Motor for vehicle

Abstract

A motor for a vehicle according to the present invention comprises: a shaft provided to be rotatable; a rotor fixed to the shaft; and a stator around which a coil is wound and which is disposed around the rotor. The stator comprises: a stator core in which a plurality of core sheets are stacked; and an insulator disposed for insulation between the stator core and the coil. The stator core comprises: a plurality of yokes coupled along the circumferential direction; and a tooth extending from each of the yokes toward the rotor. The insulator may comprise a first insulator and a second insulator coupled along the circumferential direction of the tooth.

Description

Vehicle motor

[0001] The present invention relates to a motor for a vehicle.

[0002] A motor is a device that converts electrical energy into mechanical energy to generate rotational force, and it is widely used in vehicles, household electronics, industrial equipment, and more.

[0003] The motor may include a housing, a shaft, a stator disposed inside the housing, and a rotor installed on the outer surface of the shaft. Here, the stator induces the rotation of the rotor by causing electromagnetic interaction with the rotor. Additionally, the shaft rotates together with the rotor due to the rotation of the rotor.

[0004] Motors are used in various devices within a vehicle, such as the power train, steering system, brake system, and suspension system. For example, a vehicle motor may be used as an Electronic Power Steering System (EPS) to ensure steering stability. Alternatively, a motor may be used in a clutch actuator. A vehicle's transmission, which is operated manually based on the driver's clutch operation or automatically based on speed via a transmission, may be configured to include a motor.

[0005] The stator core of a vehicle motor can be manufactured with structures such as a solid core or a laminated core. A solid core is a stator core machined from a single block of steel material; while it has the advantages of good strength and durability, it has the disadvantages of high eddy current losses, the need for high-precision machining, and inconvenient coil winding. In contrast, a laminated core is a stator core made by stacking dozens or more sheets of electrical steel; it is widely used because it has the advantages of high electrical efficiency and easy thermal management, as it minimizes eddy current losses.

[0006] Laminated cores require the process of stacking multiple core sheets and binding them together to prevent separation, and for this purpose, they are bound using caulking such as flat type or V type. However, during caulking, problems such as insulation breakdown between core sheets or deformation of the core sheets occur, which increases eddy losses and consequently increases the friction torque of the motor.

[0007] The technical problem that the present invention aims to solve is to effectively prevent a plurality of core sheets constituting a stacked stator core from detaching when manufacturing a stator core included in a vehicle motor.

[0008] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0009] A vehicle motor according to one embodiment of the present invention comprises a shaft rotatably provided, a rotor fixed to the shaft, and a stator on which a coil is wound and disposed around the rotor, wherein the stator comprises a stator core having a plurality of core sheets stacked thereon and an insulator disposed for insulation between the stator core and the coil, wherein the stator core comprises a plurality of yokes coupled along the circumferential direction and a tooth extending toward the rotor from each of the yokes, and the insulator may comprise a first insulator and a second insulator coupled along the circumferential direction of the tooth.

[0010] In one or more embodiments, the first insulator and the second insulator may expose the outer surface and circumferential alignment portion of the yoke and the inner surface of the tooth.

[0011] In one or more embodiments, the first insulator and the second insulator may wrap around the entire coil winding portion of the tooth.

[0012] In one or more embodiments, the first insulator and the second insulator may have a winding guide groove connected in a single line.

[0013] In one or more embodiments, the first insulator and the second insulator may be joined by a connection between a projection provided on one side and a groove provided on the other side.

[0014] In one or more embodiments, the first insulator and the second insulator may be joined by bonding or fusion.

[0015] In one or more embodiments, the first insulator and the second insulator may each wrap a portion of the yoke of the stator core and the coil winding portion of the tooth by dividing them in half.

[0016] The vehicle motor of the present invention can support the stator core by having the first insulator and the second insulator surround it, so that the process or work for preventing the detachment of the stacked core sheet can be omitted or simplified.

[0017] Accordingly, problems such as damage to the insulation between core sheets, deformation of the core sheets, and increased eddy loss / friction torque can be reduced or prevented, and as a result, the performance of the vehicle motor can be improved.

[0018] Figure 1 is a cross-sectional view illustrating an example of a vehicle motor.

[0019] FIG. 2 is a perspective view of a stator core according to an embodiment of the present invention.

[0020] Figure 3 is an exploded perspective view of the stator core of Figure 2.

[0021] FIG. 4 is a perspective view of the first and second insulators coupled together.

[0022] Figure 5 is a side view of the stator core of Figure 2.

[0023] Figure 6 is a plan view of the stator core of Figure 2.

[0024] Figure 7 is a bottom view of the stator core of Figure 2.

[0025] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0026] "And / or" includes each of the mentioned items and all combinations of one or more.

[0027] The terms used herein are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprising" and / or "comprising" does not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0028] Furthermore, throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly" or "electrically connected" with other members or elements in between.

[0029] Additionally, throughout the specification, the description that each layer (film), region, pattern, or structure is formed "on" or "under" the substrate, each layer (film), region, pad, or pattern includes both direct formation and formation through another layer. The criteria for "on" or "under" each layer are described based on the drawings.

[0030] Furthermore, expressions such as 'first, second,' etc., are used solely to distinguish multiple compositions and do not limit the order or other characteristics between the compositions.

[0031] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0032] FIG. 1 is a cross-sectional view illustrating an example of a vehicle motor (10).

[0033] A typical vehicle motor (10) may include a housing (2), a shaft (3), a stator (4) disposed inside the housing (2), and a rotor (5) installed on the outer surface of the shaft (3). The shaft (3) is provided to be rotatable relative to the housing (2), and the stator (4) is disposed around the rotor (5) fixed to the shaft (3). A coil (6) is wound on the stator (4), and a magnetic material such as a permanent magnet (7) may be provided on the rotor (5). Accordingly, when power is supplied to the coil (4) of the stator (4), the stator (4) induces electromagnetic interaction with the rotor (5), thereby inducing rotation of the rotor (5). Then, the shaft (3) also rotates together with the rotation of the rotor (5).

[0034] FIG. 2 is a perspective view of a stator core (100) of a vehicle motor (10) according to one embodiment of the present invention, and FIG. 3 is an exploded perspective view of the stator core (100) of the vehicle motor (10) of FIG. 2.

[0035] Referring to FIGS. 2 and FIGS. 3, a vehicle motor (10) includes a stator core (100) that acts as an iron core to strengthen a magnetic field, and an insulator (200) for maintaining insulation between a coil (see FIG. 1) wound to form an electromagnetic field and the stator core (100). In particular, the stator core (100) provided by the present invention corresponds to a structure in which a plurality of core sheets are stacked, i.e., a stacked stator core (100), and can be applied to a vehicle motor for, for example, an electric power steering (EPS).

[0036] The illustrated stator core (100) corresponds to a divided stator core. The stator core (100) of FIG. 2 is completed as a single stator (4) by mounting a plurality of them in a circular arrangement along the circumferential surface of a cylindrical housing (2) (see FIG. 1).

[0037] The stator core (100) has a plurality of core sheets stacked along one direction. Looking at the overall structure of the vehicle motor (10), the direction in which the plurality of core sheets are stacked corresponds to a direction parallel to the axial direction of the shaft (3), which is perpendicular to the radial direction (RD) and circumferential direction (CD) of the stator. Here, it is not necessary for the stator core (100) to undergo a caulking process to prevent the plurality of core sheets from detaching by applying pressure.

[0038] The stator core (100) provided by the present invention comprises a first insulator (210) and a second insulator (220) that are coupled to each other as an insulator (200). The first insulator (210) and the second insulator (220) wrap around a portion of the yoke (110) of the stator core (100) and the coil winding portion (122) of the tooth (120). Here, the first insulator (210) and the second insulator (220) are coupled along a circumferential direction (CD) that is orthogonal to the axial direction of a shaft (3) in which a plurality of core sheets are stacked.

[0039] Referring to FIGS. 2 and 3, a plurality of core sheets are stacked along the height direction (axial direction of the shaft) based on the direction shown in the drawings. Accordingly, the first insulator (210) and the second insulator (220) partially wrap the stator core (100) while being coupled together along the circumferential direction (CD), which is orthogonal to the stacking direction of the core sheets. Due to the coupling of the first insulator (210) and the second insulator (220), the movement of the core sheets is restricted in the stacking direction. That is, the detachment of the core sheets can be suppressed by a structure in which the first insulator (210) and the second insulator (220) are coupled together to partially wrap the stator core (100).

[0040] It may be desirable for the first insulator (210) and the second insulator (220) to cover the stator core (100) over a large area so that insulation between the stator core (100) and the coil (6) can be reliably achieved. With this in mind, the first insulator (210) and the second insulator (220) can cover the stator core (100) as widely as possible, to the extent that the outer surface of the yoke (110) and the inner surface of the tooth (120), which form the path of the electromagnetic field in the stator core (100), are exposed. Additionally, since the illustrated stator core (100) corresponds to a divided stator core, the first insulator (210) and the second insulator (220) can expose a circumferential alignment portion (112) provided in a complementary shape on both sides of the circumferential direction (CD) of the yoke (110).

[0041] Additionally, the first insulator (210) and the second insulator (220) can wrap around the entire coil winding portion (122) of the tooth (120) extending radially (RD) from the stator core (100). The coil winding portion (122) of the stator core (100) can be flat for smooth coil winding.

[0042] And, as illustrated in FIG. 3, the first insulator (210) and the second insulator (220) can be joined together by a connection between a protrusion (222) provided on one side and a groove (224) provided on the other side. Due to the structure of the protrusion (222) and the groove (224), the first insulator (210) and the second insulator (220) can be joined in a precisely aligned state. The first insulator (210) and the second insulator (220) can be fixedly joined by means such as adhesion or fusion, and in this case, the structure of the protrusion (222) and the groove (224) can be used in combination for accurate adhesion / fusion.

[0043] FIG. 4 is a perspective view of a first insulator (210) and a second insulator (220) that are coupled together. As clearly shown in FIG. 4, the first insulator (210) and the second insulator (220) may be provided with a single continuous winding guide groove (230). That is, a plurality of disconnected grooves are formed on the surfaces of the first insulator (210) and the second insulator (220), respectively. When the first insulator (210) and the second insulator (220) are coupled in the circumferential direction (CD), the grooves on both sides are connected, and a single continuous spiral winding guide groove (230) is formed. Through the single continuous winding guide groove (230), the winding operation of the coil for the stator core (100) can be carried out smoothly.

[0044] FIG. 5 is a side view of the stator core (100) of FIG. 2, FIG. 6 is a top view of the stator core (100) of FIG. 2, and FIG. 7 is a bottom view of the stator core (100) of FIG. 2.

[0045] The first insulator (210) and the second insulator (220) can each wrap half of a portion of the yoke (110) of the stator core (100) and half of the coil winding portion (122) of the tooth (120). Accordingly, the first insulator (210) and the second insulator (220) can have almost the same size and shape. Since the first insulator (210) and the second insulator (220) have similar structures and sizes, it may be advantageous to manufacture the stator core (100) using an automated process.

[0046] Although the present invention has been described above, those skilled in the art will recognize that the invention may be implemented in other forms while maintaining the technical concept and essential features of the invention.

[0047] The scope of the present invention shall be defined by the claims, but all modifications or variations derived from configurations directly derived from the descriptions in the claims, as well as configurations equivalent thereto, shall be interpreted as being included within the scope of the present invention.

Claims

1. A shaft provided to be rotatable; A rotor fixed to the shaft above; and A stator positioned around the rotor, with coils wound around it; Includes, The above stator comprises a stator core in which a plurality of core sheets are stacked, and an insulator disposed for insulation between the stator core and the coil. The stator core comprises a plurality of yokes coupled along the circumferential direction and a tooth extending toward the rotor from each of the yokes. The above insulator comprises a first insulator and a second insulator coupled along the circumferential direction of the tooth, for a vehicle motor.

2. In Paragraph 1, The above-mentioned first insulator and second insulator are, A vehicle motor that exposes the outer surface and circumferential alignment portion of the yoke and the inner surface of the tooth.

3. In Paragraph 2, The above-mentioned first insulator and second insulator are, A vehicle motor that encloses the entire coil winding portion of the above-mentioned tooth.

4. In Paragraph 3, The above-mentioned first insulator and second insulator are, A vehicle motor equipped with a single continuous winding guide groove.

5. In Paragraph 1, The above-mentioned first insulator and second insulator are, A vehicle motor joined by a connection between a projection provided on one side and a groove provided on the other side.

6. In Paragraph 1 or 5, The above-mentioned first insulator and second insulator are, Vehicle motors joined by bonding or fusion.

7. In Paragraph 1, The above-mentioned first insulator and second insulator are, A vehicle motor that wraps a portion of the yoke of the stator core and a coil winding portion of the tooth, each divided in half.

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