JP5916491B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as an electric motor or a generator used in a drive device for a hybrid vehicle or an electric vehicle.

  Conventionally, an electric motor or a rotating electric machine such as a generator is incorporated in a drive device of a hybrid vehicle or an electric vehicle. Such a rotating electric machine is disadvantageous in terms of temperature rise because it is necessary to pass a large current during use or it is used in the immediate vicinity of the engine. That is, if the temperature of the stator coil is considerably higher than the temperature of each part of the rotating electrical machine, and if the temperature of the stator coil exceeds a predetermined level, the components constituting the rotating electrical machine may be thermally deteriorated.

  Therefore, it is necessary to sufficiently cool the coil of the stator, and there is a liquid cooling method as the cooling means. For example, as the liquid refrigerant, the oil for lubricating the drive device is used to supply the oil. The coil is cooled over the coil.

  However, even if oil is applied to the stator coil to cool the stator coil, the temperature of the stator coil is measured by a temperature sensor in case the temperature of the stator coil rises above a predetermined level. It is important to ensure safety by appropriately monitoring, for example, by operating the safety circuit when the temperature rises, and by operating the safety circuit.

  For example, in the technology disclosed in Patent Document 1, a thermistor that is a temperature sensor is inserted in a gap between a coil end portion of a stator that is a temperature measuring portion and a coil end portion that is adjacent to the coil end portion.

  In the technique disclosed in Patent Document 2, a metal heat transfer section serving as a temperature measurement section is provided at a neutral point terminal that is a part of the stator winding of the stator core. It is covered with a hot part.

JP 2005-86882 A JP 2008-131775 A

  However, in the techniques disclosed in Patent Document 1 and Patent Document 2, oil that cools the coil is applied to both the coil end portion serving as the temperature measurement portion that measures the coil temperature and the metal heat transfer portion. Therefore, cooling oil is directly or indirectly applied to a temperature sensor (for example, a thermistor) that is located in the temperature measuring unit and detects the temperature of the coil, and the temperature sensor is affected by the oil temperature. Structure.

  That is, in Patent Document 1, the thermistor is affected by the oil temperature. Similarly, in Patent Document 2, even if a thermistor serving as a temperature sensor is covered with a metal heat transfer section, the temperature change of the metal heat transfer section that has been oiled is quickly conducted to the thermistor, and the oil temperature Will be affected.

  In such a conventional structure, for example, even if the temperature of the temperature measuring unit of the actual coil is 200 ° C., the temperature sensor is also oiled. Even low temperatures will be detected. As a result, there has been a problem that the coil temperature cannot be detected correctly.

  On the other hand, in recent years, for the purpose of improving the performance of a rotating electrical machine, a coil is wound more densely, or a coil wire constituting the coil has a rectangular cross section. Specifically, as the coil wire, a flat wire such as an edge width coil is adopted, and a coil wire having higher rigidity than a conventional coil wire having a circular cross section is adopted. Has been.

  Therefore, when the coil is wound more densely or when a coil wire having a square cross-sectional shape is used, there is a problem that a space for arranging the temperature sensor cannot be secured between the coil end portions, and the temperature sensor cannot be arranged.

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 that can detect the temperature of a coil that can be liquid cooled by a liquid refrigerant more accurately.

In order to solve the above-mentioned problem, a rotating electrical machine according to claim 1 is provided in a temperature sensor that measures a temperature of a coil that can be liquid-cooled by a liquid refrigerant and that detects the temperature of the temperature measuring unit. The heat insulation member which suppresses that a refrigerant | coolant directly contacts is arranged , and it makes it the summary that the said heat insulation member formed the air layer in the site | part surrounding the said temperature sensor .

  In order to solve the above problems, a rotating electrical machine according to claim 2 is characterized in that, in claim 1, the heat insulating member is formed of a material having high heat resistance and oil resistance.

  In order to solve the above problems, a rotating electrical machine according to claim 3 is characterized in that, in claim 1 or 2, a temperature sensor is built in the heat insulating member.

  In order to solve the above-mentioned problem, a rotating electrical machine according to a fourth aspect of the present invention is the rotating electrical machine according to any one of the first to third aspects, wherein the coil is configured by a coil wire having a square cross-sectional shape, and the temperature at the coil end portion The gist is that the measurement part is formed.

  In order to solve the above-described problem, a rotating electrical machine according to a fifth aspect of the present invention is the rotating electrical machine according to any one of the first to third aspects, wherein the coil is configured by a coil wire having a square cross-sectional shape and a neutral crossover wire of the coil. The gist is that the temperature measuring unit is formed.

In order to solve the above problem, a rotating electrical machine according to a sixth aspect of the present invention is the rotary electric machine according to any one of the first to fifth aspects, wherein the heat insulating member is provided with a guide portion that guides the temperature sensor to the temperature measuring portion. And

In order to solve the above problem, a rotating electrical machine according to a seventh aspect of the present invention is the rotating electrical machine according to any one of the first to sixth aspects, wherein the heat insulating member is provided with a biasing member that biases the temperature sensor toward the temperature measuring unit. Is the gist.

In order to solve the above-mentioned problem, the rotating electrical machine according to claim 8 is characterized in that, in any one of claims 1 to 7 , the heat insulating member is provided with a retaining portion that prevents the heat measuring member from coming off from the temperature measuring portion. To do.

According to the rotating electrical machine of the first aspect of the present invention, the temperature sensor to which the oil or the like that is the liquid refrigerant is applied can prevent the influence of the oil temperature at the heat insulating member , and the heat insulating property can be improved. Since the influence of the oil temperature can be reduced , the coil temperature can be detected more accurately.

  According to the invention of the rotating electrical machine according to claim 2, it is possible to improve the durability of the heat insulating member.

  According to the invention of the rotating electrical machine according to claim 3, if the heat insulating member is arranged in the temperature measuring unit, the temperature sensor can be attached to the temperature measuring unit at the same time.

  According to the invention of the rotating electrical machine according to claim 4, the temperature sensor can be arranged even in a configuration in which the coil is formed of a coil wire having a square cross-sectional shape.

  According to the invention of the rotating electrical machine according to claim 5, similarly to the invention according to claim 4, the temperature sensor can be arranged even in a configuration in which the coil is formed of a coil wire having a square cross-sectional shape.

According to the invention of the rotating electrical machine according to claim 6 , if the heat insulating member is disposed in the temperature measurement unit at the guide portion, the attachment of the temperature sensor to the temperature measurement unit can be further facilitated.

According to the rotary electric machine of the seventh aspect , the temperature sensor has excellent thermal contact or thermal adhesion to the temperature measuring unit, and can detect the coil temperature more accurately.

According to the rotary electric machine of the eighth aspect , the temperature sensor is prevented from coming off from the temperature measuring unit, and can continue to detect the coil temperature more accurately.

It is sectional drawing which shows the structure of the rotary electric machine which concerns on embodiment of this invention. It is the top view which expanded and showed the part of the coil of the stator which concerns on embodiment of this invention. In an example of the temperature measurement part in embodiment of this invention, it is also a schematic diagram which shows the state before arranging a heat insulation member in a temperature measurement part. In the other example of the temperature measurement part in embodiment of this invention, it is a schematic diagram which shows the state before arranging a heat insulation member in a temperature measurement part. It is a schematic diagram which shows the 1st example of the heat insulation member in embodiment of this invention. It is sectional drawing which shows an example of the biasing member in embodiment of this invention. It is a fragmentary sectional view showing other examples of a biasing member in an embodiment of the invention. It is a schematic diagram which shows the 2nd example of the heat insulation member in embodiment of this invention. It is A view of the heat insulation member shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross section perpendicular to the rotation axis of the rotating electrical machine 10, and the rotating electrical machine 10 includes a shaft 11 that is a rotating shaft, a rotor 12 that is coupled to the shaft 11, and a stator 13 that is fixed to a case (not shown). including.

  The stator 13 is formed by laminating electromagnetic steel plates, for example. The stator 13 is provided with 12 tooth portions 14. A coil 15 concentratedly wound by a coil wire having a square cross section is disposed on the teeth portion 14 of the stator 13. A rotor 12 is rotatably accommodated in a cavity inside the stator 13.

  The rotor 12 is formed, for example, by laminating electromagnetic steel plates, and permanent magnets 16 are arranged in eight cavities provided in the electromagnetic steel plates. When the three-phase alternating current is applied to the coil 15, the rotor 12 rotates about the center of the shaft 11 by the force generated between the coil 15 and the permanent magnet 16.

  The rotating electrical machine 10 suppresses an increase in the temperature of the coil 15 by applying oil as a liquid refrigerant to the coil 15 by a cooling device (not shown). In addition, although the case where the rotating electrical machine 10 is a motor has been described, it may be a generator that generates electricity in the coil of the stator by rotating the rotor by an external force.

  The coil 15 has twelve coil units 15A, 15B, 15C, 15D, 15E, 15F, 15G, 15H, 15I, 15J, 15K, and 15L that are attached to twelve teeth of the stator 13.

  FIG. 2 is a plan view showing a more detailed configuration of the coil 15 in FIG. 1, and in particular, an enlarged connection portion between the coil winding end ends of the coil unit 15F and the coil unit 15G and the neutral crossover wire 17. Show. The conductive wire winding end 15F2 drawn from the coil end 15F1 of the coil unit 15F and the conductive wire winding end 15G2 drawn from the coil end 15G1 of the coil unit 15G are welded to the neutral crossover wire 17. It is generally well known that they are electrically connected with each other.

  Next, the configuration of the temperature measuring unit 18 that measures the temperature of the coil 15 will be described. The coil temperature measuring unit 18 is a part where the temperature of the coil 15 is measured, and it is sufficient that the coil 15 has a thermal contact relationship with the coil 15.

  Therefore, the temperature measurement part 18 of the coil 15 can be an extension part provided in the coil end part or an extension part provided in the neutral point crossover of the coil. The extended portion provided in the coil end portion extends from a conductor member drawn out from the coil end portion of the coil unit, or a conductive wire end portion of each coil unit, for example, a conductive wire winding start portion or a conductive wire winding end portion. Extension part etc. are included.

  On the other hand, the extension part provided in the neutral crossover line is formed by attaching a conductor member different from the extension part formed by drawing a part of the neutral crossover line or the neutral crossover line Extension part etc. are included. In addition, the temperature measurement part 18 can increase not only in one place but if necessary, and the number should not be limited.

  As an example of the temperature measurement unit 18, a schematic diagram of a configuration in which an extension part 15G3 that extends the winding end 15G2 drawn from the coil end part 15G1 of the coil unit 15G of the coil 15 is formed as the temperature measurement part 18 is illustrated. As shown in FIG. The extending portion 15G3 can be formed by connecting a conductor, which is a member different from the conductor winding end portion 15G2, to the conductor winding end portion 15G2.

  Further, as another example of the temperature measuring unit 18, FIG. 4 is a schematic diagram showing a configuration in which an extending portion 17A provided on the neutral crossover line 17 is formed as the temperature measuring unit 18. The extended portion 17A can also be formed by the neutral crossover line 17 itself, or can be formed by connecting a conductor different from the neutral crossover line 17 to the neutral crossover line 17.

  Next, the heat insulation structure of the temperature sensor 19 that detects the temperature of the temperature measuring unit 18 that is the temperature of the coil 16 will be described with reference to FIG. The temperature sensor 19 includes a thermistor 20 that detects the temperature of the temperature measurement unit 18, and the thermistor 20 is provided with a heat insulating member 21 so as not to be affected by the oil temperature of the oil that cools the coil 15.

  The heat insulating member 21 covers the thermistor 20 to insulate the liquid refrigerant oil from direct contact with the temperature sensor 19, and is preferably covered with a material excellent in heat resistance and oil resistance. A resin such as PPS (polyphenylene sulfide), 66 nylon or 6 nylon, PEEK (polyether ether ketone) can be used.

  The temperature sensor 19 can be configured as an assembly by incorporating the thermistor 20 in the heat insulating member 21. The thermistor 20 and the heat insulating member 21 can be integrally formed by insert molding. In order for the thermistor 20 to detect the temperature of the temperature measuring unit 18, a guide groove 22 serving as a guide unit for guiding the thermistor 20 to the temperature measuring unit 18 is provided on the heat insulating member 21 so that the thermistor 20 can be positioned on the temperature measuring unit 18. The thermistor 20 is provided from the bottom to the inside toward the arrangement position of the thermistor 20.

  That is, in order to attach the thermistor 20 to the temperature measurement unit 18, the tip of the temperature measurement unit 18 is inserted into the guide groove 22 of the heat insulating member 21, and the temperature measurement unit 18 is inserted into the guide groove 22. Then, the temperature measurement unit 18 and the thermistor 20 disposed in the heat insulating member 21 are guided to a predetermined position for measuring the temperature of the coil 15, and the thermistor 20 is not affected by the oil temperature. It can be mounted at a position where the temperature of the coil 15 can be detected.

  In addition, as a shape of the temperature measurement part 18, the shape suitable for guide means, such as the guide groove 22 distribute | arranged to the heat insulation member 21, is more preferable in mountability.

  Further, as shown in FIGS. 5 and 6, in order to improve the temperature detection accuracy of the coil 15, in order to improve the thermal contact between the thermistor 20 and the temperature measuring unit 18, the thermistor 20 is directed toward the temperature measuring unit 18. A spring mechanism 23 is provided inside the heat insulating member 21 as an urging member for urging to the heat insulating member 21.

  In addition to the spring mechanism 23, if the resin itself forming the heat insulating member 21 has an elastic force enough to urge the thermistor 20 in the direction of the temperature measuring unit 18, as shown in FIG. It can be used as a biasing member.

  Further, as shown in FIG. 5, the heat insulating member 21 is formed at a position away from the guide groove 22 by a predetermined distance in order to form an air layer as a heat insulating layer in a portion surrounding the thermistor 20. A groove portion 24 that forms an air layer is provided in parallel with the longitudinal direction of the guide groove 22 between the outer surface of the guide groove 22 and the thermistor 20. The presence of the groove 24, which is an air layer, improves the heat insulation to the thermistor 20 and can be made unaffected by the oil temperature.

  As shown in FIG. 6, the groove portion 24 can be appropriately provided with a rib portion 24 </ b> A to reinforce the deformation of the heat insulating member 21.

  The thermistor 20 is electrically connected to an external circuit (not shown) through a lead wire 20A.

  Further, as shown in FIG. 8, the heat insulating member 21 is formed with a retaining portion 25 that prevents the temperature sensor 19 from being detached from the temperature measuring portion 18. As shown in FIG. 9, the retaining portion 25 has a pair of engaging claws that elastically engage with the bottom surface of, for example, the neutral crossover line 17 on the coil 16 side from both sides in the width direction of the neutral crossover line 17. 25A. Due to the presence of the retaining portion 25, the temperature sensor 19 having the heat insulating member 21 is improved in holding force with respect to the temperature measuring portion 18.

  In FIG. 2 and the like, the winding end portions of the coil 15 such as the conductive wire winding end portions 15F2 and 15G2 are drawn from the inner peripheral side to the outer peripheral side. Obviously, when it is arranged on the inner peripheral side of the stator 13, the winding end may be drawn from the outer peripheral side of the stator 13 toward the inner peripheral side.

  In FIG. 2 and the like, the coil 15 is an example of a concentrated coil, but the present invention can be applied to a coil wound in addition to a concentrated coil, a coil wound repeatedly, and a coil wound in other ways. is there.

  In addition, when there are a plurality of embodiments, it is obvious that the characteristic portions of each embodiment can be appropriately combined unless otherwise specified.

DESCRIPTION OF SYMBOLS 10 ... Rotating electric machine, 13 ... Stator, 15 ... Coil, 15F1, 15G1 ... Coil end part, 15F2, 15G2 ... End of winding end of wire, 15G3 ... Extension of coil end part Current part (temperature measurement part), 17 ... neutral point crossover line, 17A ... extension part of neutral point crossover line (temperature measurement part), 18 ... temperature measurement part, 20 ... temperature Sensor (thermistor), 21 ... heat insulating member, 22 ... guide groove (guide part), 23 ... spring mechanism (biasing member), 24 ... groove part (air layer), 25 ... missing Stop part.

Claims (8)

In a rotating electrical machine having a coil that can be liquid cooled by a liquid refrigerant,
A thermal sensor that suppresses direct contact of the liquid refrigerant is disposed in a temperature sensor that is located in a temperature measurement unit that measures the temperature of the coil and detects the temperature of the temperature measurement unit , A rotating electrical machine with an air layer formed around the temperature sensor .   2. The rotating electrical machine according to claim 1, wherein the heat insulating member is formed of a material having high heat resistance and oil resistance.   The rotary electric machine according to claim 1 or 2, wherein the temperature sensor is incorporated in the heat insulating member.   The rotating electrical machine according to any one of claims 1 to 3, wherein the coil is configured by a coil wire having a square cross-sectional shape, and an extending portion provided in the coil end portion is used as the temperature measuring portion.   The rotating electrical machine according to any one of claims 1 to 3, wherein the coil is configured by a coil wire having a square cross-sectional shape, and an extending portion provided on a neutral wire of the coil is the temperature measuring unit. In any one of claims 1 to 5, a rotating electrical machine the temperature sensor in the heat insulating member is provided a guide portion for guiding to said temperature measuring section. In any one of claims 1 to 6, the rotary electric machine provided with a biasing member for biasing the temperature sensor in the temperature measuring part direction to said insulating member. In any one of claims 1 to 7, the rotary electric machine provided with a retaining portion for preventing detachment from the temperature measuring unit to the heat insulating member.

Images