JP2010022100A - Heating device for three-phase rotary electric machine, and heating method for each phase coil of three-phase rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device for a three-phase rotary electric machine, capable of shortening time for varnish curing steps in manufacturing of the three-phase rotary electric machine. <P>SOLUTION: The heating device 10 for the three-phase rotary electric machine includes a heating means using electromagnetic induction and a heating section 20 heated with the heating means. The heating section 20 is constituted of a magnetic body and is heat-transmissively connected to the ends of each phase coil wound around a stator core 12. The ends of each phase coil connected to the heating section 20 are a neutral point of each phase coil. Furthermore, the heating section 20 is tablet-shaped following the contour of the coil ends and is provided on the surface 140 of the coil ends. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heating device and a heating method, and more particularly to a heating device for a three-phase rotating electrical machine and a heating method for each phase coil of the three-phase rotating electrical machine.

  There is a manufacturing process of a three-phase rotating electrical machine in which each phase coil wound around a stator core of the three-phase rotating electrical machine is fixed, impregnated, cooled, and prevented from deterioration and impregnated with varnish. In the manufacturing process of this three-phase rotating electrical machine, the varnish curing process is required to be completed in as short a time as possible. For example, in Patent Document 1, in a drying method in a varnish curing process of a stator winding of a rotating electrical machine, a magnetic material is formed in a cylindrical shape around the outer periphery of a coil end of a stator winding heated by an induction heating method. The far-infrared radiation material is attached to the inner peripheral side of the cylinder, and the cylindrical magnetic body is heated by induction heating to excite the far-infrared radiation material, and the far-infrared radiation is radiated from the surface to the coil end. It is stated that the end is heated.

JP-A-5-83904

  By using the configuration of Patent Document 1, when the three-phase rotating electrical machine is heated by induction heating, the temperature difference between the stator core portion and the coil end can be reduced and the time for the varnish curing process can be shortened as a whole. However, in the configuration of Patent Document 1, the surface of the coil end facing the inner peripheral surface of the cylinder coated with far-infrared ceramics is easily heated, but the portion of the coil located inside the coil end or in the slot is difficult to be heated. These parts require a long time for the varnish curing process because of a large temperature difference from the stator core part.

  An object of the present invention is to provide a heating device for a three-phase rotating electric machine and a method for heating each phase coil of the three-phase rotating electric machine that can shorten the time of the varnish curing process in the manufacturing process of the three-phase rotating electric machine. It is.

  A heating device for a three-phase rotating electrical machine according to the present invention is a heating device for a three-phase rotating electrical machine including a heating unit and a heating unit heated by the heating unit, and the heating unit is made of a magnetic material. And is connected to the end of each phase coil wound around the stator core so that heat can be transferred.

  In the heating device for a three-phase rotating electrical machine according to the present invention, the end of each phase coil connected to the heating unit is preferably a neutral point of each phase coil.

  In the heating device for a three-phase rotating electrical machine according to the present invention, it is preferable that the heating means is induction heating using electromagnetic induction.

  In the heating device for a three-phase rotating electrical machine according to the present invention, it is preferable that the heating unit has a flat plate shape along the outer shape of the coil end and is provided on the surface of the coil end.

  Moreover, in the heating apparatus for a three-phase rotating electrical machine according to the present invention, the heating unit preferably has a connection part for connecting the ends of the respective phase coils in a bundle.

  The method for heating each phase coil of the three-phase rotating electrical machine according to the present invention includes a step of disposing a heating part made of a magnetic material and having a flat plate shape along the outer shape of the coil end on the surface of the coil end; The method includes a step of connecting neutral points of each phase coil and a step of heating the heating unit.

  According to the heating device for a three-phase rotating electrical machine having the above-described configuration, the heating unit is heated, and the heat can be directly conducted to the coil, and further, the heat can be conducted similarly to each phase coil. . Thereby, the time of a varnish hardening process can be shortened in the manufacturing process for three-phase rotating electrical machines.

  According to the heating device for a three-phase rotating electrical machine in which the end of each phase coil having the above configuration is a neutral point, the end of each phase coil is compared to the terminal on the other end and having a shape restriction. There is flexibility in the shape of the end.

  According to the heating method for each phase coil of the three-phase rotating electrical machine having the above-described configuration, the heating unit is heated, and the heat can be directly conducted to the coil, and the same is conducted to each phase coil in the same manner. be able to. Thereby, the time of a varnish hardening process can be shortened in the manufacturing process for three-phase rotating electrical machines.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. Further, in this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating understanding of the present invention, and can be appropriately changed according to the use, purpose, specification, and the like.

  FIG. 1 is a diagram showing a three-phase rotating electrical machine 5 and a three-phase rotating electrical machine 5 according to the first embodiment of the present invention. FIG. 1A is a plan view of a heating device 10 for a three-phase rotating electric machine (the induction coil 16 is not shown) and the three-phase rotating electric machine 5, and FIG. 1B is a heating for the three-phase rotating electric machine. It is a side view of the apparatus 10 and the three-phase rotary electric machine 5.

  The heating device 10 for a three-phase rotating electrical machine includes a heating unit 20 and an induction coil 16. The heating device 10 for a three-phase rotating electrical machine is heated by heating means using an induction coil 16. The heating unit 20 is a flat plate having an arc shape along the surface 140 of the coil end 14. A detailed description of the heating unit 20 will be described later.

  The induction coil 16 is a coil wound around the stator core 12 a plurality of times along the circumferential direction so as not to contact the stator core 12 around the stator core 12. When a current is passed through the induction coil 16, a magnetic flux is generated, and the magnetic flux passes through the stator core 12 and the heating unit 20 having a high magnetic permeability.

  The three-phase rotating electrical machine 5 includes a rotor (not shown), a stator core 12, and each phase coil (U-phase coil, V-phase coil, and W-phase coil) wound around the stator core 12. The rotor is a rotor that rotates in the circumferential direction when the three-phase rotating electrical machine 5 functions as a motor or a generator.

  The stator core 12 is a stator having a substantially cylindrical shape provided opposite to the outer periphery of the rotor, and current is supplied to each phase coil wound around the stator core 12 when the three-phase rotating electrical machine 5 functions as a motor or a generator. Flows. The stator core 12 is formed by laminating electromagnetic steel plates.

  The coil end 14 is a portion that protrudes from the end surface of the stator core 12 among the coils in which the phase coils are wound around the stator core 12 in each tooth of the stator core 12. The varnish, which is an insulating material, is impregnated throughout the coil from the surface of the coil end 14 through the gap of the coil for the purpose of fixing, insulation, cooling, prevention of deterioration, and the like.

  FIG. 2 is a diagram showing the relationship between the heating unit 20 and each phase coil (U-phase coil 141, V-phase coil 142, W-phase coil 143). 3A is a view of the heating unit 20 in FIG. 2 as viewed from the back side, and FIG. 3B is a view of the heating unit 20 as viewed from the direction of arrow A in FIG. The heating unit 20 is a member made of a magnetic material, and includes a main body unit 21 and a connection unit 22.

  The main body 21 is a flat plate made of a magnetic material and has an arc shape along the surface 140 of the coil end 14. As shown in FIG. 3, a connection portion 22 is attached to the end portion of the back surface of the main body portion 21. The connection part 22 inserts the neutral point part 150 formed by bundling the ends of the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143 and making them electrically connected to each other so as to be able to transfer heat. For example, it has a substantially semi-cylindrical shape having a through-hole. Note that the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143 shown in FIG. 3 are schematic diagrams of each phase coil wound around the stator core 12.

  The U-phase coil 141, the V-phase coil 142, and the W-phase coil 143 are formed of thin enameled copper wires, and U-phase terminals 241 and V-phase, which are connection terminals with the inverter circuit, are respectively provided at one end. Terminal 242 and W-phase terminal 243 are connected. Further, as described above, the neutral portion 150 is formed by bundling the end portions and connecting them to each other so that they can be electrically connected to each other so as to transfer heat.

  Next, the operation of the heating apparatus 10 for a three-phase rotating electrical machine having the above-described configuration will be described with reference to FIGS. FIG. 4 is a flowchart showing the procedure of the varnish curing process in the manufacturing process of the three-phase rotating electrical machine 5. Among the manufacturing steps of the three-phase rotating electrical machine 5, there is a step of winding the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143 around each tooth of the stator core 12. There is a step of pouring the varnish from the surface 140 of the coil end 14 through the gaps between the coils and impregnating the entire coil with the varnish.

  Next, the hardening process of the varnish impregnated in the whole coil as mentioned above is demonstrated using FIG. First, the heating unit 20 is disposed along the surface 140 of the coil end 14 (S2). And the neutral point part 150 of each phase coil is connected to the connection part 22 of the heating part 20 (S4).

  When a current is passed through the induction coil 16, magnetic flux is generated, and these magnetic fluxes pass through the stator core 12 and the heating unit 20 having high permeability along the direction of arrow B. When the magnetic flux passes through the stator core 12 and the heating unit 20, heat is generated in the stator core 12 and the heating unit 20 due to eddy current loss and hysteresis loss (S6).

  The heat generated in the heating unit 20 is conducted to the neutral point 150 through the connection unit 22, and further from the neutral point 150 through the U phase coil 141, the V phase coil 142, and the W phase coil 143 to the U phase. The heat is conducted to terminal 241, V-phase terminal 242, and W-phase terminal 243, respectively.

  Thus, heat is directly conducted to the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143, and the temperature difference from the stator core 12 is reduced as compared with the case where heating is performed from the surface 140 of the coil end 14. Can do. Thereby, the whole time of a varnish hardening process can be shortened. Moreover, since it is heated from the neutral point part 150 which bundled the edge part of U phase coil 141, V phase coil 142, and W phase coil 143, while suppressing the voltage drop by the electrical resistance of heating part 20 itself, The phase coil can be heated in the same way.

  A neutral point 150 is connected to the connecting part 22 of the heating part 20 of the heating device 10 for a three-phase rotating electrical machine. The neutral point 150 has a higher degree of freedom in shape and arrangement than the terminal side such as the U-phase terminal 241, the V-phase terminal 242, and the W-phase terminal 243, which have many restrictions on the terminal shape. Further, the heating unit 20 is made of a magnetic material and is an arc-shaped flat plate along the surface 140 of the coil end 14. Since the area of the flat plate can be secured widely, the amount of linkage of the induced magnetic flux is increased. be able to.

  Next, a heating device 11 for a three-phase rotating electrical machine that is a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing a heating device 11 for a three-phase rotating electrical machine and a three-phase rotating electrical machine that are the second embodiment of the present invention. Here, the heating device 11 for a three-phase rotating electrical machine according to the second embodiment has substantially the same configuration as the heating device 10 for a three-phase rotating electrical machine according to the first embodiment. The description which overlaps by attaching is abbreviate | omitted by assistance, and a different structure and its effect | action are demonstrated. The difference between the heating device 11 for the three-phase rotating electrical machine and the heating device 10 for the three-phase rotating electrical machine of the second embodiment is only in the iron core 18 and the induction coil 161.

  The iron core portion 18 is a member having a substantially U-shape, and is arranged such that the heating portion 20 provided on the surface 140 of the coil end 14 is positioned in the gap 181 between the open ends. The iron core 18 is a ferromagnetic body provided to strengthen the magnetic field generated by the induction coil 161.

  The induction coil 161 is a coil wound around the main body portion 180 of the iron core portion 18 a plurality of times around the iron core portion 18 so as not to contact the iron core portion 18 outside the iron core portion 18.

  Next, the operation of the heating device 11 for a three-phase rotating electrical machine having the above configuration will be described with reference to FIG. When a current is passed through the induction coil 161, magnetic fluxes are generated, and these magnetic fluxes pass through the iron core portion 18 which is a magnetic path, through the heating portion 20 and the stator core 12 having high magnetic permeability along the direction of arrow C. When the magnetic flux passes through the stator core 12 and the heating unit 20, heat is generated in the stator core 12 and the heating unit 20 due to eddy current loss and hysteresis loss, and this heat is conducted to the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143. The same effect as the heating device 10 for the three-phase rotating electrical machine of the first embodiment is obtained.

  Next, a heating device 13 for a three-phase rotating electrical machine that is a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing a heating device 13 for a three-phase rotating electrical machine and a three-phase rotating electrical machine according to a third embodiment of the present invention. Here, the heating device 13 for a three-phase rotating electrical machine according to the third embodiment has substantially the same configuration as the heating device 10 for a three-phase rotating electrical machine according to the first embodiment. The description which overlaps by attaching is abbreviate | omitted by assistance, and a different structure and its effect | action are demonstrated. The difference between the heating device 13 for the three-phase rotating electrical machine and the heating device 10 for the three-phase rotating electrical machine of the third embodiment is only in the heating part 200, the iron core part 17, and the induction coil 162.

  The heating unit 200 is a member made of a magnetic material like the heating unit 20, and includes a main body unit and a connection unit. The difference between the heating unit 200 and the heating unit 20 is the size. The main body of the heating unit 200 is a flat plate made of a magnetic material, has an arc shape along the surface 140 of the coil end 14, and is large enough to protrude from the surface 140 of the coil end 14 as shown in FIG. Have In addition, about the part which protruded from the surface 140 of the coil end 14 among the shapes of the heating part 200, it may not be circular arc shape, and should just be a shape which the amount of magnetic flux linkage from the iron core part 17 increases. .

  The iron core portion 17 is a member having a substantially U-shape, and is arranged such that the end portion of the heating portion 200 provided on the surface 140 of the coil end 14 is positioned in the gap 171 between the open end portions thereof. The The iron core portion 17 is a ferromagnetic body provided to strengthen the magnetic field generated by the induction coil 161.

  The induction coil 162 is a coil wound around the main body portion 170 of the iron core portion 17 a plurality of times around the iron core portion 17 so as not to contact the iron core portion 17 outside the iron core portion 17.

  Next, the operation of the heating device 13 for a three-phase rotating electrical machine having the above-described configuration will be described with reference to FIG. When an electric current is passed through the induction coil 162, magnetic fluxes are generated, and these magnetic fluxes pass through the heating part 200 having a high magnetic permeability along the direction of arrow D through the iron core part 17 which is a magnetic path. When the magnetic flux passes through the heating unit 200, heat is generated in the heating unit 200 due to eddy current loss and hysteresis loss, and this heat is conducted to the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143, and the first embodiment. The same effects as those of the heating device 10 for the three-phase rotating electrical machine are obtained.

It is a top view of the heating device (the induction coil is not illustrated) for the three-phase rotating electrical machine and the three-phase rotating electrical machine according to the first embodiment of the present invention. It is a side view of a heating device for a three-phase rotating electrical machine and a three-phase rotating electrical machine according to a first embodiment of the present invention. It is the figure which showed the relationship between a heating part and each phase coil (U phase coil, V phase coil, W phase coil). It is the figure which looked at the heating part in FIG. 2 from the back surface. It is a figure which shows the heating part seen from the arrow A direction in Fig.3 (a). It is a flowchart which shows the procedure of the varnish hardening process in the manufacturing process of a three-phase rotary electric machine. It is a figure which shows the heating apparatus and three-phase rotary electric machine for three-phase rotary electric machines which are 2nd Embodiment of this invention. It is a figure which shows the heating apparatus and three-phase rotary electric machine for three-phase rotary electric machines which are 3rd Embodiment of this invention.

Explanation of symbols

  5 Three-phase rotating electrical machine 10, 11, 13 Heating device for three-phase rotating electrical machine, 12 Stator core, 14 Coil end, 16 Inductive coil, 17, 18 Iron core part, 20, 200 Heating part, 21, 170, 180 Main part 22 connection part, 140 surface, 141 U-phase coil, 142 V-phase coil, 143 W-phase coil, 150 neutral point part, 161,162 induction coil, 171,181 gap, 241 U-phase terminal, 242 V-phase terminal, 243 W-phase terminal.

Claims (6)

Heating means;
A heating unit heated by a heating means;
A heating device for a three-phase rotating electrical machine comprising:
The heating part
A heating device for a three-phase rotating electrical machine, which is made of a magnetic material and is connected to an end of each phase coil wound around a stator core so that heat can be transferred. In the heating apparatus for three-phase rotating electrical machines according to claim 1,
The heating device for a three-phase rotating electrical machine, wherein an end of each phase coil connected to the heating unit is a neutral point of each phase coil. In the heating apparatus for three-phase rotating electrical machines according to claim 1 or 2,
A heating device for a three-phase rotating electrical machine, wherein the heating means is induction heating using electromagnetic induction. In the heating apparatus for three-phase rotating electrical machines according to any one of claims 1 to 3,
The heating part
A heating device for a three-phase rotating electrical machine having a flat plate shape along an outer shape of a coil end and provided on a surface of the coil end. In the heating apparatus for three-phase rotating electrical machines according to any one of claims 1 to 4,
The heating part
A heating device for a three-phase rotating electrical machine, comprising a connection part for bundling and connecting ends of each phase coil. A step of disposing a heating unit made of a magnetic material and having a flat plate shape along the outer shape of the coil end on the surface of the coil end;
Connecting the neutral point of each phase coil to the heating section;
Heating the heating unit;
A method for heating each phase coil of a three-phase rotating electrical machine.

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