JP2008206302A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator that makes it possible to achieve space saving and further efficiently cool a coil. <P>SOLUTION: In the stator, a thermo module 30 having a Peltier element is disposed at the coil end portion Rce of the coils 12 of a split core 11. Thermally conductive adhesive 20 is applied to the portions of the coils 12 extended from the coil side portions Rcs to the coil end portion Rce. The thermo module 30 is bonded to the coils 12 with the thermally conductive adhesive 20. The coil side portions Rcs, which are areas brought to the highest temperature, are cooled by the thermo module 30 through the thermally conductive adhesive 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a stator of a motor or a generator in which a coil is wound around a core, and more particularly to a cooling measure for the coil.

  In recent years, with the advancement of new technologies such as various electric devices, electric vehicles, hybrid vehicles, robots, etc., the performance required for rotating electric machines (motors and generators) used for them has been advanced. For example, space saving is required in industrial motors, electric vehicles, hybrid vehicles, and the like.

As the space saving progresses, the stator structure is densified, and how to release or cool the heat generated inside is important. For example, Patent Document 1 discloses that a thermoelectric conversion element is disposed on a first cooling panel of a coil portion of a linear motor and an electrothermal conversion element is disposed on a second cooling panel, thereby converting coil heat into electric power. A technique for cooling a coil with electric power is disclosed.
JP 2006-33909 A

  However, in the technique of Patent Document 1, since thermoelectric conversion-electrothermal conversion is uniformly performed, it is difficult to control the coil temperature to a desired temperature. In addition, since two types of elements are necessary, there is a problem that the cost is increased. Furthermore, in a stator with space saving, there is a situation where an element cannot be installed at a part where the temperature is highest. However, in the technique of the above-mentioned Patent Document 1, a countermeasure for such a situation remains unsolved.

  The objective of this invention is providing the stator which can cool a coil efficiently, responding to space saving.

  The stator of the present invention is provided with at least one Peltier element and provided with a heat conductive member extending from at least a part of the coil member to the Peltier element.

  Thereby, it becomes possible to cool the area | region where it is difficult to install a Peltier element in a coil member and the area | region which is a high temperature area | region through a heat conductive member with one kind of element called a Peltier element. That is, it is possible to cool a part that needs to be cooled while using space to cope with space saving.

  By using a heat conductive adhesive for fixing the Peltier element to a part of the stator as the heat conductive member, the heat conduction function from the coil and the fixing of the Peltier element can be realized with a single member, The manufacturing cost can be reduced.

  By further including control means for switching the Peltier element between the cooling mode and the power generation mode according to the temperature detected by the temperature detection means, it is possible to effectively use heat while keeping the coil temperature within an appropriate range.

  Since the Peltier elements are attached to the upper and lower coil end portions and the heat conductive adhesive extends from the coil side portions on both sides to the respective Peltier elements, the empty space can be used more effectively.

  According to the stator of the present invention, the region where the Peltier element is difficult to install and the high temperature region can be cooled via the heat conductive member, and a cooling function corresponding to space saving can be obtained.

  FIG. 1 is a plan view showing a schematic structure of a stator of a rotating electrical machine (motor or generator) in an embodiment. As shown in FIG. 1, the stator is assembled by enclosing a plurality of split cores 11 in an annular shape and enclosing from the outside using a ring member or the like (not shown). A rotor (not shown) provided with permanent magnets is disposed inside the stator shown in FIG. The split core 11 has a yoke portion 11a, a teeth portion 11b that protrudes from the yoke portion 11a toward the rotor, and a flange portion 11c that extends from the tip of the teeth portion 11b. A coil is wound around the tooth portion 11b. In FIG. 1, the coil is not shown in order to make the drawing easy to see.

  2 is a cross-sectional view taken along the line II-II shown in FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. As shown in FIGS. 2 and 3, the coil 12 is wound around the teeth portion 11 b of the split core 11 over several layers. Actually, the coil 12 is hardly wound directly on the split core, and an insulator (insulator) is interposed between the split core 11 and the coil 12, but this is an essential element of the present invention. Therefore, the insulator is not shown in FIGS. The upper and lower regions in FIG. 2 and FIG. 3 among the regions around which the coil 12 is wound are called coil end portions Rce because there are many ends of the coil 12 (winding start and winding end portions). , The left and right regions in FIG. 3 are called coil side portions Rcs because the divided cores 11 are adjacent to each other.

  And in this Embodiment, the thermomodule 30 using the Peltier device which is a thermoelectric conversion element is attached on the coil 12 in the upper and lower coil end part Rce of each division | segmentation core 11. FIG. External power is supplied to the thermo module 30 via electrical wirings 31 and 32. Further, a temperature sensor 40 as temperature detecting means is attached on the coils 12 in the left and right coil side portions Rcs of each divided core 11. Although not shown in FIG. 2, each temperature sensor 40 is connected to either one of the upper and lower thermo modules 30 via a signal line, and the temperature signal detected by the temperature sensor 40 is input to the thermo module 30. Is done.

  In addition, the heat conductive adhesive 20 that is a heat conductive member is applied over the coil end portion Rce and the coil side portion Rcs, that is, over the entire coil 12, and the heat conductive adhesive 20 The thermo module 30 and the temperature sensor 40 are fixed to the coil 12. The heat conductive member of the present invention is not limited to the heat conductive adhesive 20, and a carbon sheet or the like can also be used. However, by using the heat conductive adhesive 20, the function of conducting the heat of the coil 12 to the thermo module 30 (Peltier element) and the function of fixing the thermo module can be realized with one member. Cost can be reduced. Note that, as indicated by a broken line in FIG. 2, a heat conduction member connected to the outside may be provided on the surface side of the thermo module 30.

The heat conductive adhesive 20 is formed by blending a resin solution in which a resin material is dissolved in a solvent with a filler having high heat conductivity to form a coating material. As a heat conductive adhesive, based on epoxy resin, metals such as Au, Ni, Cu, BN, SiC, AlN, Al ₂ O ₃ , SiN, BC, SiO ₂ , MgO, ZnO, TiO _2, etc. What contains ceramics as a filler is suitable. In the present embodiment, since the thermally conductive adhesive is required to be an insulator, it is particularly preferable to use a ceramic material having a high thermal conductivity as a filler.

For example, the thermal conductivity of BN is about 210 (W / m · K), the thermal conductivity of SiC is about 270 (W / m · K), and the thermal conductivity of AlN is about 170 (W / m · K). K), which is extremely higher than the thermal conductivity (around 0.2 W / m · K) of the resin material. In addition, the thermal conductivity of Al ₂ O ₃ is about 36 (W / m · K), which is lower than that of BN and the like, but the price is low, so that an increase in manufacturing cost for mixing the filler is suppressed. There is an advantage that can be.

  FIG. 4 is a diagram for explaining the switching control of the thermo module 30. FIG. 5 is a diagram showing a mode of the thermo module according to the detected temperature. In FIG. 4, although the detailed structure is not shown, the thermo module 30 is configured by connecting several to several tens of Peltier elements in series. Conceptually, as shown in FIG. 4, the p-type element 34 is interposed between the common electrode 33 and the p-electrode 37, and the n-type element 35 is interposed between the common electrode 33 and the n-electrode 36. It is configured. The common electrode 33 is in contact with the coil 12, and the p electrode 37 and the n electrode 36 are open and connected to a power source. When a power supply voltage is applied between the p-electrode 37 and the n-electrode 36, a hole flow is generated in the p-type element 34, and an electron flow is generated in the n-type element 35. Heat is transferred between the 33-p electrodes 37 and between the common electrode 33 and the n-electrode 36. That is, since the endothermic heat is generated in the common electrode 33, the coil 12 is cooled. This heat absorption is transmitted not only to the coil end portion Rce existing immediately below but also to the coil side portion Rcs via the heat conductive adhesive 20, so that the entire coil 12 can be efficiently cooled. On the other hand, the p-electrode 37 and the n-electrode 36 generate heat, but this heat is released to the outside by the heat conducting member shown by the broken line in FIG. However, this heat conducting member may not be provided.

  On the other hand, in the present embodiment, as shown in FIG. 4, a switching element 38 (CMOSFET or the like) is provided as a control means for switching the connection to the p electrode 37 and the n electrode 36 between the power supply side and the common electrode side. It has been. As shown in FIG. 5, when the detected temperature is equal to or higher than a set value Ts (for example, about 200 ° C.) according to the temperature detection signal of the temperature sensor 40 (cooling mode), the switching element 38 is a contact on the power source side. Conducted by P1, the coil 12 is cooled by the above-described action. On the other hand, when the temperature detected by the temperature sensor 40 is lower than the set value Ts (power generation mode), the switching element 38 is switched so as to conduct to the terminal P2. At that time, since the temperature of the p electrode 37 and the n electrode 36 has increased due to the heat generation action so far, the p electrode 37 and the n electrode 36 are in a high temperature state. When the power supply is cut in this state, the flow of holes and electrons in the direction opposite to the direction shown in FIG. 4 occurs due to the temperature difference between the p-electrode 37 and the n-electrode 36 and the common electrode 33. As a result, a potential difference due to the Seepek effect is generated, and power generation is performed. And this electric power is sent to a utilization system, and is utilized as electric power for drive of other members carried in a motor etc. which have a stator as a component, a car etc. in which a motor etc. are arranged.

  According to this embodiment, paying attention to the fact that there is no space for placing the thermo module 30 in the coil side portion Rce that is the hottest, while installing the thermo module 30 in the coil end portion Rce with a small space constraint, Since the heat conductive adhesive 20 is applied from the coil side portion Rcs to the coil end portion Rce, heat generated by the coil side portion Rce can be absorbed quickly, and an increase in coil temperature can be suppressed. Moreover, the coil 12 can be efficiently cooled only by one type of element instead of using the two types of elements of a thermoelectric conversion element and an electrothermal conversion element like the past.

  However, the part where the Peltier element (thermo module 30) of the present invention is disposed may be a part of the stator and does not have to be the coil end portion Rce. For example, a concave portion may be formed in the split core 11 and a Peltier element may be disposed in the concave portion. Although not shown in FIG. 1, a groove or a hole is formed in a fastening ring for fixing each split core 11. May be formed and a Peltier element may be disposed therein.

  Further, if the detected temperature falls below the set value Ts without cooling to a lower temperature than necessary according to the detected temperature of the temperature sensor 40, the p electrode 37 and the n electrode that are in a high temperature state due to the cooling action until then. Since power generation is performed using the temperature difference between the common electrode 33 and the common electrode 33, the power supplied from the outside can be suppressed to the minimum necessary.

(Other embodiments)
In the above embodiment, the thermo module 30 (Peltier element) is arranged in the upper and lower coil end portions Rce. However, the thermo module is arranged only in one of the coil end portions Rce, and one thermo module 30 is provided on both sides. The coil side portion Rcs may be cooled via the sleeping conductive adhesive 20. In that case, although the cooling function and the power generation function are lowered, the basic effects of the above-described embodiment can be exhibited.

  The structure of the embodiment of the present invention disclosed above is merely an example, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The stator of the present invention can be used for motors and generators disposed in industrial motors, hybrid vehicles, electric vehicles, fuel cell vehicles, robots, and the like.

It is a top view which shows the schematic structure of the stator in embodiment. It is sectional drawing in the II-II line | wire shown in FIG. It is sectional drawing in the III-III line | wire shown in FIG. 4 is a diagram for explaining switching control of a thermo module 30. FIG. It is a figure which shows the mode of the thermomodule according to detected temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Divided core 11a Yoke part 11b Teeth part 11c Eaves part 12 Coil 20 Thermally conductive adhesive (thermally conductive member)
30 Thermo module 31, 32 Electrical wiring 33 Common electrode 34 P-type element 35 N-type element 36 N-electrode 37 P-electrode 38 Switching element (control means)
40 Temperature sensor P1, P2 Contact point Rce Coil end part Rcs Coil side part

Claims (4)

A core composed mainly of a magnetic material;
A coil member wound around the core;
At least one Peltier element;
A thermally conductive member extending from at least a portion of the coil member to the Peltier element;
Comprising a stator. The stator according to claim 1, wherein
The said heat conductive member is a stator which is a heat conductive adhesive which fixes the said Peltier device to a part of stator. The stator according to claim 1 or 2,
Temperature detecting means for detecting the coil temperature;
Control means for switching the Peltier element between a cooling mode and a power generation mode in accordance with the detected temperature of the temperature detecting means;
The stator further comprising: In the stator according to any one of claims 1 to 3,
The Peltier element is attached to upper and lower coil end portions of the coil member,
The heat conductive adhesive extends from the coil side portions on both sides of the coil member to each Peltier element.

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