Motor and motor stator

Abstract

A motor and a motor stator, the motor stator includes a core, a first hairpin-shaped wire, a second hairpin-shaped wire and a temperature sensor. The core is ring-shaped and includes an insertion side and an extension side to define a rotor accommodating space. A plurality of slots are circumferentially around the rotor accommodating space, each slot extends along a radial direction of the core. The plurality of slots include a temperature sensor accommodating slot, at the insertion side of the core, a radial length of the temperature sensor accommodating slot is greater than a radial length of other slots except the temperature sensor accommodating slot. The first hairpin-shaped wire is located at an end of the temperature sensor accommodating slot away from the rotor accommodating space, the second hairpin-shaped wire is located in the temperature sensor accommodating slot, and the temperature sensor is located between the first hairpin-shaped wire and the second hairpin-shaped wire.

Description

Technical Field

[0001] This invention relates to a hairpin-shaped conductor stator and its motor. Background Technology

[0002] It is known that motor operation control is limited by the measurement deviation of temperature sensors, and can only rely on a large assumed temperature difference for temperature protection, often resulting in overly conservative motor operation control. Currently, motor stators lack suitable space to accommodate temperature sensors, allowing for more accurate measurement of hot spots during motor operation. Therefore, motor manufacturers are actively seeking solutions to reduce the measured temperature difference during motor operation, thereby more effectively controlling motor operation and improving motor performance. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a motor stator that solves the above-mentioned problems. The motor stator includes an iron core, a plurality of slots, a first hairpin-shaped conductor, a second hairpin-shaped conductor, and a temperature sensor. The iron core is annular and defines a rotor receiving space at its center, wherein the iron core includes an insertion side and an extension side. A plurality of slots are located on the iron core, circumferentially surrounding the rotor receiving space, each slot extending radially away from the rotor receiving space along the iron core, and used to allow multiple layers of hairpin-shaped conductors to be inserted into the slot from the insertion side and exit from the extension side. At least one of the plurality of slots is a temperature sensor receiving slot, wherein on the insertion side of the iron core, the temperature sensor receiving slot is longer in radial length than any of the other slots in radial length. The first hairpin-shaped conductor is located at the end of the temperature sensor receiving slot away from the rotor receiving space, and the second hairpin-shaped conductor is located within the temperature sensor receiving slot and adjacent to the first hairpin-shaped conductor. The temperature sensor is located in the temperature sensor receiving slot and is housed between the first hairpin-shaped wire and the second hairpin-shaped wire.

[0004] Another aspect of the invention provides a motor comprising a rotor, an iron core, a first hairpin-shaped wire, and a temperature sensor. The iron core defines a rotor receiving space for accommodating the rotor. A plurality of slots are located on the iron core, circumferentially surrounding the rotor receiving space, each slot extending radially to accommodate multiple layers of hairpin-shaped wires, wherein at least one of the plurality of slots is a temperature sensor receiving slot. The first hairpin-shaped wire is located within the temperature sensor receiving slot, wherein the first hairpin-shaped wire has a bend, a first axial extension, and a second axial extension, the bend connecting the first and second axial extensions. The temperature sensor is adjacent to the first axial extension of the first hairpin-shaped wire, wherein the first axial extension is radially further away from the rotor receiving space than the second axial extension of the iron core.

[0005] Another aspect of the present invention provides a motor stator comprising a ring-shaped iron core, a plurality of slots, a first hairpin-shaped conductor, and a temperature sensor. The plurality of slots are located on the iron core and extend radially outward from the outer circumference of the iron core. At least one of the slots is a temperature sensor receiving slot, comprising an axially adjacent first slot space and a second slot space, wherein the radial length of the first slot space is greater than the radial length of the second slot space. The first hairpin-shaped conductor includes a first axial extension disposed in the first slot space and a second axial extension disposed in the second slot space, the first axial extension being connected to the second axial extension. The temperature sensor is disposed in the first slot space, and the temperature sensor is radially further away from the outer circumference of the iron core than the first axial extension.

[0006] The above description is merely intended to illustrate the problem to be solved by the present invention, its technical means, and its effects. Specific details of the present invention will be described in detail in the following embodiments and related drawings. The drawings are only illustrative of the features and details of the present invention and are used to explain the inventive principles; they do not limit the scope of the invention. Some known and conventional structures and elements are illustrated in the drawings in a simple schematic manner. Attached Figure Description

[0007] Figure 1 A perspective view of a motor according to an embodiment of the present invention is shown;

[0008] Figure 2 A top view schematic diagram of a motor stator according to an embodiment of the present invention is shown;

[0009] Figure 3 Draw Figure 2 Enlarged view of the area within the Chinese border;

[0010] Figure 4 A cross-sectional view of a motor stator according to an embodiment of the present invention is shown;

[0011] Figure 5 A three-dimensional schematic diagram illustrating the insulation structure of an embodiment of the present invention;

[0012] Figure 6 According to Figure 5 Sectional view of section line 6-6; and

[0013] Figure 7 According to Figure 5 The cross-sectional view of section line 7-7.

[0014] [Symbol Explanation]

[0015] 10: Motor

[0016] 100: Motor stator

[0017] 110: Iron core

[0018] 111: Insertion side

[0019] 113: Extended side

[0020] 115: Outer Ring Road

[0021] 120: Slot

[0022] 120a: Temperature sensor housing

[0023] 121a: First slot space

[0024] 123a: Second slot space

[0025] 140: Hairpin wire

[0026] 140a: First hairpin wire

[0027] 141a: Bending section

[0028] 143a: First axial extension

[0029] 145a: Second axial extension

[0030] 140b: Second hairpin wire

[0031] 150: Temperature sensor

[0032] 160: Insulation structure

[0033] 161: R-shaped insulator

[0034] 161a: Enclosed section

[0035] 161b: Open Department

[0036] 163: Type B insulator

[0037] 170: U-shaped insulator

[0038] F: Heat shrink film

[0039] P: Fixative

[0040] R: Circumferential direction

[0041] S: Rotor housing space

[0042] X: Radial

[0043] Y: Axial direction

[0044] L1, L2, L3, L4: Radial length Detailed Implementation

[0045] Please refer to Figure 1The motor 10 includes a motor stator 100 and a motor rotor (not shown) disposed within the motor stator 100. The motor stator 100 is configured to be energized and drive the motor rotor to rotate. When the motor 10 is operating, the temperature of the motor stator 100 and the motor rotor will increase significantly. Even if the motor 10 is cooled (e.g., using a liquid cooling system), there will still be many hot spots inside the motor 10 that cannot be cooled down in time (e.g., hot spots inside the motor stator 100 that cannot be cooled down in time). If the actual temperature of these hot spots cannot be measured when the motor 10 is operating, it will be detrimental to the timely cooling of the motor 10 and may negatively affect the operating performance of the motor 10.

[0046] Please also refer to Figure 1 and Figure 2 The motor stator 100 includes a core 110, a plurality of slots 120, multiple layers of hairpin-shaped wires 140, and a temperature sensor 150. The core 110 is annular and defines a rotor housing space S at its center. The core 110 includes an insertion side 111 (or a first side) and an extension side 113 (or a second side). The plurality of slots 120 are located on the core 110, extending along the axial direction Y and passing through the core 110. The slots 120 are spaced apart in the circumferential direction R and surround the rotor housing space S. Each slot 120 extends radially away from the rotor housing space S along the radial direction X of the core 110. In other words, the slots 120 extend radially X toward the outer circumference 115 of the core 110, and the slots 120 allow the multiple layers of hairpin-shaped wires 140 to enter from the insertion side 111 and exit from the extension side 113. At least one of the multiple slots 120 is a temperature sensor receiving slot 120a.

[0047] Please refer to Figure 3 On the insertion side 111 of the core 110, the radial length of the temperature sensor receiving slot 120a is greater than the radial length of other types of slots 120. For example, the radial length L2 of the temperature sensor receiving slot 120a on the core 110 is greater than the radial length L1 of other slots 120 on the core 110. Therefore, the temperature sensor receiving slot 120a is larger than other slots 120, allowing it to accommodate multiple layers of hairpin wires 140 and temperature sensors 150. Since the temperature sensor 150 is disposed within the temperature sensor receiving slot 120a between the hairpin wires 140 on the core 110, the temperature sensor 150 can more directly and accurately detect the internal temperature of the motor 10 when the motor 10 is running.

[0048] Please also refer to Figure 3 and Figure 4In some embodiments of the present invention, the hairpin-shaped conductor 140 includes a first hairpin-shaped conductor 140a and a second hairpin-shaped conductor 140b. The first hairpin-shaped conductor 140a includes a first axial extension 143a and a second axial extension 145a, wherein the first axial extension 143a and the second axial extension 145a extend along the axial direction Y. The first axial extension 143a is closer to the insertion side 111 and farther from the extension side 113 than the second extension 145a, and the first axial extension 143a is radially closer to the outer circumference 115 of the iron core 110 than the second extension 145a, such that the temperature sensor 150 can be disposed in the space between the first hairpin-shaped conductor 140a and the adjacent second hairpin-shaped conductor 140b, thereby more accurately detecting the internal temperature of the motor 10 during operation. Furthermore, the second hairpin-shaped conductor 140b may be a collimated conductor extending along the axial direction Y. In some embodiments, the second hairpin wire 140b is a bent wire so that the temperature sensor 150 can be co-located between the first hairpin wire 140a and the second hairpin wire 140b.

[0049] In some embodiments of the invention, a first hairpin-shaped conductor 140a includes a bend 141a connected between a first axial extension 143a and a second axial extension 145a. The first axial extension 143a is radially displaced relative to the second axial extension 145a and offset axially. A temperature sensor 150 is located between the first hairpin-shaped conductor 140a and the second hairpin-shaped conductor 140b, such that the first hairpin-shaped conductor 140a and the adjacent second hairpin-shaped conductor 140b jointly house the temperature sensor 150. The temperature sensor 150 is adjacent to the second axial extension 145a axially. In some embodiments of the invention, the relative positions of the first axial extension 143a and the second axial extension 145a can be configured via different degrees of bending of the bend 141a to form a suitable space between the first hairpin-shaped conductor 140a and the second hairpin-shaped conductor 140b to accommodate the temperature sensor 150. Since the internal space of the temperature sensor 150 in the temperature sensor receiving slot 120a can vary through different bends 141a, a variety of sizes and types of temperature sensors 150 can be selected for more accurate temperature detection of the motor 10. Furthermore, the configuration (e.g., tilt angle and position) of the first axial extension 143a can be set through different bends 141a to more securely house the temperature sensor 150.

[0050] In some embodiments of the present invention, the temperature sensor 150 is adjacent to or in direct contact with the first axial extension 143a of the first hairpin-shaped conductor 140a, the first axial extension 143a being parallel to the temperature sensor 150 along the radial X direction, wherein the first axial extension 143a is further away from the rotor receiving space S in the radial X direction of the iron core 110 than the second axial extension 145a. For example, the first hairpin-shaped conductor 140a is located at the end of the temperature sensor receiving groove 120a furthest from the rotor receiving space S, the second hairpin-shaped conductor 140b is located within the temperature sensor receiving groove 120a and adjacent to the first hairpin-shaped conductor 140a, and the temperature sensor 150 is located within the temperature sensor receiving groove 120a and accommodated between the first hairpin-shaped conductor 140a and the second hairpin-shaped conductor 140b. In other words, the first axial extension 143a of the first hairpin conductor 140a is closer to the outer circumference 115 of the core 110 in the radial direction X than the second hairpin conductor 140b.

[0051] In some embodiments of the present invention, the first hairpin conductor 140a may be a neutral conductor or a termination conductor. The neutral conductor or termination conductor is adjacent to the temperature sensor 150, and compared to other conductors, the neutral conductor and termination conductor have a lower voltage relative to ground, which reduces the risk of insulation failure of the temperature sensor 150 and thus improves the reliability of the product.

[0052] In some embodiments of the present invention, the second hairpin-shaped conductor 140b extends collimated along the axial direction Y and is adjacent to or contacts the second axial extension 145a of the first hairpin-shaped conductor 140a, wherein the area of ​​the accommodating space of the temperature sensor 150 is adjacent to the bend 141a and / or the first axial extension 143a. The temperature sensor 150 contacts at least one of the first axial extension 143a and the second hairpin-shaped conductor 140b to directly detect the internal temperature of the motor 10. In some embodiments of the present invention, the second hairpin-shaped conductor 140b, the temperature sensor 150, and the first axial extension 143a are arranged sequentially along the radial direction X of the iron core 110. When the motor 10 is running, the second hairpin-shaped conductor 140b and the first axial extension 143a are clamped on both sides of the temperature sensor 150 in the radial direction X, thereby preventing the temperature sensor 150 from vibrating and interfering with temperature sensing.

[0053] In some embodiments of the present invention, a first axial extension 143a protrudes from the insertion side 111, and a second axial extension 145a protrudes from the extension side 113. The diameter of the temperature sensor receiving groove 120a on the insertion side 111 is larger than the diameter on the extension side 113, so that the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150 can be inserted from the insertion side 111 and fixed within the temperature sensor receiving groove 120a. Specifically, the radial length L3 of the temperature sensor receiving groove 120a on the insertion side 111 is larger than the radial length L4 of the temperature sensor receiving groove 120a on the extension side 113, so that the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150 can simultaneously enter the iron core 110 from the insertion side 111 and be fixed within the temperature sensor receiving groove 120a. In one application example, since the diameter and length L4 of the extension side 113 of the temperature sensor receiving slot 150 are smaller than the diameter and length L3 of the insertion side 111, the extension side 113 of the iron core 110 can be oriented towards the ground, so that the insertion side 111 is farther away from the ground than the extension side 113. Gravity will then secure the first hairpin wire 140a, the second hairpin wire 140b, and the temperature sensor 150 in the temperature sensor receiving slot 120a after assembly.

[0054] Please refer to Figure 3 In one or more embodiments of the present invention, the motor stator 100 includes a heat-shrinkable film F, wherein the heat-shrinkable film F is configured to cover a temperature sensor 150, a portion of a first axial extension 143a, and a portion of a second hairpin-shaped conductor 140b, so as to facilitate the insertion of the first hairpin-shaped conductor 140a, the second hairpin-shaped conductor 140b, and the temperature sensor 150 into a temperature sensor receiving slot 120a. In one application example, the heat-shrinkable film F first covers and heat-shrinks the first hairpin-shaped conductor 140a, the second hairpin-shaped conductor 140b, and the temperature sensor 150, and then inserts the first hairpin-shaped conductor 140a, the second hairpin-shaped conductor 140b, and the temperature sensor 150, which are fixed side by side, into the temperature sensor receiving slot 120a from the insertion side 111 of the core 110. The heat-shrinkable film F facilitates faster and more accurate assembly of the temperature sensor 150 into the temperature sensor receiving slot 120a. Because the heat shrink film F can fix the temperature sensor 150 between the first hairpin wire 140a and the second hairpin wire 140b and set it in the temperature sensor receiving groove 120a, the temperature sensor 150 can be prevented from vibrating in the iron core 110 when the motor 10 is running, thus avoiding negative impact on temperature sensing.

[0055] In other embodiments of the present invention, the temperature sensor 150, the first hairpin-shaped wire 140a, and the second hairpin-shaped wire 140b can be fixed in the temperature sensor receiving groove 120a using adhesive P. Specifically, adhesive P can be filled in the gap between the temperature sensor 150 and the hairpin-shaped wire 140 in the temperature sensor receiving groove 120a. Adhesive P is used to bond and fix the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150 together, which can prevent the vibration of the motor 10 from having a negative impact on temperature sensing.

[0056] Please refer to Figure 4 The temperature sensor receiving groove 120a includes a first groove space 121a and a second groove space 123a, which are adjacent and interconnected along the axial direction Y. The radial length L3 of the first groove space 121a is greater than the radial length L4 of the second groove space 123a, and the spatial dimension of the first groove space 121a is greater than the spatial dimension of the second groove space 123a. A first axial extension 143a and a temperature sensor 150 are disposed within the first groove space 121a, with the temperature sensor 150 being radially further away from the outer circumference 115 of the iron core 110 than the first axial extension 143a. A second axial extension 145a is disposed within the second groove space 123a, and the second axial extension 145a and the temperature sensor 150 are adjacent along the axial direction Y. The first groove space 121a and the second groove space 123a form a stepped inner wall within the temperature sensor receiving groove 120a. In some embodiments of the present invention, the first hairpin-shaped conductor 140a may extend conformally along the stepped inner wall to form a first axial extension 143a and a second axial extension 145a. The first axial extension 143a can support the side of the temperature sensor 150 in the radial direction X, and the second axial extension 145a can support the bottom of the temperature sensor 150 in the axial direction Y. When the motor 10 operates or vibrates during transport, the temperature sensor 150 can have better stability within the iron core 110.

[0057] Please refer to Figures 3 to 7 The motor stator 100 also includes an insulation structure 160 for covering the first hairpin-shaped conductor 140a and the second hairpin-shaped conductor 140b, making them electrically insulated from each other and insulated from the iron core 110. The insulation structure 160 includes an R-shaped insulator 161 (see reference). Figure 6 ) and Type B insulator 163 (please refer to) Figure 7The R-shaped insulator 161 and the B-shaped insulator 163 are connected to each other along the axial direction Y, and can be integrally formed or non-integral formed. Within the first slot space 121a, the R-shaped insulator 161 simultaneously covers the first axial extension 143a of the first hairpin conductor 140a and the second hairpin conductor 140b, thereby isolating the first and second hairpin conductors 140a and 140b from other hairpin conductors 140. Within the second slot space 123a, the B-shaped insulator 163 covers the second axial extension 145a of the first hairpin conductor 140a and the second hairpin conductor 140b, thereby isolating the first and second hairpin conductors 140a and 140b from other hairpin conductors 140.

[0058] In one or more embodiments of the present invention, the motor stator 100 includes an insulating structure 160 and a U-shaped insulator 170, the insulating structure 160 including an R-shaped insulator 161. The R-shaped insulator 161 includes a closed portion 161a and an open portion 161b, wherein the closed portion 161a surrounds two hairpin-shaped conductors 140, and the open portion 161b and the U-shaped insulator 170 together surround a temperature sensor 150, a first axial extension 143a of the first hairpin-shaped conductor 140a and a portion of the second hairpin-shaped conductor 140b, to accommodate the first hairpin-shaped conductor 140a, the second hairpin-shaped conductor 140b and the temperature sensor 150, thus the R-shaped insulator 161 separates the first and second hairpin-shaped conductors 140a, 140b from the other hairpin-shaped conductors 140. Compared to accommodating only two hairpin-shaped wires 140, accommodating the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150 requires more space. Therefore, an open portion 161b with adjustable spacing and a U-shaped insulator 170 are provided to cover the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150. By adjusting the relative positions of the open portion 161b and the U-shaped insulator 170 according to the spatial dimensions of the first hairpin-shaped wire 140a, the second hairpin-shaped wire 140b, and the temperature sensor 150, various sizes of temperature sensors 150 can be accommodated and provided with insulation and heat insulation effects.

[0059] In one or more embodiments of the present invention, the temperature sensor 150 is generally rectangular, and the first hairpin wire 140a also has a rectangular cross-section. The first hairpin wire 140a can make closer direct thermal contact with the temperature sensor 150, thereby increasing the contact area and enhancing the sensitivity of temperature sensing. However, the present invention is not limited thereto, and other shapes and cross-sections of hairpin wires and temperature sensors corresponding to each other can also be implemented.

[0060] In summary, the temperature sensor of the motor provided by this invention is housed in a temperature sensor receiving slot. The motor has temperature sensor receiving slots of different sizes to effectively accommodate the temperature sensor and multiple layers of hairpin-shaped wires. Therefore, during motor operation, the temperature sensor can more accurately measure the actual temperature of hot spots, which is beneficial for controlling the motor temperature and has a positive impact on the motor's operating performance. Different embodiments of this invention are presented only as examples, and their breadth and scope should not be limited by the above description.

Claims

1. A motor stator characterized by, Comprising: a core defining a rotor receiving space at a center of the core, wherein the core comprises an insertion side and an extension side; a plurality of slots on the core and surrounding the rotor receiving space in a circumferential direction, each of the slots extending radially away from the rotor receiving space and configured to receive a plurality of layers of hairpin conductors from the insertion side and out of the extension side; at least one of the plurality of slots is a temperature sensor receiving slot, wherein the temperature sensor receiving slot has a radial length on the insertion side of the core that is greater than a radial length of one of the plurality of slots other than the temperature sensor receiving slot on the insertion side of the core; a first hairpin conductor at an end of the temperature sensor receiving slot away from the rotor receiving space; a second hairpin conductor in the temperature sensor receiving slot adjacent to the first hairpin conductor; and a temperature sensor in the temperature sensor receiving slot and received between the first hairpin conductor and the second hairpin conductor, the first hairpin conductor comprises a bend, a first axial extension, and a second axial extension, the bend connected between the first axial extension and the second axial extension such that the first axial extension is radially displaced from the second axial extension and provides a receiving space for the temperature sensor, the motor stator further comprises an R-shaped insulator, wherein the R-shaped insulator is adjacent to the first axial extension of the first hairpin conductor and the second hairpin conductor.

2. The motor stator of claim 1, wherein, the temperature sensor is in thermal contact with the bend or the first axial extension.

3. The motor stator of claim 1, wherein, Further comprising: a heat shrink film, wherein the heat shrink film covers the temperature sensor and a portion of the first axial extension; or an adhesive, wherein the adhesive fills the temperature sensor receiving slot and covers the temperature sensor and a portion of the first axial extension.

4. The motor stator of claim 1, wherein, Further comprising an R-shaped insulator and a U-shaped insulator, the R-shaped insulator comprising a closed portion and an open portion, wherein the open portion of the R-shaped insulator structure and the U-shaped insulator collectively surround the temperature sensor and the first hairpin conductor and the second hairpin conductor.

5. The motor stator of claim 1, wherein, the radial length of the temperature sensor receiving slot on the insertion side is greater than the radial length of the temperature sensor receiving slot on the extension side.

6. The motor stator of claim 1, wherein, the first hairpin conductor is a neutral conductor.

7. A motor characterized by Comprising: a rotor; a core defining a rotor receiving space to receive the rotor; a plurality of slots on the core and surrounding the rotor receiving space in a circumferential direction, each of the slots extending radially to receive a plurality of layers of hairpin conductors, wherein at least one of the plurality of slots is a temperature sensor receiving slot; a first hairpin conductor in the temperature sensor receiving slot, wherein the first hairpin conductor has a bend, a first axial extension, and a second axial extension, the bend connected between the first axial extension and the second axial extension; and a temperature sensor adjacent to the first axial extension of the first hairpin conductor, wherein the first axial extension is radially displaced from the second axial extension away from the rotor receiving space, The motor further comprises a second hairpin-shaped wire located in the temperature sensor accommodating groove, the second hairpin-shaped wire extending axially and adjacent to a second axial extension of the first hairpin-shaped wire, wherein the motor further comprises an accommodating space for a temperature sensor located between the second hairpin-shaped wire and the first axial extension of the first hairpin-shaped wire, The motor further comprises an R-shaped insulator, wherein the R-shaped insulator is adjacent to the first axial extension of the first hairpin-shaped wire and the second hairpin-shaped wire.

8. The motor of claim 7, wherein, An area of the accommodating space for the temperature sensor is adjacent to the bending portion.

9. The motor of claim 7, wherein, Further comprising: a heat shrinkable film, wherein the heat shrinkable film covers the temperature sensor and a portion of the first hairpin-shaped wire; or a fixing glue, the fixing glue fills the temperature sensor accommodating groove to cover the temperature sensor and a portion of the first axial extension.

10. The motor of claim 7, wherein, The core comprises a first side and a second side, the first axial extension protrudes from the first side, and the second axial extension protrudes from the second side, wherein the diameter of the temperature sensor accommodating groove at the first side is greater than the diameter of the temperature sensor accommodating groove at the second side.

11. The motor of claim 7, wherein, Further comprising an R-shaped insulator and a U-shaped insulator, the R-shaped insulator comprises a closed portion and an open portion, wherein the U-shaped insulator and the open portion of the R-shaped insulator together surround the temperature sensor and the first hairpin-shaped wire and the second hairpin-shaped wire.

12. The motor of claim 7, wherein, The temperature sensor is rectangular, and the first hairpin-shaped wire has a rectangular cross section to closely contact the temperature sensor.

13. A motor stator characterized by, Comprise: a ring-shaped core; a plurality of slots located on the core and extending radially to the outer circumference of the core, at least one of the plurality of slots is a temperature sensor accommodating groove, the temperature sensor accommodating groove comprises axially adjacent first slot space and second slot space, wherein the radial length of the first slot space is greater than the radial length of the second slot space; a first hairpin-shaped wire comprising a first axial extension arranged in the first slot space and a second axial extension arranged in the second slot space, the first axial extension and the second axial extension are connected; a temperature sensor arranged in the first slot space, the temperature sensor is radially farther away from the outer circumference of the core than the first axial extension, and the temperature sensor is axially adjacent to the second axial extension of the first hairpin-shaped wire; and a plurality of second hairpin-shaped wires, wherein the first axial extension of the first hairpin-shaped wire is radially closer to the outer circumference of the core than the plurality of second hairpin-shaped wires.

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