Stator of electric motor and electric compressor

Abstract

An embodiment of the present invention provides a stator of an electric motor, the stator comprising: a stator core having a plurality of teeth around which a coil is wound; an insulation assembly formed at one end part of the stator core and including a guide part, the outer surface of which the coil drawn out to the one end part of the stator core is disposed on; and an insulation cover part for covering the insulation assembly, wherein a plurality of slots spaced apart along the circumferential direction is provided at the guide part, and a plurality of insulating protrusions protruding radially inward to correspond to at least some of the plurality of slots is provided at the inner surface of the insulation cover part.

Description

Stator of electric motor and electric compressor

[0001] The present invention relates to a stator of an electric motor and an electric compressor, and more particularly, to a stator of an electric motor and an electric compressor, which can secure a creepage distance between adjacent coils in a slot of a guide part with a simple structure by means of an insulating protrusion provided on the inner surface of an insulating cover part, and which can reduce material costs.

[0002] Automobiles are typically equipped with an air conditioning system to cool and heat the interior. This system includes a compressor that compresses low-temperature, low-pressure gaseous refrigerant drawn from the evaporator into high-temperature, high-pressure gaseous refrigerant and sends it to the condenser.

[0003] Compressors applied to these automobiles include mechanical compressors that are driven by the driving force of the engine and electric compressors that use electric motors driven by electricity. Recently, as electrification in automobiles accelerates, the use of electric compressors is increasing.

[0004] Additionally, development of inverter-type compressors capable of variable motor speeds is actively underway in electric compressors. An example of a conventional inverter-type electric compressor is disclosed in Republic of Korea Patent Publication No. 2022-0131164.

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

[0006] Additionally, a conventional stator is disclosed in detail in Korean Patent Publication No. 2019-0121095.

[0007] A conventional stator includes a stator core and an insulator coupled to an upper portion of the stator core. The insulator includes a main body formed in a ring shape, a plurality of teeth that protrude toward the center of the main body and engage with each of a plurality of teeth of the stator core, and a plurality of guide tabs that protrude on an outer surface of the main body to correspond to the plurality of teeth and on which a coil is mounted in a circumferential direction along the outer surface. Each of the plurality of guide tabs has a plurality of guide grooves formed separately, on which a coil is mounted.

[0008] At this time, slots are formed between the multiple guide tabs so that the coils can be extended to the outer surface of the guide tabs. These slots pose a risk of short circuits because the coils are positioned adjacent to each other. Furthermore, if separate insulators must be assembled for insulation between the coils in each slot, material costs increase. Furthermore, since the rubber insulators require manual assembly, automation is impossible, increasing process time and costs. Furthermore, product quality may deteriorate.

[0009] The purpose of the present invention is to provide a stator of an electric motor and an electric compressor, which can secure a creepage distance between adjacent coils in a slot of a guide part with a simple structure by means of an insulating protrusion provided on the inner surface of an insulating cover part, and which can reduce material costs.

[0010] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0011] In order to solve the above problem, one embodiment of the present invention provides a stator of an electric motor, including: a stator core having a plurality of teeth on which a coil is wound; an insulating assembly formed at one end of the stator core and including a guide portion on an outer surface of which the coil extended to the one end of the stator core is arranged; and an insulating cover portion covering the insulating assembly; wherein the guide portion is provided with a plurality of slots spaced apart along a circumferential direction, and an inner surface of the insulating cover portion is provided with a plurality of insulating protrusions protruding radially inwardly corresponding to at least some of the plurality of slots.

[0012] According to an embodiment, the insulating projection may be formed with a first groove in which the coil drawn out to one end of the stator core is seated.

[0013] In some embodiments, the height of the first groove may be greater than the diameter of the coil.

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

[0015] According to an embodiment, the insulating cover part and the insulating protrusion may be formed integrally.

[0016] According to an embodiment, a second groove may be formed on the outer surface of the guide portion, into which the coil drawn out to one end of the stator core is seated.

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

[0018] According to an embodiment, one of the first positioning unit and the second positioning unit may be a positioning projection, and the other may be a positioning groove.

[0019] According to an embodiment, the insulating cover part may be formed by combining a plurality of insulating members.

[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, at least two of the plurality of insulating members may each be provided with at least one insulating protrusion.

[0022] According to an embodiment, the number of insulating protrusions provided on one of the plurality of insulating members may be greater than the number of insulating protrusions provided on the other.

[0023] According to an embodiment, among the plurality of insulating members, the insulating member having the largest number of insulating protrusions 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.

[0024] According to an embodiment, each end of the plurality of insulating members may be provided with a joining portion for joining with an adjacent insulating member.

[0025] According to an embodiment, the connecting portion is formed as a connecting projection or a connecting groove into which the connecting projection can be inserted, and the connecting projection and the connecting groove are respectively provided at opposite ends of adjacent insulating members so that the connecting projection and the connecting groove can be connected.

[0026] According to an embodiment, the plurality of insulating members may all be insulating members having the joining projection formed at one end and the joining groove formed at the other end.

[0027] According to an embodiment, some of the plurality of insulating members may be insulating members having the joining grooves formed at both one end and the other end, and the rest may be insulating members having the joining protrusions formed at both one end and the other end.

[0028] According to an embodiment, some of the plurality of insulating members may be insulating members having the joining protrusion formed at one end and the joining groove formed at the other end, other parts may be insulating members having the joining groove formed at both one end and the other end, and the remainder may be insulating members having the joining protrusion formed at both one end and the other end.

[0029] According to an embodiment, when assembling the plurality of insulating members, the insulating members may be assembled in the following order: an insulating member having the joining groove formed at both one end and the other end, an insulating member having the joining protrusion formed at one end and the joining groove formed at the other end, and an insulating member having the joining protrusion formed at both one end and the other end.

[0030] According to an embodiment, the coupling protrusion provided at one end of one insulating member may protrude along a direction perpendicular to a tangent line at a middle position of one of the insulating members.

[0031] According to an embodiment, the plurality of insulating members may be composed of four.

[0032] According to an embodiment, impregnation may be performed after the plurality of insulating members are bonded to each other.

[0033] According to an embodiment, the insulating protrusion is formed of a rubber material, at least a part of the insulating cover part is formed of a plastic material, and the insulating cover part and the insulating protrusion can be double-injected.

[0034] According to an embodiment, the end face of the insulating projection facing the stator core may be provided with a chamfer formed to be inclined toward the side away from the stator core.

[0035] Another embodiment of the present invention for solving the above problem provides an electric compressor including: a housing; a compression unit that compresses refrigerant introduced into the housing; an electric motor provided in the housing to drive the compression unit, the electric motor including a stator according to any one of the above embodiments and a rotor that rotates due to electromagnetic interaction with the stator; and an inverter unit that is disposed on one side of the housing to control the electric motor, wherein the insulating cover unit is disposed on one end of the stator core far from the inverter unit, and a cluster through which a connecting pin for electrically connecting the coil and the inverter unit passes is disposed on the other end of the stator core close to the inverter unit.

[0036] According to the present invention, since the insulating protrusions are integrally provided on the inner surface of the insulating cover portion, a creepage distance between adjacent coils in the slot of the guide portion can be secured with a simple structure. Since the insulating protrusions are provided on the inner surface of the existing insulating cover portion that covers the insulating assembly to prevent the inflow of foreign substances, a separate member for connecting the insulating protrusions is not required, thereby reducing material costs. In addition, since manual work can be eliminated, automation is possible, and process time and costs can be reduced. Ultimately, defects can be reduced, thereby improving product quality.

[0037] In addition, even if the insulating cover part is divided into a plurality of insulating members and assembled radially inwardly to the insulating assembly, or the insulating protrusion is made of rubber material and assembled axially to the insulating assembly, the insulating protrusion can pass through the coil as it deforms, making it easy to assemble the insulating cover part.

[0038] Additionally, since the insulating projection protrudes radially inward more than the coil that is seated in the first groove, a sufficient creepage distance between the coils can be secured.

[0039] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0040] FIG. 1 is a cross-sectional view schematically illustrating an electric compressor according to one embodiment of the present invention.

[0041] Fig. 2 is a perspective view showing the stator of the electric motor of Fig. 1.

[0042] Figure 3 is a perspective view showing the insulating cover part separated from Figure 2.

[0043] Fig. 4 is a perspective view of Fig. 3, with the insulating cover portion omitted, viewed from another side.

[0044] Figure 5 is a vertical cross-sectional view of a portion of Figure 2.

[0045] Figure 6 is a horizontal cross-sectional view of Figure 2.

[0046] Fig. 7 is a bottom view of the insulating cover part of Fig. 2.

[0047] Fig. 8 is a perspective view showing a state in which the first insulating member and the second insulating member of the insulating cover part of Fig. 2 are separated.

[0048] Fig. 9 is a partial cross-sectional view illustrating another embodiment of an insulating protrusion.

[0049] Fig. 10 is a perspective view showing another embodiment of an insulating cover part.

[0050] Fig. 11 is a perspective view showing the first to fourth insulating members of the insulating cover portion of Fig. 10 separated.

[0051] Fig. 12 is a perspective view of the insulating cover part of Fig. 10 viewed from below.

[0052] Fig. 13 is a bottom view of the insulating cover part of Fig. 10.

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

[0054] In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator. The examples below do not limit the scope of the present invention, but are merely exemplary of the components presented in the claims of the present invention.

[0055] To clearly explain the present invention, irrelevant parts have been omitted, and the same reference numerals are used throughout the specification to refer to identical or similar components. Throughout the specification, when a part is said to "include" a certain component, unless specifically stated otherwise, this does not mean that other components may be included, but rather that other components may be included.

[0056] Furthermore, components represented as "~bu" throughout the specification may be two or more components combined into a single component, or a single component may be further subdivided into two or more components with more detailed functions. Furthermore, each component described below may, in addition to its own primary function, additionally perform some or all of the functions performed by other components. Furthermore, some of the primary functions of each component may be exclusively performed by other components.

[0057]

[0058] First, let us briefly examine an electric compressor (1) according to an embodiment of the present invention with reference to FIG. 1. The electric compressor (1) may be a vehicle electric compressor used in an air conditioning system of an electric vehicle or hybrid vehicle.

[0059] The electric compressor (1) of the present invention largely includes a housing (100), an electric motor (200), a compression unit (300), and an inverter unit (400).

[0060] The housing (100) forms the exterior of the electric compressor (1), and in this embodiment, is composed of a front housing (motor housing, 120) and a rear housing (compressor housing, 140).

[0061] An electric motor (200) is provided within the front housing (120) and provides power for the compression unit (300) to compress the refrigerant. The electric motor (200) may include a rotor (220) coupled to a rotation shaft (500) rotatably installed at the center of the front housing (120), and a stator (1000) fixed to the front housing (120) and positioned radially outside the rotor (220). The stator (1000) forms an electromagnetic field by power applied from the inverter unit (400), and as the rotor (220) rotates due to electromagnetic interaction with the stator (1000), a rotational force for driving the compression unit (300) is generated.

[0062] The compression unit (300) compresses the refrigerant introduced into the housing (100). In the present embodiment, the compression unit (300) is provided in the rear housing (140) and may include a rotating scroll (320) coupled to a rotating shaft (500) through an eccentric bush, and a fixed scroll (340) that forms a compression chamber in which the refrigerant is compressed together with the rotating scroll (320). In this way, since the compression unit (300) is connected to the electric motor (200) through the rotating shaft (500), the rotational force generated by the electric motor (200) can be transmitted to the rotating scroll (320) of the compression unit by the rotating shaft (500). However, the present invention is not limited thereto, and it is obvious that other types of compression units may be used.

[0063] The inverter unit (400) is arranged on one side of the housing (100), but is arranged on the opposite side of the compression unit (300) with respect to the electric motor (200). The inverter unit (400) is electrically connected to the electric motor (200), and supplies power to the electric motor (200) and controls its operation through power and control signals transmitted from the outside.

[0064] At this time, the electric motor (200) and the inverter unit (400) can be electrically connected by a connecting pin (600). In the present embodiment, since a three-phase motor is used, three connecting pins (600) connected to each of the three phases can be provided to supply three-phase power from the inverter unit (400) to the electric motor (200). The three connecting pins (600) are each 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 unit (400). Each of the connecting pins (600) protruding into the inside of the inverter unit (400) is electrically connected to the circuit board of the inverter unit.

[0065]

[0066] The following description will focus on the stator (1000) of the electric motor (200) with reference to FIGS. 2 to 8.

[0067] The stator (1000) largely includes a stator core (1200), a coil (1300), an insulating assembly (1500), an insulating cover (1700), and an insulating projection (1800).

[0068] The stator core (1200) includes a cylindrical body (1210) and a plurality of teeth (1220) that protrude radially inward from the body (1210). In the present embodiment, twelve teeth (1220) are illustrated, but the present invention is not limited thereto. A coil (1300) is wound around each tooth (1220). To this end, a certain space is formed between adjacent teeth (1220) so that the coil (1300) can be wound. For example, a coil (1300) corresponding to the U phase of a three-phase power supply may be wound around four teeth (1220), a coil (1300) corresponding to the V phase of a three-phase power supply may be wound around the other four teeth (1220), and a coil (1300) corresponding to the W phase of a three-phase power supply may be wound around the remaining four teeth (1220).

[0069] The insulation assembly (1500) is formed at one end of the stator core (1200) and insulates between the stator core (1200) and the coil (1300). The insulation assembly (1500) also provides wiring for the coil (1300) extended to one end of the stator core (1200). In particular, the insulation assembly (1500) described in the present invention is disposed at one end of the stator core (1200) that is far from the inverter unit (400). However, a separate insulation assembly for insulation may also be disposed at the other end of the stator core (1200) that is close to the inverter unit (400).

[0070] The insulating assembly (1500) includes a plurality of insulating teeth (1510) that contact the upper surface of each of the plurality of teeth (1220) and on which the coil (1300) is wound, 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 surround both the insulating teeth (1510) and the teeth (1220).

[0071] The guide portion (1520) is formed in a cylindrical shape to correspond to the stator core (1200) and is located on the outer diameter side of the stator core (1200). A coil (1300) extended to one end of the stator core (1200) is arranged on the outer surface of the guide portion (1520). To this end, a second groove (1522) is formed on the outer surface of the guide portion (1520) in which the coil (1300) extended to one end of the stator core (1200) is seated. Specifically, the coil (1300) wound around the teeth (1220) and the insulating teeth (1510) is extended from one end of the stator core (1200) to the radially outer surface of the guide portion (1520) and seated in the second groove (1522). To this end, the guide portion (1520) is provided with a plurality of slots (1524) along the circumference of the guide portion (1520) through which the coil (1300) is withdrawn. The positions and heights of the plurality of slots (1524) can be formed in various ways as needed. Three second grooves (1522) are provided along the height direction of the guide portion (1520) so that the three-phase coils (1300) can be respectively seated.

[0072] The insulating cover part (1700) covers the insulating assembly (1500) to prevent foreign substances from entering from the outside. According to the present invention, the inner surface of the insulating cover part (1700) is provided with a plurality of insulating protrusions (1800) that protrude radially inwardly corresponding to at least some of the plurality of slots (1524). Accordingly, as illustrated in FIG. 2, when the insulating cover part (1700) is coupled to the insulating assembly (1500), at least some of the plurality of slots (1524) are filled by the plurality of insulating protrusions (1800).

[0073] A first groove (1820) is formed in the insulating projection (1800) in which a coil (1300) drawn out from one end of the stator core (1200) is seated. That is, the coil (1300) is seated in the second groove (1522) when passing the outer surface of the guide portion (1520), and is seated in the first groove (1820) when passing the insulating projection (1800) arranged in the slot (1524) of the guide portion (1520).

[0074] In particular, the insulating protrusion (1800) is only disposed in the slot (1524) where the coil (1300) is drawn out to the outer surface of the guide portion (1520) and passes along the circumferential direction among the plurality of slots (1524). Accordingly, even if coils (1300) of different phases pass along the circumferential direction in parallel within the slot (1524) as illustrated in FIG. 4, a short circuit does not occur because the adjacent coils (1300) are insulated by the insulating protrusion (1800). That is, the creepage distance between the adjacent coils (1300) is secured. Here, the creepage distance corresponds to the shortest distance measured along the surface of the insulating material between two conductive parts, and in the present invention, it will correspond to the shortest distance along the surface of the insulating protrusion (1800) between the adjacent coils (1300).

[0075] On the other hand, the insulating protrusion (1800) is not arranged in the slot (1524) where the coil (1300) does not pass along the circumference of the guide portion (1520). As a result, a section in which the insulating protrusion (1800) is not formed occurs in the insulating cover portion (1700), as illustrated in FIG. 7. For example, the insulating protrusion (1800) may not be formed in a section of at least 1 / 4 of the insulating cover portion (1700).

[0076] In this way, the number and position of the insulating protrusions (1800) may vary depending on the position of the coil (1300) being pulled out.

[0077] According to the present invention, since the insulating projection (1800) is integrally provided on the inner surface of the insulating cover portion (1700), a creepage distance between adjacent coils (1300) in the slot (1524) of the guide portion can be secured with a simple structure.

[0078] In particular, as illustrated in Fig. 5, it is preferable that the insulating protrusion (1800) protrude radially inwardly more than the coil (1300) seated in the first groove (1820). This allows a sufficient creepage distance between the coils (1300) to be secured.

[0079] Additionally, it is preferable that the height (h) of the first groove (1820) be slightly larger than the diameter of the coil (1300) so that the coil (1300) can be maintained in position without being pressed within the first groove (1820).

[0080] In this embodiment, the insulating cover part (1700) and the insulating protrusion (1800) are integrally formed from the same plastic resin material. At this time, in order to facilitate assembly of the insulating cover part (1700), the insulating cover part (1700) is formed by combining multiple insulating members. The number of insulating members may be formed in various ways, such as two, three, or four, but in this embodiment, the insulating cover part (1700) is described based on the case where the first insulating member (1700a) and the second insulating member (1700b) are combined with each other.

[0081] The first insulating member (1700a) and the second insulating member (1700b) are each radially inwardly coupled to the insulating assembly (1500), and the first insulating member (1700a) and the second insulating member (1700b) are coupled to each other by elastic press fitting so that they do not come off in the radial direction. To this end, each of the first insulating member (1700a) and the second insulating member (1700b) is provided with a coupling portion for coupling to an adjacent insulating member.

[0082] Specifically, the connecting portion may be formed as a connecting projection or a connecting groove into which a connecting projection can be inserted, and a connecting projection and a connecting groove are respectively provided at opposite ends of adjacent insulating members so that the connecting projection and the connecting groove can be elastically connected. In the present embodiment, a connecting projection (1722) is provided at one end of the second insulating member (1700b) facing the first insulating member (1700a), and a connecting groove (1724) into which the connecting projection (1722) is inserted is provided at one end of the first insulating member (1700a). Conversely, a connecting groove (1724) is provided at the other end of the second insulating member (1700b) facing the first insulating member (1700a), and a connecting projection (1722) is provided at the other end of the first insulating member (1700a). That is, each of the plurality of insulating members (1700a, 1700b) corresponds to an insulating member having a joining projection (1722) formed at one end and a joining groove (1724) formed at the other end.

[0083] However, it is not limited thereto, and a coupling protrusion or a coupling groove may be provided at both one end and the other end of the first insulating member (1700a), and a coupling groove or a coupling protrusion may be provided at both one end and the other end of the second insulating member (1700b). That is, among the plurality of insulating members (1700a, 1700b), some may be insulating members in which a coupling groove (1724) is formed at both one end and the other end, and the rest may be insulating members in which a coupling protrusion (1722) is formed at both one end and the other end.

[0084] In particular, the joining groove (1724) has a portion that becomes wider as it becomes deeper, and the joining projection (1722) has a shape corresponding to the joining groove (1724). In the present embodiment, the joining projection (1722) and the joining groove (1724) have a corresponding circular shape. As a result, the joining projection (1722) is not dislodged in the radial direction after being pressed into the joining groove (1724) by the elasticity of the plastic material. In other words, the first insulating member (1700a) and the second insulating member (1700b) do not separate from each other.

[0085] In addition, 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 the first groove (1820) of the insulating protrusion (1800) provided on the first insulating member (1700a) and also passes through the first groove (1820) of the insulating protrusion (1800) provided on the second insulating member (1700b), so that the first insulating member (1700a) and the second insulating member (1700b) can be fixed in position with each other without being displaced in the axial direction.

[0086] In order to determine the position of the insulating cover part (1700) with respect to the insulating assembly (1500), the insulating cover part (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.

[0087] In the present 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, it is preferable that the first insulating member (1700a) provided with more insulating protrusions (1800) be coupled to the insulating assembly (1500) before the second insulating member (1700b). This is because the first insulating member (1700a) can be more firmly positioned on the insulating assembly (1500) than the second insulating member (1700b) due to the greater number of insulating protrusions (1800). To this end, a first positioning part is provided on the first insulating member (1700a) provided with more insulating protrusions (1800), and a second positioning part is provided at a position of the insulating assembly (1500) corresponding to the first positioning part. In this embodiment, the first positioning part corresponds to the positioning groove (1730), and the second positioning part corresponds to the positioning protrusion (1530) inserted into the positioning groove (1730). However, this is not limited to this, and the first positioning part may correspond to the positioning protrusion, and the second positioning part may correspond to the positioning groove.

[0088] Additionally, according to an embodiment, the first insulating member (1700a) and the second insulating member (1700b) may be fixed by an adhesive without the joining projection (1722) and the joining groove (1724).

[0089] In this way, the insulation cover part (1700) is divided into a plurality of insulation members and assembled radially inwardly into the insulation assembly (1500), making it easy to assemble the insulation cover part.

[0090] Additionally, after the first insulating member (1700a) and the second insulating member (1700b) are bonded to each other, impregnation may be performed. This allows the epoxy to penetrate and harden, thereby acting as a secondary bonding agent between the first insulating member (1700a) and the second insulating member (1700b).

[0091] An insulating cover (1700) is disposed at one end of the stator core (1200) far from the inverter section (400) in the electric compressor (1), while a cluster (1900) is disposed at the other end of the stator core (1200) close to the inverter section (400) through which a connection pin (600) for electrically connecting a coil (1300) and the inverter section (400) passes. The cluster (1900) forms an insulating structure between the connection pin (600) and the coil (1300).

[0092]

[0093] Next, let us look at an insulating cover part (1700) according to another embodiment with reference to FIG. 9.

[0094] In this embodiment, the insulating cover part (1700) is formed of a single member, the insulating protrusion (1800) is formed of a rubber material, and at least a portion of the insulating cover part (1700) is formed of a plastic material, so that the insulating cover part (1700) and the insulating protrusion (1800) are double-injected.

[0095] The insulating cover part (1700) is formed of a single member and is thus assembled axially with respect to the insulating assembly (1500). At this time, since the insulating protrusion (1800) is formed of a rubber material, the insulating protrusion (1800) can pass through the coil (1300) as it deforms.

[0096] At this time, so that the insulating projection (1800) can be easily deformed and the insulating cover part (1700) can be easily assembled, a chamfer part (1840) formed to be inclined toward the side away from the stator core (1200) may be provided on the end surface of the insulating projection (1800) facing the stator core (1200).

[0097] In addition, if the side of the insulating cover part (1700) provided with the insulating protrusion (1800) is formed of a rubber material together with the insulating protrusion (1800), it may be possible to assemble the insulating cover part (1700) by expanding the side of the insulating cover part (1700) when assembling it in the axial direction with respect to the insulating assembly (1500).

[0098]

[0099] Next, let us look at an insulating cover part (2700) according to another embodiment with reference to FIGS. 10 to 13.

[0100] In this embodiment, the insulating cover part (2700) is formed by combining a plurality of insulating members, and a first insulating member (2700a), a second insulating member (2700b), a third insulating member (2700c), and a fourth insulating member (2700d) are combined with each other.

[0101] Similarly, both ends of each of the first to fourth insulating members (2700a-d) are provided with a connecting portion for connecting with an adjacent insulating member. In the present embodiment, among the plurality of insulating members (2700a-d), some are insulating members having a connecting projection (2722) formed at one end and a connecting groove (2724) formed at the other end, others are insulating members having a connecting groove (2724) formed at both one end and the other end, and the rest are insulating members having a connecting projection (2722) formed at both one end and the other end.

[0102] Specifically, both ends of the first insulating member (2700a) are provided with a joining groove (2724), and both ends of the fourth insulating member (2700d) facing the first insulating member (2700a) are provided with joining protrusions (2722). In addition, the second insulating member (2700b) is provided with a joining protrusion (2722) at one end facing the first insulating member (2700a), and with a joining groove (2724) at the other end facing the fourth insulating member (2700d). Similarly, the third insulating member (2700c) is provided with a joining protrusion (2722) at one end facing the first insulating member (2700a), and with a joining groove (2724) at the other end facing the fourth insulating member (2700d).

[0103] Accordingly, as shown by the arrows in Fig. 11, 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 a straight line in the horizontal direction. More specifically, it is preferable that the first insulating member (2700a) is first assembled to the insulating assembly, then the second insulating member (2700b) and the third insulating member (2700c) are assembled on both sides of the first insulating member (2700a), and finally the fourth insulating member (2700d) is assembled. That is, first, an insulating member having a joining groove (2724) formed at both ends is assembled, and last, an insulating member having a joining protrusion (2722) formed at both ends is assembled. This is the most efficient assembly sequence in an automated assembly line and prevents damage to joints during assembly.

[0104] At this time, as illustrated in Fig. 10, it is preferable that the coupling protrusion (2722) provided at one end of one insulating member protrude along a direction perpendicular to the tangent line at the middle position of the corresponding insulating member. Referring to Fig. 10, it can be confirmed that the direction in which the coupling protrusion (2722) provided at one end of the second insulating member (2700b) protrudes, that is, the center line (CL) of the coupling protrusion (2722), is perpendicular to the tangent line (T) at the middle position of the second insulating member (2700b). Likewise, the coupling protrusion (2722) provided at one end of the third insulating member (2700c) also protrudes along a direction perpendicular to the tangent line at the middle position of the third insulating member (2700c), and the coupling protrusions (2722) provided at each end of the fourth insulating member (2700d) also protrude along a direction perpendicular to the tangent line at the middle position of the fourth insulating member (2700d). That is, the coupling protrusion (2722) provided at one insulating member is formed in a direction parallel to the direction in which the corresponding insulating members are assembled.

[0105] This is to enable assembly by moving multiple insulating members (2700a-d) from the radial outside to the inside while the stator core is fixed in the center on an automated assembly line, so that the coupling projections (2722) and coupling grooves (2724) can be assembled simultaneously while the insulating members move.

[0106] This allows for easy assembly in a straight line without the insulation material being spread apart, and there is no concern about the insulation material being damaged or its durability being reduced.

[0107] In addition, at least two of the plurality of insulating members are each provided with at least one insulating protrusion (2800). This allows the plurality of insulating members to be fixed in position without being axially displaced. In the present embodiment, as illustrated in FIG. 13, the first to third insulating members (2700a-c) are each provided with an insulating protrusion (2800), and the fourth insulating member (2700d) is not provided with an insulating protrusion (2800). This may be varied in various ways when the number and position of the insulating protrusions (2800) vary depending on the coil's withdrawal position, etc.

[0108] In this embodiment, the positioning groove (2730) is illustrated as being provided in the fourth insulating member (2700d) that is not provided with an insulating protrusion (2800). In some cases, it is to be understood that the positioning groove (2730) may be preferably provided in the first insulating member (2700a) or the second insulating member (2700b) that is provided with the most insulating protrusions (2800) among the plurality of insulating members.

[0109] Likewise, after the first to fourth insulating members (2700a-d) are bonded to each other, impregnation can be performed to further secure the first to fourth insulating members (2700a-d).

[0110] If the number of the above-mentioned plurality of insulating members is too small, there is a problem that each insulating member may be assembled with too much separation and be damaged, and if the number is too large, the assembly process may be complicated and the insulating protrusions may have to be formed adjacent to the ends of the insulating members, which may cause difficulties in forming. Accordingly, in the present invention, in order to minimize the above-mentioned problem, an insulating cover part is formed with four insulating members along with an insulating cover part with at least two insulating members. However, the number of insulating members may vary depending on the size of the stator, slots, and the number and positions of the insulating protrusions.

[0111] The present invention is not limited to the specific embodiments and descriptions described above, and anyone with ordinary skill in the art to which the present invention pertains can make various modifications without departing from the gist of the present invention as claimed in the claims, and such modifications are within the protection scope of the present invention.

[0112] The present invention relates to a stator of an electric motor and an electric compressor, which can secure a creepage distance between adjacent coils in a slot of a guide part with a simple structure by means of an insulating protrusion provided on the inner surface of an insulating cover part, and which can reduce material costs.

Claims

1. A stator core having a plurality of teeth on which coils are wound; An insulating assembly formed at one end of the stator core and including a guide portion on which the coil extended to one end of the stator core is arranged on the outer surface; It includes an insulating cover part covering the above insulating assembly; The above guide portion is provided with a plurality of slots spaced apart along the circumferential direction, A stator of an electric motor, characterized in that the inner surface of the insulating cover portion is provided with a plurality of insulating protrusions protruding radially inward corresponding to at least some of the plurality of slots.

2. In paragraph 1, A stator of an electric motor, characterized in that a first groove is formed in the insulating projection, into which the coil extended to one end of the stator core is seated.

3. In paragraph 2, A stator of an electric motor, characterized in that the height of the first groove is greater than the diameter of the coil.

4. In paragraph 2, A stator of an electric motor, characterized in that the insulating protrusion protrudes radially inward more than the coil mounted in the first groove.

5. In paragraph 2, A stator of an electric motor, characterized in that the insulating cover part and the insulating protrusion are formed integrally.

6. In paragraph 2, A stator of an electric motor, characterized in that a second groove is formed on the outer surface of the guide portion, into which the coil extended to one end of the stator core is seated.

7. In paragraph 2, The above insulating cover part is provided with a first positioning part, A stator of an electric motor, characterized in that the insulating assembly is provided with a second positioning part that engages with the first positioning part.

8. In paragraph 7, A stator of an electric motor, characterized in that one of the first positioning part and the second positioning part is a positioning projection and the other is a positioning groove.

9. In paragraph 2, A stator of an electric motor, characterized in that the insulating cover part is formed by combining a plurality of insulating members.

10. In paragraph 9, A stator of an electric motor, characterized in that the plurality of insulating members and the insulating protrusions formed on the insulating members are formed of the same plastic resin material.

11. In paragraph 9, A stator of an electric motor, characterized in that at least two of the above-mentioned plurality of insulating members are each provided with at least one insulating protrusion.

12. In paragraph 11, A stator of an electric motor, characterized in that the number of insulating projections provided in one of the plurality of insulating members is greater than the number of insulating projections provided in the other.

13. In paragraph 12, Among the above-mentioned plurality of insulating members, the insulating member having the largest number of insulating protrusions is provided with a first positioning part, A stator of an electric motor, characterized in that the insulating assembly is provided with a second positioning part that engages with the first positioning part.

14. In paragraph 9, A stator of an electric motor, characterized in that each of the plurality of insulating members has a connecting portion at both ends for connecting to an adjacent insulating member.

15. In paragraph 14, The above-mentioned connecting portion is formed as a connecting projection or a connecting groove into which the connecting projection can be inserted, A stator of an electric motor, characterized in that the facing ends of adjacent insulating members are provided with the above-mentioned coupling projection and the above-mentioned coupling groove, so that the above-mentioned coupling projection and the above-mentioned coupling groove are coupled.

16. In paragraph 15, A stator of an electric motor, characterized in that the above plurality of insulating members are all insulating members having the above-mentioned coupling protrusion formed at one end and the above-mentioned coupling groove formed at the other end.

17. In paragraph 15, A stator of an electric motor, characterized in that some of the plurality of insulating members are insulating members having the above-described joining grooves formed at both one end and the other end, and the rest are insulating members having the above-described joining protrusions formed at both one end and the other end.

18. In paragraph 15, A stator of an electric motor, characterized in that some of the plurality of insulating members are insulating members having the coupling protrusion formed at one end and the coupling groove formed at the other end, other members are insulating members having the coupling groove formed at both one end and the other end, and the remainder are insulating members having the coupling protrusion formed at both one end and the other end.

19. In paragraph 18, A stator of an electric motor, characterized in that when assembling the plurality of insulating members, the insulating members are assembled in the following order: an insulating member having the coupling groove formed at both one end and the other end, an insulating member having the coupling protrusion formed at one end and the coupling groove formed at the other end, and an insulating member having the coupling protrusion formed at both one end and the other end.

20. In paragraph 15, A stator of an electric motor, characterized in that the coupling projection provided at one end of one insulating member protrudes along a direction perpendicular to a tangent line at a middle position of one of the insulating members.

21. In paragraph 20, A stator of an electric motor, characterized in that the plurality of insulating members are composed of four members.

22. In paragraph 9, A stator of an electric motor, characterized in that the plurality of insulating members are bonded to each other and then impregnated.

23. In paragraph 2, A stator of an electric motor, characterized in that the insulating protrusion is formed of a rubber material, at least a part of the insulating cover part is formed of a plastic material, and the insulating cover part and the insulating protrusion are double-injected.

24. In paragraph 23, A stator of an electric motor, characterized in that the end surface of the insulating projection facing the stator core is provided with a chamfer portion formed to be inclined toward the side away from the stator core.

25. Housing; A compression unit that compresses the refrigerant introduced into the housing; An electric motor provided in the housing and driving the compression unit, the electric motor including a stator according to any one of claims 1 to 24 and a rotor that rotates due to electromagnetic interaction with the stator; and An inverter unit is disposed on one side of the housing and controls the electric motor; The above insulating cover portion is placed at one end of the stator core far from the inverter portion, An electric compressor, characterized in that a cluster is arranged at the other end of the stator core close to the inverter section, through which a connecting pin for electrically connecting the coil and the inverter section passes.

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