JP2020031006A - Rotor core heating device - Google Patents

Abstract

To provide a rotor core heating device which efficiently performs an induction heating of a rotor core in each outer diameter, when using the same device for the rotor core having the different outer diameter.SOLUTION: In a rotor core heating device 20 performing an induction heating of a rotor core 10A of a dynamo-electric motor with an inner diameter side coil 26 on an inner diameter side and an outer diameter side of the rotor core and outer diameter side coils 22 and 24, each outer diameter side coil includes a first outer diameter side coil 22, and a second outer diameter side coil 24 which is arranged at a position deviated in an axial direction in view of a radial direction and has a diameter smaller than that of the first outer diameter side coil. The inner diameter side coil can be moved in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor core heating device.

  Conventionally, as a rotor core heating device of this type, a rotor core heating device that performs induction heating (high-frequency heating) of a rotor core by an inner diameter side coil and an outer diameter side coil arranged on the inner diameter side and the outer diameter side of a hollow cylindrical rotor core, There has been proposed a rotor core having a pair of magnetic flux shielding jigs having substantially the same diameter as the rotor core and arranged in close contact with both end surfaces in the axial direction of the rotor core (for example, see Patent Document 1). In this rotor core heating device, by providing a pair of magnetic flux shielding jigs, the rotor core can be heated without invading magnetic flux between the rotor core and the magnetic flux shielding jig.

JP 2017-50169 A

  In the above-described rotor core heating device, when the same device is used for rotor cores having different outer diameters, for a rotor core having a smaller outer diameter, the distance between the rotor core and the outer diameter side coil becomes longer, the magnetic field acting on the rotor core becomes weaker, and induction occurs. The efficiency of heating decreases.

  A main object of the rotor core heating device of the present invention is to efficiently perform induction heating of rotor cores of each outer diameter when the same device is used for rotor cores having different outer diameters.

  The rotor core heating device of the present invention employs the following means to achieve the above-mentioned main object.

The first rotor core heating device of the present invention includes:
A rotor core heating device for induction heating a rotor core of an electric motor by an inner diameter side coil and an outer diameter side coil of an inner diameter side and an outer diameter side of the rotor core,
The outer diameter side coil includes a first outer diameter side coil and a second outer diameter side coil which is disposed at a position shifted in the axial direction when viewed from the radial direction and has a smaller diameter than the first outer diameter side coil. Have
The inner diameter side coil is movable in an axial direction,
That is the gist.

  In the first rotor core heating device of the present invention, the outer diameter side coil is disposed at a position shifted from the first outer diameter side coil in the axial direction as viewed from the radial direction, and the outer diameter side coil is located at a position higher than the first outer diameter side coil. A second outer diameter coil having a smaller diameter, and the inner diameter coil is movable in the axial direction. Thus, the rotor core having a large outer diameter is induction-heated by the first outer diameter coil and the inner diameter coil, and the rotor core having a small outer diameter is induction-heated by the second outer diameter coil and the inner diameter coil. it can. As a result, when the same device is used for rotor cores having different outer diameters, induction heating of the rotor cores having different outer diameters can be efficiently performed.

  In the first rotor core heating device of the present invention, the first outer diameter side coil and the second outer diameter side coil may be selectively energizable. In this case, regardless of which of the rotor core having a large outer diameter and the rotor core having a small outer diameter is induction-heated, compared to a rotor core energized to the first outer diameter coil and the second outer diameter coil, Power loss can be reduced.

  In the first rotor core heating device of the present invention, a first shielding portion having a first contact portion abutting on one end surface of the rotor core, and a second shielding portion having a second contact portion abutting on the other end surface of the rotor core. It may be further provided with a shielding part.

  In this case, the outer diameter of the first shield part and the second shield part may be smaller than the outer diameter of the second outer diameter side coil. In this case, the same first shield portion and second shield portion can be used for rotor cores having different outer diameters.

  In this case, the first rotor core or the second rotor core may be arranged such that the first shielding portion overlaps an end of the first outer diameter side coil or the second outer diameter side coil in an axial direction as viewed from a radial direction. May be arranged. With this configuration, it is possible to suppress the temperature rise of the first shielding portion as compared with the case where the entire first shielding portion is radially opposed to the center portion of the first outer diameter side coil or the second outer diameter side coil. it can.

The second rotor core heating device of the present invention includes:
A rotor core heating device for induction heating a rotor core of an electric motor by an inner diameter side coil and an outer diameter side coil of an inner diameter side and an outer diameter side of the rotor core,
The outer diameter side coil includes a first outer diameter side coil and a second outer diameter side coil which is disposed at a position shifted in the axial direction when viewed from the radial direction and has a smaller diameter than the first outer diameter side coil. Have
The inner diameter side coil extends so as to radially oppose the first outer diameter side coil and the second outer diameter side coil,
That is the gist.

  In the second rotor core heating device of the present invention, the outer diameter side coil is disposed at a position shifted from the first outer diameter side coil in the axial direction when viewed from the radial direction, and the outer diameter side coil is located at a position shifted from the first outer diameter side coil. A second outer diameter coil having a smaller diameter, and the inner diameter coil extends so as to be radially opposed to the first outer diameter coil and the second outer diameter coil. Thus, the rotor core having a relatively large outer diameter is induction-heated by the first outer diameter coil and the inner diameter coil, and the rotor core having a relatively small outer diameter is induced by the second outer diameter coil and the inner diameter coil. Can be heated. As a result, when the same device is used for rotor cores having different outer diameters, induction heating of the rotor cores having different outer diameters can be performed simultaneously and efficiently.

  In the second rotor core heating device, a first shielding portion having a first contact portion that contacts one end surface of the first rotor core, a second contact portion that contacts the other end surface of the first rotor core, and the first rotor core. A second shielding portion having a third contact portion in contact with one end surface of the second rotor core having a small outer diameter, and a third shielding portion having a fourth contact portion in contact with the other end surface of the second rotor core. It may be provided.

  In this case, the first rotor core and the second rotor core may be arranged such that the second shielding portion overlaps an end of the first outer diameter side coil and / or the end of the second outer diameter side coil in an axial direction when viewed from a radial direction. May be arranged. With this configuration, it is possible to suppress the temperature rise of the second shielding portion as compared with the case where the entire second shielding portion radially opposes the center portion of the first outer diameter coil or the second outer diameter coil. it can.

  In the first or second rotor core heating device of the present invention, the inner diameter side coil and the outer diameter side coil may be energized by different power sources. By doing so, the degree of freedom can be given to the design of each power supply, and the efficiency of induction heating of the rotor core can be further improved.

FIG. 1 is a configuration diagram schematically illustrating a configuration of a rotor core heating device 20 according to a first embodiment of the present invention. FIG. 1 is a configuration diagram schematically illustrating a configuration of a rotor core heating device 20 according to a first embodiment of the present invention. It is a block diagram showing the outline of the configuration of the rotor core heating device 120 as the second embodiment of the present invention.

  Next, an embodiment for carrying out the present invention will be described using an embodiment.

  FIGS. 1 and 2 are configuration diagrams schematically showing the configuration of a rotor core heating device 20 as a first embodiment of the present invention. FIG. 1 shows the rotor core heating device 20 when heating the rotor core 10A having a large outer diameter, and FIG. 2 shows the rotor core heating device 20 when heating the rotor core 10B having a small outer diameter. In the first embodiment, the rotor core heating device 20 is installed as shown in FIGS. That is, in the following description, “up” and “down” mean “up” and “down” in FIGS.

  The rotor cores 10A and 10B are substantially the same except that the outer diameters are different, and are each formed in a hollow cylindrical shape by laminating a plurality of electromagnetic steel sheets. Each of the rotor cores 10A and 10B has a plurality of permanent magnets embedded (inserted) into a plurality of magnet holes (not shown) formed at intervals in the circumferential direction and is fixed to a shaft (not shown), so that the rotor cores 10A and 10B are fixed to a shaft (not shown). Configure the rotor.

  The rotor core heating apparatus 20 of the first embodiment is configured as an apparatus for inductively heating the rotor core 10A or the rotor core 10B to fix the rotor core 10A or the rotor core 10B to the shaft by warm fitting, as shown in FIGS. 1 and 2. , Outer diameter coils 22, 24, inner diameter coil 26, shielding parts 30, 32, power supplies 40, 44, and switches 42, 46.

  The outer diameter side coil 22 is formed in a spiral shape by a conductive wire, and has a diameter slightly larger than the outer diameter of the rotor core 10A and an axial length similar to or longer than that of the rotor core 10A. The outer diameter side coil 22 is arranged so that the axis thereof extends in the up-down direction.

  The outer-diameter coil 24 is formed in a spiral shape (electrically independent of the outer-diameter coil 22) by a conductor different from the outer-diameter coil 22 and is slightly larger than the outer diameter of the rotor core 10B. It has a smaller diameter than the radial side coil 22 and an axial length comparable to or longer than that of the rotor core 10B. The outer-diameter coil 24 is located at a position shifted from the outer-diameter coil 22 in the axial direction when viewed from the radial direction (specifically, a position below the outer-diameter coil 22 and (Coaxially), and the axis is arranged to extend in the vertical direction.

  The inner diameter side coil 26 is formed in a spiral shape by a conductive wire, has a diameter slightly smaller than the inner diameter of the rotor cores 10A and 10B, and is equal to or larger than the longer side (the rotor core 10A in the first embodiment) of the rotor cores 10A and 10B. Also have a long axial length. The inner diameter side coil 26 is mounted or fixed on the shielding portion 30 so that the inner diameter side coil 26 is coaxial with the outer diameter side coils 22 and 24 and has an axial center extending vertically.

  The shielding portion 30 is formed in an annular shape (a disk shape or a column shape) having a smaller inner diameter than the rotor cores 10A and 10B and the inner diameter side coil 26 and a slightly smaller outer diameter than the outer diameter side coil 24, for example, using copper or the like. A plurality of (for example, three or four) protrusions 30a are provided on the upper end surface at intervals in the circumferential direction, and a flow passage 30b through which cooling water from a cooling device (not shown) can flow is provided inside. The shielding portion 30 is arranged so as to be coaxial with the outer-diameter coils 22 and 24 and the inner-diameter coil 26, and moves in the axial direction (vertical direction) integrally with the inner-diameter coil 26 by a moving device (not shown). The rotor core 10A or the rotor core 10B is placed on the shield 30 so that the rotor core 10A or the rotor core 10B is coaxial with the shield 30 and the lower end surface of the rotor core 10A or the rotor core 10B is in contact with the plurality of protrusions 30a of the shield 30.

  The shielding portion 32 is formed in an annular shape (a disk shape or a column shape) having, for example, copper or the like having an inner diameter approximately equal to that of the rotor cores 10A and 10B and having an outer diameter slightly smaller than the outer diameter side coil 24. A plurality (for example, three or four) of projections 32a are provided at intervals in the circumferential direction. The rotor core 10A or the rotor core 10B is mounted on the rotor core 10A or the rotor core 10B so as to be coaxial with the rotor core 10A or the rotor core 10B and such that the plurality of projections 32a of the shielding portion 32 abut on the upper end surface of the rotor core 10A or the rotor core 10B. You.

  The power supplies 40 and 44 are configured as AC power supplies. The switch 42 is in a state in which the power supply 40 is connected to the outer diameter coil 22, a state in which the power supply 40 is connected to the outer diameter coil 24, and a state in which the power supply 40 is disconnected from the outer diameter coils 22, 24 Is switchable. The switch 46 is configured to be able to switch between connection and disconnection between the power supply 44 and the inner diameter side coil 26.

  In the rotor core heating device 20 of the first embodiment configured as described above, the induction heating of the rotor core 10A is performed, for example, as follows. First, the rotor core 10A and the shield 32 are placed in this order on the shield 30 arranged at a relatively high initial position (for example, a position higher than the outer diameter side coil 22) so as to be coaxial. Subsequently, the shielding portion 30, the inner diameter side coil 26, the rotor core 10A, and the shielding portion 32 are integrally placed on the lower side so that the shielding portion 32 overlaps the upper end portion of the outer diameter side coil 22 in the axial direction when viewed from the radial direction. Move. At this time, the rotor core 10A is located between the outer diameter side coil 22 and the inner diameter side coil 26 in the radial direction (see FIG. 1). Then, the switch 42 is controlled so that the power supply 40 and the outer diameter side coil 22 are connected, and the switch 46 is turned on (by connecting the power supply 44 and the inner diameter side coil 26), and the outer diameter side coil 22 and the inner diameter coil 22 are connected. An alternating current is applied to the side coil 26, and the rotor core 10A is induction heated by a magnetic field generated by the alternating current. At this time, the shielding unit 30 is cooled by the cooling water.

  The induction heating of the rotor core 10B is performed, for example, as follows. First, the rotor core 10B and the shield 32 are placed in this order on the shield 30 arranged at a relatively high initial position (for example, a position higher than the outer diameter side coil 22) so as to be coaxial. Subsequently, the shielding portion 30, the inner diameter side coil 26, the rotor core 10B, and the shielding portion 32 are integrally placed on the lower side so that the shielding portion 32 overlaps the upper end portion of the outer diameter side coil 24 in the axial direction when viewed from the radial direction. Move. At this time, the rotor core 10B is located between the outer diameter side coil 24 and the inner diameter side coil 26 in the radial direction (see FIG. 2). Then, the switch 42 is controlled so that the power supply 40 and the outer diameter side coil 24 are connected, and the switch 46 is turned on (in a state where the power supply 44 and the inner diameter side coil 26 are connected), and the outer diameter side coil 24 and An alternating current is passed through the inner diameter side coil 26, and the rotor core 10B is induction-heated by a magnetic field generated by the alternating current. At this time, the shielding unit 30 is cooled by the cooling water.

  Since the rotor core 10A or the rotor core 10B is induction-heated in this manner, the rotor core 10A or 10B without the outer diameter side coil 24, that is, the rotor cores 10A and 10B are induction heated by the inner diameter side coil 26 and the outer diameter side coil 22. In comparison, even when any one of the rotor cores 10A and 10B is induction-heated, the distance between the rotor cores 10A and 10B and the outer-diameter coils 22 and 24 can be shortened, and the induction heating of the rotor core 10A or the rotor core 10B can be efficiently performed. Can do it. That is, when the same device is used for the rotor cores 10A and 10B having different outer diameters, the induction heating of the rotor cores 10A and 10B can be efficiently performed.

  Further, when the rotor core 10A is induction-heated, only the outer diameter side coil 22 of the outer diameter side coils 22 and 24 is energized, and when the rotor core 10B is induction-heated, the outer diameter side coil 22, 24 is heated. Since only the outer-diameter coil 24 is energized, the power loss is reduced as compared with a configuration in which the outer-diameter coils 22 and 24 are formed by one conductor and both of the outer-diameter coils 22 and 24 are energized. be able to.

  Further, by making the outer diameter of the shield portions 30 and 32 smaller than the outer diameter side coil 24, the same shield portions 30 and 32 can be used for induction heating of the rotor core 10A and induction heating of the rotor core 10B. Can be.

  In addition, when the rotor core 10A or the rotor core 10B is induction-heated, the shielding portion 32 overlaps the upper end portion of the outer diameter side coil 22 or the outer diameter side coil 24 in the axial direction when viewed from the radial direction. The temperature rise of the shielding portion 32 can be suppressed as compared with the radially opposed coil 22 or the central portion of the radially outer coil 24. For this reason, a cooling device for cooling the shielding portion 32 (for example, a device similar to a cooling device for cooling the shielding portion 30) can be omitted.

  Further, since the outer diameter side coils 22, 24 and the inner diameter side coil 26 are energized by different power sources 40, 44, the degree of freedom in designing the power sources 40, 44 is higher than that of the energized by the same power source. , And the efficiency of induction heating of the rotor cores 10A and 10B can be further improved.

  In the rotor core heating device 20 of the first embodiment described above, the outer diameter side coil 22 having a diameter larger than the outer diameter of the rotor core 10A, and the position where the outer diameter side coil 22 is displaced in the axial direction when viewed from the radial direction. And an outer-diameter coil 24 having a diameter larger than the outer diameter of the rotor core 10B and smaller than the outer-diameter coil 22, and having a diameter smaller than the inner diameter of the rotor cores 10A and 10B and movable in the axial direction. And the inner diameter side coil 26. Thereby, when the same device is used for rotor cores 10A and 10B having different outer diameters, induction heating of rotor cores 10A and 10B can be performed efficiently.

  In the rotor core heating device 20 of the first embodiment, the outer diameter side coils 22 and 24 are each formed by two conductors, but may be formed by one conductor. In this case, when the rotor core 10A or the rotor core 10B is induction-heated, power is supplied to both the outer-diameter coils 22 and 24.

  In the rotor core heating device 20 of the first embodiment, when the rotor core 10A or the rotor core 10B is induction-heated, the shielding portion 32 is formed in the axial direction as viewed from the radial direction with the upper end of the outer diameter coil 22 or the outer diameter coil 24. Although the overlapping portion is used, the shielding portion 32 may be radially opposed to the central portion of the outer diameter side coil 22 or the outer diameter side coil 24. In this case, it is preferable to provide a cooling device for cooling the shielding portion 32.

  In the rotor core heating device 20 of the first embodiment, the outer diameter coils 22, 24 and the inner diameter coil 26 are energized by different power sources 40, 44, but may be energized by the same power source. .

  In the rotor core heating device 20 of the first embodiment, the shielding portions 30 and 32 have the plurality of protrusions 30a and 32a, respectively, but may not have the plurality of protrusions 30a and 32a, respectively. In this case, the entire upper end surface of the shield portion 30 contacts the entire lower end surface of the rotor core 10A or the rotor core 10B, and the entire lower end surface of the shield portion 32 contacts the entire upper end surface of the rotor core 10A or the rotor core 10B.

  In the rotor core heating device 20 of the first embodiment, the inner diameter side coil 26 and the shielding portion 32 move vertically in an integrated manner, but may move independently in the vertical direction.

  FIG. 3 is a configuration diagram schematically showing the configuration of the rotor core heating device 120 according to the second embodiment of the present invention. In the second embodiment, the rotor core heating device 120 is installed as shown in FIG. That is, in the following description, “up” and “down” mean “up” and “down” in FIG. In the second embodiment, the same rotor cores 10A and 10B as in the first embodiment are used.

  As shown, the rotor core heating device 120 of the second embodiment includes outer diameter coils 122 and 124, inner diameter coils 126, shielding portions 130, 132 and 134, power supplies 140 and 144, and switches 142 and 146. And

  The outer-diameter coils 122 and 124 are substantially the same as the outer-diameter coils 22 and 24 except that the outer-diameter coils 122 and 124 are spirally formed by one conductive wire (the outer-diameter coils 122 and 124 are electrically connected in series). Are identical. The axial distance between the outer diameter side coil 122 and the outer diameter side coil 124 is designed to be approximately the same as the thickness of the shielding portion 134 or slightly smaller.

  The inner diameter side coil 126 is formed in a spiral shape by a conductive wire, and has a diameter slightly smaller than the inner diameter of the rotor cores 10A and 10B and an axial length longer than the sum of the axial lengths of the rotor cores 10A and 10B. The inner diameter side coil 126 is mounted or fixed on the shielding portion 130 so that the inner diameter side coil 126 is coaxial with the outer diameter side coils 122 and 124 and the axis thereof extends in the vertical direction. At this time, the inner diameter side coil 126 extends so as to face the entire outer diameter side coil 122 and a part (substantially the upper half) of the outer diameter side coil 124 in the radial direction.

  The shielding parts 130 and 132 are formed in substantially the same shape as the shielding parts 30 and 32, respectively. The shielding part 130 has a plurality of projections 130a and a flow path 130b, and the shielding part 132 has a plurality of projections 132a. .

  The shielding portion 134 is formed in an annular shape (a disk shape or a column shape) having an inner diameter approximately equal to that of the rotor cores 10A and 10B and a slightly smaller outer diameter than the outer diameter side coil 124, for example, using copper or the like. A plurality of (for example, three or four) projections 134a are provided at intervals in the circumferential direction, and a plurality of (for example, three or four) projections 134b are provided at the upper end surface at circumferential intervals.

  The power supplies 140 and 144 are configured as AC power supplies. The switch 142 is configured to be able to switch between connection and disconnection between the power supply 140 and the outer-diameter coils 122 and 124. The switch 146 is configured to be able to switch connection and disconnection between the power source 144 and the inner diameter side coil 126.

  In the rotor core heating apparatus 120 of the second embodiment thus configured, simultaneous induction heating of the rotor cores 10A and 10B is performed, for example, as follows. First, the rotor core 10B, the shield 134, the rotor core 10A, and the shield 132 are coaxially arranged in this order on the shield 130 arranged at a relatively high initial position (for example, a position higher than the outer diameter side coil 122). Is placed. Subsequently, the shielding portion 130, the inner diameter side coil 126, the rotor core 10B, the shielding portion 134, the rotor core 10A, and the shielding portion 132 are integrated, and the shielding portion 134 is located between the outer diameter side coils 122 and 124 in the axial direction. It is moved downward so as to face the lower end of the outer diameter coil 122 and the upper end of the outer diameter coil 124 in the radial direction. At this time, the rotor core 10A is located between the outer diameter coil 122 and the inner diameter coil 126 in the radial direction, and the rotor core 10B is located between the outer diameter coil 124 and the inner diameter coil 126 in the radial direction (FIG. 3). Then, the switch 142 is turned on (the power supply 140 is connected to the outer diameter coils 122 and 124), and the switch 146 is turned on (the power supply 144 is connected to the inner diameter coil 126). , 124 and the inner diameter side coil 126, and a magnetic field generated by the alternating current simultaneously heats the rotor cores 10 </ b> A, 10 </ b> B. At this time, the shielding unit 130 is cooled by the cooling water.

  In this way, the rotor cores 10A and 10B are simultaneously induction-heated, so that the rotor cores 10A and 10B without the outer diameter coil 124, that is, the rotor cores 10A and 10B are both induction heated by the inner diameter coil 126 and the outer diameter coil 122. In comparison, the distance between the rotor core 10B and the outer diameter side coil 124 can be shortened, and the induction heating of the rotor cores 10A and 10B can be performed simultaneously and efficiently.

  Further, when the rotor cores 10A and 10B are induction-heated, the shielding portion 134 radially opposes the lower end portion of the outer diameter side coil 122 and the upper end portion of the outer diameter side coil 124. The temperature rise of the shielding portion 134 can be suppressed as compared with a portion that is radially opposed to any one of the central portions 122 and 124. Therefore, a cooling device for cooling the shielding portion 134 (for example, a device similar to the cooling device for cooling the shielding portion 130) can be omitted. Moreover, at this time, if the axial length of the outer diameter side coil 122 is designed so that the shielding portion 132 is radially opposed to the upper end portion of the outer diameter side coil 122 in the axial direction, the temperature rise of the shielding portion 132 is also suppressed. be able to.

  In the rotor core heating device 120 of the second embodiment described above, the outer diameter side coil 122 having a diameter larger than the outer diameter of the rotor core 10A, and the position where the outer diameter side coil 122 is displaced in the axial direction when viewed from the radial direction. And an outer-diameter coil 124 having a diameter larger than the outer diameter of the rotor core 10B and smaller than the outer-diameter coil 122; and an outer-diameter coil 122 having a diameter smaller than the inner diameter of the rotor cores 10A and 10B. , 124 and an inner diameter side coil 126 radially opposed to the inner diameter side coil 126. Thus, when the same device is used for rotor cores 10A and 10B having different outer diameters, induction heating of rotor cores 10A and 10B can be performed simultaneously and efficiently.

  In the rotor core heating device 120 of the second embodiment, the outer diameter side coils 122 and 124 are formed by one conductor, but may be formed by different conductors.

  In the rotor core heating device 120 of the second embodiment, the outer diameter coils 122 and 124 and the inner diameter coil 126 are energized by different power sources 140 and 144, but may be energized by the same power source. .

  In the rotor core heating device 120 of the second embodiment, the shielding portion 130, the shielding portion 132, and the shielding portion 134 have a plurality of projections 130a, a plurality of projections 132a, and a plurality of projections 134a, 134b, respectively. , May not have the plurality of protrusions 130a, 132a, 134a, 134b, respectively. In this case, the entire upper end surface of the shielding portion 130 contacts the entire lower end surface of the rotor core 10B, the entire lower end surface of the shielding portion 134 contacts the entire upper end surface of the rotor core 10B, and the entire upper end surface of the shielding portion 134 contacts the rotor core 10A. The entire lower end surface of the rotor core 10A comes into contact with the entire lower end surface of the rotor core 10A.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of “Means for Solving the Problems” will be described. In the first embodiment, the outer diameter coil 22 corresponds to the “first outer diameter coil”, the outer diameter coil 24 corresponds to the “second outer diameter coil”, and the inner diameter coil 26 corresponds to the “inner diameter coil”. Coil ". In the second embodiment, the outer diameter coil 122 corresponds to a “first outer diameter coil”, the outer diameter coil 124 corresponds to a “second outer diameter coil”, and the inner diameter coil 126 corresponds to an “inner diameter coil”. Coil ".

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of the means for solving the problem is as follows. This is merely an example for specifically describing an embodiment, and does not limit the elements of the invention described in the section of “Means for Solving the Problems”. That is, the interpretation of the invention described in the section of the means for solving the problem should be interpreted based on the description of the section, and the embodiment is not limited to the invention described in the section of the means for solving the problem. This is just a specific example.

  As described above, the embodiments for carrying out the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments at all, and various forms may be provided without departing from the gist of the present invention. Of course, it can be implemented.

  INDUSTRIAL APPLICABILITY The present invention is applicable to, for example, a manufacturing industry of a rotor core heating device.

  10A, 10B rotor core, 20, 120 rotor core heating device, 22, 24, 122, 124 outer diameter coil, 26, 126 inner diameter coil, 30, 32, 130, 132, 134 shielding part, 30a, 32a, 130a, 132a , 134a, 134b protrusion, 30b, 130b channel, 40, 44, 140, 144 power supply, 42, 46, 142, 146 switch.

Claims (2)

A rotor core heating device for induction heating a rotor core of an electric motor by an inner diameter side coil and an outer diameter side coil of an inner diameter side and an outer diameter side of the rotor core,
The outer diameter side coil includes a first outer diameter side coil and a second outer diameter side coil which is disposed at a position shifted in the axial direction when viewed from the radial direction and has a smaller diameter than the first outer diameter side coil. Have
The inner diameter side coil is movable in an axial direction,
Rotor core heating device. A rotor core heating device for induction heating a rotor core of an electric motor by an inner diameter side coil and an outer diameter side coil of an inner diameter side and an outer diameter side of the rotor core,
The outer diameter side coil includes a first outer diameter side coil and a second outer diameter side coil which is disposed at a position shifted in the axial direction when viewed from the radial direction and has a smaller diameter than the first outer diameter side coil. Have
The inner diameter side coil extends so as to radially oppose the first outer diameter side coil and the second outer diameter side coil,
Rotor core heating device.