Stator for an electric motor and electric compressor

Abstract

One embodiment of the present application provides a stator of an electric motor, comprising: a stator core having a plurality of teeth for winding a coil; an insulation assembly formed at one end of the stator core and comprising a guide portion having an outer surface on which the coil leading to one end of the stator core is arranged; and an insulation covering portion covering the insulation assembly; wherein the guide portion is provided with a plurality of grooves spaced apart in the circumferential direction, and an inner surface of the insulation covering portion is provided with a plurality of insulation protrusions corresponding to at least some of the grooves and protruding to the radially inner side.

Description

Technical Field

[0001] This invention relates to a stator of an electric motor and an electric compressor, and more specifically, to a stator of an electric motor and an electric compressor that, through insulating protrusions provided on the inner surface of an insulating cover, can ensure creepage distance between adjacent coils in a guide slot with a simple structure and can reduce material costs. Background Technology

[0002] Typically, cars are equipped with an air conditioning system for cooling and heating the interior. This air conditioning system includes a compressor that compresses the low-temperature, low-pressure gaseous refrigerant drawn from the evaporator into a high-temperature, high-pressure gaseous refrigerant, which is then sent to the condenser.

[0003] These types of compressors used in automobiles include mechanical compressors that are driven by engine power and electric compressors that utilize electric motors driven by electricity. In recent years, the use of electric compressors has been increasing with the accelerating electrification of automobiles.

[0004] Furthermore, in the field of electric compressors, the development of inverter-type compressors capable of changing the motor's operating speed is actively underway. An example of such an inverter-type existing electric compressor is disclosed in Korean Patent Publication No. 2022-0131164.

[0005] According to an example of a conventional electric compressor, the electric compressor 10 includes a housing 11, a compressor section 12, an electric motor 13, and an inverter section 14. The housing 11 is made of aluminum alloy and has a motor housing 15 that houses the compressor section 12 and the electric motor 13, and an inverter housing 18 that houses the inverter section 14. A three-phase terminal section 26 that supplies three-phase AC power from the inverter section 14 to the electric motor 13 passes through the inverter housing 18 and the motor housing 15 and is electrically connected to the circuit board 33.

[0006] In addition, Korean Patent Publication No. 2019-0121095 discloses in detail a conventional stator.

[0007] The existing stator includes a stator core and an insulator attached to the upper part of the stator core. The insulator includes: a main body formed in a ring shape; multiple teeth protruding towards the center of the main body and engaging with multiple teeth of the stator core; and multiple guide tabs protruding from the outer peripheral surface of the main body corresponding to the multiple teeth and for placing coils circumferentially along the outer peripheral surface. Multiple guide grooves for placing coils are formed on the multiple guide tabs.

[0008] At this point, grooves are formed between the multiple guide tabs to allow the coils to be led out to the outer circumference of the guide tabs. Because the coils are arranged adjacent to each other in these grooves, a short circuit may occur. Furthermore, if additional insulators are required for each groove to insulate the coils, material costs increase, and since rubber insulators require manual operation, automated processes cannot be implemented, leading to increased processing time and costs. Additionally, product quality may also decrease. Summary of the Invention

[0009] The purpose of this invention is to provide a stator for an electric motor and an electric compressor that, by means of insulating protrusions provided on the inner surface of the insulating cover, can ensure creepage distance between adjacent coils in the slot of the guide portion with a simple structure and can reduce material costs.

[0010] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems. Other technical problems not mentioned can be clearly understood by those skilled in the art based on the following description.

[0011] To address the aforementioned issues, one embodiment of the present invention provides a stator for an electric motor, comprising: a stator core having a plurality of teeth for winding a coil; an insulating assembly formed at one end of the stator core and including a guide portion, the outer surface of which is arranged with the coil extending to one end of the stator core; and an insulating cover portion covering the insulating assembly; the guide portion having a plurality of grooves spaced apart circumferentially, and the inner surface of the insulating cover portion having a plurality of insulating protrusions corresponding to at least a portion of the grooves and protruding radially inward.

[0012] According to an embodiment, the aforementioned insulating protrusion may form a first groove for placing the coil, which is led out to one end of the stator core.

[0013] According to an embodiment, the height of the first groove can be greater than the diameter of the coil.

[0014] According to an embodiment, the insulating protrusion may protrude radially inward more than the coil placed in the first groove.

[0015] According to an embodiment, the insulating cover and the insulating protrusion can be formed as one unit.

[0016] According to an embodiment, the outer surface of the guide portion may be formed with a second groove for placing the coil led out to one end of the stator core.

[0017] According to an embodiment, the insulating cover portion may be provided with a first positioning portion, and the insulating assembly may be provided with a second positioning portion that engages with the first positioning portion.

[0018] According to the embodiment, either the first positioning part or the second positioning part can be a positioning protrusion, and the other can be a positioning groove.

[0019] According to an embodiment, the above-mentioned insulating cover can be formed by combining multiple insulating components together.

[0020] According to an embodiment, the plurality of insulating members and the insulating protrusions formed on the insulating members may be formed of the same plastic resin material.

[0021] According to an embodiment, two or more of the above-mentioned insulating members may each be provided with at least one insulating protrusion.

[0022] According to an embodiment, the number of insulating protrusions disposed on any of the plurality of insulating members may be greater than the number of insulating protrusions disposed on another insulating member.

[0023] According to an embodiment, the insulating member with the most insulating protrusions among the plurality of insulating members may be provided with the first positioning part, and the insulating assembly may be provided with a second positioning part that engages with the first positioning part.

[0024] According to the embodiment, each of the above-mentioned plurality of insulating members may have a joint portion at both ends for joining with adjacent insulating members.

[0025] According to an embodiment, the aforementioned joint portion can be formed as a joint protrusion or a joint groove into which the joint protrusion can be inserted. The opposite ends of adjacent insulating members are respectively provided with the joint protrusion and the joint groove, thereby allowing the joint protrusion and the joint groove to engage with each other.

[0026] According to the embodiments, the above-mentioned plurality of insulating members may all be insulating members having the above-mentioned connecting protrusion formed at one end and the above-mentioned connecting groove formed at the other end.

[0027] According to the embodiment, some of the above-mentioned insulating members may be insulating members with the above-mentioned coupling grooves formed at one end and the other end, and the remaining insulating members may be insulating members with the above-mentioned coupling protrusions formed at one end and the other end.

[0028] According to the embodiments, some of the above-mentioned insulating members may be insulating members with the above-mentioned connecting protrusion formed at one end and the above-mentioned connecting groove formed at the other end, another part of the insulating members may be insulating members with the above-mentioned connecting groove formed at both one end and the other end, and the remaining insulating members may be insulating members with the above-mentioned connecting protrusion formed at both one end and the other end.

[0029] According to the embodiment, when assembling the above-mentioned plurality of insulating components, they can be assembled in the following order: an insulating component with the above-mentioned coupling groove formed at one end and the other end; an insulating component with the above-mentioned coupling protrusion formed at one end and the above-mentioned coupling groove formed at the other end; and an insulating component with the above-mentioned coupling protrusion formed at one end and the other end.

[0030] According to an embodiment, the aforementioned connecting protrusion disposed on one end of any insulating member may protrude in a direction perpendicular to the tangent at the middle position of the insulating member.

[0031] According to an embodiment, the above-mentioned plurality of insulating components may consist of four.

[0032] According to an embodiment, an impregnation process can be performed after the above-mentioned multiple insulating components are combined with each other.

[0033] According to an embodiment, the insulating protrusion may be formed of a rubber material, at least a portion of the insulating cover may be formed of a plastic material, and the insulating cover and the insulating protrusion may be formed by double injection molding.

[0034] According to an embodiment, a chamfered portion can be provided on the end face of the insulating protrusion facing the stator core, which is inclined toward the side away from the stator core.

[0035] To achieve the above-mentioned problem, another embodiment of the present invention provides an electric compressor, comprising: a housing; a compression section that compresses refrigerant flowing into the housing; an electric motor disposed within the housing to drive the compression section, and including a stator as described in any of the above embodiments, and a rotor that rotates by electromagnetic interaction with the stator; and an inverter section disposed on one side of the housing to control the electric motor; the insulating cover is disposed at one end of the stator core away from the inverter section, and a hub terminal block is disposed at the other end of the stator core near the inverter section, through which a connecting pin for electrically connecting the coil and the inverter section passes.

[0036] According to the present invention, since the insulating protrusion is integrally provided on the inner surface of the insulating cover, the creepage distance between adjacent coils in the slot of the guide portion can be ensured with a simple structure. Thus, since the insulating protrusion is provided on the inner surface of the existing insulating cover used to cover the insulating assembly to prevent foreign matter from entering, there is no need for additional components for connecting the insulating protrusion, thereby reducing material costs and eliminating manual operation, thus enabling automation and reducing process time and costs. Ultimately, the defect rate is reduced, and product quality is improved.

[0037] Furthermore, by dividing the insulating cover into multiple insulating components and assembling them radially inward to the insulating assembly, or even if the insulating protrusion is made of rubber material and the insulating cover is assembled axially to the insulating assembly, the insulating protrusion will pass through the coil while deforming, thus making the assembly of the insulating cover easy.

[0038] Furthermore, since the insulating protrusions extend radially inwards more than the coil placed in the first groove, the creepage distance between the coils can be adequately ensured.

[0039] The effects of the present invention are not limited to those described above, but should be understood to include all effects that can be derived from the composition of the invention as described in the detailed description or technical solution of the present invention. Attached Figure Description

[0040] Figure 1 This is a simplified cross-sectional view illustrating an embodiment of the electric compressor according to the present invention.

[0041] Figure 2 It is shown Figure 1 A 3D view of the stator of a Chinese electric motor.

[0042] Figure 3 From Figure 2 A perspective view showing the insulation cover after it has been separated.

[0043] Figure 4 From Figure 3 A perspective view showing the insulation covering omitted and viewed from another side.

[0044] Figure 5 yes Figure 2 A partial vertical sectional view.

[0045] Figure 6 yes Figure 2 A horizontal sectional view.

[0046] Figure 7 yes Figure 2 Bottom view of the middle insulating cover.

[0047] Figure 8 It is shown Figure 2 A perspective view of the first insulating member and the second insulating member of the middle insulating cover in a separated state.

[0048] Figure 9 This is a partial cross-sectional view showing another embodiment of the insulating protrusion.

[0049] Figure 10 This is a perspective view showing another embodiment of the insulating cover.

[0050] Figure 11 It is shown Figure 10A perspective view of the first to fourth insulating components of the middle insulating cover in a separated state.

[0051] Figure 12 yes Figure 10 A perspective view of the central insulating cover from below.

[0052] Figure 13 yes Figure 10 Bottom view of the middle insulating cover. Detailed Implementation

[0053] Hereinafter, preferred embodiments of the stator of the electric motor and the electric compressor of the present invention will be described with reference to the accompanying drawings.

[0054] Furthermore, the terms used below are defined in consideration of their function in this invention and may vary depending on the intent or practice of the user or operator. The following embodiments are not intended to limit the scope of the invention, but are merely exemplary matters of the constituent elements proposed in the technical solution.

[0055] To clearly illustrate the invention, irrelevant details have been omitted, and the same or similar reference numerals are used throughout the specification to refer to the same or similar constituent elements. Throughout the specification, when a part is referred to as "containing" a constituent element, unless specifically stated otherwise, it does not mean that other constituent elements are excluded, but rather that other constituent elements may be included.

[0056] Furthermore, throughout this specification, the constituent elements referred to as "~" can be composed of two or more constituent elements combined into one constituent element, or a constituent element can be further subdivided into two or more constituent elements according to function. In addition, each constituent element described below, in addition to its own main function, can also perform some or all of the functions of other constituent elements. Of course, some of the main functions of each constituent element can also be performed by other constituent elements.

[0057] First, refer to Figure 1 A brief description of an electric compressor 1 according to one embodiment of the present invention is provided. The electric compressor 1 may be a vehicle electric compressor used in the air conditioning system of an electric vehicle or a hybrid vehicle.

[0058] The electric compressor 1 of the present invention generally includes a housing 100, an electric motor 200, a compression section 300, and an inverter section 400.

[0059] The housing 100 forms the appearance of the electric compressor 1, and in this embodiment it is composed of a front housing (motor housing) 120 and a rear housing (compression housing) 140.

[0060] An electric motor 200 is disposed within the front housing 120 and provides power to the compression unit 300 for compressing the refrigerant. The electric motor 200 may include: a rotor 220 coupled to a rotating shaft 500 rotatably disposed at the center of the front housing 120; and a stator 1000 fixed to the front housing 120 and arranged radially outward of the rotor 220. The stator 1000 generates an electromagnetic field through a power supply applied from the inverter unit 400. Due to the electromagnetic interaction with the stator 1000, the rotor 220 rotates, thereby generating a rotational force for driving the compression unit 300.

[0061] The compression section 300 compresses the refrigerant flowing into the housing 100. In this embodiment, the compression section 300 is disposed within the rear housing 140 and may include: a rotary scroll 320 coupled to the rotating shaft 500 via an eccentric bushing; and a fixed scroll 340 forming a compression chamber for compressing the refrigerant together with the rotary scroll 320. Thus, the compression section 300 is connected to the electric motor 200 via the rotating shaft 500, thereby transmitting the rotational force generated by the electric motor 200 to the rotary scroll 320 of the compression section via the rotating shaft 500. However, the invention is not limited to this, and other compression sections may also be used.

[0062] The inverter section 400 is arranged on one side of the housing 100, and on the opposite side of the compressor section 300 with reference to the electric motor 200. The inverter section 400 is electrically connected to the electric motor 200, and applies power to the electric motor 200 and controls its operation by receiving power and control signals from the outside.

[0063] At this time, the electric motor 200 and the inverter section 400 can be electrically connected via connecting pins 600. In this embodiment, since a three-phase motor is used, three connecting pins 600, each connected to one of the three phases, can be provided to supply three-phase power from the inverter section 400 to the electric motor 200. The three connecting pins 600 are electrically connected to the three-phase coils 1300 of the stator 1000, and protrude through the front housing 120 to the inside of the inverter section 400. Each connecting pin 600 protruding to the inside of the inverter section 400 is electrically connected to the circuit board of the inverter section.

[0064] The following is for reference Figures 2 to 8 The stator 1000 of the electric motor 200 should be highlighted.

[0065] The stator 1000 generally includes a stator core 1200, a coil 1300, an insulation assembly 1500, an insulation cover 1700, and an insulation protrusion 1800.

[0066] The stator core 1200 includes a cylindrical body 1210 and a plurality of teeth 1220 protruding radially inward from the body 1210. In this embodiment, 12 teeth 1220 are shown, but the embodiment is not limited to this. Each tooth 1220 is wound with a coil 1300. For this purpose, predetermined spaces for winding the coil 1300 are formed between adjacent teeth 1220. For example, four teeth 1220 are wound with a coil 1300 corresponding to U in the three-phase power supply, another four teeth 1220 are wound with a coil 1300 corresponding to V in the three-phase power supply, and the remaining four teeth 1220 are wound with a coil 1300 corresponding to W in the three-phase power supply.

[0067] An insulating assembly 1500 is formed at one end of the stator core 1200 to insulate the stator core 1200 from the coil 1300. The coil 1300, which is led out to one end of the stator core 1200, is also connected within the insulating assembly 1500. Specifically, the insulating assembly 1500 described herein is arranged at the end of the stator core 1200 away from the inverter section 400. However, an additional insulating assembly for insulation may also be arranged at the other end of the stator core 1200 near the inverter section 400.

[0068] The insulating assembly 1500 includes: a plurality of insulating teeth 1510 that contact the upper surfaces of the plurality of teeth 1220 and are wound around the coil 1300; and a guide portion 1520. The insulating teeth 1510 are formed in the same number as the plurality of teeth 1220 and protrude radially inward from the guide portion 1520. Since the insulating teeth 1510 contact each of the teeth 1220, the coil 1300 is wound to wrap around both the insulating teeth 1510 and the teeth 1220.

[0069] The guide portion 1520 is formed in a cylindrical shape corresponding to the stator core 1200 and is located on the outer diameter side of the stator core 1200. A coil 1300 extending to one end of the stator core 1200 is arranged on the outer surface of the guide portion 1520. For this purpose, a second groove 1522 is formed on the outer surface of the guide portion 1520 for placing the coil 1300 extending to one end of the stator core 1200. Specifically, the coil 1300 wound around the teeth 1220 and the insulating teeth 1510 extends from one end of the stator core 1200 to the radially outer side of the guide portion 1520 and is placed in the second groove 1522. For this purpose, a plurality of slots 1524 for the coil 1300 to extend are provided in the guide portion 1520, and these slots are arranged circumferentially along the guide portion 1520. The position and height of the plurality of slots 1524 can be formed in various ways as needed. The second groove 1522 is provided in three intervals along the height direction of the guide portion 1520, for placing the three-phase coils 1300 respectively.

[0070] An insulating cover 1700 covers the insulating assembly 1500 to prevent foreign objects from entering from the outside. According to the invention, a plurality of insulating protrusions 1800 are provided on the inner surface of the insulating cover 1700. These insulating protrusions correspond to at least a portion of the plurality of grooves 1524 and protrude radially inward. Thus, as... Figure 2 As shown, when the insulating cover 1700 is attached to the insulating assembly 1500, at least a portion of the multiple slots 1524 are filled by the multiple insulating protrusions 1800.

[0071] A first groove 1820 is formed in the insulating protrusion 1800 for placing the coil 1300 led out to one end of the stator core 1200. That is, the coil 1300 is placed in the second groove 1522 when passing the outer peripheral surface of the guide portion 1520, and is placed in the first groove 1820 when passing the insulating protrusion 1800 arranged in the groove 1524 of the guide portion 1520.

[0072] In particular, the insulating protrusions 1800 are only arranged in the slots 1524 where the coil 1300 is led out to the outer peripheral surface of the guide portion 1520 and passes through the slots 1524 circumferentially. Thus, as Figure 4 As shown, even if coils 1300 of different phases pass side-by-side circumferentially within slot 1524, adjacent coils 1300 are insulated from each other by insulating protrusions 1800, thus preventing short circuits. That is, creepage distance between adjacent coils 1300 is ensured. Here, creepage distance is equivalent to the shortest distance measured along the surface of an insulator between two conductive parts; in this invention, it is equivalent to the shortest distance between adjacent coils 1300 along the surface of the insulating protrusions 1800.

[0073] On the other hand, insulating protrusions 1800 are not arranged in the groove 1524, which does not pass through the circumference of the guide portion 1520 in the coil 1300. Therefore, as... Figure 7 As shown, areas where the insulating protrusions 1800 are not formed will be generated in the insulating cover 1700. For example, more than 1 / 4 of the insulating cover 1700 may not have insulating protrusions 1800 formed.

[0074] Thus, the number and position of the insulating protrusions 1800 can vary depending on the lead-out position of the coil 1300, etc.

[0075] According to the present invention, since the insulating protrusion 1800 is integrally provided on the inner surface of the insulating cover 1700, the creepage distance between adjacent coils 1300 in the groove 1524 of the guide portion can be ensured with a simple structure.

[0076] In particular, such as Figure 5As shown, the insulating protrusion 1800 preferably protrudes radially inward more than the coil 1300 placed in the first groove 1820. This ensures sufficient creepage distance between the coils 1300.

[0077] Furthermore, in order for the coil 1300 to maintain its position without being pressed within the first groove 1820, the height h of the first groove 1820 is preferably slightly larger than the diameter of the coil 1300.

[0078] In this embodiment, the insulating cover 1700 and the insulating protrusion 1800 are integrally molded from the same plastic resin material. To facilitate assembly, the insulating cover 1700 is formed by combining multiple insulating members. The number of insulating members can be two, three, four, etc., but in this embodiment, the structure of the insulating cover 1700 formed by combining a first insulating member 1700a and a second insulating member 1700b will be described based on this.

[0079] The first insulating member 1700a and the second insulating member 1700b are respectively joined radially inward relative to the insulating assembly 1500, and the first insulating member 1700a and the second insulating member 1700b are joined together by elastic pressing, so that they will not separate radially. For this purpose, each of the first insulating member 1700a and the second insulating member 1700b has a joint portion at both ends for joining with the adjacent insulating member.

[0080] Specifically, the joint can be formed as a joint protrusion or a joint groove for inserting the joint protrusion. By providing joint protrusions and joint grooves at opposite ends of adjacent insulating members, the joint protrusions and joint grooves can be elastically joined. In this embodiment, a joint protrusion 1722 is provided at one end of the second insulating member 1700b opposite to the first insulating member 1700a, and a joint groove 1724 for inserting the joint protrusion 1722 is provided at one end of the first insulating member 1700a. Conversely, a joint groove 1724 is provided at the other end of the second insulating member 1700b opposite to the first insulating member 1700a, and a joint protrusion 1722 is provided at the other end of the first insulating member 1700a. That is, multiple insulating members 1700a and 1700b are insulating members with a joint protrusion 1722 formed at one end and a joint groove 1724 formed at the other end.

[0081] However, this is not the only possibility. Alternatively, both ends of the first insulating member 1700a and the second insulating member 1700b may be provided with a connecting protrusion or a connecting groove. That is, some of the insulating members 1700a and 1700b may be insulating members with connecting grooves 1724 formed at both ends, while the remaining insulating members may be insulating members with connecting protrusions 1722 formed at both ends.

[0082] In particular, the mating groove 1724 has a portion whose width increases with depth, and the mating protrusion 1722 has a shape corresponding to the mating groove 1724. In this embodiment, the mating protrusion 1722 and the mating groove 1724 have corresponding circular shapes. Therefore, after the mating protrusion 1722 is pressed into the mating groove 1724 by the elasticity of the plastic material, it will not detach radially. That is, the first insulating member 1700a and the second insulating member 1700b will not open up to each other.

[0083] Furthermore, the first insulating member 1700a and the second insulating member 1700b are each provided with at least one insulating protrusion 1800. As a result, the coil 1300 passes through both the first groove 1820 of the insulating protrusion 1800 of the first insulating member 1700a and the first groove 1820 of the insulating protrusion 1800 of the second insulating member 1700b, so the first insulating member 1700a and the second insulating member 1700b will not separate axially, and their positions are fixed.

[0084] In order to determine the position of the insulating cover 1700 relative to the insulating assembly 1500, the insulating cover 1700 may be provided with a first positioning part, and the insulating assembly 1500 may be provided with a second positioning part that engages with the first positioning part.

[0085] In this embodiment, the number of insulating protrusions 1800 provided on the first insulating member 1700a is greater than the number of insulating protrusions 1800 provided on the second insulating member 1700b. In this case, the first insulating member 1700a, which has more insulating protrusions 1800, is preferably joined to the insulating assembly 1500 before the second insulating member 1700b. This is because, with more insulating protrusions 1800, the first insulating member 1700a can be held more securely in position on the insulating assembly 1500 than the second insulating member 1700b. For this purpose, a first positioning portion is provided on the first insulating member 1700a, which has more insulating protrusions 1800, and a second positioning portion is provided on the insulating assembly 1500 at a position corresponding to the first positioning portion. In this embodiment, the first positioning portion corresponds to the positioning groove 1730, and the second positioning portion corresponds to the positioning protrusion 1530 inserted into the positioning groove 1730. However, it is not limited to this; the first positioning portion can also correspond to the positioning protrusion, and the second positioning portion can also correspond to the positioning groove.

[0086] Alternatively, according to the embodiment, the coupling protrusion 1722 and coupling groove 1724 may not be provided, and the first insulating member 1700a and the second insulating member 1700b may be fixed by adhesive.

[0087] Thus, by dividing the insulating cover 1700 into multiple insulating components and assembling them radially inward to the insulating assembly 1500, the assembly of the insulating cover becomes easy.

[0088] Furthermore, after the first insulating member 1700a and the second insulating member 1700b are bonded together, an impregnation treatment can be performed. Thereby, the epoxy resin penetrates and cures, thereby incidentally bonding the first insulating member 1700a and the second insulating member 1700b together.

[0089] An insulating cover 1700 is arranged in the electric compressor 1 at one end of the stator core 1200 away from the inverter section 400, while at the other end of the stator core 1200 near the inverter section 400, a cluster 1900 is arranged for a connecting pin 600 to pass through, wherein the connecting pin 600 is used to electrically connect the coil 1300 and the inverter section 400. The cluster 1900 forms an insulating structure between the connecting pin 600 and the coil 1300.

[0090] Next, refer to Figure 9 The insulating cover 1700 of another embodiment is described.

[0091] In this embodiment, the insulating cover 1700 is composed of a single component, but the insulating protrusion 1800 is formed of rubber material, and at least a portion of the insulating cover 1700 is formed of plastic material. The insulating cover 1700 and the insulating protrusion 1800 are formed by double injection molding.

[0092] Since the insulating cover 1700 is composed of a single component, it is assembled axially relative to the insulating assembly 1500. At this time, since the insulating protrusion 1800 is formed of rubber material, the insulating protrusion 1800 can pass through the coil 1300 while deforming.

[0093] At this time, in order to facilitate the deformation of the insulating protrusion 1800 and make the insulating cover 1700 easy to assemble, a chamfered portion 1840 can be provided on the end face of the insulating protrusion 1800 facing the stator core 1200, which is inclined to the side away from the stator core 1200.

[0094] Furthermore, if the side of the insulating cover 1700 with the insulating protrusion 1800 is formed of rubber material together with the insulating protrusion 1800, then when the insulating cover 1700 is assembled to the insulating assembly 1500 along the axial direction, the assembly can also be performed by expanding the side of the insulating cover 1700.

[0095] Next, refer to Figures 10 to 13 The insulating cover 2700 is described in another embodiment.

[0096] In this embodiment, the insulating cover 2700 is formed by combining multiple insulating components, specifically by combining a first insulating component 2700a, a second insulating component 2700b, a third insulating component 2700c, and a fourth insulating component 2700d.

[0097] Each of the first to fourth insulating members 2700a-2700d also has a joint portion at both ends for engaging with adjacent insulating members. In this embodiment, a portion of the plurality of insulating members 2700a-2700d is an insulating member with a joint protrusion 2722 formed at one end and a joint groove 2724 formed at the other end, another portion is an insulating member with a joint groove 2724 formed at both one end and the other end, and the remainder is an insulating member with a joint protrusion 2722 formed at both one end and the other end.

[0098] Specifically, both ends of the first insulating member 2700a are provided with engagement grooves 2724, and both ends of the fourth insulating member 2700d, which is opposite to the first insulating member 2700a, are provided with engagement protrusions 2722. Furthermore, the second insulating member 2700b has an engagement protrusion 2722 at one end opposite to the first insulating member 2700a, and an engagement groove 2724 at the other end opposite to the fourth insulating member 2700d. Similarly, the third insulating member 2700c has an engagement protrusion 2722 at one end opposite to the first insulating member 2700a, and an engagement groove 2724 at the other end opposite to the fourth insulating member 2700d.

[0099] Therefore, as Figure 11 As indicated by the middle arrow, the first insulating member 2700a and the fourth insulating member 2700d can be assembled in a straight line in the vertical direction, and the second insulating member 2700b and the third insulating member 2700c can be assembled in the horizontal direction. More specifically, it is preferable to first assemble the first insulating member 2700a into the insulating assembly, then assemble the second insulating member 2700b and the third insulating member 2700c from both sides of the first insulating member 2700a, and finally assemble the fourth insulating member 2700d. That is, the insulating member with a mating groove 2724 formed at one end and the insulating member with a mating protrusion 272 ...4 formed at one end and the insulating member with a mating protrusion 2722 formed at one end and the insulating member with a mating protrusion 2724 formed at one end and the insulating member with a mating protrusion 2724 formed at one end and the

[0100] At this time, as Figure 10 As shown, the connecting protrusion 2722, provided on one end of any insulating member, preferably protrudes in a direction perpendicular to the tangent at the midpoint of the insulating member. (Refer to...) Figure 10 It can be seen that the direction in which the connecting protrusion 2722 on one end of the second insulating member 2700b protrudes, i.e., the center line CL of the connecting protrusion 2722, is perpendicular to the tangent T at the middle position of the second insulating member 2700b. Similarly, the connecting protrusion 2722 on one end of the third insulating member 2700c also protrudes in a direction perpendicular to the tangent at the middle position of the third insulating member 2700c, and the connecting protrusions 2722 on both ends of the fourth insulating member 2700d also protrude in a direction perpendicular to the tangent at the middle position of the fourth insulating member 2700d. That is, the connecting protrusion 2722 on any insulating member is formed in a direction parallel to the assembly direction of that insulating member.

[0101] This is because, on an automated assembly line, multiple insulating components 2700a~2700d can be assembled while the stator core is fixed in the center, moving from the radially outer side to the inner side. At this time, the connecting protrusion 2722 and the connecting groove 2724 can be assembled together while the insulating components are moving.

[0102] Therefore, the insulating components are not assembled in an open state, but can be easily assembled in a straight line, and there is no concern about damage to the insulating components or reduction in durability.

[0103] Furthermore, two or more of the multiple insulating members are each provided with at least one insulating protrusion 2800. Therefore, the multiple insulating members will not detach axially, and their positions are fixed relative to each other. In this embodiment, as... Figure 13 As shown, the first to third insulating members 2700a~2700c are each provided with insulating protrusions 2800, while the fourth insulating member 2700d is not provided with insulating protrusions 2800. This allows for various changes in the number and position of the insulating protrusions 2800 depending on factors such as the coil lead-out position.

[0104] In this embodiment, the positioning groove 2730 is shown to be disposed on the fourth insulating member 2700d, which does not have the insulating protrusion 2800. Of course, depending on the situation, the positioning groove 2730 may also preferably be disposed on the first insulating member 2700a or the second insulating member 2700b, which has the most insulating protrusions 2800, among a plurality of insulating members.

[0105] Similarly, after the first to fourth insulating components 2700a to 2700d are joined together, they can be further fixed by impregnation treatment.

[0106] If the number of insulating components is too small, the components may over-open during assembly, potentially causing damage. If the number is too large, the assembly process becomes complex, and the insulating protrusions need to be formed close to the ends of the insulating components, which may make molding difficult. Therefore, in this invention, in addition to the insulating cover consisting of at least two insulating components, an insulating cover consisting of four insulating components is also formed to minimize the aforementioned problems. However, the number of insulating components can vary depending on the size of the stator, the slots, and the number and position of the insulating protrusions.

[0107] This invention is not limited to the specific embodiments and descriptions described above. Without departing from the spirit of the invention as claimed in the technical solution, those skilled in the art can make various modifications, and all such modifications fall within the protection scope of this invention.

[0108] This invention relates to stators of electric motors and electric compressors that, through insulating protrusions provided on the inner surface of the insulating cover, can ensure creepage distance between adjacent coils in the slots of the guide section with a simple structure and can reduce material costs.

Claims

1. A stator for an electric motor, in, include: The stator core has multiple teeth for winding the coil; An insulating assembly formed at one end of the stator core, including a guide portion on the outer surface of which the coil is arranged to extend to one end of the stator core; and An insulating cover portion that covers the insulating assembly; The guide section is provided with multiple grooves spaced apart circumferentially. The inner surface of the insulating cover is provided with a plurality of insulating protrusions that correspond to at least a portion of the plurality of grooves and protrude radially inward.

2. The stator of the electric motor according to claim 1, wherein, The insulating protrusion forms a first groove for placing the coil, which is led out to one end of the stator core.

3. The stator of the electric motor according to claim 2, wherein, The height of the first groove is greater than the diameter of the coil.

4. The stator of the electric motor according to claim 2, wherein, The insulating protrusion protrudes radially inward more than the coil placed in the first groove.

5. The stator of the electric motor according to claim 2, wherein, The insulating cover and the insulating protrusion are integrally formed.

6. The stator of the electric motor according to claim 2, wherein, The outer surface of the guide portion is formed with a second groove for placing the coil led out to one end of the stator core.

7. The stator of the electric motor according to claim 2, wherein, The insulating covering part is provided with a first positioning part. The insulating assembly is provided with a second positioning part that engages with the first positioning part.

8. The stator of the electric motor according to claim 7, wherein, Either the first positioning part or the second positioning part is a positioning protrusion, and the other is a positioning groove.

9. The stator of the electric motor according to claim 2, wherein, The insulating cover is composed of multiple insulating components joined together.

10. The stator of the electric motor according to claim 9, wherein, The plurality of insulating members and the insulating protrusions formed on the insulating members are formed of the same plastic resin material.

11. The stator of the electric motor according to claim 9, wherein, Two or more of the plurality of insulating components are each provided with at least one insulating protrusion.

12. The stator of the electric motor according to claim 11, wherein, The number of insulating protrusions provided on any one of the plurality of insulating members is greater than the number of insulating protrusions provided on the other insulating member.

13. The stator of the electric motor according to claim 12, wherein, The insulating member with the most insulating protrusions among the plurality of insulating members is provided with the first positioning part. The insulating assembly is provided with a second positioning part that engages with the first positioning part.

14. The stator of the electric motor according to claim 9, wherein, Each of the plurality of insulating components has a joint portion at both ends for connecting with adjacent insulating components.

15. The stator of the electric motor according to claim 14, wherein, The joint portion is formed as a joint protrusion or a joint groove into which the joint protrusion can be inserted. The opposing ends of adjacent insulating components are respectively provided with the connecting protrusion and the connecting groove, so that the connecting protrusion and the connecting groove are connected.

16. The stator of the electric motor according to claim 15, wherein, The plurality of insulating components are all insulating components having the connecting protrusion formed at one end and the connecting groove formed at the other end.

17. The stator of the electric motor according to claim 15, wherein, Some of the plurality of insulating members are insulating members with the connecting grooves formed at one end and the other end, while the remaining insulating members are insulating members with the connecting protrusions formed at one end and the other end.

18. The stator of the electric motor according to claim 15, wherein, A portion of the plurality of insulating members are insulating members with the connecting protrusion formed at one end and the connecting groove formed at the other end; another portion of the insulating members are insulating members with the connecting groove formed at both one end and the other end; and the remaining insulating members are insulating members with the connecting protrusion formed at both one end and the other end.

19. The stator of the electric motor according to claim 18, wherein, When assembling the plurality of insulating components, they are assembled in the following order: an insulating component with a mating groove formed at one end and the other end; an insulating component with a mating protrusion formed at one end and the mating groove formed at the other end; and an insulating component with a mating protrusion formed at one end and the other end.

20. The stator of the electric motor according to claim 15, wherein, The connecting protrusion, located at one end of any insulating member, protrudes in a direction perpendicular to the tangent at the midpoint of the insulating member.

21. The stator of the electric motor according to claim 20, wherein, The plurality of insulating components consists of four.

22. The stator of the electric motor according to claim 9, wherein, After the plurality of insulating components are joined together, an impregnation treatment is performed.

23. The stator of the electric motor according to claim 2, wherein, The insulating protrusion is formed of rubber material, and at least a portion of the insulating cover is formed of plastic material. The insulating cover and the insulating protrusion are formed by double injection molding.

24. The stator of the electric motor according to claim 23, wherein, On the end face of the insulating protrusion facing the stator core, a chamfered portion is provided, which is inclined toward the side away from the stator core.

25. An electric compressor, wherein, include: case; A compression section that compresses the refrigerant flowing into the housing; An electric motor, disposed within the housing to drive the compression section, and comprising a stator according to any one of claims 1 to 24, and a rotor that rotates by electromagnetic interaction with the stator; as well as An inverter section is arranged on one side of the housing to control the electric motor; The insulating cover is disposed at one end of the stator core away from the inverter section. A hub terminal block is arranged at the other end of the stator core near the inverter section, through which a connecting pin for electrically connecting the coil and the inverter section passes.

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