Electric motor

Abstract

The present disclosure relates to an electric motor having a stator and a rotor, wherein the stator may include: a hollow cylinder-shaped core having a slot formed to extend through opposite ends of the core in an axial direction of the core; and a coil wound around the slot, the core may include: a first side core which forms one end of the core and in which a first section of the slot is formed; a second side core which forms the other end of the core and in which a second section of the slot is formed; a middle core which is located between the first and second side cores and in which a third section of the slot connecting the first and second sections is formed; and a hole formed from the outer circumferential surface of the middle core toward the third section and providing an oil fluid channel.

Description

electric motor

[0001] The present disclosure relates to an electric motor. More specifically, the present disclosure relates to an electric motor with improved cooling performance.

[0002] An electric motor is a device that converts electrical energy into rotational kinetic energy. The electromagnetic interaction between the stator and rotor of an electric motor causes the rotor to rotate at high speeds. The rotational power generated by an electric motor can be used in a variety of products, including electric vehicles. Recently, with the rapid growth of the electric vehicle (EV) market, research into high-speed, high-output electric motors is actively underway.

[0003] However, the heat generated by electric motors has made it difficult to improve their performance. In particular, there has been the difficulty of effectively cooling the stator coils, which form hot spots.

[0004] The present disclosure aims to solve the above-mentioned and other problems.

[0005] Another purpose may be to provide an electric motor with improved cooling performance.

[0006] Another purpose may be to provide a structure for directly cooling the coils of the stator with oil.

[0007] Another purpose may be to provide a structure that provides direct cooling with oil from the center of the coil to both ends.

[0008] Another purpose may be to provide a structure for the core of the stator that provides a flow of oil.

[0009] Another purpose may be to provide a holder that provides a path for oil to directly cool the coil.

[0010] Another purpose may be to provide a holder that holds the coil in place while providing electrical insulation between the coil and the core of the stator.

[0011] Another purpose may be to provide a structure that forms a zigzag path of oil in the center of the core to increase the cooling efficiency of the stator.

[0012] Another purpose may be to provide a structure for securing the end-turn portion of the coil.

[0013] Another purpose may be to provide a structure that can reduce the volume of the electric motor and reduce the manufacturing cost of the electric motor.

[0014] According to one aspect of the present disclosure for achieving the above or other purposes, in an electric motor having a stator and a rotor, the stator may include: a core having a hollow cylinder shape; a core having a slot formed by penetrating both ends of the core in an axial direction of the core; and a coil wound around the slot, wherein the core may include: a first side core forming one end of the core and having a first section of the slot formed; a second side core forming the other end of the core and having a second section of the slot formed; a middle core positioned between the first and second side cores and having a third section of the slot connecting the first and second sections formed; and a hole formed from an outer circumferential surface of the middle core toward the third section and providing a flow path for oil.

[0015] The effects of the electric motor according to the present disclosure are described as follows.

[0016] According to at least one of the embodiments of the present disclosure, an electric motor with improved cooling performance can be provided.

[0017] According to at least one of the embodiments of the present disclosure, a structure for directly cooling a coil of a stator with oil can be provided.

[0018] According to at least one of the embodiments of the present disclosure, a structure can be provided that directly cools the coil with oil from the center to both ends.

[0019] According to at least one of the embodiments of the present disclosure, a structure of a core of a stator providing a flow path of oil can be provided.

[0020] According to at least one of the embodiments of the present disclosure, a holder providing a path of oil for directly cooling a coil can be provided.

[0021] According to at least one of the embodiments of the present disclosure, a holder may be provided that fixes the position of the coil while providing electrical insulation between the coil and the core of the stator.

[0022] According to at least one of the embodiments of the present disclosure, a structure can be provided that forms a zigzag oil path in the center of the core to increase the cooling efficiency of the stator.

[0023] According to at least one of the embodiments of the present disclosure, a structure for fixing an end-turn portion of a coil can be provided.

[0024] According to at least one of the embodiments of the present disclosure, a structure can be provided that can reduce the volume of an electric motor and reduce the manufacturing cost of the electric motor.

[0025] Further scope of the applicability of the present disclosure will become apparent from the detailed description below. However, since various modifications and variations within the spirit and scope of the present disclosure will become apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present disclosure, are given by way of example only.

[0026] Figures 1 to 26 are drawings illustrating examples of electric motors according to embodiments of the present disclosure.

[0027] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components are given the same reference numbers and redundant descriptions thereof will be omitted.

[0028] The suffixes "module" and "part" used for components in the following description are given or used interchangeably only for the convenience of writing specifications, and do not have distinct meanings or roles in themselves.

[0029] In addition, when describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present disclosure.

[0030] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0031] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0032] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0033] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0034] The direction indications of up (U), down (D), left (Le), right (Ri), front (F), and back (R) shown in the drawings are only for convenience of explanation, and the technical ideas disclosed in this specification are not limited thereby.

[0035]

[0036] Referring to FIG. 1, an electric motor (M) may include a stator (1) and a rotor (2).

[0037] The stator (1) may have a hollow cylinder shape. A coil (30) may be wound around the stator (1), and current may flow through the coil (30). The coil (30) may be a component of the stator (1). The housing (3) may surround the side of the stator (1).

[0038] The rotor (2) may be positioned inside the stator (1) and may have a cylindrical shape. The rotor (2) may be provided with magnet(s), and when current flows through the coil (30) of the stator (1), the rotor (2) may rotate with respect to the stator (1). The magnet(s) may be a component of the rotor (2). The shaft (4) may be fixed to the center of the rotor (2) and may rotate together with the rotor (2). The rotation axis (A) of the shaft (4) may be parallel in the front-rear direction. For example, the shaft (4) may be connected to a drive shaft of an electric vehicle.

[0039]

[0040] Referring to FIG. 2, the stator (1) may include a core (10), a holder (20), and a coil (30).

[0041] The core (10) may have an overall hollow cylinder shape. The core (10) may include a first side core (11), a second side core (12), and a middle core (13). The first side core (11) may form one end of the core (10). The second side core (12) may form the other end of the core (10). The middle core (13) may be located between the first side core (11) and the second side core (12). The middle core (13) may form a central portion of the core (10). The first side core (11) may be referred to as a front core (11), the second side core (12) may be referred to as a rear core (12), and the middle core (13) may be referred to as a central core (13).

[0042] The holder (20) can be inserted into the slot (10S) of the core (10). A portion (211) of the first holder (21) can be inserted into the slot (11b) of the first side core (11). A portion (221) of the second holder (22) can be inserted into the slot (12b) of the second side core (12). The slot (13b) of the middle core (13) can provide a passage connecting the internal space of the portion (211) of the first holder (21) and the internal space of the portion (221) of the second holder (22). Alternatively, a portion (211) of the first holder (21) and / or a portion (221) of the second holder (22) may be inserted into the slot (13b) of the middle core (13). The slot (11b) of the first side core (11) can form a first section (11b) of the slot (10S). The slot (12b) of the second side core (12) can form a second section (12b) of the slot (10S). The slot (13b) of the middle core (13) can form a third section (13b) of the slot (10S), and the third section (13b) can connect the first and second sections (11b, 12b).

[0043] The coil (30) can be inserted into the holder (20) inserted into the slot (10S) of the core (10). The coil (30) can pass through the internal space of a part (211) of the first holder (21), the slot (13b) of the middle core (13), and the internal space of a part (221) of the second holder (22). The coil (30) can be wound around the slot (10S) and the holder (20). The coil (30) can be a hairpin coil (30). The coil (30) can be referred to as a conductor (30) or a wire (30).

[0044]

[0045] Referring to FIGS. 3 and 4, the first side core (11) may include a body (11a), a slot (11b), and a slit (11c).

[0046] The body (11a) may have a hollow cylinder shape. The length (l1) of the body (11a) may be smaller than the radius (r1) of the body (11a). The thickness (t1) of the body (11a) may be smaller than the length (l1) of the body (11a).

[0047] The slot (11b) may be formed by penetrating both ends of the body (11a) in the axial direction of the body (11a). That is, the length (l11) of the slot (11b) may be equal to the length (l1) of the body (11a). The slot (11b) may be adjacent to the inner peripheral surface (11aa) of the body (11a). The slot (11b) may extend in a direction intersecting the inner peripheral surface (11aa) and the outer peripheral surface (11ab) of the body (11a). The slot (11b) may extend in the radial direction of the first side core (11). The plurality of slots (11b) may be spaced apart from each other in the circumferential direction of the body (11a).

[0048] A slit (11c) may be formed on the inner surface (11aa) of the body (11a) and may face the slot (11b). The slot (11b) may be opened toward the slit (11c). The slit (11c) may be formed long along the slot (11b). The length (l12) of the slit (11c) may be the same as the length (l11) of the slot (11b). The width (w12) of the slit (11c) may be smaller than the width (w11) of the slot (11b). The plurality of slits (11c) may be spaced apart from each other in the circumferential direction of the body (11a) and may correspond to the plurality of slots (11b). Each of the plurality of slits (11c) may be aligned with each of the plurality of slots (11b). The slit (11c) and the slot (11b) can be aligned with each other in the radial direction of the first side core (11).

[0049] The first side core (11) may include plates laminated to each other. The first side core (11) is a collection of thin plates and may be referred to as a first lamination core (11). The plates of the first side core (11) may be bonded to each other. The plates of the first side core (11) may be referred to as sheets and may include a metal material such as steel. The plates constituting the first side core (11) may have the same shape and may form the body (11a), slot (11b), and slit (11c) described above.

[0050]

[0051] Referring to FIGS. 5 and 6, the second side core (12) may include a body (12a), a slot (12b), and a slit (12c).

[0052] The body (12a) may have a hollow cylinder shape. The length (l2) of the body (12a) may be smaller than the radius (r2) of the body (12a). The thickness (t2) of the body (12a) may be smaller than the length (l2) of the body (12a).

[0053] The slot (12b) may be formed by penetrating both ends of the body (12a) in the axial direction of the body (12a). That is, the length (l21) of the slot (12b) may be equal to the length (l2) of the body (12a). The slot (12b) may be adjacent to the inner peripheral surface (12aa) of the body (12a). The slot (12b) may extend in a direction intersecting the inner peripheral surface (12aa) and the outer peripheral surface (12ab) of the body (12a). The slot (12b) may extend in the radial direction of the second side core (12). The plurality of slots (12b) may be spaced apart from each other in the circumferential direction of the body (12a).

[0054] A slit (12c) may be formed on the inner surface (12aa) of the body (12a) and may face the slot (12b). The slot (12b) may be opened toward the slit (12c). The slit (12c) may be formed long along the slot (12b). The length (l22) of the slit (12c) may be equal to the length (l21) of the slot (12b). The width (w22) of the slit (12c) may be smaller than the width (w21) of the slot (12b). The slits (12c) of the abdomen may be spaced apart from each other in the circumferential direction of the body (12a) and may correspond to a plurality of slots (12b). Each of the plurality of slits (12c) may be aligned with each of the plurality of slots (12b). The slit (12c) and the slot (12b) can be aligned with each other in the radial direction of the second side core (12).

[0055] The second side core (12) may include plates laminated to each other. The second side core (12) is a collection of thin plates and may be referred to as a second lamination core (12). The plates of the second side core (12) may be bonded to each other. The plates of the second side core (12) may be referred to as sheets and may include a metal material such as steel. The plates constituting the second side core (12) may have the same shape and may form the aforementioned body (12a), slot (12b), and slit (12c).

[0056]

[0057] Referring again to FIGS. 3 to 6, the first side core (11) and the second side core (12) may have the same structure, shape, and material. In other words, the first and second side cores (11, 12) may be one type of side core. The first and second side cores (11, 12) may be collectively referred to as side cores.

[0058]

[0059] Referring to FIGS. 7 and 8, the middle core (13) may include a body (13a), a slot (13b), and a hole (13c).

[0060] The body (13a) may have a ring shape. The length (l3) of the body (13a) may be smaller than the radius (r3) of the body (13a). The thickness (t3) of the body (13a) may be larger than the length (l3) of the body (13a) and smaller than the radius (r3) of the body (13a).

[0061] The slot (13b) may be formed by penetrating both ends of the body (13a) in the axial direction of the body (13a). That is, the length (l31) of the slot (13b) may be equal to the length (l3) of the body (13a). The slot (13b) may be adjacent to the inner peripheral surface (13aa) of the body (13a). The slot (13b) may extend in a direction intersecting the inner peripheral surface (13aa) and the outer peripheral surface (13ab) of the body (13a). The slot (13b) may extend in the radial direction of the middle core (13). A plurality of slots (13b) may be spaced apart from each other in the circumferential direction of the body (13a).

[0062] The hole (13c) may be formed on the outer circumferential surface (13ab) of the body (13a) and may face the slot (13b). The hole (13c) may extend from the outer circumferential surface (13ab) of the body (13a) in the radial direction of the middle core (13). The slot (13b) may be open toward the hole (13c). The hole (13c) may be formed along the slot (13b). The width (w32) of the hole (13c) may be smaller than the width (w31) of the slot (13b). The plurality of holes (13c) may be spaced apart from each other in the circumferential direction of the body (13a) and may correspond to the plurality of slots (13b). Each of the plurality of holes (13c) may be aligned with each of the plurality of slots (13b).

[0063] The gum (13g) can form an inner surface (13aa) of the body (13a) and can form a closed loop. The teeth (13t) can protrude from the gum (13g) to form an outer surface (13ab) of the body (13a) and can be arranged along the gum (13g). A slot (13b) and a hole (13c) can be formed between the teeth (13t). That is, the teeth (13t) and a plurality of slots (13b) can be arranged alternately. The rib (13r) can be positioned in the hole (13c) and can connect the teeth (13t) that are next to each other. A rib (13r) positioned between a first tooth (13t, tooth) and a second tooth (13t, tooth) can protrude from the first tooth (13t) toward the second tooth (13t). One end of the rib (13r) can be fixed to the first tooth (13t), and the other end of the rib (13r) can be fixed to the second tooth (13t). A plurality of ribs (13r) can be positioned in a plurality of holes (13d). The body (13a) can include a gum (13g), a tooth (13t), and a rib (13r). Accordingly, the rigidity of the body (13a) can be improved.

[0064] The middle core (13) may include plates laminated to each other. The middle core (13) is a collection of thin plates and may be referred to as a lamination core (13). The plates of the middle core (13) may be bonded to each other. The plates of the middle core (13) may be referred to as sheets and may include a metal material such as steel. The plates constituting the middle core (13) may have the same shape and may form the aforementioned body (13a), slot (13b), and hole (13c).

[0065]

[0066] Referring to FIGS. 8 to 10, in the axial direction of the middle core (13), the middle core (13) can be divided into a first middle core (131) and a second middle core (132). The first middle core (131) can form one end (13V) of the middle core (13), and the second middle core (132) can form the other end (13W) of the middle core (13). The one end (13V) of the middle core (13) can be referred to as the first side (13V) of the middle core (13) and can face the first side core (11, see FIG. 2). The other end (13W) of the middle core (13) can be referred to as the second side (13W) of the middle core (13) and can face the second side core (12, see FIG. 2). The boundary line (13L) between the first middle core (131) and the second middle core (132) may be located in the middle of the first and second sides (13V, 13W) and may be formed along the circumferential direction of the middle core (13). For example, the distance between the boundary line (13L) and the first side (13V) and the distance between the boundary line (13L) and the second side (13W) may both be 2.5 mm. Each of the first and second middle cores (131, 132) may be a set of thin plates.

[0067] The first middle core (131) may be referred to as first plates (131) that are stacked on each other. The ribs (13r, ribs) of the first middle core (131) may be adjacent to the first side (13V) and may be spaced apart from each other in the depth direction (DR) of the hole (13c). The ribs (13r) may be positioned in each of the holes (13c) of the first middle core (131). For example, the number of ribs (13r) positioned in any one hole (13c) of the first middle core (131) may be two.

[0068] The second middle core (132) may be referred to as second plates (132) that are laminated to each other. The ribs (13r, ribs) of the second middle core (132) may be adjacent to the second side (13W) and may be spaced apart from each other in the depth direction (DR) of the hole (13c). The ribs (13r) may be positioned in each of the holes (13c) of the second middle core (132). For example, the number of ribs (13r) positioned in one hole (13c) of the second middle core (132) may be two.

[0069] The ribs (13r) of the first middle core (131) and the ribs (13r) of the second middle core (132) located in one hole (13c) of the middle core (13) may be arranged to be staggered in the depth direction (DR) of the hole (13c).

[0070]

[0071] Referring to FIG. 11 together with FIG. 8, the holes (13c) of the middle core (13) may include first holes (13ca) and second holes (13cb). In the circumferential direction of the middle core (13), the first holes (13ca) may be spaced apart from each other, and the second holes (13cb) may be arranged alternately with the first holes (13ca).

[0072] The ribs (13r) of the first middle core (131) may be adjacent to the first side (13V) and may include first ribs (13ra) and third ribs (13rc). The first ribs (13ra) may be positioned in each of the first holes (13ca) and may be spaced apart from each other in the depth direction (DR) of the first hole (13ca). The third ribs (13rc) may be positioned in each of the second holes (13cb) and may be spaced apart from each other in the depth direction (DR) of the second hole (13cb). In the depth direction (DR) of the first hole (13ca), the first rib (13ra) and the third rib (13rc) may be positioned at different heights (levels). For example, the first rib (13ra) may be positioned closer to the outer surface of the first middle core (131) than the third rib (13rc).

[0073] The ribs (13r) of the second middle core (132) may be adjacent to the second side (13W) and may include second ribs (13rb) and fourth ribs (13rd). The second ribs (13rb) may be positioned in each of the first holes (13ca) and may be spaced apart from each other in the depth direction (DR) of the first hole (13ca). The fourth ribs (13rd) may be positioned in each of the second holes (13cb) and may be spaced apart from each other in the depth direction (DR) of the second hole (13cb). In the depth direction (DR) of the second hole (13cb), the second rib (13rb) and the fourth rib (13rd) may be positioned at different heights (levels). For example, the fourth rib (13rd) may be positioned closer to the outer surface of the second middle core (132) than the second rib (13rb).

[0074] Accordingly, in the first holes (13ca), the first ribs (13ra) and the second ribs (13rb) may be arranged alternately. Also, in the second holes (13cb), the third ribs (13rc) and the fourth ribs (13rd) may be arranged alternately. This arrangement of the ribs (13ra, 13rb, 13rc, 13rd) may be referred to as a zigzag arrangement.

[0075] In the depth direction (DR) of the hole (13c) of the middle core (13), the height (level) of the second ribs (13rb) of the second middle core (132) may be the same as the height (level) of the third ribs (13ra) of the first middle core (131). In the depth direction (DR) of the hole (13c) of the middle core (13), the height (level) of the fourth ribs (13rd) of the second middle core (132) may be the same as the height (level) of the first ribs (13ra) of the first middle core (131).

[0076] In this case, when the second middle core (132) is rotated by an angle (theta 3) between the first hole (13ca) and the second hole (13cb) with respect to the first middle core (131) based on the axial direction of the middle core (13), the second and fourth ribs (13rb, 13rd) of the second middle core (132) can be aligned with the first and third ribs (13ra, 13rc) of the first middle core (131). Thus, unlike FIGS. 8 and 11, the second middle core (132) can be aligned with the first middle core (131).

[0077] In other words, for the zigzag arrangement of the ribs (13ra, 13rb, 13rc, 13rd) described above with the first and second middle cores (131, 132) having the same shape, the second middle core (132) aligned with the first middle core (131) can be rotated by an angle (theta 3) between the first hole (13ca) and the second hole (13cb) with respect to the first middle core (131). As a result, the second middle core (132) can be arranged to be staggered with respect to the first middle core (131), as shown in FIGS. 8 and 11.

[0078] For example, the number of holes (13c) of the middle core (13) may be 48, and the angle (theta 3) between the holes (13c) may be 7.5 degrees (360 degrees / 48). In this case, with respect to the axial direction of the middle core (13), the second middle core (132) may be rotated by 7.5 degrees or 172.5 degrees (=180 degrees-7.5 degrees) with respect to the first middle core (131) to form a zigzag arrangement of ribs (13ra, 13rb, 13rc, 13rd).

[0079]

[0080] Referring to FIGS. 12 and 13, the middle core (13) of the core (10) may be sandwiched between the first and second side cores (11, 12), and the first and second side cores (11, 12) and the middle core (13) may share a central axis (A1). The diameter of the middle core (13) may be the same as the diameters of the first and second side cores (11, 12). In the axial direction (A1) of the core (10), the length (l3) of the middle core (13) may be smaller than the lengths (l1, l2) of the first and second side cores (11, 12), respectively. At this time, the middle core (13) has a sword (13g) that forms a closed loop, but since the middle core (13) has a relatively small length (l3), the performance degradation of the electric motor (M) can be minimized.

[0081] In a direction parallel to the axial direction (A1) of the core (10), a plurality of slots (11b) of the first side core (11), a plurality of slots (12b, see FIG. 5) of the second side core (12), and a plurality of slots (13b, see FIG. 8) of the middle core (13) can be aligned with each other. The slots (11b, 12b, 13b) can have the same or corresponding shapes.

[0082] In a direction parallel to the axial direction (A1) of the core (10), the first and second side cores (11, 12) can block the holes (13c) of the middle core (13).

[0083] The first holder (21) may include a ring (210), a sleeve (211), and a protrusion (212).

[0084] The ring (210) may extend in the circumferential direction of the core (10). The ring (210) may be positioned at one end of the core (10), i.e., at the end of the first side core (11). The ring (210) may extend along the slots (11b) of the first side core (11) and may be positioned corresponding to the slots (11b). Through holes (210h) may be formed in the ring (210) and aligned with the slots (11b).

[0085] The sleeve (211) can protrude from the ring (210) toward the slot (11b) and can be inserted into the slot (11b). The sleeve (211) can be extended along the slot (11b) and have an internal space (211S). One end (inlet) of the internal space (211S) can face the through hole (210h) of the ring (210), and the other end (outlet) of the internal space (211S) can face the slot (13b, see FIG. 8) of the middle core (13). The length of the sleeve (211) can be equal to or corresponding to the length of the slot (11b). The cross-section of the sleeve (211) can correspond to the shape of the slot (11b). For example, the cross-section of the sleeve (211) can be rectangular. A plurality of sleeves (211) can be arranged along the ring (210) and spaced apart from each other. Each of the plurality of sleeves (211) can be inserted into each of the plurality of slots (11b).

[0086] The protrusion (212) may protrude from the ring (210) in a direction opposite to the sleeve (211). The height at which the protrusion (212) protrudes from the ring (210) may be less than the length of the sleeve (211). A plurality of protrusions (212) may be arranged along the ring (210) and may be spaced apart from each other. The plurality of protrusions (212) may be arranged to be staggered with the plurality of sleeves (211). That is, in the circumferential direction of the ring (210), the protrusions (212) may be arranged alternately with the through holes (210h).

[0087] The first holder (21) may include a non-conductive material. For example, the first holder (21) may include a plastic or resin material. For example, the first holder (21) may be joined to the first side core (11) through insert injection molding.

[0088] The second holder (22) may include a ring (220), a sleeve (221), and a protrusion (222).

[0089] The ring (220) may extend in the circumferential direction of the core (10). The ring (220) may be positioned on the other end of the core (10), i.e., the end of the second side core (12). The ring (220) may extend along the slots (12b, see FIG. 5) of the second side core (12) and may be positioned corresponding to the slots (12b). Through holes (220h) may be formed in the ring (220) and aligned with the slots (12b).

[0090] The sleeve (221) can protrude from the ring (220) toward the slot (12b, see FIG. 5) and can be inserted into the slot (12b). The sleeve (221) can be extended along the slot (12b) and have an internal space (221S). One end (inlet) of the internal space (221S) can face the through hole (220h) of the ring (220), and the other end (outlet) of the internal space (221S) can face the slot (13b, see FIG. 8) of the middle core (13). The length of the sleeve (221) can be equal to or corresponding to the length of the slot (12b). The cross-section of the sleeve (221) can correspond to the shape of the slot (12b). For example, the cross-section of the sleeve (221) can be rectangular. A plurality of sleeves (221) can be arranged along the ring (220) and spaced apart from each other. Each of the plurality of sleeves (221) can be inserted into each of the plurality of slots (12b).

[0091] The protrusion (222) may protrude from the ring (220) in a direction opposite to the sleeve (221). The height at which the protrusion (222) protrudes from the ring (220) may be less than the length of the sleeve (221). A plurality of protrusions (222) may be arranged along the ring (220) and may be spaced apart from each other. The plurality of protrusions (222) may be arranged to be staggered with the plurality of sleeves (221). That is, in the circumferential direction of the ring (220), the protrusions (222) may be arranged alternately with the through holes (220h).

[0092] The second holder (22) may include a non-conductive material. For example, the second holder (22) may include a plastic or resin material. For example, the second holder (22) may be joined to the second side core (12) through insert injection molding.

[0093] For example, the first holder (21) and the second holder (22) may have the same structure, shape, and material. In other words, the first and second holders (21, 22) may be one type of holder. The first and second holders (21, 22) may be collectively referred to as a holder (20).

[0094]

[0095] Referring to FIGS. 14 to 16, a coil (30) can be inserted into a holder (20). The coil (30) can be wound around the holder (20). The holder (20) made of a non-conductive material can provide electrical insulation between the coil (30) and the core (10). That is, insulating paper and / or varnish for electrical insulation between the coil (30) and the core (10) can be omitted, thereby minimizing processing of the lamination core (10), thereby minimizing degradation of the performance of the core (10). The coil (30) can include a plurality of pins (30P).

[0096] For example, the pin (30P) may have a hairpin shape. The pin (30P) may include a first portion (30Pa), a second portion (30Pb), and a third portion (30Pc). The first portion (30Pa) may be inserted into a sleeve (211, see FIG. 12) of the first holder (21) and a sleeve (221) of the second holder (22), and may extend along the sleeves (211, 221). The second portion (30Pb) may be bent from the first portion (30Pa) and may have a V shape. The third portion (30Pc) may be bent from the second portion (30Pb) and may be parallel to the first portion (30Pa). The third part (30Pc) can be inserted into sleeves (211, 221) spaced apart from the sleeves (211, 221) into which the first part (30Pa) is inserted. The pin (30P) can be referred to as a hairpin (30P), a U-shaped pin (30P), a coil (30P), a conductor (30P), or a wire (30P).

[0097] The protrusions (222) of the second holder (22) may have a corrugated shape on the ring (220). Some of the protrusions (222) may be positioned between the first portion (30Pa) and the third portion (30Pc) of the pin (30P). The second portion (30Pb) of the pin (30P) may be bent from the first and third portions (30Pa, 30Pc) and positioned on the protrusion (222). In this case, the movement of the pin (30P) in the direction from the second holder (22) toward the first holder (21) may be restricted by the second portion (30Pb) of the pin (30P) being caught on the protrusions (222) of the second holder (22). The second portion (30Pb) of the pin (30P) can protrude from the second holder (22) by a certain height (H2). The portion of the pin (30P) protruding from the second holder (22) can be referred to as a second end-turn portion (32).

[0098] The protrusions (212) of the first holder (21) may have a corrugated shape on the ring (210). Some of the protrusions (212) may be positioned between the first portion (30Pa) and the third portion (30Pc) of the pin (30P). The first and third portions (30Pa, 30Pc) of the pin (30P) may be bent or twisted outside the first holder (21) and positioned on the protrusions (212). In this case, the first and third portions (30Pa, 30Pc) of the pin (30P) may be caught on the protrusions (212) of the first holder (21), thereby restricting the movement of the pin (30P) from the first holder (21) toward the second holder (22). The first and third curved portions (30Pa, 30Pc) of the pin (30P) can protrude from the first holder (21) by a certain height (H1). The portion of the pin (30P) protruding from the first holder (21) can be referred to as a first end-turn portion (31).

[0099] Accordingly, the coil (30) wound around the holder (20) can be coupled to the holder (20). The pins (30P, pins) of the coil (30) can be arranged sequentially along the circumferential direction of the holder (20).

[0100]

[0101] Referring to FIG. 17, the sleeve (211) of the first holder (21) may be positioned inside the slot (11b) of the first side core (11), and a plurality of pins (30P, pins) of the coil (30) may be positioned in the internal space (211S) of the sleeve (211). The sleeve (211) may include a body (211a) and protrusions (211b).

[0102] The body (211a) can surround the fins (30P), and the cross-section of the body (211a) can correspond to the shape of the slot (11b). The cross-section of the body (211a) can be rectangular. The body (211a) can include two long sides (LS1, LS2) and two short sides (SS1, SS2, short sides). The fins (30P) can be arranged along the long sides (LS1, LS2). For example, the fins (30P) can form six layers. The direction in which the layers are stacked can be parallel to the radial direction of the core (10).

[0103] The protrusions (211b) may protrude from the body (211a) toward the pins (30P). Each of the pins (30P) may have a rectangular cross-section. The protrusions (211b) may be adjacent to four corners of each pin (30P). The protrusions (211b) may contact each pin (30P). The ends of the protrusions (211b) may be rounded. Accordingly, the pins (30P) may be coupled to the sleeve (211). That is, the positions of the pins (30P) inside the sleeve (211) may be fixed even without varnish. In addition, the gap between the pins (30P) inside the sleeve (211) and the inner surface of the slot (13b) of the middle core (13) is maintained, so that electrical insulation between the coil (30) and the core (10) may be maintained.

[0104] A path (211P) may be formed between the body (211a) and the fins (30P). The path (211P) may be formed between the protrusions (211b). The path (211P) may surround the fins (30P). The path (211P) may be an oil path (211P). That is, the cooling oil may contact the fins (30P) to directly cool the fins (30P).

[0105] The description of the sleeve (211) of the first holder (21) described above and below can be equally applied to the sleeve (221, see FIG. 12) of the second holder (22).

[0106]

[0107] Referring to Fig. 18, the sleeve (211) of the first holder (21) may include an insertion groove (211c). The insertion groove (211c) may be formed on the outer surface of the body (211a) of the sleeve (211). The insertion groove (211c) may be positioned opposite the protrusions (211b) of the sleeve (211). For example, a portion of the body (211a) may be pressed toward the pin (30P) to form the protrusions (211b) and the insertion grooves (211c).

[0108] The guide protrusions (11t) can protrude from the inner surface of the slot (11b) of the first side core (11) toward the insertion groove (211c) and can be inserted into the insertion groove (211c). The guide protrusions (11t) can have a shape corresponding to the insertion grooves (211c), and the ends of the guide protrusions (11t) can be rounded.

[0109] Accordingly, the guide protrusion (11t) and the insertion groove (211c) can guide the combination of the slot (11b) and the sleeve (211).

[0110] The insertion protrusion (211d) may protrude from one side of the body (211a) facing the slit (11c), i.e., the second short side (SS2). The insertion protrusion (211d) may be inserted into the slit (11c) to block the slit (11c). Here, the width (w12) of the slit (11c) may be smaller than the width (w3) of the pin (30P). Accordingly, the sleeve (211) of the first holder (21) may cover the slit (11c) of the first side core (11).

[0111]

[0112] Referring to Fig. 19, the outer surface of the body (211a) of the sleeve (211) may be flat without a groove, and the inner surface of the slot (11b) of the first side core (11) may also be flat without a protrusion and be parallel to the outer surface of the body (211a). That is, the insertion groove (211c) and the guide protrusion (11t) described above with reference to Fig. 18 may be omitted.

[0113]

[0114] Referring to FIGS. 20 and 21 together with FIG. 1, the housing (3) may have a hollow cylinder shape. The housing (3) may surround the outer circumference of the core (10) of the stator (1). The diameter of the middle core (13) may be the same as the diameters of the first and second side cores (11, 12) (see FIGS. 12 and 13). An annular channel (3c) may be recessed from the inner circumference of the housing (3) and may extend in the circumferential direction of the housing (3). A portion of the inner circumference of the housing (3) located outside the channel (3c) may contact the first and second side cores (11, 12). The channel (3c) may face the middle core (13) of the core (10), and the holes (13c) of the middle core (13) may be arranged along the channel (3c). A port (3a) can be formed in the housing (3), and an oil inlet (3b) connected to a channel (3c) can be formed in the port (3a).

[0115] Accordingly, oil (Oi) introduced into the oil inlet (3b) can be provided to the holes (13c) of the middle core (13) through the channel (3c).

[0116]

[0117] Referring to FIG. 22 together with FIG. 1, the diameter (D3) of the middle core (13) may be smaller than the diameters (D1, D2) of the first and second side cores (11, 12). The middle core (13) may form a step lowered from the first and second side cores (11, 12). The middle core (13) may form the bottom of an annular channel (13g) formed on the outer surface of the core (10) of the stator (1), and the first and second side cores (11, 12) may form side walls of the channel (13g). The holes (13c) of the middle core (13) may be arranged along the channel (13g).

[0118] The housing (3) may have a hollow cylinder shape. The housing (3) may surround the outer circumference of the core (10) of the stator (1).

[0119] For example, an annular channel corresponding to the middle core (13) may not be formed on the inner surface of the housing (3). In this case, the inner surface of the housing (3) may be in contact with the first and second side cores (11, 12), and the channel (13g) may be formed between the middle core (13) and the inner surface of the housing (3).

[0120] As another example, an annular channel (3c, see FIG. 20) corresponding to the middle core (13) may be formed on the inner surface of the housing (3). In this case, a portion of the inner surface of the housing (3) located outside the channel (3c) may be in contact with the first and second side cores (11, 12), and the channels (13g, 3c) may be arranged side by side.

[0121] A port (3a, port) can be formed in the housing (3), and an oil inlet (3b) connected to a channel (13g) or channels (13g, 3c) can be formed in the port (3a).

[0122] Accordingly, oil (Oi) introduced into the oil inlet (3b) can be provided to the holes (13c) of the middle core (13) through the channel (13g) or channels (13g, 3c).

[0123]

[0124] Referring to FIGS. 23 and 24, the hole (13c) of the middle core (13) can be formed by penetrating both sides of the middle core (13). In the axial direction of the core (10), the first and second side cores (11, 12) can block the hole (13c) of the middle core (13).

[0125] The coils (30) can penetrate the sleeve (211) inserted into the slot (11b) of the first side core (11), the slot (13b) of the middle core (13), and the sleeve (221) inserted into the slot (12b) of the second side core (12).

[0126] Oil (Oi) flowing into the hole (13c) of the middle core (13) can pass between the ribs (13r) formed on the inner surface of the hole (13c). At this time, since the ribs (13r) are arranged in a zigzag pattern, the flow path (Pi) of the oil (Oi) passing through the hole (13c) can also be formed in a zigzag pattern. Accordingly, the flow path (Pi) of the oil (Oi) passing through the hole (13c) can be lengthened, thereby increasing the contact area between the oil (Oi) and the middle core (13). In addition, the cooling efficiency of the portion corresponding to the central portion of the coil (30) by the oil (Oi) can be improved.

[0127] Oil (Oi) passing through the hole (13c) can be provided to the slot (13b) of the middle core (13) where the coil (30) is located. At this time, the gum (13g) of the middle core (13) forming the inner circumferential surface (13aa) of the middle core (13) can form a part of the oil (Oi) flow path inside the slot (13b). The oil (Oi) can be distributed to the sleeve (211) inserted into the first side core (11) and the sleeve (221) inserted into the second side core (12). At this time, the sleeve (211) can cover the slit (11c) of the first side core (11) to form a part of the oil (Oi) flow path inside the sleeve (211). In addition, the sleeve (221) can cover the slit (12c) of the second side core (12) to form a part of the oil (Oi) flow path inside the sleeve (221). Accordingly, the oil (Oi) introduced into the middle core (13) can flow along the internal spaces (211S, 221S) of the sleeves (211, 221) and cool the core (10).

[0128]

[0129] Referring to FIGS. 25 and 26, oil (Oi) introduced into the oil inlet (3b) can be distributed from the channel (3c) of the housing (3) to the holes (13c) of the middle core (13), and can cool the center of the core (10) and the center of the coil (30) corresponding thereto. Subsequently, the oil (Oi) passing through the holes (13c) can pass through the internal spaces (211S, 221S) of the sleeves (211, 221) and be discharged outside the sleeves (211, 221). The discharged oil (Oi) can also flow to a portion of the coil (30) outside the sleeves (211, 221). That is, the oil (Oi) can directly cool from the center of the coil (30) to both ends (i.e., the first and second end-turn portions (31, 32, see FIG. 14). Accordingly, the coil (30) of the stator (1) can be smoothly cooled, and the performance of the electric motor (M) can be improved. In addition, the structure for cooling the coil (30) of the stator (1) described above is compact, which can be advantageous in reducing the volume of the electric motor (M), and can also be advantageous in reducing the manufacturing cost of the electric motor (M).

[0130] The discharged oil (Oi) may be collected and then supplied back to the oil inlet (3b). The electric motor (M) or a device having the same may be equipped with a means (e.g., a pump) for circulating the oil (Oi). The electric motor (M) or a device having the same may be equipped with a means (e.g., an air-cooled cooling device and / or a water-cooled cooling device) for cooling the discharged oil (Oi).

[0131]

[0132] Referring to FIGS. 1 to 26, in an electric motor (M) having a stator (1) and a rotor (2), the stator (1) includes: a core (10) having a hollow cylinder shape; a core (10) having a slot (10S) formed by penetrating both ends of the core (10) in the axial direction of the core (10); and a coil (30) wound around the slot (10S), wherein the core (10) includes: a first side core (11) forming one end of the core (10) and having a first section (11b) of the slot (10S) formed therein; a second side core (12) forming the other end of the core (10) and having a second section (12b) of the slot (10S) formed therein; A middle core (13) positioned between the first and second side cores (11, 12) and having a third section (13b) of the slot (10S) connecting the first and second sections (12a, 12b) formed therein; and a hole (13c) formed from an outer surface (13ab) of the middle core (13) toward the third section (13b) and providing an oil path.

[0133] The slot (10S) of the core (10) may include a plurality of slots (10S) spaced apart from each other in the circumferential direction of the core (10), and the coil (30) may be one of a plurality of coils (30) wound around the plurality of slots (10S).

[0134] The hole (13c) of the core (10) may include a plurality of holes (13c) spaced apart from each other in the circumferential direction of the core (10), and each of the plurality of holes (13c) may be connected to each of the plurality of slots (10S).

[0135] In the axial direction of the core (10), the length (l3) of the middle core (13) may be shorter than the lengths (l1, l2) of each of the first and second side cores (11, 12).

[0136] The first and second side cores (11, 12) may have the same shape.

[0137] In the axial direction of the core (10), the middle core (13) can form the central portion of the core (10).

[0138] The middle core (13) may include: a first side (13V) facing the first side core (11); a second side (13W) facing the second side core (12); and a rib (13r) protruding from the inner surface of the hole (13c) of the core (10) and positioned between the first side (13V) and the second side (13W).

[0139] The rib (13r) of the middle core (13) may include: a first rib (13ra) adjacent to the first side (13V) of the middle core (13); and a second rib (13rb) adjacent to the second side (13W) of the middle core (13) and arranged to be staggered from the first rib (13ra).

[0140] The first rib (13ra) of the middle core (13) may include: a plurality of first ribs (13ra) spaced apart from each other in the depth direction (DR) of the hole (13c), and the second rib (13rb) of the middle core (13) may include: a plurality of second ribs (13rb) spaced apart from each other in the depth direction (DR) of the hole (13c) and arranged in an alternating manner with the plurality of first ribs (13ra).

[0141] The hole (13c) of the core (10) may include: first holes (13ca) spaced apart from each other in the circumferential direction of the core (10); and second holes (13cb) alternately arranged with the first holes (13ca), and the first and second ribs (13ra, 13rb) of the middle core (13) may be positioned in each of the first holes (13ca), and the rib (13r) of the middle core (13) may include: a third rib (13rc) adjacent to the first side (13V) of the middle core (13) and positioned in each of the second holes (13cb); In addition, the middle core (13) may further include a fourth rib (13rd) adjacent to the second side (13W), arranged alternately with the third rib (13rc), and positioned in each of the second holes (13cb).

[0142] The middle core (13) may be a set of first plates (131) and second plates (132) that are stacked on each other in the axial direction of the core (10), and the first plates (131) may form the first and third ribs (13ra, 13rc) of the middle core (13), and the second plates (132) may have the same shape as the first plates (131), and may be rotated at an angle corresponding to the angle (theta 3) between the first and second holes (13ca, 13cb) with respect to the axial direction of the core (10) to form the second and fourth ribs (13rb, 13rd) of the middle core (13).

[0143] In the axial direction of the core (10), the hole (13c) of the core (10) can penetrate both sides of the middle core (13), and in the axial direction of the core (10), the first and second side cores (11, 12) can block the hole (13c) of the core (10).

[0144] The inner circumference (13aa) of the middle core (13) may form a closed loop, and the third section (13b) of the slot (10S) may be opened toward the hole (13c) of the core (10), and the middle core (13) may include: a gum (13g) forming the inner circumference (13aa) of the middle core (13); teeth (13t) protruding from the gum (13g) and forming the outer circumference (13ab) of the middle core (13), and spaced apart from each other with the slot (10S) and the hole (13c) therebetween; and a rib (13r) connecting the teeth (13t) and positioned in the hole (13c).

[0145] The first side core (11) may include: a first slit (11c) formed on the inner circumferential surface (11aa) of the first side core (11) and directed toward the first section (11b) of the slot (10S), and the second side core (12) may include: a second slit (12c) formed on the inner circumferential surface (12aa) of the second side core (12) and directed toward the second section (12b) of the slot (10S).

[0146] The above electric motor (M) may further include: a first sleeve (211) positioned in the first section (11b) of the slot (10S) and covering the first slit (11c); and a second sleeve (221) positioned in the second section (12b) of the slot (10S) and covering the second slit (12c).

[0147]

[0148] Any or all of the embodiments of the present disclosure described above are not mutually exclusive or distinct. Any or all of the embodiments of the present disclosure described above may have their respective components or functions combined or used together.

[0149] For example, it means that a configuration A described in a particular embodiment and / or drawing can be combined with a configuration B described in another embodiment and / or drawing. That is, even if a combination between configurations is not directly described, it means that a combination is possible, except in cases where a combination is described as impossible.

[0150] The above detailed description should not be construed as limiting in any respect and should be considered illustrative only. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. In an electric motor having a stator and a rotor, The above stator: A core having a hollow cylinder shape; a core having a slot formed by penetrating both ends of the core in the axial direction of the core; and, Contains a coil wound in the above slot, The above cores are: A first side core forming one end of the core and forming a first section of the slot; A second side core forming the other end of the core and forming a second section of the slot; A middle core positioned between the first and second side cores and forming a third section of the slot connecting the first and second sections; and An electric motor including a hole formed from the outer surface of the middle core toward the third section and providing an oil path.

2. In paragraph 1, The above slots of the above core are: It comprises a plurality of slots spaced apart from each other in the circumferential direction of the core, The above coil, An electric motor, one of a plurality of coils wound around the plurality of slots.

3. In paragraph 2, The above hole of the above core: comprising a plurality of holes spaced apart from each other in the circumferential direction of the core; Each of the above plurality of holes, An electric motor connected to each of the above plurality of slots.

4. In paragraph 1, In the axial direction of the core, the length of the middle core is An electric motor having a length shorter than each of the first and second side cores.

5. In paragraph 4, The first and second side cores are an electric motor having the same shape.

6. In paragraph 4, In the axial direction of the above core, the middle core, An electric motor forming the central portion of the above core.

7. In paragraph 1, The above middle core: A first side facing the first side core; a second side facing the second side core; and, An electric motor comprising a rib protruding from the inner surface of the hole of the core and positioned between the first side and the second side.

8. In paragraph 7, The above ribs of the above middle core: a first rib adjacent to the first side of the middle core; and, An electric motor comprising a second rib adjacent to the second side of the middle core and arranged in an alternating manner with the first rib.

9. In paragraph 8, The first rib of the above middle core: comprising a plurality of first ribs spaced apart from each other in the depth direction of the hole, The second rib of the above middle core: An electric motor comprising a plurality of second ribs spaced apart from each other in the depth direction of the hole and arranged in an alternating manner with the plurality of first ribs.

10. In paragraph 8, The above hole of the above core: First holes spaced apart from each other in the circumferential direction of the core; and, including second holes arranged alternately with the first holes, The first and second ribs of the above middle core, Located in each of the above first holes, The above ribs of the above middle core: A third rib adjacent to the first side of the middle core and positioned in each of the second holes; and An electric motor further comprising a fourth rib adjacent to the second side of the middle core, arranged alternately with the third rib, and positioned in each of the second holes.

11. In paragraph 10, The above middle core is, A set of first plates and second plates that are stacked on each other in the axial direction of the core, The above first plates are, Forming the first and third ribs of the middle core, The above second plates are, An electric motor having the same shape as the first plates and rotating at an angle corresponding to the angle between the first and second holes with respect to the axial direction of the core to form the second and fourth ribs of the middle core.

12. In paragraph 1, In the axial direction of the core, the hole of the core, Penetrating both sides of the above middle core, In the axial direction of the core, the first and second side cores, An electric motor that blocks the hole of the above core.

13. In paragraph 12, The inner surface of the above middle core forms a closed loop, The third section of the above slot is open toward the hole of the above core, The above middle core: Gum forming the inner surface of the middle core; Teeth protruding from the above sword, forming the outer surface of the middle core, and spaced apart from each other with the slot and the hole therebetween; and, An electric motor comprising a rib connected to the above teeth and positioned in the hole.

14. In paragraph 1, The above first side core: A first slit formed on the inner surface of the first side core and facing the first section of the slot, The above second side core: An electric motor comprising a second slit formed on the inner surface of the second side core and facing the second section of the slot.

15. In paragraph 14, A first sleeve located in the first section of the slot and covering the first slit; and, An electric motor further comprising a second sleeve positioned in the second section of the slot and covering the second slit.

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