Stator and motor comprising same

Abstract

The present disclosure relates to a stator and a motor comprising same. The stator according to an embodiment of the present disclosure comprises: a stator core having a plurality of slots; and a plurality of windings disposed between the inner periphery and the outer periphery of the stator core, wherein a first winding corresponding to a first phase from among the plurality of windings is disposed over a plurality of layers between the outer periphery and the inner periphery of the stator core, the thickness of a second layer adjacent to the inner periphery is smaller than the thickness of a first layer adjacent to the outer periphery from among the plurality of layers, the plurality of windings are connected in series in a first region between the outer periphery and the inner periphery of the stator core and are connected in parallel in a second region closer to the inner periphery than the first region between the outer periphery and the inner periphery, and the first winding includes a first hairpin that is disposed in the first region and a second hairpin that is disposed in the second region and is longer than the first hairpin. Therefore, heat generation during motor rotation can be reduced while the number of welding members is reduced.

Description

Stator and motor having the same

[0001] The present disclosure relates to a stator and a motor having the same, and more particularly, to a stator and a motor having the same that can reduce heat generation during motor rotation while reducing the number of welded members.

[0002] Electric vehicles that run on electricity, or hybrid vehicles that combine internal combustion engines and these, generate their output using motors and batteries.

[0003] Meanwhile, for vehicle motors, circular motors and hairpin motors are being developed.

[0004] In particular, when using a hairpin motor for heat control, there is a disadvantage in that heat generation becomes more severe as it goes further into the motor's stator during high-speed rotation.

[0005] The technical problem of the present disclosure is to provide a stator capable of reducing heat generation during motor rotation while reducing the number of welding parts, and a motor having the stator.

[0006] The technical problem of the present disclosure is to provide a stator capable of reducing heat generation near the inner periphery of a stator core while reducing the number of welding members, and a motor having the same.

[0007] Another technical challenge of the present disclosure is to provide a stator capable of reducing heat generation by reducing AC (Alternating Current) resistance during motor rotation, and a motor having the stator.

[0008] Another technical challenge of the present disclosure is to provide a stator capable of reducing heat generation during motor rotation based on asymmetric winding and a motor having the stator.

[0009] A stator and a motor including the same according to an embodiment of the present disclosure for solving the above technical problem include a stator core having a plurality of slots formed therein, and a plurality of windings arranged between an inner periphery and an outer periphery of the stator core, wherein a first winding corresponding to a first phase among the plurality of windings is arranged across a plurality of layers between the outer periphery and the inner periphery of the stator core, and a thickness of a second layer adjacent to the inner periphery among the plurality of layers is smaller than a thickness of a first layer adjacent to the outer periphery, and is connected in series in a first region between the outer periphery and the inner periphery of the stator core, and is connected in parallel in a second region closer to the inner periphery than the first region between the outer periphery and the inner periphery, and the first winding includes a first hairpin arranged in the first region, and a second hairpin arranged in the second region and having a longer length than the first hairpin.

[0010] Meanwhile, the first winding may further include a first connecting member connected to a first hairpin within the first region, and a second connecting member connected to a second hairpin within the second region.

[0011] Meanwhile, it is preferable that the number of second connecting members be less than the number of first connecting members.

[0012] Meanwhile, the second hairpin may include a first pin part spaced apart by a first interval and a second pin part spaced apart by a second interval greater than the first interval.

[0013] Meanwhile, the second hairpin may include pin parts spaced at equal intervals.

[0014] Meanwhile, the second hairpin may include a first pin part spaced apart by a first interval, a second pin part spaced apart by a second interval greater than the first interval, and a third pin part spaced apart by a third interval greater than the first interval and less than the second interval.

[0015] Meanwhile, the number of third pin parts within the second hairpin may be greater than the number of first pin parts or the number of second pin parts.

[0016] Meanwhile, the size of the first region may be larger than the size of the second region.

[0017] Meanwhile, the thickness of the first hairpin may be greater than the thickness of the second hairpin or .

[0018] Meanwhile, the first winding may include even wires.

[0019] Meanwhile, the first winding is arranged across the first to eighth layers from the outer circumference to the inner circumference, and the thickness of the fifth to eighth layers may be smaller than the thickness of the first to fourth layers.

[0020] Meanwhile, some of the even wires within the first winding may be arranged in series in the first layer and the third layer, and in parallel in the fifth layer and the seventh layer, and other some of the even wires within the first winding may be arranged in series in the second layer and the fourth layer, and in parallel in the sixth layer and the eighth layer.

[0021] According to another embodiment of the present disclosure, a stator and a motor including the same include a stator core having a plurality of slots formed therein, and a plurality of windings arranged between an inner circumference and an outer circumference of the stator core, wherein a first winding corresponding to a first phase among the plurality of windings is arranged across a plurality of layers between the outer circumference and the inner circumference of the stator core, and the first winding has a first hairpin arranged in a first region between the outer circumference and the inner circumference of the stator core, and a second hairpin arranged in a second region closer to the inner circumference than the first region and having a length longer than the first hairpin, wherein the number of the second hairpins is smaller than the number of the first hairpins.

[0022] A stator according to an embodiment of the present disclosure and a motor including the same include a stator core having a plurality of slots formed therein, and a plurality of windings arranged between an inner periphery and an outer periphery of the stator core, wherein a first winding corresponding to a first phase among the plurality of windings is arranged across a plurality of layers between the outer periphery and the inner periphery of the stator core, and a thickness of a second layer adjacent to the inner periphery among the plurality of layers is smaller than a thickness of a first layer adjacent to the outer periphery, and is connected in series in a first region between the outer periphery and the inner periphery of the stator core, and is connected in parallel in a second region closer to the inner periphery than the first region between the outer periphery and the inner periphery, and the first winding includes a first hairpin arranged in the first region, and a second hairpin arranged in the second region and having a longer length than the first hairpin. Accordingly, it is possible to reduce heat generation during motor rotation while reducing the number of welded members. In particular, it is possible to reduce heat generation near the inner periphery of the stator core while reducing the number of welded members.

[0023] Meanwhile, the first winding may further include a first connecting member connected to the first hairpin within the first region and a second connecting member connected to the second hairpin within the second region. Accordingly, the number of welding members can be reduced while reducing heat generation during motor rotation.

[0024] Meanwhile, it is preferable that the number of second connecting members be smaller than the number of first connecting members. Accordingly, it is possible to reduce the number of welding members while reducing heat generation during motor rotation.

[0025] Meanwhile, the second hairpin may include a first pin part spaced apart by a first interval and a second pin part spaced apart by a second interval greater than the first interval. Accordingly, the number of welding parts can be reduced while reducing heat generation during motor rotation.

[0026] Meanwhile, the second hairpin may include pin parts spaced at equal intervals. Accordingly, the number of welding parts can be reduced while reducing heat generation during motor rotation.

[0027] Meanwhile, the second hairpin may include a first pin part spaced apart by a first interval, a second pin part spaced apart by a second interval greater than the first interval, and a third pin part spaced apart by a third interval greater than the first interval and smaller than the second interval. Accordingly, it is possible to reduce the number of welding parts while reducing heat generation during motor rotation.

[0028] Meanwhile, the number of third pin parts within the second hairpin may be greater than the number of first pin parts or the number of second pin parts. Accordingly, the number of welded parts can be reduced, while heat generation during motor rotation can be reduced.

[0029] Meanwhile, the size of the first region may be larger than the size of the second region. Accordingly, the number of welded parts can be reduced, while heat generation during motor rotation can be reduced.

[0030] Meanwhile, the thickness of the first hairpin may be greater than the thickness of the second hairpin or . Accordingly, the number of welding parts can be reduced while reducing heat generation during motor rotation.

[0031] Meanwhile, the first winding may include even wires. This reduces the number of welded parts while also reducing heat generation during motor rotation.

[0032] Meanwhile, the first winding is arranged across the first to eighth layers from the outer circumference to the inner circumference, and the thickness of the fifth to eighth layers may be smaller than the thickness of the first to fourth layers. Accordingly, the number of welding parts can be reduced, while heat generation during motor rotation can be reduced.

[0033] Meanwhile, some of the even wires within the first winding may be arranged in series in the first and third layers and in parallel in the fifth and seventh layers, while other some of the even wires within the first winding may be arranged in series in the second and fourth layers and in parallel in the sixth and eighth layers. Accordingly, the number of welding members may be reduced while heat generation during motor rotation may be reduced.

[0034] According to another embodiment of the present disclosure, a stator and a motor including the same include a stator core having a plurality of slots formed therein, and a plurality of windings arranged between an inner periphery and an outer periphery of the stator core, wherein a first winding corresponding to a first phase among the plurality of windings is arranged across a plurality of layers between the outer periphery and the inner periphery of the stator core, and the first winding has a first hairpin arranged in a first region between the outer periphery and the inner periphery of the stator core, and a second hairpin arranged in a second region closer to the inner periphery than the first region and having a longer length than the first hairpin, wherein the number of the second hairpins is smaller than the number of the first hairpins. Accordingly, heat generation during motor rotation can be reduced while reducing the number of welding members. In particular, heat generation near the inner periphery of the stator core can be reduced.

[0035] FIG. 1 is a schematic drawing showing a body of a vehicle according to an embodiment of the present disclosure.

[0036] FIG. 2 is an example of a motor drive system according to an embodiment of the present disclosure.

[0037] Figure 3 illustrates an example of an internal block diagram of the motor driving device of Figure 2.

[0038] Fig. 4 is an example of an internal circuit diagram of the motor driving device of Fig. 3.

[0039] FIG. 5 is an example of a perspective view of a motor according to an embodiment of the present disclosure.

[0040] FIG. 6 is an example of a perspective view of a stator according to an embodiment of the present disclosure.

[0041] FIG. 7a is an example of a winding arrangement within a stator in connection with the present disclosure.

[0042] Fig. 7b is an example of the winding wiring of Fig. 7a.

[0043] FIG. 8a is an example of a winding arrangement within a stator according to an embodiment of the present disclosure.

[0044] Fig. 8b is an example of the winding wiring of Fig. 8a.

[0045] Figures 8c to 8d are various examples of the winding wiring of Figure 8a.

[0046] FIGS. 9A and 9B are examples of windings within a stator in connection with the present disclosure.

[0047] FIGS. 10A to 10C are examples of windings within a stator according to an embodiment of the present disclosure.

[0048] FIGS. 11A and 11B are other examples of windings within a stator according to an embodiment of the present disclosure.

[0049] FIGS. 12A and 12B are further examples of windings within a stator according to an embodiment of the present disclosure.

[0050] Figures 13a to 15d are drawings referenced in the description of Figures 10a to 12b.

[0051] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0052] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0053] FIG. 1 is a schematic drawing showing a body of a vehicle according to an embodiment of the present disclosure.

[0054] Referring to the drawings, a vehicle (100) according to an embodiment of the present disclosure may include a battery (205) that supplies voltage, a motor driving device (200) that receives voltage from the battery (205), a motor (250) that is driven and rotated by the motor driving device (200), front wheels (150) and rear wheels (155) that are rotated by the motor (250), a front suspension device (160) and a rear suspension device (165) that block vibrations of the road surface from being transmitted to the vehicle body, and an inclination detection unit (190) that detects an inclination angle of the vehicle body. Meanwhile, a driving gear (not shown) that converts the rotational speed of the motor (250) based on a gear ratio may be additionally provided.

[0055] The battery (205) supplies voltage to the motor drive device (200). In particular, it supplies direct current voltage to the capacitor (C) in the motor drive device (200).

[0056] Such a battery (205) may be formed by a set of multiple unit cells. The multiple unit cells may be managed by a battery management system (BMS) to maintain a constant voltage, and may discharge a constant voltage by the battery management system.

[0057] For example, the battery management system can detect the voltage (Vbat) of the battery (205) and transmit it to an electronic control unit (not shown) or an inverter control unit (250) within the motor drive device (200), and when the battery voltage (Vbat) falls below a lower limit, the battery can supply a DC voltage stored in a capacitor (C) within the motor drive device (200). In addition, when the battery voltage (Vbat) rises above an upper limit, the battery management system can also supply a DC voltage to the capacitor (C) within the motor drive device (200).

[0058] The battery (205) is preferably composed of a secondary battery that can be charged and discharged, but is not limited thereto.

[0059] The motor drive device (200) receives a direct current voltage from the battery (205) through a voltage input cable (120). The motor drive device (200) converts the direct current voltage received from the battery (205) into an alternating current voltage and supplies it to the motor (250). The converted alternating current voltage is preferably a three-phase alternating current voltage. The motor drive device (200) supplies a three-phase alternating current voltage to the motor (250) through a three-phase output cable (125) provided in the motor drive device (200).

[0060] The motor drive device (200) of Fig. 1 illustrates a three-phase output cable (125) composed of three cables, but three cables may be provided within a single cable.

[0061] Meanwhile, the motor driving device (200) according to the embodiment of the present disclosure is described below in FIG. 3.

[0062] The motor (250) includes a stator (131) that is fixed and does not rotate, and a rotor (135) that rotates. The motor (250) is provided with an input cable (140) and receives an AC voltage supplied from a motor driving device (200). The motor (250) may be, for example, a three-phase motor, and when a voltage-variable / frequency-variable AC voltage of each phase is applied to the coils of each phase's stator, the rotational speed of the rotor varies based on the applied frequency.

[0063] The motor (250) can take various forms, such as an induction motor, a BLDC motor (blushless DC motor), and a reluctance motor.

[0064] Meanwhile, a drive gear (not shown) may 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 wheels (150) and / or the rear wheels (155) to move the vehicle (100).

[0065] The front suspension (160) and rear suspension (165) support the front wheels (150) and rear wheels (155) respectively with respect to the vehicle body. The vertical directions of the front suspension (160) and rear suspension (165) are supported by springs or damping mechanisms to prevent road vibrations from reaching the vehicle body.

[0066] The front wheels (150) may further be equipped with a steering device (not shown). The steering device is a device that controls the direction of the front wheels (150) to drive the vehicle (100) in the direction intended by the driver.

[0067] Meanwhile, although not shown in the drawing, the vehicle (100) may further include an electronic controller for controlling electronic devices throughout the vehicle. The electronic controller (not shown) controls each device so that it can operate, display, etc. In addition, it may also control the battery management system described above.

[0068] In addition, the control unit (170 in FIG. 2) can generate driving command values ​​according to various driving modes (driving mode, reverse mode, neutral mode, parking mode, etc.) based on detection signals from an inclination detection unit (not shown) that detects an inclination angle of the vehicle (100), a speed detection unit (not shown) that detects a speed of the vehicle (100), a brake detection unit (not shown) according to the operation of the brake pedal, an accelerator detection unit (not shown) according to the operation of the accelerator pedal, etc. The driving command value at this time can be, for example, a torque command value or a torque command value.

[0069] Meanwhile, the vehicle (100) according to the embodiment of the present disclosure may be a concept that includes a pure electric vehicle using a battery and a motor, as well as a hybrid electric vehicle using a battery and a motor while using an engine.

[0070] At this time, the hybrid electric vehicle may further be equipped with a switching means capable of selecting at least one of a battery and an engine, and a transmission.

[0071] Meanwhile, hybrid electric vehicles can be divided into a series method that converts mechanical energy output from the engine into electrical energy to drive the motor, a parallel method that simultaneously uses mechanical energy output from the engine and electrical energy from the battery, and a series-parallel method that combines the two.

[0072] FIG. 2 is an example of a motor drive system according to an embodiment of the present disclosure.

[0073] Referring to the drawings, a motor driving system according to one embodiment of the present disclosure may include a vehicle (100) and a server (500).

[0074] Here, the server (500) may be a server operated by the manufacturer of the motor drive device (200) or the vehicle (100), or may correspond to a mobile terminal of the driver of the motor drive device (200) or the vehicle (100).

[0075] Meanwhile, the vehicle (100) may be equipped with an input unit (120), a communication unit (130), a memory (140), a control unit (170), and a motor driving device (200).

[0076] The input unit (120) is equipped with operation buttons, keys, etc., and can output input signals for turning the voltage on / off, setting the operation, etc. of the vehicle (100).

[0077] The communication unit (130) can exchange data with peripheral devices, such as a server (500), wired or wirelessly, or wirelessly with a remote server, etc. For example, it can perform mobile communication such as 4G or 5G, infrared (IR) communication, RF communication, Bluetooth communication, Zigbee communication, WiFi communication, etc.

[0078] Meanwhile, the memory (140) of the vehicle (100) can store data necessary for the operation of the vehicle (100). For example, data regarding the operating time and operating mode of the motor driving device (200) can be stored.

[0079] Additionally, the memory (140) of the vehicle (100) can store management data including power consumption information of the vehicle, recommended driving information, current driving information, and management information.

[0080] Additionally, the memory (140) of the vehicle (100) can store diagnostic data including vehicle operation information, driving information, and error information.

[0081] The control unit (170) can control each unit within the vehicle (100). For example, the control unit (170) can control the input unit (120), the communication unit (130), the memory (140), the motor driving device (200), etc.

[0082] The motor driving device (200) may be referred to as a motor driving unit as a driving unit for driving the motor (250).

[0083] Meanwhile, the motor driving device (200) includes a plurality of inverter switching elements, an inverter (420) that outputs an AC voltage to the motor (250), an output current detection unit (E) that detects the output current (io) flowing in the motor (250), and current information (id, iq) and a torque command value (T) based on the output current (io) detected by the output current detection unit (E). *), it may include an inverter control unit (430) that outputs a switching control signal to the inverter (420).

[0084] Meanwhile, current information (id, iq) and torque command (T) based on the output current (io) * ) can be transmitted to an external server (500), and the current command value (i) from the server (500) * d,i * q) may be received. And, based on the current command value received from the communication unit (130), the inverter control unit (430) may output a switching control signal to the inverter (420).

[0085] Accordingly, the motor (250) can be driven based on a current command value corresponding to the maximum torque calculated in real time by the server (500). Therefore, maximum torque driving of the motor (250) becomes possible.

[0086] Meanwhile, the communication unit (130) in the motor drive device (200) transmits current information (id, iq), torque command value (T * ), and voltage information regarding the detected DC voltage (Vdc) can be transmitted to the server (500). Accordingly, maximum torque operation of the motor (250) under various conditions becomes possible.

[0087] Meanwhile, the detailed operation of the motor driving device (200) is described with reference to FIG. 3.

[0088] Figure 3 illustrates an example of an internal block diagram of the motor driving device of Figure 2.

[0089] Referring to the drawings, a motor driving device (200) according to an embodiment of the present disclosure is a driving device for driving a motor (250), and may include a plurality of inverter switching elements (Sa to Sc, S'a to S'c), an inverter (420) for outputting an AC voltage to the motor (250), and an inverter control unit (430) for controlling the inverter (420). In addition, the motor driving device (200) may include a memory (270) for providing various stored data to the inverter control unit (430).

[0090] Meanwhile, the motor driving device (200) according to the embodiment of the present disclosure may further include a capacitor (C) that stores the dc voltage (Vdc) that is the input terminal of the inverter (420), a dc voltage detection unit (B) that detects the dc voltage (Vdc), an output current detection unit (E) that detects the output current flowing to the motor (250), and a position detection sensor (105).

[0091] According to an embodiment of the present disclosure, the motor (250) may be a three-phase motor driven by an inverter (420).

[0092] Meanwhile, the inverter control unit (430) sets the current command value (i) corresponding to the calculated maximum torque. * d,i * Based on q), a switching control signal (Sic) can be output to the inverter (420). Accordingly, maximum torque driving of the motor (250) becomes possible.

[0093] The inverter control unit (430) according to the embodiment of the present disclosure provides current information (id, iq) and torque command value (T) in real time. * ) and calculate the torque command value (T * ), the current command value (i * d,i * q) and calculate the current command value (i * d,i * q) is used to drive the motor (250). Accordingly, the accuracy for high-efficiency driving is improved.

[0094] Meanwhile, the motor driving device (200) may further include a capacitor (C) that stores the dc voltage (Vdc) of the input terminal of the inverter (420), and a dc voltage detection unit (B) that detects the dc voltage (Vdc).

[0095] The inverter control unit (430) provides current information (id, iq), torque command value (T * ), and based on the detected dc terminal voltage (Vdc), the current command value (i * d,i * q) and calculate the current command value (i * d,i * q) is used to drive the motor (250). Accordingly, the accuracy for high-efficiency driving is improved.

[0096] Fig. 4 is an example of an internal circuit diagram of the motor driving device of Fig. 3.

[0097] Referring to the drawings, a motor driving device (200) according to an embodiment of the present disclosure may include an inverter (420), an inverter control unit (430), an output current detection unit (E), a dc voltage detection unit (Vdc), and a position detection sensor (105).

[0098] Meanwhile, the motor driving device (200) converts power to drive the motor, so it can also be called a power conversion device.

[0099] The dc capacitor (C) stores the voltage input to the dc terminal (ab terminal). In the drawing, one dc capacitor (C) is illustrated as an element, but multiple capacitors may be provided to ensure element stability.

[0100] Meanwhile, the input voltage supplied to the dc capacitor (C) may be a voltage stored in the battery (205) or a voltage level-converted by a converter (not shown).

[0101] Meanwhile, since both ends of the dc capacitor (C) store direct current voltage, they can also be called dc terminals or dc link terminals.

[0102] The DC voltage detection unit (B) can detect the DC voltage (Vdc) at both ends of the DC capacitor (C). To this end, the DC voltage detection unit (B) can include a resistance element, an amplifier, etc. The detected DC voltage (Vdc) can be input to the inverter control unit (430) as a discrete signal in the form of a pulse.

[0103] The inverter (420) has a plurality of inverter switching elements (Sa to Sc, S'a to S'c), and can convert a direct current voltage (Vdc) into a three-phase alternating current voltage (Va, Vb, Vc) of a predetermined frequency by the on / off operation of the switching elements (Sa to Sc, S'a to S'c), and output it to a three-phase synchronous motor (250).

[0104] The inverter (420) is composed of a pair of upper-arm switching elements (Sa, Sb, Sc) and lower-arm switching elements (S'a, S'b, S'c) that are each connected in series with each other, and a total of three pairs of upper and lower-arm switching elements are connected in parallel with each other (Sa&S'a, Sb&S'b, Sc&S'c). A diode is connected in antiparallel to each switching element (Sa, S'a, Sb, S'b, Sc, S'c).

[0105] The switching elements within the inverter (420) perform on / off operations of each switching element based on the inverter switching control signal (Sic) from the inverter control unit (430). As a result, a three-phase AC voltage having a predetermined frequency is output to the three-phase synchronous motor (250).

[0106] The inverter control unit (430) can control the switching operation of the inverter (420) based on a sensorless method.

[0107] To this end, the inverter control unit (430) can receive the output current (io) detected by the output current detection unit (E).

[0108] The inverter control unit (430) can output an inverter switching control signal (Sic) to each gate terminal of the inverter (420) in order to control the switching operation of the inverter (420). Accordingly, the inverter switching control signal (Sic) may also be referred to as a gate driving signal.

[0109] Meanwhile, the inverter switching control signal (Sic) is a switching control signal of pulse width modulation (PWM) method, and is generated and output based on the output current (io) detected by the output current detection unit (E).

[0110] The output current detection unit (E) detects the output current (io) flowing between the inverter (420) and the three-phase motor (250). That is, the current flowing to the motor (250) can be detected.

[0111] The output current detection unit (E) can detect all output currents (ia, ib, ic) of each phase, or can detect the output currents of two phases using three-phase balance.

[0112] The output current detection unit (E) may be located between the inverter (420) and the motor (250), and a CT (current transformer), shunt resistor, etc. may be used to detect the current.

[0113] The detected output current (io) can be applied to the inverter control unit (430) as a discrete signal in the form of a pulse, and a switching control signal (Sic) is generated based on the detected output current (io).

[0114] The position detection sensor (105) can sense the rotor position information (θ) of the motor (250). The sensed position information (θ) can be input to the inverter control unit (430).

[0115] Meanwhile, a three-phase motor (250) has a stator and a rotor, and an AC voltage of a predetermined frequency is applied to the coils of the stator of each phase (a, b, c phase) to cause the rotor to rotate.

[0116] Such motors (250) may include, for example, a surface-mounted permanent-magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM), and a synchronous reluctance motor (Synrm). Among these, SMPMSM and IPMSM are synchronous motors that use permanent magnets (Permanent Magnet Synchronous Motors; PMSM), and Synrm is characterized by not having a permanent magnet.

[0117] FIG. 5 is an example of a perspective view of a motor according to an embodiment of the present disclosure.

[0118] Referring to the drawings, a motor (250) according to an embodiment of the present disclosure includes a housing (310), a stator (400) positioned inside the housing (310), and a rotor (300) positioned in a hollow space within the stator (400) and rotating.

[0119] Meanwhile, the rotor (300) may include a surface-attached permanent magnet or a built-in permanent magnet.

[0120] Meanwhile, the motor (250) according to the embodiment of the present disclosure includes a hairpin motor having a plurality of hairpins.

[0121] FIG. 6 is an example of a perspective view of a stator according to an embodiment of the present disclosure.

[0122] Referring to the drawings, a stator (400) according to an embodiment of the present disclosure includes a stator core (CRE) in which a plurality of slots are formed, and a plurality of windings (APW, BPW, CPW) arranged between the inner and outer peripheries of the stator core (CRE).

[0123] Meanwhile, a hollow space is formed on the inner surface of the stator core (CRE), and the rotor (300) of FIG. 5 can be placed therein.

[0124] Meanwhile, a housing (310) can be formed spaced apart from the outer periphery of the stator core (CRE).

[0125] Meanwhile, multiple windings (APW, BPW, CPW) can correspond to the a-phase winding (APW), b-phase winding (BPW), and c-phase winding (CPW) of the three-phase motor (250) of FIG. 4.

[0126] That is, the a-phase winding (APW) is electrically connected to a node between the first inverter switching element (Sa) and the second inverter switching element (Sa') among the plurality of inverter switching elements (Sa~Sc, S'a~S'c).

[0127] Similarly, the b-phase winding (BPW) is electrically connected to a node between the third inverter switching element (Sb) and the fourth inverter switching element (Sb') among the plurality of inverter switching elements (Sa~Sc, S'a~S'c), and the c-phase winding (CPW) is electrically connected to a node between the fifth inverter switching element (Sc) and the sixth inverter switching element (Sc') among the plurality of inverter switching elements (Sa~Sc, S'a~S'c).

[0128] Meanwhile, each of the multiple windings (APW, BPW, CPW) has multiple hairpins. Accordingly, the cross-sectional area ratio of the conductor to the winding is higher than that of a circular motor, enabling the implementation of a high-efficiency motor (250).

[0129] Fig. 7a is an example of a winding arrangement within a stator related to the present disclosure, and Fig. 7b is an example of a winding wiring of Fig. 7a.

[0130] Referring to the drawing, the stator (400x) related to the present disclosure may include a stator core (CRE) in which a plurality of slots (S1 to S8) are formed, and a plurality of windings, as shown in (a) of FIG. 7a.

[0131] At this time, the winding may include multiple hairpins.

[0132] Meanwhile, a plurality of windings within the stator (400x) related to the present disclosure may be arranged across a plurality of layers (LY1 to LY6) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0133] Meanwhile, the plurality of windings within the stator (400x) related to the present disclosure may include even wires.

[0134] For example, among the plurality of windings in the stator (400x) related to the present disclosure, the first winding (APWx) may include some (WRa) and other some (WRb) of even wires connected in parallel with each other, as shown in FIG. 7b.

[0135] Meanwhile, some of the even wires (WRa) within the first winding (APWx) may be arranged in the first slot (S1) and the second slot (S2) among the plurality of slots (S1 to S8), and in the first layer (LY1), the third layer (LY3), and the fifth layer (LY5) among the first to sixth layers (LY1 to LY6) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 7a.

[0136] Meanwhile, another part (WRb) of the even wires within the first winding (APWx) may be arranged in the second layer (LY2), the fourth layer (LY4), and the sixth layer (LY6) among the first to sixth layers (LY1 to LY6) in the direction from the outer circumference (ORA) to the inner circumference (IRA) in the first slot (S1) and the second slot (S2), as shown in (b) of FIG. 7a.

[0137] Meanwhile, some of the even wires (WRa) within the first winding (APWx) may be arranged in the second layer (LY2), the fourth layer (LY4), and the sixth layer (LY6) among the first to sixth layers (LY1 to LY6) in the direction from the outer circumference (ORA) to the inner circumference (IRA), in the seventh slot (S7) and the eighth slot (S8) among the plurality of slots (S1 to S8), as shown in (c) of FIG. 7a.

[0138] Meanwhile, another part (WRb) of the even wires within the first winding (APWx) may be arranged in the first layer (LY1), the third layer (LY3), and the fifth layer (LY5) among the first to sixth layers (LY1 to LY6) in the direction from the outer circumference (ORA) to the inner circumference (IRA) in the seventh slot (S7) and the eighth slot (S8) as shown in (c) of Fig. 7a.

[0139] As shown in FIGS. 7a and 7b, when the first winding (APWx) is composed of even wires and arranged in parallel, the length of the winding becomes shorter as it gets closer to the inner circumference (IRA) than the outer circumference (ORA) of the stator core (CRE), so the resistance of the winding arranged in the sixth layer (LY6) among the first to sixth layers (LY1 to LY6) becomes the smallest.

[0140] Therefore, when the motor (250) rotates, the most current flows near the 6th layer (LY6) near the inner circumference of the stator (400x), which ultimately causes severe heat generation.

[0141] In addition, since the first winding (APWx) is composed of even wires and is arranged in parallel in a symmetrical manner, a circulating current is generated by the first winding (APWx) in the stator (400x).

[0142] Accordingly, this disclosure proposes a method for reducing heat generation near the inner periphery (IRA) of the stator core (CRE) and preventing circulating current. To this end, an asymmetrical series and parallel winding method is employed. This is described with reference to Fig. 8a and below.

[0143] FIG. 8a is an example of a winding arrangement within a stator according to an embodiment of the present disclosure, and FIG. 8b is an example of a winding wiring of FIG. 8a.

[0144] Referring to the drawing, a stator (400) according to an embodiment of the present disclosure includes a stator core (CRE) in which a plurality of slots (S1 to S48) are formed, as shown in (a) of FIG. 8a, and a plurality of windings (APW, BPW, CPW) arranged between an inner circumference (IRA) and an outer circumference (ORA) of the stator core (CRE).

[0145] Meanwhile, each of the plurality of windings (APW, BPW, CPW) is arranged across multiple layers (LA1 to LA8) between the outer circumference (ORA) and inner circumference (IRA) of the stator core (CRE).

[0146] Meanwhile, multiple windings (APW, BPW, CPW) each include multiple hairpins.

[0147] For example, among the plurality of windings (APW, BPW, CPW), the first winding (APW) corresponding to the first phase is arranged across the plurality of layers (LA1 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0148] Meanwhile, among the multiple layers (LA1 to LA8), it is preferable that the thickness of the second layer (LA8) adjacent to the inner periphery (IRA) be smaller than the thickness of the first layer (LA1) adjacent to the outer periphery (ORA).

[0149] In Fig. 8a, it is exemplified that the thickness of each of the fifth to eighth layers (LA5 to LA8) adjacent to the inner periphery (IRA) is smaller than the thickness of each of the first to fourth layers (LA1 to LA4) adjacent to the outer periphery (ORA) among the multiple layers (LA1 to LA8).

[0150] For example, the thickness of each of the fifth to eighth layers (LA5 to LA8) adjacent to the inner periphery (IRA) may be half of the thickness of each of the first to fourth layers (LA1 to LA4) adjacent to the outer periphery (ORA) among the plurality of layers (LA1 to LA8).

[0151] Accordingly, by compensating for the shortening of the winding length as it gets closer to the inner circumference (IRA) than the outer circumference (ORA) of the stator core (CRE), the resistance of the winding in the fifth to eighth layers (LA5 to LA8) can be made greater than the resistance of the winding in the first to fourth layers (LA1 to LA4).

[0152] Meanwhile, among the multiple layers (LA1 to LA8), the first to fourth layers (LA1 to LA4) adjacent to the outer periphery (ORA) can be named the first region, and the fifth to eighth layers (LA5 to LA8) can be named the second region.

[0153] Meanwhile, the first winding (APW) is connected in series in the first region (LA1 to LA4) between the outer periphery (ORA) and the inner periphery (IRA) of the stator core (CRE), and is connected in parallel in the second region (LA5 to LA8) between the outer periphery (ORA) and the inner periphery (IRA) of the stator core (CRE).

[0154] Meanwhile, the plurality of windings in the stator (400) according to the embodiment of the present disclosure may include even wires.

[0155] Meanwhile, among the plurality of windings in the stator (400) according to the embodiment of the present disclosure, it is preferable that the first winding (APW) is a winding of a mixed series and parallel asymmetrical manner, as shown in FIG. 8b.

[0156] For example, the first winding (APW) may have a series part (WR1) between points PT1 and PT2, a parallel part (WR3) between points PT2 and PT5, a series part (WR2) between points PT7 and PT8, and a parallel part (WR4) between points PT6 and PT7.

[0157] In this way, since the first winding (APW) is composed of even wires and is arranged in an asymmetric manner with a mixture of series and parallel, a circulating current due to the first winding (APW) in the stator (400) is not generated.

[0158] Meanwhile, the serial part (WR1), which is a part of the even wire within the first winding (APW), can be arranged in the first slot (S1) and the second slot (S2) among the plurality of slots (S1 to S8), and in the first layer (LA1) and the third layer (LA3) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0159] Meanwhile, the parallel part (WR3), which is another part of the even wires in the first winding (APW), can be arranged in the first slot (S1) and the second slot (S2) among the plurality of slots (S1 to S8), and in the fifth layer (LA5) and seventh layer (LA7) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0160] Meanwhile, the serial part (WR2), which is a part of the even wire within the first winding (APW), can be arranged in the first slot (S1) and the second slot (S2) among the plurality of slots (S1 to S8), and in the second layer (LA2) and the fourth layer (LA4) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0161] Meanwhile, the parallel part (WR4), which is another part of the even wires in the first winding (APW), can be arranged in the first slot (S1) and the second slot (S2) among the plurality of slots (S1 to S8), and in the sixth layer (LA6) and the eighth layer (LA8) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0162] Meanwhile, the serial part (WR2), which is a part of the even wire within the first winding (APW), may be arranged in the seventh slot (S7) and the eighth slot (S8) among the plurality of slots (S1 to S8), and in the first layer (LA1) and the third layer (LA3) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0163] Meanwhile, the parallel part (WR4), which is another part of the even wires within the first winding (APW), can be arranged in the seventh slot (S7) and the eighth slot (S8) among the plurality of slots (S1 to S8), and in the fifth layer (LA5) and the seventh layer (LA7) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0164] Meanwhile, the serial part (WR1), which is a part of the even wire within the first winding (APW), may be arranged in the seventh slot (S7) and the eighth slot (S8) among the plurality of slots (S1 to S8), and in the second layer (LA2) and the fourth layer (LA4) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0165] Meanwhile, the parallel part (WR3), which is another part of the even wires within the first winding (APW), can be arranged in the seventh slot (S7) and the eighth slot (S8) among the plurality of slots (S1 to S8), and in the sixth layer (LA6) and the eighth layer (LA8) among the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), as shown in (b) of FIG. 8a.

[0166] Meanwhile, as shown in FIGS. 8a and 8b, among the multiple layers (LA1 to LA8), the thickness of the second layer (LA8) adjacent to the inner circumference (IRA) is smaller than the thickness of the first layer (LA1) adjacent to the outer circumference (ORA), and since the first winding (APW) is composed of even wires and arranged in an asymmetric manner with a mixture of series and parallel, heat generation during motor rotation can be reduced. In particular, heat generation can be reduced by reducing the AC resistance during motor rotation.

[0167] Figures 8c to 8d are various examples of the winding wiring of Figure 8a.

[0168] FIG. 8c illustrates that a first winding (APW) among a plurality of windings has a series part (WR1) between points PT1 and PT2, a parallel part (WR3) between points PT2 and PT5, a series part (WR2) between points PT8 and PT7, and a parallel part (WR4) between points PT7 and PT6.

[0169] Meanwhile, Fig. 8c differs from Fig. 8b in that the PT1 and PT8 points are connected in parallel, and the PT5 and PT6 points are connected in parallel.

[0170] Meanwhile, the serial part (WR1), which is a part of the even wires within the first winding (APW), can be placed in the first layer (LA1) and the third layer (LA3), as shown in (b) of Fig. 8a, and the parallel part (WR3), which is another part, can be placed in the fifth layer (LA5) and the seventh layer (LA7), as shown in (b) of Fig. 8a.

[0171] Meanwhile, the serial part (WR2), which is a part of the even wires within the first winding (APW), can be placed in the second layer (LA2) and the fourth layer (LA4), as shown in (b) of Fig. 8a, and the parallel part (WR4), which is another part, can be placed in the sixth layer (LA6) and the eighth layer (LA8).

[0172] FIG. 8d illustrates that a first winding (APW) among a plurality of windings has a series part (WR1) between points PT1 and PT2, and a parallel part (WR3) between points PT2 and PT5.

[0173] Meanwhile, the serial part (WR1), which is a part of the even wires within the first winding (APW), can be placed in the first layer (LA1) and the third layer (LA3), as shown in (b) of Fig. 8a, and the parallel part (WR3), which is another part, can be placed in the fifth layer (LA5) and the seventh layer (LA7), as shown in (b) of Fig. 8a.

[0174] FIG. 8e illustrates that among the plurality of windings, the first winding (APW) has a series part (WR1) between points PT1 and PT2, a parallel part (WR3) between points PT2 and PT5, a series part (WR2) between points PT8 and PT7, a parallel part (WR4) between points PT7 and PT6, a series part (WR5) between points PT9 and PT10, and a parallel part (WR6) between points PT10 and PT11.

[0175] Meanwhile, Fig. 8e differs from Fig. 8c in that the PT1 point, the PT8 point, and the PT9 point are connected in parallel, and the PT5 point, the PT6 point, and the PT10 point are connected in parallel.

[0176] Accordingly, heat generation during motor rotation can be reduced. In particular, heat generation can be reduced by reducing AC resistance during motor rotation. Furthermore, based on asymmetric winding, heat generation during motor rotation can be reduced.

[0177] FIGS. 9A to 9C are examples of windings within a stator related to the present disclosure.

[0178] FIG. 9a illustrates a portion of a first winding within a stator in connection with the present disclosure.

[0179] Referring to the drawing, a portion of the first winding within the stator related to the present disclosure may be between points PT1 and PT5 of FIG. 8b.

[0180] The first winding related to the present disclosure is arranged within a stator core (CRE) in which a plurality of slots (S1 to S48) are formed.

[0181] Meanwhile, the serial part (WR1) of the first winding related to the present disclosure is connected in series in the first region (LA1 to LA4).

[0182] Meanwhile, the parallel part (WR3) of the first winding related to the present disclosure is connected in parallel in the second area (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0183] Meanwhile, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR1) of the first winding has a first hairpin (HPx) of length La and a first connecting member (CTx) connected to the first hairpin (HPx).

[0184] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding has a plurality of hairpins of different sizes. That is, a plurality of hairpins of different sizes are arranged in the second region (LA5 to LA8).

[0185] Specifically, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding includes a second hairpin (HPy) longer than the first hairpin (HPx), and a third hairpin (HPz) arranged in the second region (LA5 to LA8) and shorter than the first hairpin (HPx).

[0186] Meanwhile, the second hairpin (HPy) and the third hairpin (HPz) can be connected in parallel.

[0187] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding may further include a second connecting member (CTy) connected to a second hairpin (HPy) within the second region (LA5 to LA8) and a third connecting member (CTz) connected to a third hairpin (HPz) within the second region (LA5 to LA8).

[0188] Meanwhile, the parallel part (WR3) of the first winding may have a second hairpin (HPy) of length Lb and a third hairpin (HPz) of length Lc arranged alternately.

[0189] FIG. 9b illustrates another portion of the first winding within the stator in connection with the present disclosure.

[0190] Referring to the drawing, another part of the first winding within the stator related to the present disclosure may be between points PT6 and PT8 of FIG. 8b.

[0191] Meanwhile, the parallel part (WR4) of the first winding related to the present disclosure is connected in parallel in the second region (LA5 to LA8).

[0192] Next, the serial part (WR2) of the first winding related to the present disclosure is connected in series in the first region (LA1 to LA4).

[0193] Meanwhile, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR2) of the first winding has a first hairpin (HPx) of length La and a first connecting member (CTx) connected to the first hairpin (HPx).

[0194] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and inner circumference (IRA) of the stator core (CRE), the parallel part (WR4) of the first winding has a plurality of hairpins of different sizes. That is, a plurality of hairpins of different sizes are arranged in the second region (LA5 to LA8).

[0195] Specifically, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR4) of the first winding includes a second hairpin (HPy) longer than the first hairpin (HPx), and a third hairpin (HPz) arranged in the second region (LA5 to LA8) and shorter than the first hairpin (HPx).

[0196] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR4) of the first winding may further include a second connecting member (CTy) connected to a second hairpin (HPy) within the second region (LA5 to LA8) and a third connecting member (CTz) connected to a third hairpin (HPz) within the second region (LA5 to LA8).

[0197] Meanwhile, the parallel part (WR4) of the first winding may have a second hairpin (HPy) of length Lb and a third hairpin (HPz) of length Lc arranged alternately.

[0198] FIG. 9c is a drawing illustrating a plurality of hairpins and a plurality of connecting members in the first region and the second region of FIG. 9a or FIG. 9b.

[0199] Referring to the drawing, the first winding (APW) includes a first hairpin (HPx) having a length La, a second hairpin (HPy) having a length Lb that is longer than the first hairpin (HPx) and is arranged in the second region (LA5 to LA8), and a third hairpin (HPz) having a length Lc that is shorter than the first hairpin (HPx) and is arranged in the second region (LA5 to LA8).

[0200] Meanwhile, the first winding (APW) may further include a first connecting member (CTx) connected between the first hairpins (HPx) in the first region (LA1 to LA4), a second connecting member (CTy) connected between the second hairpins (HPy) in the second region (LA5 to LA8), and a third connecting member (CTz) connected between the third hairpins (HPz) in the second region (LA5 to LA8).

[0201] Meanwhile, the first hairpin (HPx) arranged in the first region (LA1 to LA4) may include a base (BSx), a first bending part (CVxx), and a second bending part (CVxy). Meanwhile, the length of the base (BSx) of the first hairpin (HPx) may be Lx.

[0202] Meanwhile, the second hairpin (HPy) arranged in the second region (LA5 to LA8) may include a base (BSy), a first bending part (CVyx), and a second bending part (CVyy). Meanwhile, the length of the base (BSy) of the second hairpin (HPy) may be Ly.

[0203] Meanwhile, the third hairpin (HPz) arranged in the second region (LA5 to LA8) may include a base (BSz), a first bending part (CVzx), and a second bending part (CVzy). Meanwhile, the length of the base (BSz) of the third hairpin (HPz) may be Lz.

[0204] According to FIGS. 9a to 9c, the first winding includes a first hairpin (HPx) arranged in a first region (LA1 to LA4), a first connecting member (CTx) connected to the first hairpin (HPx), a second hairpin (HPy) arranged in a second region (LA5 to LA8), a second connecting member (CTy) connected to the second hairpin (HPy), a third hairpin (HPz), and a third connecting member (CTz) connected to the third hairpin (HPz).

[0205] The number of first connecting members (CTx) may be approximately 16, and the number of second connecting members (CTy) and third connecting members (CTz) may be approximately 9.

[0206] Meanwhile, the first connecting member (CTx) requires welding for electrical connection, and accordingly, a welding member (CNTmx) is attached by welding, as shown in FIGS. 9a and 9b.

[0207] Similarly, the second connecting member (CTy) and the third connecting member (CTz) require welding for electrical connection, respectively, and accordingly, as shown in FIGS. 9a and 9b, welding members (CNTmy, CNTmz) are attached by welding.

[0208] Meanwhile, the number of welding members (CNTmx) for the first connecting member (CTx) may be approximately 16, the number of welding members (CNTmy) for the second connecting member (CTy) and the number of welding members (CNTmz) for the third connecting member (CTz) may be approximately 9.

[0209] That is, the number of welding members (CNTmx) in the first region (LA1 to LA4) may be approximately 16, and the number of welding members (CNTmy, CNTmz) in the second region (LA5 to LA8) may be approximately 19.

[0210] In this way, as the number of welding parts becomes significant, the first winding operation becomes difficult.

[0211] Accordingly, the present disclosure proposes a method for reducing heat generation during motor rotation while reducing the number of welded parts. In particular, a method for reducing heat generation in the area near the inner circumference (IRA) of the stator core (CRE) while reducing the number of welded parts is proposed. This is described with reference to FIG. 10a and below.

[0212] FIGS. 10A to 10C are examples of windings within a stator according to an embodiment of the present disclosure.

[0213] FIG. 10A illustrates a portion of a first winding within a stator according to an embodiment of the present disclosure.

[0214] Referring to the drawing, a portion of the first winding in the stator according to the embodiment of the present disclosure may be between points PT1 and PT5 of FIG. 8b.

[0215] A first winding according to an embodiment of the present disclosure is arranged within a stator core (CRE) in which a plurality of slots (S1 to S48) are formed.

[0216] Meanwhile, the serial part (WR1) of the first winding according to the embodiment of the present disclosure is connected in series in the first region (LA1 to LA4).

[0217] That is, the serial part (WR1) of the first winding according to the embodiment of the present disclosure starts from the PT1 point and the first slot (S1) where point 1 is located, passes through points 2, 3,...31, passes through the 43rd slot (S43) where point 32 is located, and passes through the PT2 point.

[0218] That is, the serial part (WR1) of the first winding according to the embodiment of the present disclosure is connected in series in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0219] Next, the parallel part (WR3) between the PT3 or PT4 point and the PT5 point of the first winding according to the embodiment of the present disclosure starts from the first slot (S1) where the PT3 or PT4 point and the 33 point are located, respectively, and passes through the points 33, 34,...47, the 43rd slot (S43) where the 48 point is located, and the PT5 point.

[0220] That is, the parallel part (WR3) of the first winding according to the embodiment of the present disclosure is connected in parallel in the second area (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0221] Meanwhile, the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0222] That is, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR1) of the first winding has a first hairpin (HPa) and a first connecting member (CTa) connected to the first hairpin (HPa).

[0223] The first hairpin (HPa) at this time is a single hairpin, and may be a 'U' shaped hairpin.

[0224] For example, the first hairpin (HPa) may be positioned between the first slot (S1) at point 1 and the seventh slot (S7) at point 2, between the thirteenth slot (S13) at point 3 and the nineteenth slot (S19) at point 4, between the twenty-fifth slot (S25) at point 5 and the thirty-first slot (S31) at point 6, between the thirty-seventh slot (S37) at point 7 and the forty-third slot (S43) at point 8, etc.

[0225] Meanwhile, the first connecting member (CTa) may be positioned between the 7th slot (S7) at point 2 and the 13th slot (S13) at point 3, between the 19th slot (S19) at point 4 and the 25th slot (S25) at point 5, between the 31st slot (S31) at point 6 and the 37th slot (S37) at point 7, etc.

[0226] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding has a second hairpin (HPb) and a second connecting member (CTb) connected to the second hairpin (HPb).

[0227] At this time, the second hairpin (HPb) may be a continuous hairpin.

[0228] For example, the second hairpin (HPb) may be positioned between the first slot (S1) at point 33 and the 44th slot (S44) at point 48, or between the second slot (S2) at point 33 and the 43rd slot (S43) at point 48.

[0229] Specifically, between points 33 and 48, two second hairpins (HPb), which are continuous hairpins, can be connected in parallel with each other.

[0230] Meanwhile, the second connecting member (CTb) can be connected to the first slot (S1) portion, which is the 33rd point of the second hairpin (HPb), and the 44th slot (S44) portion, which is the 48th point of the second hairpin (HPb), respectively.

[0231] Meanwhile, another second connecting member (CTb) can be connected to the second slot (S2) portion, which is the 33rd point of the second hairpin (HPb), and the 43rd slot (S43) portion, which is the 48th point of the second hairpin (HPb), respectively.

[0232] That is, two connecting members (CTb) can be connected to both ends of one second hairpin (HPb). Consequently, two second connecting members (CTb) can be connected to each of the two second hairpins (HPb) that are connected in parallel, so that a total of four second connecting members (CTb) can be arranged.

[0233] In this way, since four connecting members (CTb) are arranged between the 33rd slot (S33) and the 48th slot (S38), the number of welding members (CNTb) for the second connecting members (CTb) in the second region (LA5 to LA8) can be approximately four.

[0234] Meanwhile, in the first winding of Fig. 10a, the number of welding members (CNTa) in the first region (LA1 to LA4) may be approximately 16, and the number of welding members (CNTb) in the second region (LA5 to LA8) may be approximately 4.

[0235] Compared to FIGS. 9a to 9c, the number of welding members (CNTa) in the first region (LA1 to LA4) is the same, but the number of welding members (CNTb) in the second region (LA5 to LA8) is significantly reduced.

[0236] Meanwhile, resistance in the second region (LA5 to LA8) is reduced, reducing heat generation during motor rotation. In particular, heat generation near the inner circumference (IRA) of the stator core (CRE) is reduced.

[0237] Meanwhile, when comparing the first region (LA1 to LA4) and the second region (LA5 to LA8), as shown in the drawing, it is preferable that the number of second connecting members (CTb) be smaller than the number of first connecting members (CTa). Accordingly, it is possible to reduce the number of welding members while reducing heat generation near the inner periphery (IRA) of the stator core (CRE).

[0238] Meanwhile, the second hairpin (HPb) may include a first pin part (PTb) spaced apart by a first interval, a second pin part (PTc) connected to the first pin part (PTb) and spaced apart by a second interval greater than the first interval.

[0239] That is, the first pin part (PTb) can be arranged at intervals of 5 slots, and the second pin part (PTc) can be arranged at intervals of 7 slots.

[0240] In the drawing, it is illustrated that the first pin part (PTb) and the second pin part (PTc) are alternately arranged within the second hairpin (HPb).

[0241] Accordingly, the number of first pin parts (PTb) and the number of second pin parts (PTc) in the second hairpin (HPb) may be the same.

[0242] This asymmetric arrangement reduces heat generation during motor rotation. Specifically, heat generation is reduced by reducing AC resistance during motor rotation. Furthermore, based on the asymmetric winding, heat generation during motor rotation can be reduced.

[0243] Meanwhile, according to another embodiment of the present disclosure, the number of second hairpins (HPb) is smaller than the number of first hairpins (HPa).

[0244] In the drawing, the number of first hairpins (HPa) is approximately 16, and the number of second hairpins (HPb) connected in parallel is 2.

[0245] Meanwhile, resistance in the second region (LA5 to LA8) is reduced, reducing heat generation during motor rotation. In particular, heat generation near the inner circumference (IRA) of the stator core (CRE) is reduced.

[0246] FIG. 10b illustrates another portion of the first winding within the stator according to an embodiment of the present disclosure.

[0247] Referring to the drawing, another part of the first winding within the stator according to the embodiment of the present disclosure may be between points PT6 and PT8 of FIG. 8b.

[0248] Meanwhile, the parallel part (WR4) of the first winding according to the embodiment of the present disclosure is connected in parallel in the second region (LA5 to LA8).

[0249] That is, the parallel part (WR4) of the first winding according to the embodiment of the present disclosure starts from the PT6 point and the first slot (S1) or the second slot (S2) where point 1 is located, passes through points 2, 3,...15, and passes through the seventh slot (S7) or the eighth slot (S8) where point 16 is located.

[0250] Next, the serial part (WR2) of the first winding according to the embodiment of the present disclosure is connected in series in the first region (LA1 to LA4).

[0251] That is, the serial part (WR2) of the first winding according to the embodiment of the present disclosure starts from the second slot (S2) where point PT7 and point 17 are located, passes through points 18, 19,...47, and passes through the seventh slot (S7) where point 48 is located.

[0252] Meanwhile, the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0253] That is, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR2) of the first winding has a first hairpin (HPa) and a first connecting member (CTa) connected to the first hairpin (HPa).

[0254] The first hairpin (HPa) at this time is a single hairpin, and may be a 'U' shaped hairpin.

[0255] For example, the first hairpin (HPa) may be positioned between the second slot (S2) at point 17 and the 44th slot (S44) at point 18, between the 38th slot (S38) at point 19 and the 32nd slot (S32) at point 20, between the 26th slot (S26) at point 21 and the 20th slot (S20) at point 22, between the 14th slot (S14) at point 23 and the 8th slot (S8) at point 24, etc.

[0256] Meanwhile, the first connecting member (CTa) may be positioned between the 44th slot (S44) at point 18 and the 38th slot (S38) at point 19, between the 32nd slot (S32) at point 20 and the 26th slot (S26) at point 21, between the 20th slot (S20) at point 22 and the 14th slot (S14) at point 23, between the 7th slot (S7) at point 24 and the 1st slot (S1) at point 25, etc.

[0257] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding has a second hairpin (HPb) and a second connecting member (CTb) connected to the second hairpin (HPb).

[0258] At this time, the second hairpin (HPb) may be a continuous hairpin.

[0259] For example, the second hairpin (HPb) can be positioned between the first slot (S1) at point 1 and the eighth slot (S8) at point 16, or between the second slot (S2) at point 1 and the seventh slot (S7) at point 16.

[0260] Specifically, between points 1 and 16, two second hairpins (HPb), which are continuous hairpins, can be connected in parallel with each other.

[0261] Meanwhile, the second connecting member (CTb) can be connected to the first slot (S1) portion, which is the 1st point of the second hairpin (HPb), and the eighth slot (S8) portion, which is the 16th point of the second hairpin (HPb), respectively.

[0262] Meanwhile, another second connecting member (CTb) can be connected to the second slot (S2) portion, which is the 1st point of the second hairpin (HPb), and the 7th slot (S7) portion, which is the 16th point of the second hairpin (HPb), respectively.

[0263] That is, two connecting members (CTb) can be connected to both ends of one second hairpin (HPb). Consequently, two second connecting members (CTb) can be connected to each of the two second hairpins (HPb) that are connected in parallel, so that a total of four second connecting members (CTb) can be arranged.

[0264] In this way, since four connecting members (CTb) are arranged, the number of welding members (CNTd) for the second connecting members (CTb) in the second region (LA5 to LA8) can be approximately four.

[0265] Meanwhile, in the first winding of FIG. 10b, the number of welding members (CNTc) in the first region (LA1 to LA4) may be approximately 16, and the number of welding members (CNTd) in the second region (LA5 to LA8) may be approximately 4.

[0266] Compared to FIGS. 9a to 9c, the number of welding members (CNTc) in the first region (LA1 to LA4) is the same, but the number of welding members (CNTd) in the second region (LA5 to LA8) is significantly reduced.

[0267] Meanwhile, resistance in the second region (LA5 to LA8) is reduced, reducing heat generation during motor rotation. In particular, heat generation near the inner circumference (IRA) of the stator core (CRE) is reduced.

[0268] Meanwhile, referring to FIGS. 10a and 10b, it is preferable that the size of the first region (LA1 to LA4) be larger than the size of the second region (LA5 to LA8).

[0269] Meanwhile, according to FIGS. 10a and 10b, the thickness of the first hairpin (HPa) may be greater than the thickness of the second hairpin (HPb) or (HPc). Accordingly, the number of welding members can be reduced, while heat generation during motor rotation can be reduced.

[0270] Meanwhile, according to FIGS. 10a and 10b, the first winding (APW) may include an even wire.

[0271] In particular, the first winding (APW) is arranged across the first to eighth layers (LA1 to LA8) in the direction from the outer circumference (ORA) to the inner circumference (IRA), and the thickness of the fifth to eighth layers (LA5 to LA8) may be smaller than the thickness of the first to fourth layers (LA1 to LA4). Accordingly, the number of welding members can be reduced while reducing heat generation during motor rotation.

[0272] FIG. 10c is a drawing illustrating winding in the first slot and the second slot of FIG. 10a or FIG. 10b.

[0273] Referring to the drawing, as shown in FIG. 10a, some of the even wires (WR1) in the first winding (APW) are arranged in series in the first slot (S1) and the second slot (S2), in the first layer (LA1) and the third layer (LA3), and some of the other wires (WR3) are arranged in parallel in the fifth layer (LA5) and the seventh layer (LA7).

[0274] Meanwhile, as shown in Fig. 10b, another portion (WR2) of the even wires within the first winding (APW) may be arranged in series in the second layer (LA8) and the fourth layer (LA4) in the first slot (S1) and the second slot (S2), and another portion (WR4) may be arranged in parallel in the sixth layer (LA6) and the eighth layer (LA8). Accordingly, the number of welding members may be reduced, while heat generation during motor rotation may be reduced.

[0275] Finally, as shown in FIG. 10c, in the first slot (S1) and the second slot (S2), the series part (WR1) of the first winding (APW) is arranged in the first layer (LA1) and the third layer (LA3) among the first to eighth layers (LA1 to LA8), the series part (WR2) of the first winding (APW) is arranged in the second layer (LA2) and the fourth layer (LA4), the parallel part (WR3) of the first winding (APW) is arranged in the fifth layer (LA5) and the seventh layer (LA7), and the parallel part (WR4) of the first winding (APW) is arranged in the sixth layer (LA6) and the eighth layer (LA8).

[0276] Meanwhile, a stator (400) according to another embodiment of the present disclosure includes a plurality of windings (APW, BPW, CPW) arranged between an inner circumference (IRA) and an outer circumference (ORA) of a stator core (CRE), and a first winding (APW) corresponding to a first phase among the plurality of windings (APW, BPW, CPW) includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), and a second hairpin (HPb) arranged in a second region (LA5 to LA8) closer to the inner circumference (IRA) than the first region (LA1 to LA4), and having a longer length than the first hairpin (HPa).

[0277] At this time, the first hairpin (HPa) may be a single hairpin, a 'U'-shaped hairpin (UP), and the second hairpin (HPb) may be a continuous hairpin (CP). Accordingly, the number of welding parts can be reduced, while heat generation during motor rotation can be reduced. In particular, heat generation can be reduced by reducing AC resistance during motor rotation.

[0278] FIGS. 11A and 11B are other examples of windings within a stator according to an embodiment of the present disclosure.

[0279] FIG. 11A illustrates a portion of a first winding within a stator according to an embodiment of the present disclosure.

[0280] Referring to the drawing, the serial part (WR1) of the first winding according to the embodiment of the present disclosure is connected in series in the first region (LA1 to LA4).

[0281] Meanwhile, the parallel part (WR3) of the first winding according to the embodiment of the present disclosure is connected in parallel in the second area (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE).

[0282] Meanwhile, the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0283] Meanwhile, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR1) of the first winding has a first hairpin (HPa) and a first connecting member (CTa) connected to the first hairpin (HPa).

[0284] The first hairpin (HPa) at this time is a single hairpin, and may be a 'U' shaped hairpin.

[0285] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR3) of the first winding has a second hairpin (HPb) and a second connecting member (CTb) connected to the second hairpin (HPb).

[0286] At this time, the second hairpin (HPb) may be a continuous hairpin.

[0287] Meanwhile, the second hairpin (HPb), unlike in FIG. 10a, may only include a third pin part (PTa) spaced apart by the same third interval.

[0288] That is, the second hairpin (HPb) may not have the first pin part (PTb) or the second pin part (PTc) of FIG. 10a.

[0289] At this time, the third interval may be larger than the first interval described above and smaller than the second interval. For example, the third pin part (PTa) may be arranged at six slot intervals.

[0290] Meanwhile, in the first winding of Fig. 11a, the number of welding members (CNTa1) in the first region (LA1 to LA4) may be approximately 16, and the number of welding members (CNTb1) in the second region (LA5 to LA8) may be approximately 4.

[0291] Accordingly, the resistance in the second region (LA5 to LA8) is reduced, and heat generation during motor rotation can be reduced. In particular, heat generation near the inner circumference (IRA) of the stator core (CRE) can be reduced.

[0292] Meanwhile, when comparing the first region (LA1 to LA4) and the second region (LA5 to LA8), as shown in the drawing, it is preferable that the number of second connecting members (CTb1) be smaller than the number of first connecting members (CTa1). Accordingly, heat generation near the inner circumference (IRA) of the stator core (CRE) can be reduced.

[0293] FIG. 11b illustrates another portion of the first winding within the stator according to an embodiment of the present disclosure.

[0294] Referring to the drawing, the parallel part (WR4) of the first winding according to the embodiment of the present disclosure is connected in parallel in the second region (LA5 to LA8).

[0295] Meanwhile, the serial part (WR2) of the first winding according to the embodiment of the present disclosure is connected in series in the first region (LA1 to LA4).

[0296] Meanwhile, the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0297] Meanwhile, in the first region (LA1 to LA4) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the series part (WR2) of the first winding has a first hairpin (HPa) and a first connecting member (CTa) connected to the first hairpin (HPa).

[0298] The first hairpin (HPa) at this time is a single hairpin, and may be a 'U' shaped hairpin.

[0299] Meanwhile, in the second region (LA5 to LA8) between the outer circumference (ORA) and the inner circumference (IRA) of the stator core (CRE), the parallel part (WR4) of the first winding has a second hairpin (HPb) and a second connecting member (CTb) connected to the second hairpin (HPb).

[0300] At this time, the second hairpin (HPb) may be a continuous hairpin.

[0301] Meanwhile, the second hairpin (HPb), unlike in FIG. 10b, may only include a third pin part (PTb) spaced apart by the same third interval.

[0302] Meanwhile, in the first winding of Fig. 11b, the number of welding members (CNTc1) in the first region (LA1 to LA4) may be approximately 16, and the number of welding members (CNTd1) in the second region (LA5 to LA8) may be approximately 4.

[0303] Accordingly, the resistance in the second region (LA5 to LA8) is reduced, and heat generation during motor rotation can be reduced. In particular, heat generation near the inner circumference (IRA) of the stator core (CRE) can be reduced.

[0304] Meanwhile, when comparing the first region (LA1 to LA4) and the second region (LA5 to LA8), as shown in the drawing, it is preferable that the number of second connecting members (CTd1) be smaller than the number of first connecting members (CTc1). Accordingly, heat generation near the inner circumference (IRA) of the stator core (CRE) can be reduced.

[0305] FIGS. 12A and 12B are further examples of windings within a stator according to an embodiment of the present disclosure.

[0306] FIG. 12a illustrates a portion of a first winding within a stator according to an embodiment of the present disclosure.

[0307] Referring to the drawings, a first winding according to an embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0308] Specifically, the serial part (WR1) of the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4), and the parallel part (WR3) of the first winding includes a second hairpin (HPb) arranged in a second region (LA5 to LA8).

[0309] The first hairpin (HPa) and the second connecting member (CTb) of Fig. 12a are similar to those of Fig. 10a or Fig. 11a, but the second hairpin (HPb) has some differences.

[0310] The second hairpin (HPb) of Fig. 12a is a continuous hairpin, and may include a third fin part (PTa) spaced apart by a third interval, a second fin part (PTc) spaced apart by a second interval greater than the third interval, a third fin part (PTa), and a first fin part (PTb) spaced apart by a first interval smaller than the third interval.

[0311] As another example, the second hairpin (HPb) may be a continuous hairpin, in which a first fin part (PTb) spaced apart by a first interval, a third fin part (PTa) spaced apart by a third interval, a second fin part (PTc) spaced apart by a second interval, and a third fin part (PTa) spaced apart by a third interval are repeated.

[0312] That is, the number of third pin parts (PTa) within the second hairpin (HPb) may be greater than the number of first pin parts (PTb) or the number of second pin parts (PTc).

[0313] This asymmetric arrangement reduces heat generation during motor rotation. Specifically, heat generation is reduced by reducing AC resistance during motor rotation. Furthermore, based on the asymmetric winding, heat generation during motor rotation can be reduced.

[0314] Meanwhile, when comparing the first region (LA1 to LA4) and the second region (LA5 to LA8), as shown in the drawing, it is preferable that the number of second connecting members (CTb2) be smaller than the number of first connecting members (CTa2). Accordingly, heat generation near the inner circumference (IRA) of the stator core (CRE) can be reduced.

[0315] FIG. 12b illustrates another portion of the first winding within the stator according to an embodiment of the present disclosure.

[0316] Referring to the drawings, the serial part (WR3) of the first winding according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4), and the parallel part (WR4) of the first winding includes a second hairpin (HPb) arranged in a second region (LA5 to LA8).

[0317] The first hairpin (HPa) and the second connecting member (CTb) of Fig. 12b are similar to those of Fig. 10a or Fig. 11a, but the second hairpin (HPb) has some differences.

[0318] The second hairpin (HPb) of Fig. 12a is a continuous hairpin, and may include a third fin part (PTa) spaced apart by a third interval, a second fin part (PTc) spaced apart by a second interval greater than the third interval, a third fin part (PTa), and a first fin part (PTb) spaced apart by a first interval smaller than the third interval.

[0319] As another example, the second hairpin (HPb) may be a continuous hairpin, in which a first fin part (PTb) spaced apart by a first interval, a third fin part (PTa) spaced apart by a third interval, a second fin part (PTc) spaced apart by a second interval, and a third fin part (PTa) spaced apart by a third interval are repeated.

[0320] That is, the number of third pin parts (PTa) within the second hairpin (HPb) may be greater than the number of first pin parts (PTb) or the number of second pin parts (PTc).

[0321] This asymmetric arrangement reduces heat generation during motor rotation. Specifically, heat generation is reduced by reducing AC resistance during motor rotation. Furthermore, based on the asymmetric winding, heat generation during motor rotation can be reduced.

[0322] Meanwhile, when comparing the first region (LA1 to LA4) and the second region (LA5 to LA8), as shown in the drawing, it is preferable that the number of second connecting members (CTd2) be smaller than the number of first connecting members (CTc2). Accordingly, it is possible to reduce heat generation near the inner circumference (IRA) of the stator core (CRE) while reducing the number of welding members.

[0323] Figures 13a to 15d are drawings referenced in the description of Figures 10a to 12b.

[0324] First, FIG. 13a is a drawing illustrating the connection of a plurality of first hairpins according to an embodiment of the present disclosure.

[0325] Referring to the drawing, welding is required to connect a plurality of first hairpins (UPa, UPc), and accordingly, a welding member (CNTa) is attached by welding as shown in the drawing.

[0326] FIG. 13b illustrates an example of a second hairpin according to an embodiment of the present disclosure.

[0327] Referring to the drawing, the second hairpin (CP) is a continuous hairpin and may have a plurality of pin parts.

[0328] For example, the second hairpin (CP) may include a first pin part (PTb) spaced apart by a first interval, as shown in FIGS. 10a and 10b, and a second pin part (PTc) connected to the first pin part (PTb) and spaced apart by a second interval greater than the first interval.

[0329] As another example, the second hairpin (CP) may include a third pin part (PTa) spaced apart by a third interval, as shown in FIGS. 11a and 11b.

[0330] As another example, the second hairpin (CP) may include a first fin part (PTb) spaced apart by a first interval, a second fin part (PTc) spaced apart by a second interval, and a third fin part (PTa) spaced apart by a third interval, as shown in FIGS. 12a and 12b.

[0331] Due to this second hairpin (CP), the number of welded parts is significantly reduced, and thus, while reducing the number of welded parts, heat generation during motor rotation can be reduced. In particular, while reducing the number of welded parts, heat generation near the inner periphery (IRA) of the stator core (CRE) can be reduced.

[0332] Figure 14a is an example of a flowchart for mounting the first hairpin to the stator core.

[0333] Referring to the drawing, first, the wire is formed into a U shape (S1410). Accordingly, as shown in Fig. 13a, a single first hairpin (HPa) can be formed.

[0334] Next, a plurality of first hairpins (HPa) are arranged (S1412).

[0335] Next, the arrayed plurality of first hairpins (HPa) are inserted into the stator core (CRE) (S1414).

[0336] When inserting the first hairpin (HPa), the first hairpin (HPa) can be rotated to pass through the opening of the slot of the stator core (CRE).

[0337] Next, the first hairpin (HPa) inserted into the stator core (CRE) is twisted and welded (S1416).

[0338] Accordingly, as shown in Fig. 13a, the welding member (CNTa) is attached by performing welding between the first hairpins (HPa).

[0339] Figure 14b is an example of a flowchart for mounting the second hairpin to the stator core.

[0340] Referring to the drawing, first, the wire is formed into a continuous hairpin (S1420). Accordingly, a continuous hairpin can be formed, as shown in Fig. 13b.

[0341] Next, two second hairpins (HPb) are woven for parallel connection (S1422).

[0342] Next, the second hairpin (HPb) is formed radially (S1424). That is, the second hairpin (HPb) is formed to have a cylindrical shape.

[0343] Next, the second hairpin (HPb) is inserted into the stator core (CRE) (S1426). When the second hairpin (HPb) is inserted, it can pass through the opening of the slot of the stator core (CRE).

[0344] Figure 14c illustrates inserting a hairpin into a slot within the stator core.

[0345] Referring to the drawing, when inserting a hairpin (1410) into a slot (S1, S2) in a stator core (CRE), it is preferable to rotate the hairpin (1410) so that it passes through the opening (SOP) of the slot (S1, S2).

[0346] Accordingly, the width (Wa) of the hairpin (1410), which is larger than the opening (SOP), can be reduced to Wb, which is smaller than the opening (SOP), so that the hairpin (1410) can pass through the opening (SOP) and be mounted in the slot (S1, S2).

[0347] At this time, the hairpin (1410) may be a first hairpin (HPa). Furthermore, the hairpin (1410) may also be a second hairpin (HPb).

[0348] FIG. 15a illustrates a portion of a first winding according to an embodiment of the present disclosure.

[0349] Referring to the drawing, the first winding (1500x) according to the embodiment of the present disclosure includes a first hairpin (HPa) arranged in a first region (LA1 to LA4) and a second hairpin (HPb) arranged in a second region (LA5 to LA8) and having a longer length than the first hairpin (HPa).

[0350] Meanwhile, looking at the multiple areas (Ara, Arb, Arc, Ard, Are) among the areas where the first winding is placed in the drawing, the first hairpin (HPa) is placed at intervals of six slots.

[0351] Meanwhile, looking at the multiple areas (Ara, Arb, Arc, Ard, Are) among the areas where the first winding is placed in the drawing, the spacing between the pin parts within the second hairpin (HPb) can be six slot spacings.

[0352] That is, the first hairpin (HPa) or the second hairpin (HPb) can be positioned while moving at an interval of 6 pitches or 6 slots.

[0353] Figure 15b illustrates a 6 pitch or 6 slot spacing.

[0354] Referring to the drawing, a plurality of first hairpins arranged within the stator core (CRE) are exemplified as HP1, HP2, HP3, HP4, HP5, HP6, HP7, etc., and can be twisted at 6 pitches or 6 slot intervals during twisting in step S1416 of section 14a.

[0355] FIG. 15c is a drawing illustrating a plurality of hairpins related to the present disclosure.

[0356] Referring to the drawing, the first winding (1500) related to the present disclosure includes a plurality of hairpins (UPa, UPb, UPc, UPd) in a U-pin shape within a slot (STx).

[0357] According to this, since multiple hairpins (UPa, UPb, UPc, UPd) must be welded separately, motor manufacturing may not be easy due to increased welding.

[0358] FIG. 15d is a drawing illustrating a plurality of hairpins according to an embodiment of the present disclosure.

[0359] Referring to the drawings, the first winding related to the present disclosure includes a first hairpin (UPa, UPb) having a U-pin shape within a slot (ST) and a second hairpin (CPa, CPb) which is a continuous hairpin.

[0360] Accordingly, since welding is significantly reduced due to the second hairpin (CPa, CPb), heat generation during motor rotation can be reduced while reducing the number of welded parts. In particular, heat generation near the inner periphery of the stator core can be reduced while reducing the number of welded parts.

[0361] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. A stator core having multiple slots formed therein; A plurality of windings arranged between the inner and outer peripheries of the stator core; The first winding corresponding to the first phase among the multiple windings is arranged across multiple layers between the outer periphery and the inner periphery of the stator core, Among the plurality of layers, the thickness of the second layer adjacent to the inner circumference is smaller than the thickness of the first layer adjacent to the outer circumference, Connected in series in a first region between the outer circumference and the inner circumference of the stator core, and connected in parallel in a second region closer to the inner circumference than the first region between the outer circumference and the inner circumference, The above first winding is, A first hairpin placed in the first area; A stator comprising a second hairpin disposed in a second region and having a longer length than the first hairpin.

2. In paragraph 1, The above first winding is, A first connecting member connected to the first hairpin within the first region; A stator further comprising a second connecting member connected to the second hairpin within the second region.

3. In paragraph 2, A stator in which the number of the second connecting members is less than the number of the first connecting members.

4. In paragraph 1, The above second hairpin is, A first pin part spaced apart by a first interval, A stator comprising a second pin part connected to the first pin part and spaced apart by a second interval greater than the first interval.

5. In paragraph 1, The above second hairpin is, A stator comprising pin parts spaced at equal intervals.

6. In paragraph 1, The above second hairpin is, A first pin part spaced apart by a first interval, A second pin part spaced apart by a second interval greater than the first interval, A stator comprising a third fin part spaced apart by a third interval greater than the first interval and less than the second interval.

7. In paragraph 6, The number of the third pin parts within the second hairpin is A stator having a number greater than the number of the first pin parts or the number of the second pin parts.

8. In paragraph 1, A stator in which the size of the first region is larger than the size of the second region.

9. In paragraph 1, A stator wherein the thickness of the first hairpin is greater than the thickness of the second hairpin.

10. In paragraph 1, The above first winding is, A stator comprising even wires.

11. In paragraph 1, The above first winding is, It is arranged across the first to eighth layers in the inner direction from the outer direction, A stator wherein the thickness of the fifth to eighth layers is smaller than the thickness of the first to fourth layers.

12. In paragraph 11, Some of the even wires in the first winding are arranged in series in the first layer and the third layer, and in parallel in the fifth layer and the seventh layer, A stator wherein another portion of the even wires within the first winding are arranged in series in the second layer, the fourth layer, and in parallel in the sixth layer, the eighth layer.

13. A stator core having multiple slots formed therein; A plurality of windings arranged between the inner and outer peripheries of the stator core; The first winding corresponding to the first phase among the multiple windings is arranged across multiple layers between the outer periphery and the inner periphery of the stator core, The above first winding is, A first hairpin arranged in a first region between the outer circumference and the inner circumference of the stator core; A second hairpin is disposed in a second region closer to the inner circumference than the first region and has a longer length than the first hairpin; A stator in which the number of the second hairpins is smaller than the number of the first hairpins.

14. In paragraph 13, A first connecting member connected to the first hairpin within the first region; A stator further comprising a second connecting member connected to the second hairpin within the second region.

15. In paragraph 14, A stator in which the number of the second connecting members is less than the number of the first connecting members.

16. In paragraph 13, The above second hairpin is, A first pin part spaced apart by a first interval, A stator comprising a second pin part connected to the first pin part and spaced apart by a second interval greater than the first interval.

17. In paragraph 13, The above second hairpin is, A stator comprising pin parts spaced at equal intervals.

18. In paragraph 13, The above second hairpin is, A first pin part spaced apart by a first interval, A second pin part spaced apart by a second interval greater than the first interval, A stator comprising a third fin part spaced apart by a third interval greater than the first interval and less than the second interval.

19. In paragraph 18, The number of the third pin parts within the second hairpin is A stator having a number greater than the number of the first pin parts or the number of the second pin parts.

20. A stator according to any one of paragraphs 1 to 19; A motor including a rotor that is arranged in a hollow space within the stator and rotates.

Images