Stator and motor with same

Abstract

In a stator and a motor having the same in an aspect of the present invention, the stator includes: a core provided with a plurality of slots; the plurality of coils are wound on the plurality of grooves, and at least two coils in the plurality of coils have at least one different specification.

Description

Technical Field

[0001] The present invention relates to a stator and a motor having the stator. Background Art

[0002] A vehicle is a device that moves a seated user in a desired direction. Representatively, an automobile can be cited as an example. On the other hand, an electric vehicle that uses electricity as power or a hybrid vehicle that combines them with an internal combustion engine uses a motor and a battery, etc. to generate output.

[0003] Generally, a motor has a stator and a rotor rotatably disposed relative to the stator. The stator is configured to have a core provided with a plurality of slots and coils wound around the core via the plurality of slots.

[0004] In order to improve the efficiency of the motor and reduce copper loss (Joule loss), a motor using a hairpin winding method that increases the filling rate of the stator winding (the ratio of the copper wire area to the area inside the slot) (hereinafter, referred to as a hairpin motor) is used. In order to improve the loss caused by winding resistance, the hairpin motor applies a hairpin winding method that deviates from the existing circular winding method.

[0005] The hairpin motor includes a core in which a plurality of its slots are arranged circumferentially and a plurality of hairpins inserted into the plurality of slots. Each hairpin includes an insertion portion inserted into the inside of different slots from each other.

[0006] The hairpin winding method is a method of inserting a relatively thick square cross-section copper wire into the slot. According to the hairpin winding method, since there is no waste of space between the coils, the filling rate can be maximized, and thus an increase in output due to a reduction in resistance can be expected.

[0007] On the other hand, the coil specifications of the motor are selected in a manner that satisfies the heat resistance level and insulation performance, and the selected coil specifications are applied to the entire coil in the same manner. In order to achieve the light weight and high efficiency of the motor, the applied voltage gradually increases, and accordingly the insulation performance is further strengthened. As a result, the coating material becomes thick and of high specification, which increases the proportion of the processing cost in the winding price. Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] An object of the present invention is to provide a stator and a motor having the stator that can achieve light weight and high efficiency by improving insulation performance.

[0010] An object of the present invention is to provide a stator and a motor having the stator that can reduce the manufacturing cost while satisfying the heat resistance level, insulation performance, etc. in order to ensure the competitiveness of the motor.

[0011] The object of the present invention is not limited to the above object, and those skilled in the art can clearly understand other objects not mentioned from the following description.

[0012] Technical solutions for solving the problem

[0013] In a stator according to one aspect of the present invention and a motor having the stator, the stator includes: a core provided with a plurality of slots; and a plurality of coils wound around the plurality of slots, and at least two of the plurality of coils have at least one different specification.

[0014] The plurality of coils may include a first coil connected to a power supply line and a second coil connected to the first coil.

[0015] The first coil may include a corona-resistant coating, and the second coil may not include a corona-resistant coating.

[0016] The dielectric constant of the first coil may be lower than that of the second coil. Even in this case, the first coil may include a corona-resistant coating, and the second coil may not include a corona-resistant coating.

[0017] The polyether ether ketone (PEEK) of the first coil may be thicker than that of the second coil.

[0018] The first coil may be a wire material applying a polyether ether ketone extrusion specification, and the second coil may be a wire material not applying a polyether ether ketone extrusion specification.

[0019] A hole may be formed axially through the center of the core, and the slots may be arranged on the outer periphery of the hole.

[0020] The power supply line may be connected to the coil arranged at the position farthest from the hole.

[0021] Alternatively, the power supply line may be connected to the coil arranged at the position farthest from the hole and the coil arranged at the position closest to the hole.

[0022] The farther the plurality of coils are from the power supply line, the higher their dielectric constant may be.

[0023] The closer the plurality of coils are to the power supply line, the thicker their coating may be.

[0024] The plurality of coils may include a first turn connected to a power supply line and a second turn to an nth turn connected to the first turn.

[0025] The dielectric constant of the first turn may be lower than that of the nth turn.

[0026] As the number of turns increases from the first turn to the nth turn, the dielectric constant can increase.

[0027] The dielectric constant of the first turn to the xth turn can be lower than that of the (x + 1)th turn to the nth turn.

[0028] The coating thickness of the first turn can be thicker than that of the nth turn.

[0029] Advantages of the Invention

[0030] According to at least one embodiment of the present invention, it is possible to achieve weight reduction and high efficiency of the stator and the motor having the stator.

[0031] According to at least one embodiment of the present invention, in order to ensure the competitiveness of the motor, while meeting the heat resistance level, insulation performance, etc., the manufacturing cost of the stator and the motor having the stator can be reduced.

[0032] On the other hand, various other effects will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention described later. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram showing the body of a vehicle according to an embodiment of the present invention.

[0034] Figure 2 It is an assembled view of a stator according to an embodiment of the present invention.

[0035] Figure 3 It is an exploded perspective view of a stator according to an embodiment of the present invention.

[0036] Figure 4 It is a bottom view of a stator according to an embodiment of the present invention.

[0037] Figure 5 It is a top view of a stator according to an embodiment of the present invention.

[0038] Figure 6 It is along Figure 5 The sectional view taken along the line F - F of

[0039] Figure 7 It is a diagram referred to for the description related to the winding structure of the hairpin motor.

[0040] Figure 8 It is a diagram referred to for the description related to the winding structure of the hairpin motor according to an embodiment of the present invention.

[0041] Figure 9This is a diagram for reference in the description related to the winding structure of the hairpin motor according to an embodiment of the present invention.

[0042] Figure 10 This is a U-phase pattern diagram of the coil according to an embodiment of the present invention. Detailed implementation manners

[0043] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to such embodiments and can be modified in various ways.

[0044] On the other hand, in this specification, terms such as "comprising" or "having" should be understood as being intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof disclosed in the specification, and not intended to preclude the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof in advance.

[0045] In addition, in this specification, when a certain component is described as being "connected", "coupled" or "joined" to another component, it should be understood that the components can be directly connected or coupled to each other, but other components can also be "interposed" between the components, or the components are "connected", "coupled" or "joined" by using other components.

[0046] In addition, in this specification, in order to describe various elements, terms such as first, second, etc. may be used, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0047] Figure 1 This is a schematic diagram showing the body of a vehicle according to an embodiment of the present invention.

[0048] Referring to the accompanying drawings, a vehicle 100 according to an embodiment of the present invention may include a battery 205 that supplies power, a motor drive device 200 that receives power supply from the battery 205, a motor 250 that is driven by the motor drive device 200 and rotates, front wheels 150 and rear wheels 155 that rotate by the motor 250, a front wheel suspension device 160 and a rear wheel suspension device 165 that prevent the vibration of the road surface from being transmitted to the body, and an inclination angle detection unit 190 that detects the inclination angle of the body. On the other hand, a drive gear (not shown) that changes the rotation speed of the motor 250 based on the gear ratio may be additionally provided.

[0049] The inclination angle detection unit 190 detects the inclination angle of the body and inputs the detected inclination angle to an electronic control unit 410 described later. The inclination angle detection unit 190 can be implemented by a gyro sensor or a level sensor, etc.

[0050] On the other hand, although the tilt angle detection unit 190 is shown in the drawings as being disposed on the battery 205, it is not limited thereto, and it may be disposed on the front wheel 150 or the rear wheel 155, or may be disposed on both the front wheel 150 and the rear wheel 155.

[0051] The battery 205 supplies power to the motor drive device 200. In particular, direct current is supplied to the capacitor C in the motor drive device 200.

[0052] Such a battery 205 may be formed by a collection of a plurality of unit cells. In order to maintain a constant voltage, the plurality of unit cells may be managed by a Battery Management System (BMS), and may be discharged at a constant voltage through the battery management system.

[0053] For example, the battery management system may detect the voltage (Vbat) of the battery 205, and may transmit it to an electronic control unit (not shown) or an inverter control unit 250 in the motor drive device 200. In the case where the battery voltage (Vbat) drops below the lower limit value, the direct current stored in the capacitor C in the motor drive device 200 may be supplied to the battery. Additionally, in the case where the battery voltage (Vbat) rises above the upper limit value, direct current may also be supplied to the capacitor C in the motor drive device 200.

[0054] The battery 205 is preferably composed of a rechargeable secondary battery, but is not limited thereto.

[0055] The motor drive device 200 receives direct current from the battery 205 through the power input cable 120. The motor drive device 200 converts the direct current received from the battery 205 into alternating current and supplies it to the motor 250. The converted alternating current may be three-phase alternating current. The motor drive device 200 may supply three-phase alternating current to the motor 250 through the three-phase output cable 125 provided in the motor drive device 200.

[0056] Although Figure 1 the motor drive device 200 is shown with a three-phase output cable 125 composed of three cables, three cables may be provided within a single cable.

[0057] The motor 250 includes a stator 130 that does not rotate and is fixed, and a rotor 135 that rotates. The motor 250 may be provided with an input cable 140 to receive the alternating current supplied from the motor drive device 200.

[0058] For example, the motor 250 may be a three-phase motor. In the case where alternating current of variable voltage / variable frequency is applied to the coils of the stator of each phase, the rotational speed of the rotor will be variable based on the applied frequency.

[0059] The motor 250 can be implemented in various forms such as an induction motor, a brushless DC motor (BLDC), and a reluctance motor.

[0060] On the other hand, a drive gear (not shown) can be provided on one side of the motor 250. The drive gear converts the rotational energy of the motor 250 based on a gear ratio. The rotational energy output from the drive gear is transmitted to the front wheel 150 and / or the rear wheel 155 to move the vehicle 100.

[0061] The front wheel suspension device 160 and the rear wheel suspension device 165 support the front wheel 150 and the rear wheel 155 relative to the vehicle body respectively. The up-and-down directions of the front wheel suspension device 160 and the rear wheel suspension device 165 are supported by springs or damping mechanisms to prevent road surface vibrations from being transmitted to the vehicle body.

[0062] A steering device (not shown) can also be provided on the front wheel 150. The steering device is a device that adjusts the direction of the front wheel 150 so that the vehicle 100 travels in the direction desired by the driver.

[0063] On the other hand, although not shown in the drawings, the vehicle 100 may further include an electronic control unit (Electronic Controller) for controlling the electronic devices of the vehicle as a whole. The electronic control unit (not shown) controls each device to enable operations, displays, etc. In addition, the above-mentioned battery management system can also be controlled.

[0064] In addition, the electronic control unit (not shown) can generate driving command values according to various driving modes (such as driving mode, reverse mode, neutral mode, and parking mode) based on detection signals from an inclination angle detection unit (not shown) that detects the inclination angle of the vehicle 100, a speed detection unit (not shown) that detects the speed of the vehicle 100, a braking detection unit (not shown) according to the operation of the brake pedal, an acceleration detection unit (not shown) according to the operation of the acceleration pedal, etc. The driving command value at this time can be, for example, a torque command value or a torque command value.

[0065] On the other hand, the vehicle 100 according to an embodiment of the present invention can be a concept including a pure electric vehicle using a battery and a motor and a hybrid electric vehicle using an engine and using a battery and a motor at the same time.

[0066] At this time, the hybrid electric vehicle may further have a switching mechanism and a transmission that can select at least one of the battery and the engine.

[0067] On the other hand, hybrid electric vehicles can be divided into a series type that converts mechanical energy output from the engine into electrical energy to drive the motor, a parallel type that uses both the mechanical energy output from the engine and the electrical energy from the battery, and a series-parallel type that combines the two.

[0068] Figure 2 is an assembled view of the stator according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the stator according to an embodiment of the present invention.

[0069] Figure 4 is a bottom view of the stator according to an embodiment of the present invention, Figure 5 is a top view of the stator according to an embodiment of the present invention. Figure 6 is along Figure 5 a sectional view taken along line F-F of

[0070] Referring to Figures 2 to 6 , the stator 300 includes a core 310 disposed in a plurality of slots 311 and a plurality of coils 330 wound around the plurality of slots 311.

[0071] The core 310 can function as a flux transmission path and is generally formed by laminating electrical steel sheets of a film.

[0072] A plurality of slots 311 can be arranged circumferentially on the core 310. The stator 300 can be configured such that a rotor (not shown) can be rotatably accommodated therein with a preset air gap therebetween.

[0073] A hole 340 penetrating axially can be formed in the central portion of the core 310. The hole 340 can be a rotor accommodation hole such that the rotor can be rotatably accommodated in the rotor accommodation hole. The slots 311 can be disposed on the outer peripheral edge of the hole 340. A plurality of slots 311 can be alternately formed on the periphery of the hole 340.

[0074] In a double parallel winding structure in which power is supplied to the outside, the power supply line can be connected to the coil 330 of the outer layer disposed at the position farthest from the hole 340. In a parallel winding structure in which power is supplied to the inner side / outer side respectively, the power supply line can be connected to the coil 330 of the outer layer disposed at the position farthest from the hole 340 and the coil 330 of the inner layer disposed at the position closest to the hole 340.

[0075] The coil 330 can be wound through a plurality of slots 311. The coil 330 can include a plurality of hairpins inserted into the plurality of slots 311. The plurality of hairpins can be connected in series with each other.

[0076] The coil 330 (a plurality of hairpins) can be configured to be connectable to a high voltage. Each hairpin can include a conductor and a coating material (coating film) coated on the surface of the conductor. The hairpin can include two insertion portions axially inserted into the inside of the groove 311 from one side of the core 310 along the axial direction and a connection portion connecting the two insertion portions. The hairpin can be formed by bending a conductor having a rectangular cross-section into a substantially "U" shape.

[0077] The insertion portions of a plurality of hairpins are respectively received inside a plurality of grooves 311. For example, the groove 311 can be formed to have a width corresponding to the cross-sectional shape of the hairpin 210. The groove 311 can be configured to have a width corresponding to the circumferential width in the cross-section of the hairpin 210. A plurality of layers can be formed inside the plurality of grooves 311 by the respective insertion portions of the plurality of hairpins.

[0078] The coil 330 can include a plurality of phase coils (U-phase coil, V-phase coil, and W-phase coil). The plurality of phase coils can include a plurality of coils connected in parallel to each other. For example, the plurality of phase coils can include two U-phase coils U1, U2, two V-phase coils V1, V2, and two W-phase coils W1, W2.

[0079] The power connection terminals of the connection ring 350 can be respectively connected to the plurality of phase coils to supply power. The connection ring 350 is a structure formed by a conductor that connects the power supplied from the outside to the coil 330 and connects the neutral points of the three phases.

[0080] On the other hand, an insulator 320 for ensuring insulation can be disposed between the core 310 and the coil 330. For example, the insulator 320 can be formed of aramid paper, aramid and plastic film lamination, plastic film, etc.

[0081] At least two of the plurality of coils 330, namely 330a and 330b, have at least one different specification.

[0082] The plurality of coils 330 can include a first coil 330a and a second coil 330b. The first coil 330a and the second coil 330b can respectively include a plurality of hairpins.

[0083] The first coil 330a can be a wire having a relatively low dielectric constant, satisfying the insulation performance of the supplied voltage, or can be a wire having an anti-corona coating, or can be a wire (WIRE) extruded from polyetheretherketone (PEEK).

[0084] The second coil 330b may be a wire having a relatively high dielectric constant compared to the first coil 330a, or may be a wire from which the corona prevention coating has been removed.

[0085] As the coil 330 with relatively high specifications among the coils 330, the first coil 330a may also be named HighClass Wire. As the coil 330 with relatively low specifications among the coils 330, the second coil 330b may also be named Low Class Wire.

[0086] The first coil 330a may be connected to a power supply line that supplies power to the coil 330, and the second coil 330b may be connected to the first coil 330a. Therefore, current flows in the order of the first coil 330a and the second coil 330b.

[0087] In the prior art, while selecting the coil specifications of the motor in a manner that satisfies the heat resistance level and insulation performance, the selected specifications are applied identically to the entire coil.

[0088] In order to achieve the light weight and high efficiency of the motor, the applied voltage gradually increases. As the applied voltage increases, the insulation performance also needs to be further strengthened. Therefore, while the coating material of the coil 330 becomes thicker and of higher specifications, the proportion of the manufacturing cost and the in - processing cost in the price increases.

[0089] The voltage distribution within the motor coil concentrates towards the center of the power supply line. There is a voltage drop in the winding, and the voltage is the highest at the beginning, but gradually decreases as the number of turns increases. Therefore, if the insulation of adjacent parts of the power supply line is ensured, the insulation performance required for the motor can be satisfied.

[0090] The dielectric constant of the first coil 330a connected to the power supply line first may be lower than that of the second coil 330b.

[0091] The first coil 330a may include a corona prevention coating, and the second coil 330b may not include a corona prevention coating. Or, both the first coil 330a and the second coil 330b may include a corona prevention coating, and the corona prevention coating of the first coil 330a may be thicker than that of the second coil 330b.

[0092] In a high - voltage environment, in the case of no corona prevention coating or insufficient corona prevention coating, due to the corona phenomenon where the electric field concentrates on the weak part, partial discharge may occur. Therefore, the first coil 330a can be used for the coil 330 closer to the power supply line to which high voltage is applied, and the second coil 330b can be used for the coil 330 farther from the power supply line and with a lower voltage.

[0093] The dielectric constant of the first coil 330a can be lower than that of the second coil 330b, and it can include an anti-corona coating. Compared with the second coil 330b, at the same winding thickness, the dielectric constant of the first coil 330a can be lower or the thin film layer can be thicker.

[0094] The first coil 330a can be a wire including polyetheretherketone (PEEK) that is thicker than the second coil 330b. Polyetheretherketone (PEEK) has the advantage of excellent electrical properties even at high temperatures.

[0095] Alternatively, polyetheretherketone (PEEK) can be injection-molded or extrusion-molded, which also has advantages in terms of production processes. The first coil 330a can be a wire using the extrusion specification of polyetheretherketone, and the second coil 330b can be a wire that does not use the extrusion specification of polyetheretherketone.

[0096] According to an embodiment of the present invention, the first coil 330a with high-specification insulation measures is used in the adjacent layer of the power supply line, which is the main weak part of the insulation performance, and the second coil 330b with a slightly lower specification is used in other layers.

[0097] In the prior art, a single type (specification) was used for the winding of the motor, but in the present invention, a plurality of types can be used to form the winding of the motor. By using different coils, it is possible to meet the insulation performance above the same level as the prior art, and compared with the prior art, the winding processing cost can be reduced, thereby ensuring the price competitiveness of the motor.

[0098] In addition, a high-specification first coil 330a can be used for the winding closer to the power supply unit (power supply terminals and / or power supply lines, etc.).

[0099] For the winding closer to the power supply unit, a winding with a lower dielectric constant, a winding coated with anti-corona, or a polyetheretherketone (PEEK) extrusion-shaped winding can be used.

[0100] A high-specification first coil 330a can be used in the adjacent layer of the power supply unit (power supply terminals and / or power supply lines, etc.), so as to meet the same heat resistance level, insulation performance, etc., and reduce the material cost and process cost.

[0101] In addition, the dielectric constant of the plurality of coils 330 can be higher the farther away from the power source such as the power supply line. In addition, the coating of the plurality of coils 330 can be thicker the closer to the power source such as the power supply line. The farther away from the power source, windings with a gradually increasing dielectric constant can be arranged, and the closer to the power source, windings with a gradually decreasing dielectric constant can be arranged. When the power source is connected on the outside, windings with an increasing dielectric constant can be selected in the direction from the outside to the inside according to the arrangement of the slots 311.

[0102] At least two of the plurality of coils 330, namely 330a and 330b, have at least one different specification. For example, the stator 300 can include different types of coils with different specifications for the coating of the insulator which is a square enameled winding.

[0103] Considering the potential distribution, the composition of the different types of coils can be configured differently. The configuration method is that in the hairpin layer adjacent to the power supply line, windings with a relatively low dielectric constant can be arranged, or square enameled windings with an anti-corona layer resistant to partial discharge can be arranged, or windings with a relatively thick extrusion of polyether ether ketone (PEEK) can be arranged. In other hairpin layers, windings with a relatively high dielectric constant can be arranged, or enameled windings without an anti-corona layer can be arranged, or windings with a thin extrusion of polyether ether ketone (PEEK) can be arranged.

[0104] Even when using different types of coils, it is possible to maintain the same insulation performance as that of a hairpin motor using the same type of coils in the prior art, and it is possible to reduce the processing cost of the square winding.

[0105] Figure 7 It is a figure referred to in the description related to the winding structure of the hairpin motor. Figure 8 It is a figure referred to in the description related to the winding structure of the hairpin motor according to an embodiment of the present invention, showing a double parallel winding structure with power applied to the outside. Figure 9 It is a figure referred to in the description related to the winding structure of the hairpin motor according to an embodiment of the present invention, showing a parallel winding structure with power applied to the inside / outside respectively. Figure 8 and Figure 9 Each includes an enlarged view to see the hairpin.

[0106] Referring to Figure 7 , the motor coil 330 can include three-phase coils 331, 332, and 333, and each phase coil 331, 332, and 333 can include an input / output (in / out) pair for power to enter and exit.

[0107] In the prior art, the motor coil 330 is selected to meet the required enamel coating specifications such as heat resistance level and insulation performance, and the same specification is used as a whole.

[0108] However, according to the present invention, considering the weak insulation parts in the motor coil 300, high-specification winding wires can be used for the weak insulation parts, and relatively low-specification winding wires can be used for the remaining parts. Analyzing the potential distribution, the following coils are applied. That is, since the adjacent layers of the power supply wires are weak insulation parts, winding wires with enamel coating / PEEK extrusion specifications that meet the insulation performance are used in the adjacent layers of the power supply wires, and enamel coating specifications with relatively low insulation performance are used in other layers.

[0109] Figure 8 A double-parallel winding structure with power supplied to the outside is shown. The power supply wire can be connected to the first coil 330a in the outermost layer arranged at the position farthest from the hole 340.

[0110] The first coil 330a is used in the outermost layer, and the second coil 330b is used in the innermost layer. The first coil 330a is a winding wire with a coating specification that meets the insulation performance, has a relatively low dielectric constant, or may have a layer resistant to partial discharge. The second coil 330b has a relatively high dielectric constant, or the layer resistant to partial discharge can be removed.

[0111] Figure 9 A parallel winding structure with power supplied to the inside / outside respectively is shown. The power supply wire can be connected to the first coil 330a in the outermost layer arranged at the position farthest from the hole 340 and the first coil 330a in the innermost layer arranged at the position closest to the hole 340.

[0112] The first coil 330a is used in the innermost layer and the outermost layer where power is applied, and the second coil 330b is used between the first coils 330a on the inside and the outside.

[0113] In terms of the motor assembly, it can be configured to use different types of insulation coatings (enamel / PEEK) for each layer (Layer), so that each layer can have different insulation characteristics and dielectric constants.

[0114] The plurality of coils 330 may include a plurality of turns. The coil 330 may be composed of the first turn to the nth turn (n is a natural number of 2 or more). Here, the first turn is connected to the power supply wire during the winding operation of the coil 330, and refers to the first turn that passes through the slot 311 from the power supply wire. The second turn may be the next turn after the first turn. The coil 330 may include the first turn connected to the power supply wire and the second turn to the nth turn connected to the first turn. The first turn to the nth turn may be connected in series, and the current flows in this order.

[0115] The dielectric constant of the first turn may be lower than that of the nth turn.

[0116] According to the embodiment, the dielectric constant may be configured to change gradually. For example, as the number of turns increases from the first turn to the nth turn, its dielectric constant increases.

[0117] On the other hand, the dielectric constant of the group formed by winding coils with a specified number of turns and adjacent to the power supply unit can be higher than that of other groups. For example, the dielectric constant of the first turn to the x-th turn can be lower than that of the (x + 1)-th turn to the n-th turn. Here, x can be a natural number greater than 1 and less than n.

[0118] On the other hand, the coating thickness of the first turn can be thicker than that of the n-th turn.

[0119] Figure 10 It is a wiring diagram of a wire in an embodiment of the present invention, showing a U-phase pattern diagram of a coil.

[0120] Figure 10 It shows a pattern diagram of U1 and U2 in the U-phase in a double-parallel structure with 48 slots.

[0121] In Figure 10 , the HIGH CLASS WIRE can be the relatively high-specification first coil 330a, and the LOW CLASS WIRE can be the relatively low-specification second coil 330b. In Figure 10 , the dotted line is the return path. When U+ is defined as the positive direction, U- is the opposite direction of U+, i.e., the reverse direction. Slots such as 3, 4, 5, and 6 Figure 10 The slots not shown in can be configured in the same way in the patterns of other phases V and W. The wound wire can be connected by welding.

[0122] Referring to Figure 10 , since power is applied outward, the HIGH CLASS WIRE is arranged in the outer 7th and 8th layers close to the power supply unit where the power is applied, and the LOW CLASS WIRE is arranged in the remaining 1st to 6th layers.

[0123] Power flows into the 1st slot and is applied to the 7th slot. Power flows into the 7th slot and flows to the 13th slot. In the same way, power is applied in the order of the 13th slot, 19th slot, and 25th slot.

[0124] U+ and U- are paired as one turn. The 1st - 7th slots can form one turn, the 13th - 19th slots can form one turn, the 25th - 31st slots can form one turn, and the 37th - 43rd slots can form one turn. In Figure 10 's example, the HIGH CLASS WIRE is used for the first to fourth turns among the first to nth turns. Thus, the HIGH CLASS WIRE is used in the 7th and 8th layers.

[0125] Within the same slot, the dielectric constant of at least one layer can be different from that of the remaining layers. According to an embodiment, within the same layer, the dielectric constant of at least one slot can be different from that of the remaining slots.

[0126] According to an embodiment of the present invention, the coating specifications of the insulator of the square enameled wire winding can be used differently. At this time, considering the potential distribution, the configurations of different coils can be arranged differently. The configuration method is that in the hairpin layer adjacent to the power supply line, windings with a relatively low dielectric constant can be arranged, or square enameled wire windings with an anti-corona layer with resistance to partial discharge can be arranged. In other hairpin layers, windings with a relatively high dielectric constant can be arranged, or enameled wire windings without an anti-corona layer can be arranged.

[0127] If the dielectric constant is low, the occurrence of discharge can be effectively prevented. Even in the case of discharge, the anti-corona layer has a defensive effect. High-specification first coils 330a can be used in the windings adjacent to the power supply unit to which a high voltage is applied, so that insulation performance can be ensured at low cost.

[0128] As mentioned above, although the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the above specific embodiments. Without departing from the gist of the present invention claimed in the claims, those of ordinary skill in the art to which the present invention pertains can make various modifications, and these modifications should not be understood separately without departing from the technical idea or prospect of the present invention.

Claims

1. A stator, wherein, Comprising: A core provided with a plurality of slots; And A plurality of coils wound around the plurality of slots; At least two of the plurality of coils have at least one different specification.

2. The stator according to claim 1, wherein The plurality of coils include a first coil connected to a power supply line and a second coil connected to the first coil.

3. The stator according to claim 2, wherein The dielectric constant of the first coil is lower than that of the second coil.

4. The stator according to claim 3, wherein The first coil includes a corona-resistant coating, The second coil does not include a corona-resistant coating.

5. The stator according to claim 2, wherein The polyether ether ketone of the first coil is thicker than that of the second coil.

6. The stator according to claim 2, wherein The first coil is a wire material applying the extrusion specification of polyether ether ketone, The second coil is a wire material not applying the extrusion specification of polyether ether ketone.

7. The stator according to claim 2, wherein The first coil includes a corona-resistant coating, The second coil does not include a corona-resistant coating.

8. The stator according to claim 2, wherein A hole is axially formed through the center of the core, The slots are arranged on the outer periphery of the hole, The power supply line is connected to the coil arranged at the position farthest from the hole.

9. The stator according to claim 2, wherein The power supply line is connected to the coil arranged at the position farthest from the hole and the coil arranged at the position closest to the hole.

10. The stator according to claim 1, wherein The farther the plurality of coils are from the power supply line, the higher their dielectric constant.

11. The stator according to claim 1, wherein The closer the plurality of coils are to the power supply line, the thicker their coating.

12. The stator according to claim 1, wherein The plurality of coils include a first turn connected to a power supply line and a second turn to an nth turn connected to the first turn.

13. The stator according to claim 12, wherein The dielectric constant of the first turn is lower than that of the nth turn.

14. The stator according to claim 12, wherein As the number of turns increases from the first turn to the nth turn, its dielectric constant increases.

15. The stator according to claim 12, wherein The dielectric constant of the first turn to the xth turn is lower than that of the (x + 1)th turn to the nth turn.

16. The stator according to claim 12, wherein The coating thickness of the first turn is thicker than that of the nth turn.

17. A motor, wherein It has the stator according to any one of claims 1 to 16.

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