JP3821341B2 - Rotating electric machine with temperature sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine with a temperature sensor.
[0002]
[Prior art]
In a conventional rotating electric machine with a temperature sensor, a temperature sensor is generally provided at a coil end. This is because it is difficult to insert the temperature sensor into the slot, the coil temperature becomes considerably high among the temperatures of each part of the rotating electrical machine, and if the coil temperature exceeds a predetermined level, the insulating resin of the coil This is because the electrical insulation properties deteriorate due to deterioration.
[0003]
[Problems to be solved by the invention]
However, the conventional temperature sensor attached to the coil end has a problem that it is not easy to secure the mechanical fixing strength of the temperature sensor, and the heat transfer resistance between the coil end and the temperature sensor is large. There were two problems to be solved that further improvement in responsiveness was necessary. This will be described in more detail below.
[0004]
First, the mechanical fixing of the temperature sensor will be described. After a coil (for example, a stator coil) is wound around a core (for example, a stator core), the temperature sensor is bonded to the coil with an adhesive having good heat resistance. However, since the coil end vibrates due to cooling air, electromagnetic vibration, etc., the temperature sensor is repeatedly applied to the adhesive layer due to the fact that thermal stress repeatedly acts on the adhesive layer due to the difference in thermal expansion coefficient between the temperature sensor and the coil end. May peel off from the coil end.
[0005]
In general, a thermistor having a substantially flat plate shape is used as the temperature sensor, but the transition conductor of the coil end to which the temperature sensor is bonded is usually circular in cross section. It is difficult to increase the facing area of the contact boundary between the two, and the average thickness of the contact boundary made of the adhesive layer is also large, which makes it easy to reduce the heat transfer resistance between the temperature sensor and the coil end. There wasn't. If the heat transfer resistance between the two is large, the remaining part of the surface area of the temperature sensor is cooled by the cooling air flow, which increases the temperature detection error between the coil temperature and the temperature sensor detection temperature. This leads to a problem that a delay in tracking the temperature detected by the temperature sensor with respect to the rise in coil temperature occurs.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine having a temperature sensor excellent in mechanical adhesion and heat transfer with a coil end.
[0007]
[Means for Solving the Problems]
The present invention relates to a slot conductor portion composed of a forward conductor portion and a return conductor portion alternately inserted into each slot of the core, and the same side end of the forward conductor portion and the return conductor portion formed integrally with the slot conductor portion. In a rotating electrical machine with a temperature sensor having a coil conductor having a connecting conductor part connecting the parts and the temperature sensor being arranged at the coil end, the coil end has a posture in which the thickness direction is substantially equal to the radial direction The transition conductor portion made of a conductor plate extended in is laminated in the radial direction of the core, and the transition conductor portion has a bent end portion that is bent and overlapped in the radial direction of the core, The temperature sensor is characterized in that it is folded and clamped between a pair of the conductor plates at the bent end portion that is bent and extends adjacent to the radial direction of the core.
According to the wave winding of the rotating electrical machine of the present invention, the temperature sensor is folded and clamped between a pair of conductor plates extending adjacent to the core in the radial direction and forming a part of the coil end. A rotating electrical machine having a temperature sensor excellent in mechanical adhesion and heat transfer between the ends can be realized.
[0008]
More specifically, in this configuration, the coil end is formed by laminating a plurality of transition conductor portions made of a conductor plate extending in a posture in which the thickness direction substantially coincides with the radial direction in the core radial direction. Therefore, first, if a temperature sensor is arranged between a pair of conductor plates adjacent to each other in the radial direction of the core, the temperature sensor is sandwiched by these conductor plates, so that it can be favorably mechanically supported by the conductor plates. Moreover, since the temperature sensor is in good contact with both conductor plates, the heat transfer resistance between them can be reduced. Furthermore, since almost the entire surface of the temperature sensor is covered with the conductor plate, the cooling air flow or the like does not hit the temperature sensor, and the temperature sensor is not unnecessarily cooled by the cooling air flow. In addition, since the conductor plates adjacent in the radial direction are fixed in the slot so as not to be relatively displaced in the radial direction, when a temperature sensor is interposed between the pair of conductor plates adjacent in the radial direction of the coil end, these conductor plates are The temperature sensor is elastically deformed in the radial direction, and as a reaction force, the temperature sensor is strongly pressed by both conductor plates, the mechanical fixing property is further improved, and the heat transfer resistance is further reduced.
[0009]
According to the configuration of the second aspect, in the rotating electric machine with the temperature sensor according to the first aspect, the pair of conductor plates sandwich the temperature sensor with a predetermined clamping pressure, so that it is not necessary to use an expensive heat-resistant adhesive. As a result, a reduction in material cost and work man-hours and a reduction in heat transfer resistance can be realized.
[0010]
According to the third aspect of the present invention, in the rotary electric machine with the temperature sensor according to the first or second aspect, the temperature sensor has a substantially flat plate shape in which the pair of main surfaces are in close contact with the two conductor plates. Further reduction in resistance and good clamping of the temperature sensor can be realized .
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the invention are illustrated by the following examples.
[0012]
[Example 1]
An embodiment of a three-phase motor in which the wave winding of the present invention is applied to a stator winding will be described. 1 shows a plan view of the stator of the motor, FIG. 2 shows a front view, FIG. 3 shows a plan view of the stator as viewed from a different side from FIG. 1, and FIG. FIG. 5 to FIG. 12 show a stator coil creation procedure.
[0013]
Reference numeral 1 denotes a stator core in which thin plate steel plates are laminated, and has a large number of slots opened on the inner diameter side. In each slot, a star-connected three-phase two-layer wave-type stator coil (hereinafter also simply referred to as a coil) 2 is wound. A plate-like wedge 4 for preventing the protrusion is fitted. An insulator 3 that insulates the coil 2 from the core 1 is inserted in the inner periphery of the slot.
[0014]
The coil 2 has a linear slot conductor portion 21 inserted into a slot and a transition conductor portion 22 formed integrally with the slot conductor portion 21, and both ends of the transition conductor portion 22 are sandwiched by two slots. They are individually connected to the same end of the pair of slot conductors 21 inserted into the slots on both sides. As shown in FIG. 1, the coil 2 is composed of three phase coils 2a, 2b, and 2c. As shown in FIG. 5, the slot conductor portion 21 is formed from the start ends 23 to 25 of the phase coils 2a, 2b, and 2c. It consists of a forward conductor portion 21a extending in the forward direction, and a return conductor portion 21b extending in the return direction approaching from the start ends 23 to 25 of the phase coils 2a, 2b, 2c. Therefore, the coil end portions 2d on both sides of the slot are precisely constituted by the end portions on both sides of the slot conductor portion 21 and the transition conductor portions 22, and each of the transition conductor portions 22 is formed of a slot conductor portion as shown in FIG. Each of the bent end portions 22a is bent in the circumferential direction with respect to 21 and is bent at the center portion of the crossover conductor portion 22 and overlapped in the radial direction. Hereinafter, the coil 2 will be described in more detail.
[0015]
As shown in FIG. 5, the coil 2 has six coil conductors 201 to 206 arranged in parallel at a distance of one slot pitch, and the coil conductors 201 and 204 constitute the phase coil 2 a, and the coil conductor 203 , 206 constitute the phase coil 2b, and the coil conductors 202, 205 constitute the phase coil 2c. Each of the coil conductors 201 to 206 has a substantially square cross-sectional shape that is thin in the radial direction of the stator core 1 and wide in the circumferential direction.
[0016]
The nth (n is an integer) slot conductor portion 21 of the mth (m is an integer) coil conductor is the (n−1) th or (n + 1) th slot conductor portion 21 of the mth coil conductor. Are accommodated in slots that are 180 degrees apart from the slots in which the electrical angle is accommodated. In addition, the slots separated by the three-slot pitch are accommodated together with the slot conductor portion 21 of the m-3th or m + 3th coil conductor.
[0017]
Further, among the starting ends of the six coil conductors 201 to 206, the second, fourth, and sixth starting ends are short-circuited with each other to become a neutral point, and the remaining first, third, and fifth starting ends are three-phase star types. It forms the terminal of each connected phase coil 2a, 2b, 2c.
A specific method for manufacturing the coil conductors 201 to 206 will be described with reference to the manufacturing procedure shown in FIGS.
[0018]
First, as shown in FIG. 5, the six coil conductors 201 to 206 are arranged in parallel by being separated by one slot pitch. The slot conductor portion 21 and the transition conductor portion 22 are each formed in a straight strip shape, and the transition conductor portion 22 is obliquely provided with respect to the slot conductor portion 21 at an appropriate angle (here, about 60 degrees). Reference numeral 23 denotes a start end of the coil conductor 201, 24 denotes a start end of the coil conductor 203, 25 denotes a start end of the coil conductor 205, 26 denotes a start end of the coil conductor 202, and 27 denotes a start end of the coil conductor 204. Yes, 28 is the starting end of the coil conductor 206.
[0019]
Next, as shown in FIG. 6, the first six crossing conductor portions 22 counted from the start ends 23 to 28 of the coil conductors 201 to 206 are the first slot conductors at the center (shown by broken lines in FIG. 5). Bend so that part 21 is at the bottom (by valley fold). In FIG. 5, the first slot conductor portion 21 and the next slot conductor portion 21, which are counted from the start ends 23 to 28 of the respective coil conductors 201 to 206, are formed at a three-slot pitch, thereby the coil conductor 201. The second slot conductor portion 21 of the coil conductor 204 overlaps with the first slot conductor portion 21 of the coil conductor 204, and similarly, the second slot conductor portion 21 of the coil conductor 202 is the first slot conductor portion 21 of the coil conductor 205. The second slot conductor portion 21 of the coil conductor 203 overlaps the first slot conductor portion 21 of the coil conductor 206.
[0020]
Next, as shown in FIG. 7, the second six crossing conductor portions 22 counted from the start ends 23 to 28 of the coil conductors 201 to 206 are arranged at the center portion (indicated by broken lines in FIG. 6). The slot conductor portion 21 is bent so as to be above the third slot conductor portion 21 (in a mountain fold, that is, in the same rotational direction as the first bending direction in the present invention). As a result, the third slot conductor portion 21 of the coil conductor 201 overlaps below the second slot conductor portion 21 of the coil conductor 204, and the third slot conductor portion 21 of the coil conductor 202 is similarly connected to the coil conductor 205. The third slot conductor portion 21 of the coil conductor 203 overlaps below the second slot conductor portion 21 of the coil conductor 206. As a result, the third slot conductor 21 is reasonably accommodated at the same depth (deepest position) in the slot as the first slot conductor 21.
[0021]
Hereinafter, as shown in FIG. 8, the six coil conductors 201 to 206 are accommodated in two layers in each slot by sequentially bending the valley fold, the mountain fold, and the valley fold in the same rotational direction. As a result, by bending the number of times of subtracting 1 from the number of magnetic poles of the rotor, each of the coil conductors 201 to 206 makes one round, and a coil for two turns is formed in two layers in the slot.
[0022]
Next, as shown in FIG. 9, the sheet is bent in the opposite direction of rotation (that is, the final folding of the first two turns is a valley fold so that it is again a valley fold). Thereby, the subsequent slot conductor portions 21 can be smoothly arranged in the third and fourth layers in the slot.
Hereinafter, as shown in FIG. 10, the six coil conductors 201 to 206 are accommodated in four layers in each slot by sequentially bending the valley fold, the mountain fold, the valley fold, and the first two turns in the opposite direction of rotation. . As a result, the coil conductors 201 to 206 perform the next round by bending the number of times obtained by subtracting 1 from the number of rotor magnetic poles, and coils for four turns are formed in four layers in the slot. . Thereafter, the necessary number of turns is produced by the same procedure as described above.
[0023]
Next, after making a predetermined turn, as shown in FIG. 10, the final transition conductor portion 22b of the coil conductors 201 to 206 is about half the length of the conventional transition conductor portion 22, and the coil The last transition conductor portion 22b of the conductors 204 to 206 is obliquely arranged in a line symmetrical direction with the other transition conductor portion 22 and the last transition conductor portion 22b. As a result, as shown in FIG. 12, the end portions of the last transition conductor portions 22b of the coil conductors 201 and 204 overlap, the end portions of the last transition conductor portions 22b of the coil conductors 202 and 205 overlap, and the coil conductors 203 and 206 The leading end portion of the final crossover conductor portion 22b overlaps, and a three-phase stator coil is formed by welding these overlapping portions. More specifically, the coil conductors 201 to 203 are bent as shown in FIG. 11, and then the coil conductors 204 to 206 are bent as shown in FIG. do it.
[0024]
Next, the coil 2 manufactured as described above is inserted into each slot of the stator core 1, and next or before the slot is inserted, the starting ends of the coil conductors 202, 204, 206 are short-circuited to obtain a neutral point.
Next, attachment of the temperature sensor 5 that characterizes this embodiment will be described below with reference to FIGS.
[0025]
The temperature sensor 5 is formed of a substantially thin disc-like thermistor, and is folded into a bent end portion 22 a formed of the tip end portion in the axial direction of one transition conductor portion 22. This folding may be performed at the time of manufacturing the corresponding bent end 22a in the coil manufacturing process shown in FIGS. 5 to 12, or may be inserted after the bent end 22a is manufactured.
In this embodiment, the temperature sensor 5 is simply sandwiched between the bent end portions 22a and does not use an adhesive, but the bent end portion 22a clamps the temperature sensor 5 so that it is mechanically firmly fixed. The heat transfer resistance from the temperature sensor 5 to the bent end 22a can also be reduced.
[0026]
A motor using the stator with the temperature sensor 5 is shown in FIG.
6 is a housing, 7 is a shaft, 8 is a rotor having a field coil 9, and 10 is a lead wire for a three-phase stator coil 2.
In this embodiment, the lead wire of the temperature sensor 5 is drawn in the same direction as that of the lead wire 10 of the three-phase stator coil 2, that is, the rear direction, so that the terminal processing becomes easy.
[0027]
[Modification]
In the above embodiment, the temperature sensor 5 is folded into the bent end portion 22a of the crossover conductor portion 22. For example, the temperature sensor 5 is inserted between a pair of crossover conductor portions 22 and 22 that are adjacent in the radial direction at the point C shown in FIG. The same effect can be achieved.
The coil conductors 201 to 206 may be bent at the time of bending to form the transition conductor part 22 instead of obliquely providing the transition conductor part 22 with respect to the slot conductor part 21 in advance.
[0028]
The six coil conductors 201 to 206 make, for example, a coil for even turns (coil group referred to in the present invention), and the other six coil conductors, for example, a coil for even turns (coil group referred to in the present invention). Alternatively, the coil groups may be connected to each other by a method of welding the overlapping conductor portions 22 having a half length.
The coil conductors 201 and 204, the coil conductors 202 and 205, the coil conductors 203 and 206, and the above-described final transition conductor portions may be bent and formed, and then the coils may be formed in order from FIG.
[0029]
Furthermore, instead of short-circuiting the starting ends of the coil conductors 202, 204, 206, it is possible to make a delta connection.
[Brief description of the drawings]
FIG. 1 is a plan view of a stator in an embodiment of a three-phase motor in which a wave winding of the present invention is applied to a stator winding.
FIG. 2 is a front view of the stator shown in FIG.
3 is a plan view of the stator shown in FIG. 1 as seen from a different direction from FIG. 1. FIG.
4 is a cross-sectional view in the axial direction of a motor using the stator shown in FIG. 3;
FIG. 5 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2;
6 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2. FIG.
7 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2. FIG.
8 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2. FIG.
FIG. 9 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2;
FIG. 10 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2;
FIG. 11 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2;
12 is a process diagram showing a procedure for creating the stator coil shown in FIGS. 1 and 2. FIG.
[Explanation of symbols]
1 is a stator core, 2 is a coil, 5 is a temperature sensor, 21 is a slot conductor, 22 is a crossover conductor, 22a is a bent end, and 22b is a final crossover conductor.

Claims (3)

A slot conductor portion composed of a forward conductor portion and a return conductor portion that are alternately inserted into each slot of the core and an end portion on the same side of the forward conductor portion and the return conductor portion that are formed integrally with the slot conductor portion. In a rotating electrical machine with a temperature sensor having a coil conductor with a transition conductor portion and a temperature sensor disposed at the coil end,
The coil end is formed by laminating the transition conductor portion formed of a conductor plate extending in a posture in which the thickness direction substantially coincides with the radial direction in the radial direction of the core,
The transition conductor portion has a bent end portion that is bent and overlapped in the radial direction of the core,
The temperature sensor, the rotary electric machine, characterized by being tightened is folded into a pair of said conductor plates of the bent end portion extending adjacent to a radial direction of the core by bending. In the rotary electric machine with a temperature sensor according to claim 1,
The pair of conductor plates clamps the temperature sensor with a predetermined clamping pressure without using an adhesive, and is a rotating electric machine with a temperature sensor. In the rotary electric machine with a temperature sensor according to claim 1 or 2,
The rotary electric machine with a temperature sensor, wherein the temperature sensor has a substantially flat plate shape in which a pair of main surfaces are in close contact with the two conductor plates .

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