CN116569454A - motor - Google Patents

Abstract

A motor for a vehicle air conditioner is provided. The electric machine includes a first housing, a second housing, a sealing element and a plurality of tension loaded members. A first housing having a first mating surface is adapted to accommodate an electric motor and a second housing having a second mating surface is adapted to accommodate an inverter assembly. Furthermore, the first mating surface and the second mating surface are complementary and opposite each other. A sealing element is disposed between the first mating surface and the second mating surface, and the second housing is adapted to be coupled with the first housing. In addition, a plurality of tension-loaded members are provided in holes formed on the first mating surface and the second mating surface when coupling the first housing with the second housing.

Description

motor

technical field

The present invention relates generally to an electric machine, and more particularly, to a connection between a motor case and an inverter case of the electric machine to reduce leakage of electromagnetic noise from the case of the electric machine.

Background technique

Typically, an electric motor, especially an electric compressor, is provided in the alternating current (AC) circuit of the vehicle. The electric compressor includes a compression unit for compressing refrigerant, an electric motor driving the compression unit, and an inverter assembly driving the electric motor in a controlled manner. Additionally, a housing is provided to enclose the various components of the electric compressor and are mechanically connected together by various fasteners. In one example, the motor housing is configured to enclose the electric motor, and the inverter housing is configured to enclose the inverter assembly. The electric motor provided in the compressor enables the compression unit to suck refrigerant from an inlet formed on the motor housing to cool the electric motor by circulating the refrigerant through the motor housing. Generally, the motor case is formed of an aluminum material and has a cylindrical shape with openings on both sides. In addition, refrigerant enters the compression unit to be compressed, and flows out from the electric compressor through a discharge port formed on a rear cover connected to one end of the motor case. From the other end of the motor housing, the electric motor is plugged in and connected to the inverter housing. Traditionally, the mating portion of each shell is sealed with a gasket to prevent refrigerant leakage. Generally, the gasket provided between the motor case and the inverter case has three layers, such as a substrate made of metal material as the first layer, and rubber coated on both sides of the substrate to form the second and third layers. layer. The inverter housing also includes high voltage (HV) connector terminals and low voltage (LV) connector terminals. Electromagnetic noise is traditionally generated by the active components of electric motors in the motor housing. Since the gasket is a rubber-coated metal gasket, there is a possibility that electromagnetic noise is transmitted from the motor case to the inverter case. Additionally, electromagnetic noise transferred from the motor housing may interfere with the HV and LV connector terminals. This electromagnetic noise interference on the connector terminals can enter the inverter case and cause the control circuitry housed in the inverter case to malfunction.

Therefore, there remains a need for an electric motor provided with features that avoid leakage of electromagnetic noise from the motor's housing. Furthermore, there remains another need for the connection formed between the motor case and the inverter case of the electric machine to reduce the leakage path of electromagnetic noise by grounding the electromagnetic noise. Furthermore, there remains a need for an electric machine provided with features to protect the inverter circuit from electromagnetic noise.

Contents of the invention

In this specification, some elements or parameters may be referred to, such as a first element and a second element. In this case, unless otherwise stated, such references are used only to distinguish and name similar but not identical elements. No concept of priority should be inferred from this reference, as these terms may be interchanged without departing from the invention. Furthermore, such indexing does not imply any order of installation or use of the elements of the invention.

In view of the foregoing, embodiments of the present invention provide an electric motor, especially an electric compressor for vehicle air conditioning. The electric machine includes a first housing, a second housing, a sealing element and a plurality of tension loaded members. A first housing having a first mating surface is adapted to accommodate an electric motor and a second housing having a second mating surface is adapted to accommodate an inverter assembly. Furthermore, the first mating surface and the second mating surface are complementary and opposite each other. A sealing element is disposed between the first mating surface and the second mating surface, and the second housing is adapted to be coupled with the first housing. Furthermore, the plurality of tension-loaded members are disposed in holes formed on the first mating surface and the second mating surface when coupling the first housing with the second housing.

In addition, a sealing element having an aperture is aligned with an aperture formed in the first mating surface and the second mating surface to receive the tension loaded member therethrough.

In one example, the second housing includes an extension portion extending radially outward relative to the second housing, and first and second connectors disposed on side walls of the extension portion of the second housing at least one of the .

In one example, the plurality of tension loaded members are disposed on a circumferential region of the second mating surface corresponding to at least one of the first and second connectors.

The motor further includes a plurality of bosses formed on one side of outer peripheries of the first and second fitting surfaces corresponding to at least one of the first and second connectors, wherein holes are formed on the bosses.

In one embodiment, holes are formed on the first mating surface and the second mating surface at a predetermined distance.

In one example, at least one distance between adjacent holes formed on the first mating surface and the second mating surface is less than 30 mm.

Furthermore, the sealing element is a metal gasket coated with rubber.

Additionally, the plurality of tension-loaded members are spring pins.

In another example, the motor further includes at least two pins formed on the second housing to position the first housing in alignment with the second housing.

Description of drawings

Other characteristics, details and advantages of the invention can be inferred from the description of the invention below. A more complete appreciation of the present invention and its many attendant advantages will be readily obtained, and become more comprehensible, by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:

Figure 1 shows a block diagram of a motor according to an embodiment of the invention;

Fig. 2 shows the schematic diagram of the first housing of the motor in Fig. 1;

Figure 3 shows a cross-sectional view of the motor taken along the longitudinal axis of the motor in Figure 1;

Fig. 4 shows the schematic view of the second casing of the motor in Fig. 1 in a plane perpendicular to the longitudinal axis of the second casing;

Figure 5 shows an exploded view of the second housing of the motor of Figure 1 with the inverter assembly;

Figure 6 shows an exploded view of the motor in Figure 1; and

7 illustrates an enlarged cross-sectional view of one tensioned member of the plurality of tensioned members coupled between the first housing and the second housing of FIG. 1 .

Detailed ways

It has to be noted that the accompanying drawings disclose the invention in sufficient detail to be practical and, if necessary, help to better define the invention. However, the present invention should not be limited to the embodiments disclosed in the specification.

The invention relates to a motor, in particular to an electric compressor arranged in a vehicle air-conditioning circuit. Generally, an electric compressor includes a motor housing provided with an electric motor and an inverter housing provided with an inverter assembly. The motor case and the inverter case are coupled together to realize the connection between the electric motor and the inverter. In addition, the electric motor is connected with the compression unit to compress the refrigerant flowing therein. In order to achieve a fluid-tight connection between the motor housing and the inverter housing, a rubber-coated metal gasket is arranged between the motor housing and the inverter housing. This rubber coating on the gasket allows the transmission of electromagnetic noise generated by the electric motor arranged in the motor housing. Therefore, such gaskets transmit electromagnetic noise to the inverter components and cause the inverter components to malfunction. To avoid this, a physical connection between the inverter housing and the motor housing is established. This physical connection interacts with the motor's outer body, which is connected to the vehicle's ground. Therefore, electromagnetic noise is limited from entering the inverter housing. Furthermore, the location and function of this physical connection will be explained with reference to the following figures.

FIG. 1 shows a block diagram of an electric machine 100 according to an embodiment of the present invention. In this embodiment, the motor 100 is an electric compressor, especially an electric compressor 100 integrated with an inverter and driven by a motor. The motor 100 is provided in a refrigerant circuit of a vehicle. Generally, the motor 100 is provided in a refrigerant circuit of a vehicle to compress refrigerant flowing therein. The electric machine 100 includes a first housing 110 adapted to accommodate an electric motor 112 , a second housing 120 adapted to accommodate an inverter assembly 122 , and a third housing 130 adapted to accommodate a compression unit 132 . In addition, the first case 110 , the second case 120 and the third case 130 are integrally fastened by fastening means (not shown) such as bolts, thereby forming a housing of the motor 100 . In one embodiment, the first housing 110, the second housing 120 and the third housing 130 are formed of metal, in particular aluminum die-casting.

The electric motor 112 provided in the first housing 110 includes a stator and a rotor (not shown in FIG. 1 ). In addition, the rotation shaft 134 is connected to the rotor, and the rotation shaft 134 extends into the third housing 130 to be coupled with the compression unit 132 . The first housing 110 as a motor housing is formed in a cylindrical shape with openings on both sides to house the electric motor 112 . In addition, one end of the first case 110 is coupled to a third case 130 having a compression unit 132 . From the other end of the first housing 110 , an electric motor 112 is inserted and connected with a second housing 120 having an inverter assembly 122 . When the electric motor 112 is energized, the rotary shaft 134 drives the compression unit 132 disposed in the third housing 130 .

The compression unit 132 disposed in the third housing 130 includes a fixed scroll and an orbiting scroll for compressing refrigerant flowing therein. In one embodiment, the fixed scroll is fixedly integrally formed with the third housing 130 . The orbiting scroll is rotatably connected with an eccentric pin formed by a rotating shaft 134 extending from the first housing 110 . The orbiting scroll is adapted to compress refrigerant in a compression space defined between the fixed scroll and the orbiting scroll when the rotary shaft 134 is rotated by the electric motor 112 . In other words, the refrigerant in the compression space is compressed by the orbiting motion of the orbiting scroll relative to the fixed scroll. In addition, the suction port 136 is integrally formed with the first housing 110 for sucking refrigerant into the motor 100 . The refrigerant sucked from the suction port 136 at the first housing 110 may flow through the electric motor 112 to cool or absorb heat generated by the electric motor 112 , and enter the third housing 130 to perform a compression process. Thereafter, the compressed refrigerant is discharged from the motor 100 through the discharge port 150 integrally formed with the third case 130 .

An inverter assembly 122 accommodated in a second housing 120 serving as an inverter housing is adapted to drive the electric motor 112 in a controlled manner. The inverter assembly 122 includes a number of electronic components mounted on a circuit board to perform required operations. The board is powered by an external power source, such as the vehicle's battery. The circuit board is shown in Figure 5. In addition, a sealed terminal 142 is provided on the end wall of the second housing 120 and is adapted to be coupled with the electric motor 112 . Inverter assembly 122 generates controlled inputs for electric motor 112 and transmits these inputs to electric motor 112 through sealed terminals 142 . Additionally, an input generated by inverter assembly 122 may control the speed of electric motor 112 .

FIG. 2 shows a schematic diagram of the first housing 110 of the motor 100 in FIG. 1 . Electric motor 112 is not shown in FIG. 2 . In one embodiment, the first housing 110 includes an annular wall 208 that extends a distance to form the first housing 110 into a cylindrical shape. Furthermore, the first housing 110 includes a first mating surface 202 defined in direction A on a longitudinal end of the first housing 110 . In one example, the first housing 110 has a hollow cylindrical shape, and an opening in the direction A is defined on an inner peripheral surface of the first housing 110 . In addition, the first case 110 has openings on both sides to be coupled with the second case 120 and the third case 130, respectively. In one example, an opening formed on the first case 110 along a direction A is adapted to be aligned with the second case 120 , and an opening formed on the first case 110 along a direction B is aligned with the third case 130 . Furthermore, the third housing 130 is mechanically coupled to the first housing 110 at the opening defined in the direction B by any connection means. The connecting means may be threads and bolts. In one embodiment, the electric motor 112 is inserted into the first housing 110 through an opening defined in the first housing 110 along direction A. As shown in FIG.

Furthermore, the suction port 136 protrudes from the annular wall 208 of the first housing 110 as shown in FIG. 2 . In one embodiment, the first housing 110 may further include a mounting device on its outer surface to allow the motor 100 to be mounted to the vehicle body.

In addition, at least two positioning holes 210A, 210B are provided on the outer and/or inner circumference of the first mating surface 202 at a predetermined distance to receive any connection means, such as positioning pins, so that the first housing 110 and the second Efficient positioning between housings 120 is achieved. In particular, on the outer periphery of the first mating surface 202 , positioning holes 210A, 210B are provided on opposite sides with respect to the central axis of the first housing 110 .

The first housing 110 also includes a plurality of holes 204A-D formed on the first mating surface 202 at predetermined distances. In one embodiment, the plurality of holes 204A-D are formed on an outer perimeter of the first mating surface 202 . According to the foregoing embodiments, as shown in FIG. 2 , a plurality of bosses 206A-D are provided on the peripheral surface of the opening. In other words, the plurality of bosses 206A-D are formed on the outer surface of the first housing 110 at the periphery of the opening defined in the first housing 110 . Additionally, the plurality of holes 204A-D are formed on the plurality of bosses 206A-D.

FIG. 3 shows a sectional view of the electric machine 100 in FIG. 1 in a plane perpendicular to the longitudinal axis of the electric machine 100 . The second case 120 has a base plate 302 and a peripheral wall 306 extending from an outer edge of the base plate 302 to define a space for accommodating the inverter assembly 122 . In one embodiment, the substrate 302 is convex-convex in shape to correspond to the electronic components 320 of the inverter assembly 122 .

Furthermore, as shown in FIG. 3 , the second housing 120 includes an extension portion 316 that extends outward beyond the outer diameter of the first housing 110 in the radial direction. In one embodiment, the base plate 302 of the second housing 120 includes a bottom 308A complementary to the opening provided in the first housing 110 and an upper portion 308B forming the sidewall 304 of the extension 316 . Furthermore, the bottom 308A of the second housing 120 is annular and adapted to be coupled with the first housing 110 .

In one embodiment, as shown in FIGS. 1 and 4 , the sealing terminal 142 is disposed on the bottom 308A of the substrate 302 of the second housing 120 . The inverter assembly 122 and the electric motor 112 are electrically connected via the sealed terminal 142 . The bottom 308A of the second housing 120 includes a second mating surface 310 that is complementary to and opposite the first mating surface 202 of the first housing 110 .

Additionally, the second mating surface 310 includes a plurality of apertures 312A-D disposed on the second mating surface 310 . In one embodiment, the plurality of holes 312A-D formed on the second mating surface 310 are complementary to the plurality of holes 204A-D formed on the first mating surface 202 . Additionally, a plurality of bosses 314A-D are disposed on the second mating surface 310 . In one embodiment, the plurality of bosses 314A-D are disposed on an outer periphery of the second mating surface 310 .

As shown in FIGS. 3 and 4 , the second housing 120 is also provided with at least two connectors 318A-B on the side wall 304 of the extension portion 316 . The two connectors 318A-B include at least a first connector 318A and a second connector 318B for providing power and signals to the inverter assembly 122 . In one embodiment, the first connector 318A is a high voltage terminal and the second connector 318B is a low voltage terminal.

As shown in FIGS. 3 and 5 , the inverter assembly 122 also includes the plurality of electronic components 320 mounted on the circuit board 138 for controlling operation. As shown in FIG. 5 , the circuit board 138 is located in the inverter assembly accommodation space and is secured to the base plate 302 by a plurality of bolts/screws 228 . The first connector 318A and the second connector 318B are electrically connected to the electronic components 320 provided on the circuit board 138 of the inverter assembly 122 via bus bars and/or wires. In one example, high voltage terminal 318A provides a high voltage to an inverter designed by electronic component 320 . This inverter converts high-voltage DC power into three-phase AC power, and delivers this power to the electric motor 112 provided in the first housing 110 . In addition, the low-voltage terminal 318B provides low-voltage DC power to a control unit designed by the electronic component 320 to control the electric motor 112 , such as the speed of the electric motor 112 , the number of rotor revolutions, turning on and off, and the like.

In a preferred embodiment, the plurality of bosses 206A-D, 314A-D are formed on one side of the outer circumference of the first mating surface 202 of the first housing 110 and the second mating surface 310 of the second housing 120, Corresponds to connectors 318A-B. In one example, the bosses 206A-D formed on the first mating surface 202 are complementary to the bosses 314A-D formed on the second mating surface 310 .

FIG. 6 shows an exploded view of the electric machine 100 of FIG. 1 depicting the connection between the first housing 110 and the second housing 120 . As described above, the first mating surface 202 of the first housing 110 is complementary to and adapted to couple with the second mating surface 310 of the second housing 120 . Furthermore, a sealing element 402 is provided between the first mating surface 202 and the second mating surface 310 to configure a fluid-tight connection between the first housing 110 and the second housing 120 . In one embodiment, the sealing element 402 is a gasket configured with three layers, for example a first layer made of metallic material, and second and third layers formed of rubber coated on both sides of the first layer. When the first housing 110 is coupled with the second housing 120 , the sealing element 402 is in contact with the first mating surface 202 and the second mating surface 310 .

Sealing element 402 also includes apertures 404A-D formed in an outer periphery of sealing element 402 . In one embodiment, the apertures 404A-D align with the holes 204A-D, 312A-D formed on the first mating surface 202 of the first housing 110 and the second mating surface 310 of the second housing 120 .

The electric machine 100 also includes a plurality of tension-loaded members 406A-D disposed on the first mating surface when the first housing 110 is coupled to the second housing 120. The holes 204A-D, 312A-D on the surface 202 and the second mating surface 310. In one example, the plurality of tension loaded members 406A-D are spring pins. Additionally, the plurality of tension loaded members 406A-D are made of a metallic material.

In one embodiment, the plurality of tension loaded members 406A-D are disposed at a circumferential region of the second mating surface 310 corresponding to at least one of the first connector 318A and the second connector 318B. As shown in FIGS. 4 and 6 , the holes 312A-D and the tension-loaded members 406A-D inserted into the holes 312A-D are disposed between the connectors 318A-B and the inner side of the second mating surface 310 that generates electromagnetic noise. at the area.

In another embodiment, when the plurality of tension loaded members 406A-D are inserted into the holes 204A-D, 312A-D formed in the first mating surface 202 and the second mating surface 310, the plurality of The tension loaded members 406A-D are adapted to elastically deform along their radial direction. In one example, the outer diameter of the plurality of tension loaded members 406A-D is equal to or greater than the inner diameter of the holes 204A-D, 312A-D. Since the holes 204A-D, 312A-D have the same diameter as the plurality of tension-loaded members 406A-D, the plurality of tension-loaded members 406A-D need to The members 406A-D are elastically deformable in the radial direction so that the plurality of tension loaded members 406A-D can be easily inserted into the holes 204A-D, 312A-D. In this example, one end of the plurality of tension loaded members 406A-D is inserted into holes 312A-D formed in the second mating surface 310 . Thereafter, the sealing member 402 is disposed on the second mating surface 310 of the second housing 120 such that the plurality of tension-loaded members 406A-D disposed in the holes 312A-D of the second mating surface 310 pass through. Apertures 404A-D are formed in sealing member 402 . In addition, when the first housing 110 is coupled to the second housing 120, the other ends of the plurality of tension-loaded members 406A-D are inserted into the holes 204A-D formed on the first mating surface 202, thereby forming Housing for the motor 100. Since the plurality of tension-loaded members 406A-D are disposed between the first housing 110 and the second housing 120, the plurality of tension-loaded members 406A-D realize the connection between the first housing 110 and the second housing 110. Physical contact between housings 120 . In addition, the main body of the second case 120 is connected to a ground terminal of the vehicle. As the plurality of tension-loaded members 406A-D achieve physical contact between the first housing 110 and the second housing 120, electromagnetic noise generated by the electric motor 112 of the first housing 110 passes through the second housing. Body 120 is grounded.

The plurality of tension loaded members 406A-D disposed between the first housing 110 and the second housing 120 at regions corresponding to the connectors 318A-B may prevent electromagnetic noise from being transmitted to the connectors 318A-B, thereby preventing electromagnetic noise from interfering with the electronic components 320 disposed in the inverter assembly 122 .

FIG. 7 shows an enlarged cross-sectional view of one tension-loaded member of the plurality of tension-loaded members 406A-D secured between the first housing 110 and the second housing 120 . In addition, the plurality of tension loaded members 406A-D are made of a metallic material having high electrical conductivity and EMC/EMI shielding properties, such as copper, iron, steel, aluminum, and the like. In one embodiment, each tension loaded member 406A-D includes a cylindrically extending pin with a slit formed in the longitudinal direction of the pin. In addition, both ends of the pin body are provided with inclined surfaces so that when the first housing 110 is assembled with the second housing 120, the tension-loaded members 406A-D can be easily inserted into the holes 204A-D, 312A-D. middle. In one embodiment, one of the distances between adjacent tensioned members 406A-D of the plurality of tensioned members 406A-D is less than 30 mm. In another embodiment, at least two solid metal pins 408 are inserted into positioning holes 410A and 410B formed on the second housing 120 to position the first housing 110 in alignment with the second housing 120, as shown in FIG. 6. In addition, the positioning holes 410A-B formed on the second housing 120 are complementary to the positioning holes 210A-B formed on the first housing 110 .

As noted above, the plurality of tension loaded members 406A-D has an outer diameter equal to or greater than the inner diameter of the holes 204A-D, 312A-D. Accordingly, the coefficient of friction between the outer bodies of the plurality of tension-loaded members 406A-D and the inner walls of the bores 204A-D, 312A-D may be high, thereby pulling the plurality of tension-loaded members 406A- D remains within holes 204A-D, 312A-D. To insert the plurality of tension-loaded members 406A-D into the holes 204A-D, 312A-D, the plurality of tension-loaded members 406A-D are deformed in their radial direction such that the plurality of tension-loaded members Both ends of the tension members 406A-D may be inserted into corresponding holes 204A-D, 312A-D provided in the first housing 110 and the second housing 120 . In one embodiment, each tensioned member 406A-D has a length of 14 mm. In one example, the plurality of tension-loaded members 406A-D are inserted into the holes 204A-D in the first housing 110 at a larger portion of the pin body than the plurality of tension-loaded members 406A-D are inserted into the holes 204A-D. The pin portion in the holes 312A-D in the second housing 120 .

All the above-mentioned embodiments are only for explaining the present invention, and there may be more embodiments and combinations thereof. Therefore, the present invention should not be limited to the above-described embodiments.

Claims (10)

1. An electric machine (100), comprising:

a first housing (110) having a first mating surface (202) and adapted to house an electric motor (112);

a second housing (120) having a second mating surface (310) and adapted to house an inverter assembly (122), wherein the first mating surface (202) and the second mating surface (310) are complementary and opposite each other;

-a sealing element (402) arranged between the first mating surface (202) and the second mating surface (310), wherein the second housing (120) is adapted to be coupled with the first housing (110); and

a plurality of tension-loaded members (406A-D) disposed in apertures (204A-D, 312A-D) formed in the first and second mating surfaces (202, 310) simultaneously couple the first housing (110) with the second housing (120).

2. The electric machine (100) of claim 1, wherein the sealing element (402) has apertures (404A-D) aligned with apertures (204A-D, 312A-D) formed on the first and second mating surfaces (202, 310) to receive the tension-loaded members (406A-D) therethrough.

3. The electric machine (100) of claim 1 or 2, wherein the second housing (120) comprises an extension (316) extending outwardly in a radial direction relative to the second housing (120) and at least one of a first and a second connector (318A, 318B) respectively provided on a side wall (304) of the extension (316) of the second housing (120).

4. The electric machine (100) of claim 3, wherein the plurality of tension-loaded members (406A-D) are disposed at a circumferential region of the second mating surface (310) corresponding to at least one of the first and second connectors (318A, 318B).

5. The electric machine (100) of claim 3, further comprising a plurality of bosses (206A-D, 314A-D) formed on one side of the outer perimeter of the first and second mating surfaces (202, 310), corresponding to the at least one of the first and second connectors (318A, 318B), wherein apertures (204A-D, 312A-D) are formed on the bosses (206A-D, 314A-D).

6. The electric machine (100) of any of claims 1 to 5, wherein the apertures (204A-D, 312A-D) are formed on the first mating surface (202) and the second mating surface (310) at a predetermined distance.

7. The electric machine (100) of any of claims 1 to 6, wherein at least one distance between adjacent holes (204A-D, 312A-D) formed on the first mating surface (202) and the second mating surface (310) is less than 30mm.

8. The electric machine (100) of any of claims 1 to 7, wherein the sealing element (402) is a rubber coated metal gasket.

9. The electric machine (100) of any of claims 1 to 8, wherein the plurality of tension-loaded members (406A-D) are spring pins.

10. The electric machine (100) of any of claims 1 to 9, further comprising at least two pins (408) formed on the second housing (120) to position the first housing (110) in alignment with the second housing (120).