JP2015002572A - Manufacturing jig for rotor for rotating electrical machine and method for manufacturing rotor for rotating electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing jig for a rotor for a rotary electric machine capable of concentrically assembling a rotary shaft and a rotor core by providing a magnetic force generation jig with which magnetic poles are disposed, coaxially with the rotary shaft in an outer circumference of the rotor core, and a manufacturing method of the rotor for the rotary electric machine.SOLUTION: A magnetic force generation jig 20 is formed cylindrically, and a plurality of permanent magnets 21 in a rectangular plate shape are internally disposed in an axial direction. Regarding the permanent magnets 21, the permanent magnets 21 of N poles are magnetized at equal intervals in a circumferential direction so as to be neighboring to the permanent magnets 21 of S poles. The magnetic force generation jig 20 is fixed at an outer circumferential side of a rotor core 2 coaxially to a rotary shaft 7 in such a manner that the same magnetic poles as the magnetic poles of the rotor core 2 oppose each other. Thus, a magnetic force generated between the magnetic pole of the rotor core 2 and the magnetic pole of the magnetic force generation jig 20 becomes a repulsive force, the rotor core 2 is moved in a radial direction, and core alignment with the rotary shaft 7 is performed.

Description

  The present invention relates to a rotor for a rotating electrical machine and a method for manufacturing the rotor for a rotating electrical machine.

  Conventionally, a rotor for a permanent magnet type rotating electrical machine such as an electric motor has a structure in which serration or the like is processed on the outer periphery of an output shaft (rotating shaft) and a rotor core is press-fitted into the rotating shaft to prevent relative rotation. Are known. However, when the press-fitting distance of the rotating shaft is increased, the serration of the press-fitting portion is likely to buckle and the holding force is reduced, so that the rotor core cannot be reliably fixed to the rotating shaft. Therefore, a rotor core is constituted by a plurality of divided cores in which permanent magnets are arranged, and a rotor for a rotating electrical machine is formed by inserting a plurality of divided cores into a rotating shaft and connecting them together (for example, a patent) Reference 1).

JP 2007-1229892 A

  In the rotor for a rotating electrical machine as described above, a reference phase portion made of, for example, a key groove is formed on the outer peripheral portion of the rotating shaft, and the key provided on the inner peripheral portion of the rotor core is in relation to the reference phase portion. By fixing the rotating shaft to the rotating shaft so as to have a predetermined phase, the rotating shaft and the rotor core are fixed integrally by adjusting the phase (circumferential position). However, since the outer periphery of the rotating shaft and the inner periphery of the rotor core are fitted with a gap, when the rotor core is fixed in a state of being offset from the rotating shaft when the rotor for a rotating electrical machine is assembled, the rotating shaft And the rotor core may not be able to secure the same axis (concentricity). As a result, the shafts of the rotor for the rotating electrical machine and the stator are decentered, the magnetic balance is lost, and abnormal noise and vibration of the electric motor may occur. Further, when the gap between the rotor for the rotating electrical machine and the stator is increased, the rotating electrical machine is increased in size.

  The present invention has been made in order to solve the above-described problems. The purpose of the present invention is to provide a magnetic force generating jig in which magnetic poles are arranged on the outer periphery of the rotor core so that the rotary shaft and the rotor core are aligned with each other. An object of the present invention is to provide a rotating electrical machine rotor manufacturing jig and a rotating electrical machine rotor manufacturing method that can be assembled while ensuring concentricity.

  In order to solve the above problems, the invention according to claim 1 is formed by a rotating shaft of a rotating electrical machine and a plurality of laminated ferromagnetic plates, and permanent magnets are provided in a plurality of axially formed slots. A key that is housed and protruded radially inward on the inner peripheral surface is fitted into a key groove formed in the outer peripheral surface of the rotary shaft so as to be recessed inward in the radial direction, thereby regulating the phase of the rotary shaft. And a rotor core that is integrally fitted with a gap between the rotor core and the rotor core, wherein the rotor core is formed in a cylindrical shape and disposed on the outer peripheral side of the rotor core. The gist is that a magnetic force generating jig for centering the rotating shaft and the rotor core is provided by being fixed coaxially.

  According to the above configuration, the magnetic pole of the permanent magnet housed and fixed in the rotor core that is fitted to the rotary shaft with a gap, and the magnetic pole disposed in the magnetic force generating jig fixed coaxially with the rotary shaft on the outer periphery side of the rotor core Since the magnetic force acts between the two, the radial position of the rotor core relative to the rotation axis can be changed. As a result, when a repulsive force acts between the magnetic force generating jig and the magnetic poles of the rotor core, the rotor core moves in the radial direction and the gap is adjusted uniformly, so that the rotating shaft and the rotor core are concentric. It becomes possible to assemble. Moreover, since the gap width between the rotor and the stator of the rotating electrical machine can be kept constant over the entire circumference, the rotating electrical machine can be reduced in size.

  According to a second aspect of the present invention, in the rotor manufacturing jig according to the first aspect, the magnetic force generating jig is disposed so that the same magnetic pole as the magnetic pole of the rotor core is opposed. The gist. According to the above configuration, the magnetic poles of the magnetic force generating jig are arranged so that the same magnetic poles as the magnetic poles of the rotor core are opposed to each other, so that a repulsive force acts between the rotor core and the magnetic force generating jig. Moves in the radial direction. As a result, the rotating shaft and the rotor core can be assembled while ensuring concentricity.

  According to a third aspect of the present invention, a permanent magnet is accommodated in a plurality of slots formed in the axial direction, which is formed by a rotating shaft of a rotating electrical machine and a plurality of laminated ferromagnetic plates, and a gap is formed between the rotating shafts. And a rotor core fitted and fixed integrally therewith, wherein a key formed on the inner peripheral surface of the rotor core so as to protrude radially inward is formed on the outer peripheral surface of the rotary shaft. A rotor core temporarily assembling step for temporarily assembling the rotor core to the rotating shaft by being fitted in a key groove formed to be recessed radially inward, and the same as the magnetic pole of the rotor core on the outer periphery of the rotor core A cylindrical magnetic force generating jig is fixed coaxially with the rotating shaft so that the magnetic poles of the rotor core are opposed to each other, and the rotor core is generated by the magnetic force generated between the magnetic pole of the rotor core and the magnetic pole of the magnetic force generating jig. And a rotor core centering step to center to repel said magnetic force generating tool, the rotor assembly step of fixing the rotor core and the rotating shaft, and summarized in that with a.

  According to the above configuration, after the rotor core is temporarily assembled to the rotating shaft, the magnetic force generating jig on which the magnetic poles are arranged is fixed to the outer periphery of the rotor core coaxially with the rotating shaft. At this time, since a magnetic force acts between the magnetic pole in the magnetic force generating jig and the magnetic pole of the permanent magnet in the rotor core that is fitted to the rotary shaft, the rotor core moves to change the radial position of the rotor core relative to the rotary shaft. To do. As a result, when a repulsive force acts between the same magnetic poles of the magnetic force generating jig and the rotor core, the rotor core moves in the radial direction and the gap is adjusted uniformly, so that the rotating shaft and the rotor core are concentric. Thus, the rotor for the rotating electrical machine can be assembled.

  According to the present invention, by providing a magnetic force generating jig in which magnetic poles are arranged on the outer periphery of the rotor core, coaxially with the rotating shaft, the rotating shaft and the rotor core can be assembled while securing the concentricity. A tool and a method for manufacturing a rotor for a rotating electrical machine can be provided.

The longitudinal cross-sectional view along the axial direction of the rotor for rotary electric machines. The side view seen from the arrow A direction in FIG. Sectional drawing orthogonal to the axial direction of the rotor for rotary electric machines and a magnetic force generation jig (BB sectional drawing of FIG. 1). Sectional drawing along the axial direction which shows schematic structure of the rotor for rotary electric machines, and a magnetic force generation jig | tool. The flowchart which shows the assembly | attachment procedure of the rotor for rotary electric machines.

  Next, as a rotor used in the rotating electrical machine according to the embodiment of the present invention, a rotor of an IPM motor will be described with reference to the drawings. In the following description, the axial direction and the radial direction refer to the axial direction and the radial direction of the rotor 1 for a rotating electrical machine (rotor core 2).

  FIG. 1 is a longitudinal sectional view along the axial direction of a rotor 1 for a rotating electrical machine according to a first embodiment of the present invention, and FIG. 2 is a side view of the rotor 1 for a rotating electrical machine viewed from the direction A in FIG. is there. A rotating electrical machine (IPM motor) is mounted on a vehicle and used as an electric motor for a driving source such as an electric power steering device for assisting a steering operation or an electric four-wheel drive device for generating a driving force. As shown in FIG. 1, a rotor 1 for a rotating electrical machine includes a rotating shaft (shaft) 7 of the rotating electrical machine, a columnar rotor core 2 that includes a permanent magnet 3 and is fixed so as to be integrally rotatable with the rotating shaft 7, and a rotor core And side plates 13 a and 13 b for fixing 2 to the rotary shaft 7 and a bolt 10.

  The rotating shaft 7 is formed in a columnar shape, and both ends thereof are rotatably supported via bearings (not shown) provided in a motor housing (not shown). A key groove 8 extending in the axial direction and opening outward in the radial direction is formed on the outer peripheral surface of the central portion of the rotating shaft 7 facing the rotor core 2. The rotating shaft 7 is adapted to be phased with respect to the rotating shaft 7 by engaging the key 9 formed on the inner circumferential surface of the rotor core 2 and projecting radially inward in the key groove 8. The two permanent magnets 3 are in relative phase.

  A plurality of (in this embodiment, twelve, see FIG. 3) permanent magnets 3 are respectively embedded and fixed to the rotor core 2. That is, the rotor 1 for a rotating electrical machine according to the present embodiment is configured as a so-called embedded magnet type rotor. The rotating electrical machine configured as described above has a magnetic attractive force and a repulsive force generated between a rotating magnetic field formed by supplying driving power to each coil of a stator (not shown) and a magnetic flux of the permanent magnet 3. Thus, the rotor 1 for rotating electrical machines is configured to rotate.

  The rotor core 2 has a plurality of thin disc-shaped rotor plates 4 made of a soft magnetic material (for example, iron or electromagnetic steel plate) laminated in the axial direction, and has an insertion hole 6 into which the rotating shaft 7 is inserted. It is formed in a cylindrical shape. In the rotor core 2, for example, a plurality of slots 5 (12 in this embodiment, see FIG. 3) in which rectangular plate-shaped permanent magnets 3 are respectively arranged are formed. In addition, the slot 5 of this embodiment is formed in the hole (cavity) shape which has substantially the same cross-sectional shape as the cross-sectional shape of the permanent magnet 3, respectively. The permanent magnets 3 are respectively accommodated in the slots 5 formed in the vicinity of the outer peripheral edge of the rotor core 2 at intervals of 30 degrees in the axial direction, and are fixedly held on the rotor core 2.

  Here, the permanent magnet 3 is magnetized (attached) so that the permanent magnet 3 of one polarity (for example, N pole) is adjacent to the permanent magnet 3 of the other polarity (for example, S pole) at equal intervals in the circumferential direction. Magnetized). The permanent magnet 3 is magnetized in a direction substantially along each plate thickness direction, and the outer peripheral edge of the rotor core 2 is a magnetic path through which the magnetic flux of the permanent magnet 3 passes. Note that a segment magnet made of a sintered magnet (for example, neodymium) is used for the permanent magnet 3 of the present embodiment, and the permanent magnet 3 is magnetized after being disposed and fixed in the slot 5. Alternatively, the previously magnetized material may be disposed and fixed in the slot 5.

  In the present embodiment, the rotor core 2 has three stages (divided) cores 2 a, 2 b, and 2 c that are divided into three stages in the axial direction by fitting the key 9 and the key groove 8 together in the circumferential direction. It is formed by stacking. In addition, the outer peripheral surface of the rotating shaft 7 and the inner peripheral surface of the rotor core 2 are coupled by gap fitting having a slight gap. The rotor core 2 is inserted into the rotary shaft 7 in the direction indicated by the arrow in FIG. 1, and one end (left side in FIG. 1) of the split core 2a is in contact with and fixed to the side plate 13a.

  A key 9 serving as a reference for fixing the split cores 2a, 2b, and 2c with a predetermined phase to the rotating shaft 7 protruding outward in the radial direction is disposed and formed parallel to the axial direction. ing. The divided cores 2a, 2b, and 2c are formed in the same shape, and the rotor core 2 is formed by matching the phases. That is, the permanent magnets 3 in the split cores 2a, 2b, 2c are arranged in a straight line with respect to the axial direction.

  The rotor core 2 is sandwiched between disk-shaped side plates 13 a and 13 b that are press-fitted into the rotary shaft 7 at both end surfaces in the axial direction. Then, a plurality (six in this embodiment) of bolts 10 arranged at equal intervals in the circumferential direction pass through the bolt holes 14 drilled in the axial direction in the rotor core 2 and the side plates 13a and 13b, and the rotation shaft 7, the rotor core 2 and the rotary shaft 7 are fastened and fixed by screwing with a female screw 14 formed on a flange 12 provided on the output shaft side (left side in FIG. 1). The rotor 1 for rotating electrical machines is assembled as described above.

Next, assembly of the rotating shaft 7 and the rotor core 2 will be described.
3 is a cross-sectional view orthogonal to the axial direction of the rotor 1 for a rotating electrical machine and the magnetic force generation jig 20 (cross-sectional view taken along the line BB in FIG. 1), and FIG. It is sectional drawing along the axial direction which shows schematic structure of these. As shown in FIGS. 3 and 4, the magnetic force generation jig 20 is formed in a cylindrical shape, and in the axial direction, the same number of permanent magnets 3 in the rotor core 2, for example, a plurality of rectangular plate shapes (this embodiment) Then, 12) permanent magnets 21 are arranged inside. The permanent magnet 21 is magnetized (magnetized) so that the permanent magnet 21 of one polarity (for example, N pole) is adjacent to the permanent magnet 21 of the other polarity (for example, S pole) at equal intervals in the circumferential direction. ing. In addition, the segment magnet which consists of a sintered magnet (for example, neodymium etc.) is used for the permanent magnet 21 of this embodiment. The rotating shaft 7 and the magnetic force generating jig 20 are attached to a support base 22 and the rotor 1 for a rotating electrical machine is assembled.

  The magnetic force generating jig 20 has a predetermined air gap on the outer peripheral side of the rotor core 2 so that the same magnetic pole (for example, N pole) as the magnetic pole (for example, N pole) of the rotor core 2 faces the rotating shaft 7. Are arranged concentrically. At this time, the magnetic force generated between the magnetic pole of the rotor core 2 and the magnetic pole of the magnetic force generating jig 20 is arranged to be a repulsive force, and centering is performed while the magnetic force generating jig 20 and the rotor core 2 are repelled. It is carried out. Note that the magnetic force is inversely proportional to the square of the distance between the magnetic poles, and the rotor core 2 is arranged so that the air gap size in each circumferential part is uniform because a large repulsive force acts in a portion where the air gap is narrow during assembly. Centering with respect to the shaft 7 becomes possible.

FIG. 5 is a flowchart showing a procedure for assembling the rotor 1 for a rotating electrical machine.
First, the rotating shaft 7 is fixed to the support base 22 (step S501), and the side plate 13a is press-fitted into the rotating shaft 7 and brought into contact with the flange 12 provided on one end face (output shaft) side of the rotating shaft 7, and then divided. Each key 9 of the cores 2a, 2b, 2c is engaged with the key groove 8 of the rotating shaft 7, the divided cores 2a, 2b, 2c are inserted in order, and the rotor core 2 is temporarily assembled to the rotating shaft 7 (rotor core temporary assembly). Process, step S502).

  Subsequently, a phase out step for adjusting the magnetic force generating jig 20 to a predetermined angle with respect to the rotor core 2 is performed. First, the magnetic force generating jig 20 is installed and fixed on the support base 22 so as to be coaxial with the rotating shaft 7 (step S503). At this time, the magnetic force generating jig 20 is disposed with a predetermined air gap on the outer peripheral side of the rotor core 2 so that the same magnetic pole as the magnetic pole of the rotor core 2 faces. Then, the rotor core 2 and the magnetic force generation jig 20 are centered while being repelled (rotor core centering step, step S504).

  Next, an assembling step for assembling the rotating electrical machine rotor 1 is performed. A side plate 13b is press-fitted into the other end surface side (the side opposite to the flange 12) of the rotary shaft 7 to sandwich the rotor core 2 between the side plates 13a and 13b, and the bolt 10 is drilled in the rotor core 2 and the side plates 13a and 13b in the axial direction. The rotor core 2 and the rotary shaft 7 are fastened and fixed by passing through the bolt holes 11 and screwing into the female screws 14 formed on the flange 12. Thus, the rotor 1 for rotating electrical machines is assembled (rotor assembly step, step S505). After the assembly, the rotating electrical machine rotor 1 is detached from the magnetic force generation jig 20 and the support base 22.

  Next, the operation and effects of the manufacturing jig for the rotor 1 for a rotating electrical machine according to the embodiment of the present invention configured as described above will be described.

  According to the configuration of the present embodiment, the magnetic pole of the permanent magnet 3 disposed in the rotor core 2 that is fitted to the outer peripheral surface of the rotating shaft 7 and the outer peripheral side of the rotor core 2 are fixed coaxially with the rotating shaft 7. Magnetic force is generated between the magnetic poles of the permanent magnet 21 in the magnetic force generation jig 20. At this time, since a repulsive force works between the same magnetic poles, the rotor core 2 moves and the radial position of the rotor core 2 with respect to the rotating shaft 7 changes. In addition, the rotor core 2 is configured such that the keys 9 formed on the inner peripheral surfaces of a plurality of (three in this embodiment) split cores 2a, 2b, and 2c obtained by dividing the rotor core 2 in the axial direction are arranged in order on the outer peripheral surface of the rotary shaft 7. It is formed by engaging the key groove 8 formed in the above and stacking on the rotary shaft 7.

  Thereby, when a repulsive force acts between the magnetic poles of the magnetic force generating jig 20 and the rotor core 2, the rotor core 2 moves in the radial direction and the gap is uniformly adjusted. It becomes possible to secure the concentricity and assemble. Moreover, since the gap width between the rotor 1 of the rotating electrical machine and the stator can be kept constant over the entire circumference, the radial direction of the rotating electrical machine can be reduced in size. Furthermore, even when the axial length of the rotating electrical machine is increased by dividing the rotor core 2, deformation of the rotor core 2 insertion portion on the outer peripheral surface of the rotating shaft 7 is suppressed, so that the rotor core 2 is securely held. can do.

  Further, according to the manufacturing method of the above embodiment, the magnetic force generating jig 20 in which the same number of magnetic poles as the rotor core 2 are arranged at equal intervals in the circumferential direction after the rotor core 2 is temporarily assembled to the rotary shaft 7 is connected to the rotary shaft 7. A predetermined air gap is provided coaxially on the outer peripheral side of the rotor core 2 and fixed. At this time, a magnetic force acts between the magnetic poles of the permanent magnet 3 in the rotor core 2 fitted in the outer peripheral surface of the rotating shaft 7 and the magnetic poles of the permanent magnet 21 in the magnetic force generating jig 20. On the other hand, the rotor core 2 moves in the radial direction.

  Thereby, when the repulsive force by the same magnetic pole acts between the magnetic force generating jig 20 and the rotor core 2, the rotor core 2 moves in the radial direction, and the outer peripheral surface of the rotating shaft 7 and the inner peripheral surface of the rotor core 2 are moved. Since the gap is adjusted uniformly, it is possible to assemble the rotating electrical machine rotor 1 while ensuring that the rotating shaft 7 and the rotor core 2 are concentric.

  As described above, according to the embodiment of the present invention, the magnetic force generating jig on which the magnetic poles are arranged is provided on the outer periphery of the rotor core so as to be coaxial with the rotating shaft, so that the rotating shaft and the rotor core are concentrically secured. A rotating electrical machine rotor manufacturing jig and a rotating electrical machine rotor manufacturing method can be provided.

  As mentioned above, although embodiment which concerns on this invention was described, this invention can also be implemented with another form.

  In the above embodiment, the present invention is applied to the case where centering is performed using the rotor core 2 in which the permanent magnet 3 after being magnetized is embedded. However, the present invention is not limited to this, and a part thereof is magnetized. You may make it center using the rotor core 2 with which the permanent magnet 3 of the temporary magnetization state was embedded.

  In the above-described embodiment, the case where the rotating shaft 7 and the rotor core 2 are centered using the repulsive force generated between the magnetic pole of the rotor core 2 and the magnetic pole of the magnetic force generating jig 20 has been described. Centering may be performed by adjusting the radial position of the rotor core 2 by causing the different polarities (N pole and S pole) to face each other to generate a suction force.

  In the above embodiment, the magnetic pole of the magnetic force generating jig 20 is formed by the permanent magnet 3, but the present invention is not limited thereto, and the magnetic pole may be formed by using an electromagnet in which a coil is wound around an iron core. When a coil (electromagnet) is used, the rotor core 2 and the rotating electrical machine rotor 1 can be easily attached and detached by electrically turning off the magnetic force.

  Moreover, in the said embodiment, although the permanent magnet 3 was embed | buried in the magnetic force generation jig | tool 20, not only this but the permanent magnet 3 of a segment magnet should be arrange | positioned on the internal peripheral surface of the magnetic force generation jig | tool 20. May be. Further, as the permanent magnet 3, a ring magnet may be used instead of the segment magnet.

  In the above embodiment, the present invention is applied when the rotor core 2 is assembled to the rotating shaft 7. However, the present invention is not limited to this, and other phase members that are fixed in phase with the rotor 1 for rotating electrical machines (the rotating shaft 7). You may apply when attaching (for example, a resolver rotor etc.).

  In the above embodiment, the present invention is applied to the rotor core 2 in which the divided cores 2a, 2b, and 2c divided in three stages in the axial direction are arranged on the same axis. You may apply to the rotor core 2. FIG. Further, the rotor core 2 may be divided into any number of stages (for example, two stages, four stages, etc.).

  In the above-described embodiment, the present invention is applied to a method for manufacturing an IPM motor including a rotor for a rotary electric machine having a so-called embedded magnet type rotor in which a permanent magnet 3 is embedded and fixed in a rotor core 2 as a rotor 1 for a rotary electric machine. Alternatively, the present invention may be applied to an SPM (synchronous) motor including a so-called surface magnet type rotor for a rotating electrical machine in which the permanent magnet 3 is fixed to the surface of the rotor core 2.

  In the above embodiment, the present invention is applied to a method of manufacturing a rotating electrical machine such as an inner rotor type electric motor in which the rotor 1 for the rotating electrical machine is disposed on the radially inner side of the stator. You may apply to the manufacturing method of the outer rotor type rotary electric machine by which the rotor for rotary electric machines is arrange | positioned.

  In the above embodiment, the present invention is embodied in a rotating electrical machine such as an electric motor used as a drive source of an electric power steering device or an electric drive device. However, the present invention is not limited thereto, and may be used as a drive source of other devices. It may also be used as a generator.

1: rotor for rotating electrical machine, 2: rotor core, 2a, 2b, 2c: split core,
3: permanent magnet for rotor core, 4: rotor plate, 5: slot, 6: insertion hole,
7: Rotating shaft, 8: Key groove, 9: Key, 10: Bolt, 11: Bolt hole, 12: Flange, 13a, 13b: Side plate, 14: Female screw, 20: Magnetic force generating jig, 21: Permanent for jig magnet,
22: Support stand

Claims (3)

A rotating shaft of the rotating electrical machine,
A permanent magnet is housed in a plurality of slots formed in the axial direction and formed by a plurality of laminated ferromagnetic plates, and a key formed to project radially inward on the inner peripheral surface is an outer peripheral surface of the rotating shaft Manufacturing a rotor for a rotating electrical machine comprising: a rotor core that is fitted into a key groove formed inwardly in a radial direction and restricts a phase, and is fitted to a gap of the rotary shaft and fixed integrally. In the jig,
A magnetic force generating jig is provided that is formed in a cylindrical shape, is disposed on the outer peripheral side of the rotor core, and is coaxially fixed to the rotation shaft, thereby centering the rotation shaft and the rotor core. A manufacturing jig for a rotor for a rotating electrical machine. In the manufacturing jig of the rotor for rotary electric machines according to claim 1,
The rotor for manufacturing a rotating electrical machine, wherein the magnetic force generating jig is disposed so that the same magnetic pole as the magnetic pole of the rotor core faces. A rotating shaft of the rotating electrical machine,
A rotor core formed of a plurality of laminated ferromagnetic plates, in which a permanent magnet is housed in a plurality of slots formed in the axial direction, and is fixed to the rotary shaft with a gap therebetween. In the method of manufacturing a rotor for a rotating electrical machine,
A key formed by projecting radially inwardly on the inner peripheral surface of the rotor core is fitted into a key groove formed in a radially inwardly concave shape on the outer peripheral surface of the rotating shaft, thereby regulating the phase. A rotor core temporarily assembling step for temporarily assembling the rotating shaft;
A cylindrical magnetic force generating jig is fixed coaxially with the rotating shaft so that the same magnetic pole as the magnetic pole of the rotor core faces the outer periphery of the rotor core, and the magnetic pole of the rotor core and the magnetic pole of the magnetic force generating jig are A rotor core centering step in which the rotor core and the magnetic force generating jig are repelled and centered by a magnetic force generated therebetween;
And a rotor assembling step for fixing the rotor core and the rotating shaft.

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