JP6707392B2 - Rotor manufacturing method - Google Patents

Description

The present invention relates to a rotor manufacturing how.

Regarding a conventional method of manufacturing a rotor, for example, Japanese Patent Laid-Open No. 2002-64965 discloses that assembly is accurate, easy and low cost, and ferromagnetic particles from permanent magnets or permanent magnets are generated in an air gap during assembly work and operation. A rotor assembly is disclosed in which contaminants from the outside world do not invade, the rotation accuracy of the rotor is high, and the size is reduced (Patent Document 1).

The rotor assembly disclosed in Patent Document 1 is formed with a rotor having bearings at both ends thereof and permanent magnets formed on the rotor shaft, a receiving portion for hermetically receiving the bearings, and a space between these receiving portions. And a protective cylinder made of a sleeve. The rotor assembly is constructed with the rotor within a sleeve.

Further, Japanese Patent Laid-Open No. 2015-91202 discloses a rotor for the purpose of achieving weight reduction of the rotor and preventing lifting and scattering of the magnet during high-speed rotation (Patent Document 2). ..

The rotor disclosed in Patent Document 2 has a shaft, a magnet provided around the shaft, and a tubular shape, and is made of carbon fiber reinforced resin formed by winding and laminating carbon fibers along the outer peripheral direction of the magnet. A magnet lifting and scattering prevention member.

JP 2002-64965 A JP-A-2015-91202

As disclosed in the above-mentioned Patent Documents 1 and 2, a rotor in which a permanent magnet is provided on the outer circumference of a rotor core is known. Further, in the rotor disclosed in the above-mentioned Patent Document 2, a sleeve made of carbon fiber reinforced resin is provided so as to cover the outer periphery of the permanent magnet in order to prevent the permanent magnet from separating from the rotor core when the rotor rotates. There is.

In such a configuration, when the thermosetting resin is used as the base material of the carbon fiber reinforced resin, the step of winding the carbon fiber impregnated with the thermosetting resin on the outer circumference of the permanent magnet at the time of manufacturing the rotor, The step of heating the thermosetting resin is sequentially performed.

However, since the rotor core thermally expands when the thermosetting resin is heated, the sleeve is deformed in the radial direction due to the effect of the thermal expansion. In the subsequent temperature decrease process, the rotor core contracts, but the sleeve hardens in a state of being deformed in the radial direction, so that a gap is generated between the permanent magnet and the sleeve. In this case, the original function of the sleeve, that is, preventing the permanent magnet from being separated from the rotor core, cannot be fully exerted.

Accordingly, an object of the present invention is to solve the above problems, is to provide a manufacturing how the rotor to securely hold the permanent magnet by the rotor core.

A method of manufacturing a rotor according to one aspect of the present invention includes a step of disposing a permanent magnet on the outer circumference of a rotor core, and a holding member containing a thermosetting resin is provided on the outer circumference of the rotor core so as to cover the permanent magnet. And a step of holding the permanent magnet to the rotor core by the holding member by heating the thermosetting resin while cooling the rotor core. The rotor core is formed with a through hole that penetrates in the axial direction. The step of holding the permanent magnets on the rotor core includes the step of circulating the coolant along the through holes. The rotor core includes a plurality of electromagnetic steel plates laminated along the axial direction of the rotor core. The through hole is a bolt hole into which a bolt for integrally holding a plurality of electromagnetic steel plates is inserted.
A method for manufacturing a rotor according to another aspect of the present invention includes a step of disposing a permanent magnet on the outer circumference of a rotor core, and a holding member containing a thermosetting resin is provided on the outer circumference of the rotor core so as to cover the permanent magnet. And a step of holding the permanent magnet to the rotor core by the holding member by heating the thermosetting resin while cooling the rotor core. The rotor core includes a plurality of electromagnetic steel plates laminated along the axial direction of the rotor core. The rotor core is formed with bolt holes into which bolts for integrally holding a plurality of electromagnetic steel plates are inserted. The step of holding the permanent magnet on the rotor core includes the step of providing a refrigerant so that heat can be exchanged with the rotor core through the bolts inserted in the bolt holes.
A method of manufacturing a rotor according to still another aspect of the present invention includes a step of disposing a permanent magnet on the outer circumference of a rotor core, and a holding member containing a thermosetting resin on the outer circumference of the rotor core so as to cover the permanent magnet. The method includes a step of providing and a step of holding the permanent magnet to the rotor core by the holding member by heating the thermosetting resin while cooling the rotor core.

According to the method of manufacturing a rotor configured as described above, when the permanent magnet is held on the rotor core by the holding member, thermal expansion of the rotor core due to heating of the thermosetting resin is prevented by cooling the rotor core. Suppress by. As a result, deformation of the holding member in the radial direction is suppressed, so that the permanent magnet can be reliably held by the rotor core by the holding member.

Further, preferably, the rotor core is formed with a through hole penetrating in the axial direction thereof. The step of holding the permanent magnets on the rotor core includes the step of circulating the coolant along the through holes.

According to the method of manufacturing a rotor configured as described above, the rotor core can be cooled by using the through hole formed in the rotor core during the step of holding the permanent magnet in the rotor core by the holding member.

Further preferably, the rotor core includes a plurality of electromagnetic steel plates laminated along the axial direction thereof. The through hole is a bolt hole into which a bolt for integrally holding a plurality of electromagnetic steel plates is inserted.

According to the method of manufacturing a rotor configured as described above, during the step of holding the permanent magnets on the rotor core by the holding member, the bolt holes into which the bolts for holding the plurality of electromagnetic steel sheets are integrally inserted are used. The rotor core can be cooled.

Further, preferably, a hollow region penetrating in the axial direction of the rotor core is formed in the inner peripheral region of the rotor core. The step of holding the permanent magnet in the rotor core includes the step of circulating the coolant along the hollow region.

According to the method of manufacturing a rotor configured as described above, the rotor core can be cooled by using the hollow region formed in the inner peripheral region of the rotor core during the process of holding the permanent magnet on the rotor core by the holding member. it can.

Further preferably, the method of manufacturing the rotor core further includes a step of installing a heater on the outer periphery of the rotor core so as to face the holding member. The step of holding the permanent magnet on the rotor core includes the step of energizing the heater.

According to the rotor manufacturing method configured as described above, it is possible to efficiently heat the holding member and suppress the heat from the heater from being transmitted to the rotor core.

Further, preferably, during the step of holding the permanent magnet on the rotor core, the holding member is made of Fiber Reinforced Plastics to hold the permanent magnet on the rotor core.

According to the method of manufacturing a rotor configured as described above, the permanent magnet can be firmly held on the rotor core by the holding member made of fiber reinforced plastic.

Further preferably, the method of manufacturing the rotor core further includes a step of providing an intermediate member having a heat insulating property between the permanent magnet and the holding member on the outer circumference of the rotor core before the step of holding the permanent magnet in the rotor core.

According to the method of manufacturing a rotor configured as described above, heat transfer from the holding member to the rotor core can be suppressed by the intermediate member during the step of holding the permanent magnet on the rotor core by the holding member.

A rotor according to the present invention includes a rotor core, a permanent magnet arranged on the outer circumference of the rotor core, and a thermosetting resin, and is provided on the outer circumference of the rotor core so as to cover the permanent magnet and holds the permanent magnet on the rotor core. And a holding member, which has a heat insulating property, and is interposed between the permanent magnet and the holding member.

According to the rotor configured in this way, the permanent magnet can be reliably held by the rotor core by the holding member.

As described above, according to the present invention, it is possible to provide a manufacturing how the rotor to securely hold the permanent magnet by the rotor core.

FIG. 3 is a perspective view showing a rotor according to the first embodiment of the present invention. It is the figure which looked at the rotor along the II-II line in FIG. 1 from the arrow direction. FIG. 7 is a perspective view showing a first step of the method for manufacturing the rotor in the first embodiment of the present invention. FIG. 7 is a perspective view showing a second step of the method for manufacturing the rotor in the first embodiment of the present invention. FIG. 7 is a perspective view showing a third step of the method for manufacturing the rotor in the first embodiment of the present invention. FIG. 7 is a perspective view showing a fourth step of the method for manufacturing the rotor in the first embodiment of the present invention. It is sectional drawing which shows the modification of the process shown in FIG. 6 typically. It is a figure which shows the 5th process of the manufacturing method of the rotor in Embodiment 1 of this invention. It is a figure which shows the 6th process of the manufacturing method of the rotor in Embodiment 1 of this invention. It is a figure which shows the process of the manufacturing method of the rotor in a comparative example. It is a figure which shows the 1st modification of the method of cooling a rotor core. It is a figure which shows the 2nd modification of the method of cooling a rotor core.

Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are designated by the same reference numerals.

(Embodiment 1)
1 is a perspective view showing a rotor according to a first embodiment of the present invention. Referring to FIG. 1, rotor 10 in the present embodiment forms a motor by forming a pair with a stator (not shown) arranged with a gap on the outer circumference of rotor 10. The rotor 10 is used as a motor that rotationally drives a main shaft of a machining center.

The rotor 10 is supported so as to be rotatable about an imaginary central axis 101 shown in the drawing. When the motor is in operation, the rotor 10 rotates in the direction indicated by arrow 106 with the central axis 101 as the central axis of rotation. The maximum rotation speed of the rotor 10 is, for example, 10,000 rpm or more.

FIG. 2 is a view of the rotor taken along the line II-II in FIG. 1 as viewed from the direction of the arrow. With reference to FIGS. 1 and 2, the rotor 10 includes a shaft 14, a rotor core 21, a plurality of permanent magnets 31, a heat insulating material 51, and a sleeve 41.

The rotor core 21 has a cylindrical shape. The rotor core 21 has a shape that extends in a cylindrical shape around the central axis 101 in the axial direction. The rotor core 21 has an end face 23 and an end face 24. The end surface 23 and the end surface 24 are respectively arranged at one end and the other end of the rotor core 21 in the axial direction of the central shaft 101. The end face 23 and the end face 24 extend in a plane orthogonal to the central axis 101.

The rotor core 21 is made of a magnetic material. In the present embodiment, rotor core 21 has a plurality of electromagnetic steel plates and a plurality of bolts 27. The rotor core 21 is configured by stacking a plurality of electromagnetic steel plates in the axial direction of the central shaft 101.

A plurality of bolt holes (not shown) are formed in the rotor core 21. The bolt hole extends in the axial direction of the central shaft 101 and penetrates the rotor core 21. The bolt holes open at the end faces 23 and 24 at both ends of the rotor core 21 in the axial direction of the central shaft 101. The plurality of bolt holes are provided at intervals in the circumferential direction (rotational direction of the rotor 10) about the central axis 101. The plurality of bolt holes are provided at equal intervals in the circumferential direction around the central axis 101.

A bolt 27 is inserted into the bolt hole from the end surface 23 side of the rotor core 21. A nut (not shown) is screwed into the bolt 27 from the end face 24 side of the rotor core 21 to integrally fasten the plurality of electromagnetic steel plates.

The means for fastening the plurality of electromagnetic steel plates is not particularly limited, and for example, a ring member having a female screw may be used instead of the above nut.

The shaft 14 as a whole has a shape that extends cylindrically around the central axis 101 in the axial direction. The shaft 14 is fitted on the inner peripheral side of the rotor core 21. The shaft 14 is provided so as to project from the end surface 23 and the end surface 24 in the axial direction of the central axis 101. The shaft 14 is made of metal. The shaft 14 rotates together with the rotor core 21 when the motor is operating.

The plurality of permanent magnets 31 are provided on the outer circumference of the rotor core 21. The plurality of permanent magnets 31 are arranged at intervals in the circumferential direction around the central axis 101. The permanent magnet 31 is bonded to the outer peripheral surface of the rotor core 21 with an adhesive. The permanent magnet 31 has a rectangular shape when viewed in the radial direction of the central axis 101.

The sleeve 41 has a shape extending in a cylindrical shape around the central axis 101 in the axial direction. The length of the sleeve 41 in the axial direction of the central shaft 101 is the same as the length of the rotor core 21 in the same direction. The sleeve 41 is provided on the outer circumference of the rotor core 21 so as to cover the permanent magnet 31. The sleeve 41 has a thin shape in the radial direction of the central axis 101. The sleeve 41 has a function of holding the permanent magnet 31 on the rotor core 21.

The sleeve 41 contains a thermosetting resin. More specifically, the sleeve 41 is made of fiber reinforced plastics, and a thermosetting resin is used as a base material of the FRP. Examples of the fiber reinforced plastic include carbon fiber reinforced plastic (CFPR) using carbon fiber and glass fiber reinforced plastic (GFRP) using glass fiber. Examples of thermosetting resins include epoxy resins and vinyl ester resins. The thermosetting resin is not limited to the heat curable type, and may be a room temperature curable type. Even in this case, heat treatment is performed at the time of manufacturing the rotor 10 in order to raise the glass transition temperature of the thermosetting resin.

The heat insulating material 51 has a shape that extends cylindrically around the central axis 101 in the axial direction. The length of the heat insulating material 51 in the axial direction of the central axis 101 is the same as the length of the rotor core 21 in the same direction. The heat insulating material 51 has a thin shape in the radial direction of the central axis 101. The heat insulating material 51 is interposed between the permanent magnet 31 and the sleeve 41 in the radial direction of the central axis 101.

The heat insulating material 51 has heat insulating performance. As the heat insulating material 51, a product containing silica (SiO ₂ ) (for example, silica cloth) can be typically used. When silica cloth is used as the heat insulating material, the air layer included in the silica cloth exhibits high heat insulating performance. The heat insulating material 51 preferably maintains high heat insulating performance even when it is compressed and deformed in the radial direction of the central axis 101.

3 to 6 are perspective views showing steps of the method for manufacturing the rotor according to the first embodiment of the present invention. Next, a step of manufacturing rotor 10 in FIG. 1 by the method of manufacturing a rotor according to the first embodiment of the present invention will be described.

Referring to FIG. 3, first, rotor core 21 is manufactured. More specifically, a plurality of electromagnetic steel plates are laminated in one direction. By inserting a bolt 27 into a bolt hole (not shown) and tightening a nut on the bolt 27, a plurality of electromagnetic steel plates are integrally fastened.

With reference to FIG. 4, next, the shaft 14 is inserted into the inner peripheral side of the rotor core 21. The shaft 14 is fixed to the rotor core 21 by shrink fitting. Referring to FIG. 5, next, permanent magnet 31 is arranged on the outer periphery of rotor core 21. More specifically, a plurality of permanent magnets 31 are attached to the outer peripheral surface of the rotor core 21.

Next, referring to FIG. 6, the bolt 27 is removed from the bolt hole 25. At this time, since the shaft 14 is fitted to the inner peripheral side of the rotor core 21, the plurality of electromagnetic steel plates are held together without being separated.

FIG. 7 is a cross-sectional view schematically showing a modified example of the process shown in FIG. Referring to FIG. 7, when shaft 14 is not fitted to the inner peripheral side of rotor core 21, a jig for integrally holding a plurality of electromagnetic steel plates may be used.

More specifically, the jig is composed of a jig body 71 and a lid 73. The jig body 71 has a cylindrical portion 72 and a flange portion 74 as its constituent parts. The cylindrical portion 72 has a cylindrical shape. The brim portion 74 extends in a brim shape from an end portion of the cylindrical portion 72 in the axial direction. The lid 73 has a disc shape.

The cylindrical portion 72 is inserted into the inner peripheral side of the rotor core 21 from the end surface 24 side of the rotor core 21. The lid 73 is assembled to the jig body 71 (cylindrical portion 72) from the end surface 23 side of the rotor core 21. By fastening the lid portion 73 to the jig main body 71 (cylindrical portion 72) using bolts (not shown), there is a space between the lid portion 73 and the collar portion 74 in the axial direction of the rotor core 21 (direction indicated by an arrow). Generate a tightening force. Thereby, a plurality of electromagnetic steel plates can be held in one by a jig.

8 and 9 are diagrams showing steps of the method for manufacturing the rotor according to the first embodiment of the present invention. 8 and 9 are views corresponding to FIG. 2 showing the structure of the rotor 10.

Referring to FIG. 8, next, heat insulating material 51 is arranged on the outer circumference of permanent magnet 31. For example, when silica cloth is used as the heat insulating material 51, the silica cloth is wound around the outer circumference of the permanent magnet 31.

Next, a sleeve 41 containing a thermosetting resin is provided on the outer circumference of the rotor core 21 so as to cover the permanent magnet 31. More specifically, a fiber impregnated with a thermosetting resin is prepared, and the fiber is wound on the outer periphery of the heat insulating material 51 in multiple layers (filament winding method).

With reference to FIG. 9, next, the cooling pipe 61 is inserted into the bolt hole 25. The cooling pipe 61 is composed of a pipe member extending in one direction. The cooling pipe 61 is preferably in surface contact with the inner peripheral surface of the bolt hole 25. The cooling pipe 61 is preferably made of a material having high thermal conductivity (eg, copper).

A heater 66 is installed on the outer circumference of the rotor core 21 so as to face the sleeve 41. As the heater 66, it is preferable to use a planar heater having a cylindrical shape with a diameter larger than that of the sleeve 41.

Next, while the rotor core 21 is being cooled, the thermosetting resin contained in the sleeve 41 is heated so that the sleeve 41 holds the permanent magnet 31 in the rotor core 21.

More specifically, the coolant is circulated through the cooling pipe 61 to cool the rotor core 21. By energizing the heater 66, the thermosetting resin contained in the sleeve 41 is heated. By curing the heated thermosetting resin, the sleeve 41 becomes a fiber reinforced plastic and holds the permanent magnet 31 on the rotor core 21.

With reference to FIG. 1, next, the cooling pipe 61 is removed from the bolt hole 25. The bolt 27 is inserted into the bolt hole 25 from which the cooling pipe 61 is removed, and the nut is tightened in the bolt 27. Through the above steps, the rotor 10 shown in FIG. 1 is completed.

In the rotor manufacturing method of the present invention, the heat insulating material 51 interposed between the permanent magnet 31 and the sleeve 41 is not an essential component. The holes for arranging the cooling pipes 61 are not limited to the bolt holes 25. A through hole for disposing the cooling pipe 61 may be provided separately from the bolt hole 25.

Next, the operational effects achieved by the rotor 10 and the method for manufacturing the rotor according to the first embodiment of the present invention described above will be described together with the problems in the comparative example.

Referring to FIG. 1, when the rotor 10 rotates at a high speed, an excessive centrifugal force (force in the direction indicated by the arrow 107 in FIG. 1) acts on the permanent magnet 31. The sleeve 41 is provided to prevent the permanent magnet 31 from being separated from the rotor core 21 by this centrifugal force.

FIG. 10 is a diagram showing steps of a method for manufacturing a rotor in a comparative example. Referring to FIG. 10, in this comparative example, rotor core 21 is not cooled when the thermosetting resin contained in sleeve 41 is heated.

The rotor core 21 is thermally expanded by the heating of the thermosetting resin contained in the sleeve 41, so that the sleeve 41 is deformed in the radial direction due to the influence thereof (second stage diagram). In the subsequent temperature decrease process, the rotor core 21 contracts, but the sleeve 41 hardens in a state of being deformed in the radial expansion direction, so that a gap is generated between the permanent magnet 31 and the sleeve 41 (third stage). Figure). In this case, the function of the sleeve 41 that prevents the permanent magnet 31 from separating from the rotor core 21 is not exerted.

With reference to FIG. 9, in the present embodiment, on the other hand, during the step of holding permanent magnet 31 on rotor core 21 by sleeve 41, at the same time as heating the thermosetting resin contained in sleeve 41, rotor core 21 Cool down. As a result, thermal expansion of the rotor core 21 is suppressed, so that the sleeve 41 can be prevented from being deformed in the radial direction. As a result, since no gap is created between the permanent magnet 31 and the sleeve 41 after the temperature lowering process, the permanent magnet 31 can be reliably held by the rotor core 21 by the sleeve 41.

Further, in the present embodiment, a heat insulating material 51 having heat insulating performance is arranged between the permanent magnet 31 and the sleeve 41. As a result, during the process of holding the permanent magnet 31 on the rotor core 21 by the sleeve 41, heat conduction from the sleeve 41 to the rotor core 21 is blocked by the heat insulating material 51. As a result, thermal expansion of the rotor core 21 can be suppressed more effectively.

Further, when the temperature of the permanent magnet 31 rises due to the radiant heat from the stator generated during the operation of the motor, there is a possibility that the permanent magnet 31 may be demagnetized (the magnetic force is removed). On the other hand, in the rotor 10 of the present embodiment, the heat insulating material 51 having heat insulating performance is arranged between the permanent magnet 31 and the sleeve 41. With such a configuration, it is possible to prevent the demagnetization phenomenon from occurring in the permanent magnet 31 and improve the motor characteristics.

The structure of the rotor 10 according to the first embodiment of the present invention described above will be collectively described. The rotor 10 according to the present embodiment includes a rotor core 21, a permanent magnet 31 arranged on the outer periphery of the rotor core 21, A sleeve 41 as a holding member that includes a thermosetting resin and is provided on the outer circumference of the rotor core 21 so as to cover the permanent magnet 31 and that holds the permanent magnet 31 on the rotor core 21, and has a heat insulating property. The heat insulating material 51 is provided as an intermediate member interposed between the heat insulating materials 41.

In addition, the method of manufacturing the rotor according to the present embodiment includes a step of disposing the permanent magnet 31 on the outer periphery of the rotor core 21, and a sleeve 41 as a holding member containing a thermosetting resin so as to cover the permanent magnet 31. 21, a step of providing the permanent magnet 31 on the rotor core 21 by the sleeve 41 by heating the thermosetting resin while cooling the rotor core 21.

According to the rotor 10 and the method of manufacturing the rotor in the first embodiment of the present invention thus configured, it is possible to prevent a gap from being generated between the permanent magnet 31 and the sleeve 41 when manufacturing the rotor. Thereby, the permanent magnet 31 can be reliably held by the rotor core 21 by the sleeve 41.

In the present embodiment, the case where the present invention is applied to the rotor for a spindle motor of a machine tool has been described, but the present invention is not limited to such a case, and for example, the present invention can be applied to a motor used for general industrial machines. It is also possible to apply.

(Embodiment 2)
In the present embodiment, various modifications of the method of cooling rotor core 21 in the step of holding permanent magnet 31 on rotor core 21 by sleeve 41 in the first embodiment (step shown in FIG. 9) will be described.

11 and 12 are views showing a modified example of the method for cooling the rotor core. 11 and 12 are diagrams corresponding to FIG. 9 in the first embodiment.

Referring to FIG. 11, a cavity region 81 is formed in the inner peripheral region of rotor core 21. More specifically, the hollow region 81 is a region inside the shaft 14 fitted to the inner peripheral side of the rotor core 21. In the present modification, the rotor core 21 is cooled by circulating the refrigerant along the cavity region 81 during the step of holding the permanent magnet 31 on the rotor core 21 by the sleeve 41.

In addition, when the rotor core 21 is formed of, for example, a dust core and the shaft 14 is not fitted to the inner peripheral side of the rotor core 21, the refrigerant is introduced along the hollow region inside the rotor core 21. It may be distributed.

Referring to FIG. 12, in the present modification, a refrigerant is provided so that heat can be exchanged with rotor core 21 through bolts 27 inserted in the bolt holes during the process of holding permanent magnet 31 on rotor core 21 by sleeve 41. The rotor core 21 is cooled by.

More specifically, the cooling pipe 86 is installed on the end surface 23 of the rotor core 21 so as to abut against the plurality of bolts 27, and the refrigerant is circulated through the cooling pipe 86.

The cooling pipe 86 has, as its constituent parts, a circumferential portion 89 extending in the circumferential direction, and a refrigerant supply portion 87 and a refrigerant discharge portion 88 provided at both ends of the circumferential portion 89. The cooling pipe 86 is installed so that the circumferential portion 89 contacts the head of the bolt 27 in the axial direction of the rotor core 21. The refrigerant supplied from the refrigerant supply unit 87 flows through the circumferential portion 89, and then is discharged from the refrigerant discharge unit 88. The rotor core 21 exchanges heat with the refrigerant flowing through the circumferential portion 89 through the bolt 27.

According to the rotor manufacturing method of the second embodiment of the present invention thus configured, the effects described in the first embodiment can be similarly obtained.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

The present invention is applied to, for example, a motor that rotationally drives a spindle of a machining center.

10 rotor, 14 shaft, 21 rotor core, 23, 24 end face, 25 bolt hole, 27 bolt, 31 permanent magnet, 41 sleeve, 51 heat insulating material, 61,86 cooling pipe, 66 heater, 71 jig body, 72 cylindrical portion, 73 Lid part, 74 Collar part, 81 Cavity area, 87 Refrigerant supply part, 88 Refrigerant discharge part, 89 Circumferential part, 101 Central axis.

Claims (6)

Placing a permanent magnet on the outer periphery of the rotor core,
A step of providing a holding member containing a thermosetting resin on the outer circumference of the rotor core so as to cover the permanent magnet,
Heating the thermosetting resin while cooling the rotor core, thereby holding the permanent magnet on the rotor core by the holding member ,
The rotor core is formed with a through hole penetrating in the axial direction thereof,
The step of holding the permanent magnet on the rotor core includes a step of circulating a refrigerant along the through hole,
The rotor core includes a plurality of electromagnetic steel plates laminated along the axial direction thereof,
The method of manufacturing a rotor, wherein the through hole is a bolt hole into which a bolt for integrally holding the plurality of electromagnetic steel plates is inserted . A cavity region is formed in the inner peripheral region of the rotor core, the cavity region penetrating in the axial direction of the rotor core,
The method of manufacturing a rotor according to claim 1, wherein the step of holding the permanent magnet in the rotor core includes the step of circulating a coolant along the hollow region. Further comprising a step of installing a heater on the outer periphery of the rotor core so as to face the holding member,
The step of holding the permanent magnet in the rotor core includes the step of energizing the heater, the manufacturing method of the rotor according to claim 1 or 2. In the step of holding the permanent magnet on the rotor core, the holding member is made of fiber reinforced plastics (Fiber Reinforced Plastics) to hold the permanent magnet on the rotor core.
The rotor manufacturing method according to any one of claims 1 to 3. Before the step of holding the permanent magnet in the rotor core, on the outer periphery of the rotor core, further comprising an intermediate member having a thermal insulation performance between the permanent magnet and the holding member, one of claims 1 to 4 2. The method for manufacturing a rotor according to item 1. Placing a permanent magnet on the outer periphery of the rotor core,
A step of providing a holding member containing a thermosetting resin on the outer circumference of the rotor core so as to cover the permanent magnet,
Heating the thermosetting resin while cooling the rotor core, thereby holding the permanent magnet on the rotor core by the holding member,
The rotor core includes a plurality of electromagnetic steel plates laminated along the axial direction thereof,
The rotor core is formed with bolt holes into which bolts for integrally holding the plurality of electromagnetic steel plates are inserted,
The step of holding the permanent magnet on the rotor core includes a step of providing a refrigerant so that heat can be exchanged with the rotor core through a bolt inserted in the bolt hole.

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