Stator for rotating electric machine

Abstract

A stator for a rotating electrical machine is provided with: a stator core; a coil inserted into the stator core; a conductor welded to the coil; a temperature sensor that measures the temperature of the stator core via the conductor; and a clip for attaching the temperature sensor to the conductor, in which the conductor is provided with a welding part that is welded to the terminal of the coil and a part to be measured that is measured by the temperature sensor. The measured part is provided with a first surface on which the temperature sensor is mounted and a second surface which is a surface opposite to the first surface, and the clip is provided with a leg part which is locked on the second surface side and a holding part which holds the temperature sensor on the first surface side. The first surface is opposite to one end surface of the stator core in the axial direction, and the temperature sensor is arranged between the first surface and the end surface.

Description

Technical Field

[0001] The present invention relates to a stator of a rotating electric machine. Background Art

[0002] To prevent motor burnout, the applied current is reduced if the coil temperature overheats. The temperature used for current control is determined by measuring the coil temperature during operation using a temperature sensor. Errors caused by measurement variations and other factors are corrected for the measured temperature.

[0003] The stator of a motor has a terminal block structure. Mounting a temperature sensor for measuring coil temperature on this terminal block offers the advantage of simplifying the stator coil. Regarding such a temperature sensor mounting structure, for example, Patent Document 1 below discloses a stator having a structure in which a thermistor holder is mounted on a conductive portion without tools. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Publication No. 2021-526345 Summary of the Invention Problems to be solved by the invention

[0005] In the technology described in Patent Document 1, the temperature sensor is installed farther from the coil than in the past, which causes a problem in that a numerical deviation easily occurs between the actual coil temperature and the temperature measured by the temperature sensor. Technical means to solve the problem

[0006] A stator of a rotating electric machine comprises: a stator core; a coil inserted into the stator core; a conductor welded to the coil; a temperature sensor for measuring the temperature of the stator core via the conductor; and a clamp for mounting the temperature sensor on the conductor, wherein the conductor comprises a welding portion welded to a terminal of the coil and a measured portion measured by the temperature sensor, the measured portion comprising a first surface on which the temperature sensor is mounted and a second surface which is a surface opposite to the first surface, the clamp comprising a leg latched on the second surface side and a retaining portion for retaining the temperature sensor on the first surface side, the first surface being axially opposite to an end surface of the stator core, and the temperature sensor being arranged between the first surface and the end surface. Effects of the Invention

[0007] According to the present invention, it is possible to provide a stator for a rotating electrical machine that reduces the deviation between the actual coil temperature and the temperature measured by the temperature sensor, thereby improving the output of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an overall view of a stator and a view of a terminal block of a rotating electrical machine according to one embodiment of the present invention. Figure 2 This is an explanatory diagram of a conductor and a clip according to one embodiment of the present invention. Figure 3 This is an explanatory diagram of a temperature sensor and a clip according to one embodiment of the present invention. Figure 4 This is an explanatory diagram of the installation position of a temperature sensor in a motor according to one embodiment of the present invention. Figure 5 This is the first modification example. Figure 6 This is the second modification. DETAILED DESCRIPTION

[0009] The following describes embodiments of the present invention with reference to the accompanying drawings. The following description and drawings are examples for illustrating the present invention, and appropriate omissions and simplifications have been made for clarity of description. The present invention may also be implemented in various other forms. Unless otherwise specified, each component may be single or multiple.

[0010] To facilitate understanding of the invention, the positions, sizes, shapes, and ranges of the components shown in the drawings may not necessarily represent their actual positions, sizes, shapes, and ranges. Therefore, the present invention is not necessarily limited to the positions, sizes, shapes, and ranges disclosed in the drawings.

[0011] (One embodiment and overall structure) ( Figure 1 ) Figure 1 (a) is the overall three-dimensional diagram of the stator. Figure 1 (b) is Figure 1 (a) is an enlarged view of a terminal block 18. A stator included in a motor mounted on a vehicle includes a stator core 2 and a plurality of coils 17. The plurality of coils 17 are electrically connected to the terminal block 18.

[0012] The stator is held within the motor housing, and a plurality of coils 17 are inserted into a plurality of slots in the stator core 2. A terminal block 18 is formed by molding the conductive body 8 with a resin portion 19, and the terminal block 18 has a plurality of soldering portions 7. A clip 15 for attaching a temperature sensor to the conductive body 8 is attached to the terminal block 18.

[0013] The conductor 8 is made of copper, for example. The clip 15 is made of stainless steel or iron-based spring steel, for example.

[0014] ( Figure 2 ) Figure 2(a) is a diagram showing a clip 15 mounted on a conductor 8. Figure 2 (b) is an explanatory diagram of the structure of the clip 15. The clip 15 includes a leg portion 15a, a frame portion 15b, and a holding portion 15c. The temperature sensor 12 is connected to a temperature sensor lead wire 12b covered by a temperature sensor glass tube 12a.

[0015] Clip 15 is attached to hold temperature sensor 12 and place it in contact with conductor 8. Temperature sensor 12 measures the temperature of stator core 2 via conductor 8. Temperature sensor 12 is held by retaining portion 15c on the surface opposite to the surface in contact with conductor 8, while the side surfaces of temperature sensor 12 are covered by frame portion 15b. This structure of clip 15 ensures stable position of temperature sensor 12 relative to conductor 8.

[0016] Furthermore, the width, depth, and height of the leg portion 15a of the clip 15 are smaller than those of the frame portion 15b and the retaining portion 15c relative to the conductor 8. Therefore, by locking the leg portion 15a side at the insulating distance 20 from the cover 5 (described later), space can be effectively utilized, thereby contributing to miniaturization.

[0017] ( Figure 3 ) Figure 3 (a) is a cross-sectional view showing the relationship between the temperature sensor 12 and the conductor 8. Figure 3 (b) is Figure 3 (a) shows another example of the shape of the measured portion 9. In addition, only a part of the leg portion 15a of the clip 15 is shown in the figure.

[0018] The clip 15 is attached to the conductor 8 via its leg portion 15a, securing the temperature sensor 12 in contact with the conductor 8. The conductor 8 includes a portion to be measured 9, which is a location where the temperature sensor 12 measures the temperature. The portion to be measured 9 includes a first surface 9a and a second surface 9b. The temperature sensor 12 is disposed between the first surface 9a and one end surface 2a of the stator core 2.

[0019] The first surface 9a is mounted with a temperature sensor 12 and in contact with the temperature sensor 12. Furthermore, the first surface 9a is axially opposed to one end surface 2a of the stator core 2. The second surface 9b is the surface of the measured portion 9 on the opposite side from the first surface 9a, and is secured with a leg 15a of the clip 15.

[0020] During the forming process of the conductor 8 by shearing, collapsed edges and burrs (or curling edges) are formed at each corner of the cross section. Therefore, when viewed from the cross section, the measured portion 9 has burrs 9d at each corner on the first surface 9a side, and has a bent portion 9c with a collapsed edge shape at each corner on the second surface 9b side. When the clip 15 is installed on the measured portion 9, the foot 15a slides along the surface of the measured portion 9 to the second surface 9b side and is clamped by the bent portion 9c, thereby being fixed. In this way, the clamping process of the clip 15 becomes easier by clamping the foot 15a with the bent portion 9c. In addition, by preventing the burrs 9d from participating in the clamping of the clip 15, the occurrence of contamination can be suppressed, and the welding can be stabilized.

[0021] Furthermore, when welding the clamp 15, the burr 9d side serves as the contact surface during welding, thereby ensuring a large contact area between the measured portion 9 and the clamp 15. This promotes heat conduction between the conductors during welding and suppresses variations in welding penetration.

[0022] Alternatively, the first surface 9a of the portion to be measured 9 may have a curved portion 9c formed on one side and a burr 9d formed on the other side. Similarly, the second surface 9b of the portion to be measured 9 may have a curved portion 9c formed on one side and a burr 9d formed on the other side. Even in this case, when securing the clip 15, by first hooking one leg 15a on the burr 9d and then securing the other leg 15a from the curved portion 9c, the clip 15 can be easily attached to the portion to be measured 9 and contamination can be minimized.

[0023] Furthermore, the conductor 8 may be formed by stamping or forming a flat wire. Furthermore, the collapsed edge shape of the curved portion 9c of the conductor 8 on the first surface 9a or the second surface 9b of the leg portion 15a may be formed only on one of the corners or only on a portion.

[0024] ( Figure 4 ) In motor 100, rotor 3 is rotatably held on the inner circumference of stator core 2 via a gap. Rotor 3 comprises a rotor core fixed to shaft 4, permanent magnets, and a non-magnetic backing plate. Motor 100 includes a pair of end brackets equipped with bearings 6, and shaft 4 is rotatably held by these bearings 6.

[0025] A rotary transformer is provided on the shaft 4 to detect the position and rotation speed of the poles of the rotor 3. The output from the rotary transformer is collected by the control circuit. Based on the collected output information, the control circuit outputs a control signal to the drive circuit. The drive circuit outputs a drive signal based on the control signal to the power module. The power module performs switching operations according to the control signal and converts the DC power supplied from the battery into three-phase AC power. The three-phase AC power is supplied to the stator winding, generating a rotating magnetic field in the stator. The frequency of the three-phase AC current is controlled according to the output value of the rotary transformer, and the phase of the three-phase AC current relative to the rotor 3 is also controlled according to the output value of the rotary transformer.

[0026] The housing includes a first housing 13 and a second housing 14. The first housing 13 is used to fix the stator core 2 to the motor 100. The second housing 14 is used to form a refrigerant flow path 16 with the first housing 13.

[0027] The cover 5 is fixed to the first housing 13 and the second housing 14 by the fastener 10. Figure 3 ) A potential difference exists between the cover 5 and the clip 15, so the measured portion 9 and the cover 5 face each other while maintaining a spatial insulation distance 20. By attaching the clip 15 so that the leg 15a engages with the second surface 9b, the spatial insulation distance 20 can be appropriately ensured while reducing the protrusion of the clip 15 toward the cover 5, thereby contributing to miniaturization.

[0028] Conductor 8 is connected to the terminal of coil 17 by welding via welding portion 7. Welding portion 7 is provided at a position opposite to the position where temperature sensor 12 is provided in the axial direction with respect to conductor 8, thereby contributing to miniaturization.

[0029] This configuration places temperature sensor 12 closer to stator core 2, allowing the value measured by temperature sensor 12 to be closer to the true temperature of stator core 2, thereby reducing measurement errors. Furthermore, by controlling the temperature margin that should have been reserved, this error is reduced, allowing for greater power to be applied, thereby contributing to increased output of motor 100.

[0030] (First Modification) ( Figure 5 ) The temperature sensor 12 may be attached to the measured portion 9 by, for example, a heat shrink tube, adhesive, or other fasteners, without using the clip 15. This can reduce the number of components.

[0031] (Second Modification) ( Figure 6 ) The measured portion 9 is a portion of the conductor 8, but a portion of the coil 17 may be extended to serve as the measured portion 9. This eliminates the need for the conductor 8 connected to the coil 17 by welding, thus contributing to a reduction in the number of components.

[0032] According to the embodiment of the present invention described above, the following effects are achieved.

[0033] (1) A stator for a rotating electric machine comprises: a stator core 2; a coil 17 inserted into the stator core 2; a conductor 8 welded to the coil 17; a temperature sensor 12 for measuring the temperature of the stator core 2 via the conductor 8; and a clip 15 for attaching the temperature sensor 12 to the conductor 8, wherein the conductor 8 comprises a welding portion 7 welded to a terminal of the coil 17 and a measured portion 9 to be measured by the temperature sensor 12. The measured portion 9 comprises a first surface 9a to which the temperature sensor 12 is attached and a second surface 9b opposite to the first surface 9a. The clip 15 comprises a leg portion 15a engaged with the second surface side 9b and a retaining portion 15c for retaining the temperature sensor 12 on the first surface side 9a. The first surface 9a is axially opposed to one end surface 2a of the stator core 2, and the temperature sensor 12 is disposed between the first surface 9a and the end surface 2a. Thus, a stator for a rotating electric machine can be provided that achieves improved output of a motor 100.

[0034] (2) The weld portion 7 is provided on the side opposite to the position where the temperature sensor 12 is provided with respect to the conductor 8 in the axial direction. This contributes to miniaturization of the motor 100.

[0035] (3) The measured portion 9 has a bent portion 9c at each corner on the second surface 9b side when viewed in cross section. This can suppress contamination during assembly of the clip 15 and stabilize welding.

[0036] (4) The bent portion 9c is a collapsed shape formed when shearing the conductor 8. This can suppress contamination when assembling the clip 15 and stabilize welding.

[0037] (5) The leg portion 15a is locked by the bent portion 9c. This can suppress contamination during assembly of the clip 15 and stabilize welding.

[0038] The present invention is not limited to the above-described embodiments, and various modifications and other configurations can be combined without departing from the spirit thereof. The present invention is not limited to a configuration having all the configurations described in the above-described embodiments, and also includes a configuration in which a portion of the configuration is deleted. Explanation of symbols

[0039] 2: Stator core, 2a: End surface, 3: Rotor, 4: Shaft, 5: Cover, 6: Bearing, 7: Welding portion, 8: Conductor, 9: Measured portion, 9a: First surface, 9b: Second surface, 9c: Bend portion, 9d: Burr, 10: Fastener, 12: Temperature sensor, 12a: Temperature sensor glass tube, 12b: Temperature sensor lead, 13: First housing, 14: Second housing, 15: Clip, 15a: Leg, 15b: Frame, 15c: Holding portion, 16: Refrigerant flow path, 17: Coil, 18: Terminal block, 19: Resin portion, 20: Spatial insulation distance, 100: Motor.

Claims

1. A stator of a rotating electrical machine, comprising: stator core; a coil inserted into the stator core; an electrical conductor welded to the coil; a temperature sensor for measuring the temperature of the stator core via the electrical conductor; as well as a clip for mounting the temperature sensor on the electrical conductor, The stator of the rotating electrical machine is characterized in that: The conductor includes a welding portion welded to the terminal of the coil and a portion to be measured by the temperature sensor. The measured portion includes a first surface on which the temperature sensor is mounted and a second surface opposite to the first surface. The clip includes a leg portion locked on the second surface side and a holding portion holding the temperature sensor on the first surface side. The first surface is opposite to one end surface of the stator core in the axial direction, The temperature sensor is disposed between the first surface and the end surface.

2. The stator of a rotating electrical machine according to claim 1, wherein The welding portion is provided on the side opposite to the installation position of the temperature sensor with reference to the conductor in the axial direction.

3. The stator of a rotating electrical machine according to claim 1, wherein The measured portion includes a curved portion at each corner on the second surface side when viewed in cross section.

4. The stator of a rotating electrical machine according to claim 3, wherein: The bent portion is a collapsed shape formed when the conductor is sheared.

5. The stator of a rotating electrical machine according to claim 3, wherein: The leg is locked by the bent portion.

Images