 7 The stator core 551 includes a plurality of inwardly extending stator teeth 551a and an annular yoke 551b surrounding the stator teeth 551a. In this embodiment, the annular yoke 551b is separately formed from the stator teeth 551a; the annular yoke 551b is sleeved on the outside of the plurality of stator teeth 551a, and the annular yoke 551b is connected to the radially outer ends of the plurality of stator teeth 551a.

[0024] Specifically, annular receiving holes 551d are formed on the radial inner surfaces of a plurality of stator teeth 551a. Preferably, the radial inner ends of two adjacent stator teeth 551a are connected together at adjacent locations, so that the hole wall of the annular receiving hole 551d is a closed annular surface.

[0025] Please refer to Figure 8 and Figure 9 The first wire frame 552 includes a first cylindrical portion 552a; the second wire frame 553 includes a second cylindrical portion 553a. Please refer to [reference needed]. Figure 4 , Figure 5 , Figure 8 and Figure 9The first cylindrical portion 552a and the second cylindrical portion 553a are respectively installed at both ends of the annular receiving hole 551d. The inner walls of the first cylindrical portion 552a and the second cylindrical portion 553a, together with the annular receiving hole 551d, form a rotor receiving cavity 555. In this embodiment, the inner wall of the rotor receiving cavity 555 is provided with a waterproof layer; and the waterproof layer at least covers the inner wall of the annular receiving hole 551d and the connection between the first cylindrical portion 552a and the second cylindrical portion 553a and the annular receiving hole 551d. Specifically, the waterproof layer at least covers the closed annular surface of the annular receiving hole 551d and the connection between the closed annular surface and the first cylindrical portion 552a and the second cylindrical portion 553a. In this way, a waterproof structure for the stator 55 is formed, preventing fluids (such as coolant) entering the rotor receiving cavity 555 from further intruding into the stator 55.

[0026] Preferably, the inner surface of the first cylindrical portion 552a and the inner surface of the second cylindrical portion 553a are flush with the wall of the annular receiving hole 551d. This ensures that the waterproof layer on the inner wall of the rotor receiving cavity 555 adheres to the connection between the first cylindrical portion 552a, the second cylindrical portion 553a, and the annular receiving hole 551d, thus maintaining the waterproof effect of the waterproof layer.

[0027] Please refer to Figure 8 The inner hole of the first cylindrical portion 552a is a through hole. Please refer to... Figure 9 The inner hole of the second cylindrical part 553a is a blind hole; the second cylindrical part 553a has an integrally formed cylindrical bottom, which serves as the bottom of the rotor receiving cavity 555.

[0028] Further, please refer to Figure 2 , Figure 5 and Figure 9 The motor 5 also includes a printed circuit board 56. The printed circuit board 56 is disposed on the outer side of the bottom of the second cylindrical portion 553a. Preferably, the printed circuit board 56 is attached to the outer end face of the bottom of the second cylindrical portion 553a. In another more preferred embodiment, the bottom of the second cylindrical portion 553a is a heat conductor, which is sealed to the end of the second cylindrical portion 553a away from the stator core 551 and serves as the bottom of the rotor receiving cavity 555. This improves the heat dissipation and cooling effect of the printed circuit board 56.

[0029] Further, please refer to Figure 2The upper cover 512 of the housing 51 of the motor 5 is provided with at least one connecting hole 512a for connecting the pump chamber of the pump housing 1 and the rotor receiving cavity 555. An axially oriented guide groove 531a is provided inside the rotor shaft 531 of the rotor 53; the guide groove 531a connects the pump chamber of the pump housing 1 and the rotor receiving cavity 555. Pumping fluid (e.g., coolant) flows from the pump chamber of the pump housing 1 through the connecting hole 512a into the rotor receiving cavity 555 and flows to the bottom of the rotor receiving cavity 555. When the pumping fluid (e.g., coolant) in the rotor receiving cavity 555 reaches a certain volume, as the rotor shaft 531 rotates, the pumping fluid (e.g., coolant) returns to the pump chamber of the pump housing 1 along the guide groove 531a of the rotor shaft 531. This cycle continues, and the pumping fluid (e.g., coolant) can dissipate heat and cool the printed circuit board 56 located below the bottom of the rotor receiving cavity 555. Please refer to... Figure 2 and Figure 3 The stator 55 is installed inside the housing 511. Specifically, the annular yoke 551b of the stator core 551 is close to the inner wall of the housing 511. In this embodiment, the outer diameter of the first wire frame 552 is substantially equal to the inner diameter of the annular yoke 551b, allowing the annular yoke 551b to pass through the first wire frame 552 and be fitted onto the outside of several stator teeth 551a, thus bringing the annular yoke 551b close to the inner wall of the housing 511. The second wire frame 553 has a support portion for supporting an axial end face of the annular yoke 551b; allowing the annular yoke 551b to pass through the first wire frame 552 and be positioned and fixedly fitted onto the outside of several stator teeth 551a. Understandably, one of the first wire frame 552 and the second wire frame 553 has a support portion for supporting an axial end face of the annular yoke 551b; the outer diameter of one of the first wire frame 552 and the second wire frame 553 is substantially equal to the inner diameter of the annular yoke 551b.

[0030] Please refer to Figure 7 A slot 551c is formed between adjacent stator teeth 551a of the stator core 551. Please refer to [reference needed]. Figure 8 The first wire frame 552 includes a plurality of first toothed shoes 552b, the radially inner ends of which are connected to the first cylindrical portion 552a. Please refer to [reference needed]. Figure 9 The second wire frame 553 includes a plurality of second toothed shoes 553b, the radially inner ends of which are connected to the second cylindrical portion 553a. Please refer to [reference needed]. Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 9The first toothed shoe 552b and the second toothed shoe 553b are respectively fitted from the two axial ends of the stator core 551 onto the corresponding stator teeth 551a to cover the axial surface of the stator teeth 551a and the surface of the slots 551c. In this way, the stator coil is installed onto the first wire frame 552 and the second wire frame 553; and the stator core 551 and the stator coil are combined through the first wire frame 552 and the second wire frame 553.

[0031] Please refer to Figure 2 In addition to providing a waterproof layer on the inner wall of the rotor housing cavity 555 to waterproof one end and the circumference of the stator 55, a further sealing connection is needed between the upper cover 512 and the first wire frame 552 to seal and waterproof the other end of the stator 55. Specifically, the first cylindrical portion 552a of the first wire frame 552 is sealed to the upper cover 512 (i.e., the rotor support) at the end away from the stator core 551 via a sealing ring 6, thus sealing the opening end of the rotor housing cavity 555 with the upper cover 512. This forms a sealed rotor housing cavity 555, creating a sealed waterproof structure for the stator 55. This invention, by sealing the rotor housing cavity 555 to ensure internal waterproofing of the stator, also reduces the electromagnetic air gap between the stator and rotor, allowing the drive motor 5 and the electric pump 100 to have relatively small motor sizes.

[0032] The above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, such as combining different features in various embodiments, and these all fall within the protection scope of the present invention.

Claims

1. An electric motor, comprising a rotor and a stator arranged around the rotor, the stator comprising a stator core and a first wire frame and a second wire frame respectively disposed at two shaft ends of the stator core, the stator core having a plurality of stator teeth extending radially inward; characterized in that, The radial inner surfaces of the plurality of stator teeth together form an annular receiving hole; the first wire frame and the second wire frame respectively include a first cylindrical part and a second cylindrical part, the first cylindrical part and the second cylindrical part are respectively installed at both ends of the annular receiving hole, the inner wall of the first cylindrical part and the inner wall of the second cylindrical part and the receiving hole form a rotor receiving cavity; the inner wall of the rotor receiving cavity is provided with a waterproof layer; and the waterproof layer at least covers the inner wall of the annular receiving hole and the connection between the first cylindrical part and the second cylindrical part and the annular receiving hole.

2. The motor according to claim 1, characterized in that, The radial inner ends of two adjacent stator teeth are connected together at adjacent locations, making the wall of the annular receiving hole a closed annular surface; the waterproof layer covers at least the closed annular surface and the connection between the closed annular surface and the first cylindrical portion and the second cylindrical portion.

3. The motor according to claim 1, characterized in that, The inner surface of the first cylindrical portion and the inner surface of the second cylindrical portion are flush with the wall of the annular receiving hole.

4. The motor according to claim 1, characterized in that, The inner hole of the first cylindrical part is a through hole, and the first cylindrical part is sealed to the rotor support by a sealing ring at the end away from the stator core to form a sealed rotor receiving cavity.

5. The motor according to claim 1 or 4, characterized in that, The inner hole of the second cylindrical part is a blind hole, and it has an integrally formed cylindrical bottom, which serves as the bottom of the rotor receiving cavity.

6. The motor according to claim 1 or 4, characterized in that, The inner hole of the second cylindrical part is a blind hole, and it has a split cylindrical bottom. The cylindrical bottom is sealed to the end of the second cylindrical part away from the stator core, and serves as the bottom of the rotor receiving cavity; the cylindrical bottom is a heat conductor.

7. The motor according to claim 1, characterized in that, A groove is formed between adjacent stator teeth; the first wire frame and the second wire frame each include a plurality of first toothed shoes and a plurality of second toothed shoes, the radial inner ends of the plurality of first toothed shoes are connected to the first cylindrical portion, and the radial inner ends of the plurality of second toothed shoes are connected to the second cylindrical portion; the first toothed shoes and the second toothed shoes are respectively sleeved from the two axial ends of the stator onto the corresponding stator teeth to cover the axial surface of the stator teeth and the surface of the groove.

8. The motor according to claim 1, characterized in that, The stator core further includes an annular yoke, which is separately formed from the stator teeth. The annular yoke is sleeved on the outside of the plurality of stator teeth and connected to the radial outer ends of the plurality of stator teeth. One of the first wire frame and the second wire frame has a support portion for supporting an axial end face of the annular yoke.

9. The motor according to claim 1, characterized in that, The motor also includes a housing, which includes a cylindrical housing and a top cover. The top cover is installed at the open end of the housing, and the stator is installed on the inner wall of the housing. The top cover is sealed to the first wire frame. The top cover serves as a rotor support and has a support portion through which the rotor shaft of the rotor passes.

10. The motor according to claim 1, characterized in that, It also includes a printed circuit board; the printed circuit board is disposed on the outside of the bottom of the second cylindrical part, and the bottom of the cylinder is a heat conductor.

11. An electric pump for pumping fluid, the electric pump comprising a pump casing and an impeller disposed within the pump casing, characterized in that, The electric pump includes the motor as described in any one of claims 1-10, wherein the impeller is driven by the rotor shaft of the rotor.

12. The electric pump according to claim 11, wherein the pump casing forms a pump cavity above the upper cover of the motor housing, the impeller is housed in the pump cavity, the upper cover is provided with at least one through hole to connect the pump cavity and the rotor housing cavity, and a guide groove is provided axially inside the rotor shaft, the guide groove connecting the pump cavity and the rotor housing cavity.

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