JP6207929B2 - Permanent magnet rotating electric machine and elevator apparatus using the same - Google Patents

Description

  The present invention relates to a permanent magnet rotating electric machine and an elevator apparatus using the same.

  In a multi-pole permanent magnet rotary electric machine having a spoke-structured rotor, the rotor core is divided in order to reduce the leakage magnetic flux inside the rotor and improve the material yield. Therefore, it is necessary to fix the divided rotor core by some method. As one method of fixing the rotor core, there is a method in which a nonmagnetic material is disposed on the inner peripheral side of the rotor core, and the rotor core is fitted and fixed to the outer peripheral portion of the nonmagnetic material. As a technique for fitting and fixing the rotor core to the outer peripheral portion of the nonmagnetic material, a technique such as Patent Document 1 is disclosed. Moreover, in patent document 1, a hole is formed in the outer peripheral part vicinity of a rotor core, the bar inserted in the hole is connected with the plate arrange | positioned at the both ends of the rotating shaft direction, and a plate and a shaft are connected to radial direction. And the technique which fixes a rotor core is disclosed.

JP 2013-34344 A

  When the rotor core is fitted to the outer peripheral portion of the nonmagnetic material, electromagnetic stress acts on the outer peripheral portion of each rotor core in the rotational circumferential direction when torque is generated. A bending moment acts on the fitting portion between the rotor core and the nonmagnetic material. In particular, in large-diameter, multi-pole permanent magnet rotating electrical machines in which the rotor core is elongated in the radial direction, the bending moment arm is long and the electromagnetic stress is large, so there is a problem of plastic deformation or buckling of the mating part. It becomes. Therefore, it is important to secure the strength of the fitting portion in a permanent magnet rotating electrical machine having a large diameter and multiple poles.

  In the technique of Patent Document 1, torque acting on the outer peripheral side of the rotor core is transmitted to the shaft via the bar in the hole near the outer peripheral portion of the rotor core and the plates at both ends in the axial direction. A large bending moment does not act on the fitting portion. However, the bar needs to have a sufficient strength to withstand the transmission of torque, and thus the bar width needs to be increased. As a result, the hole in the bar hinders the flow of magnetic flux in the rotor and reduces the torque. Further, in a large-diameter, multi-pole permanent magnet rotating electric machine, it is difficult to secure a width of a bar that can withstand torque transmission because the rotor core cannot be made large in the circumferential direction.

  From the above, the technique of Patent Document 1 has room for improvement in terms of achieving both the fixing of the rotor core and the performance of the permanent magnet rotating electric machine. An object of the present invention is to provide a permanent magnet rotating electrical machine that ensures the strength of a fitting portion between a rotor core and a nonmagnetic material without significantly reducing the performance of the permanent magnet rotating electrical machine.

  The features of the present invention for solving the above problems are as follows, for example.

  A stator, a rotor opposed to the stator in the radial direction via an air gap, and a first nonmagnetic material disposed on the inner peripheral side of the rotor; A plurality of rotor cores and a plurality of permanent magnets, wherein a plurality of rotor cores and a plurality of permanent magnets are alternately arranged radially in the circumferential direction of the rotor, and a plurality of rotors The iron core is fitted to the first nonmagnetic material at the outer periphery of the first nonmagnetic material, and the rotor iron core has an iron core hole penetrating the rotor iron core in the rotation axis direction. Has a non-magnetic material hole penetrating the first non-magnetic material in the rotation axis direction, and two second non-magnetic materials are provided on both sides of the rotor in the rotation axis direction. The non-magnetic material is a permanent magnet rotating electrical machine connected through an iron core hole and a non-magnetic material hole.

  According to the present invention, there is provided a permanent magnet rotating electrical machine that secures the strength of a fitting portion between a rotor core and a nonmagnetic material without significantly reducing the performance of the permanent magnet rotating electrical machine, and an elevator apparatus using the permanent magnet rotating electrical machine. Can do. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

Sectional drawing of the rotating shaft direction which shows the structure of the stator and rotor in 1st Embodiment of this invention. The principal part enlarged view of FIG. Sectional drawing of the radial direction of the permanent magnet rotary electric machine in 1st Embodiment of this invention. The figure which shows the definition of the variable used by calculation of the influence which the core hole of a rotor core has on torque performance. The figure which shows the calculation result of FIG. Sectional drawing of the rotating shaft direction which shows the structure of the stator and rotor in 2nd Embodiment of this invention. Sectional drawing of the radial direction of the permanent magnet rotary electric machine in 2nd Embodiment of this invention. Sectional drawing of the rotating shaft direction which shows the structure of the 1st modification of the 2nd nonmagnetic material in 3rd Embodiment of this invention. Sectional drawing of the rotating shaft direction which shows the structure of the 2nd modification of the 2nd nonmagnetic material in 3rd Embodiment of this invention. Sectional drawing of the rotating shaft direction which shows the structure of the 3rd modification of the 2nd nonmagnetic material in 3rd Embodiment of this invention. The radial direction sectional view showing the composition of the elevator device provided with the permanent magnet rotating electrical machine of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

  First, the structure of the permanent magnet rotating electrical machine according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view in the direction of the rotation axis showing the configuration of the stator and the rotor in the first embodiment of the present invention. FIG. 2 is an enlarged view of a main part of a 1/6 region in the circumferential direction of FIG. FIG. 3 is a radial sectional view of the permanent magnet rotating electric machine according to the first embodiment of the present invention. FIG. 4 is a diagram showing definitions of variables used in calculation of the influence of the core hole of the rotor core of the present invention on the torque performance. FIG. 5 is a diagram illustrating the calculation result of FIG.

  In FIG. 1, a permanent magnet rotating electrical machine 1 includes a stator 2, a rotor 3, and a second nonmagnetic material 100.

  In FIG. 2, the stator 2 includes a stator core 21 and a stator winding 22. The stator core 21 is configured by laminating electromagnetic steel plates punched by a punching die or the like in the rotation axis direction. The stator core 21 is provided on the outer peripheral portion of the stator 2 and constitutes a stator core back 23 that constitutes the magnetic path of the stator 2. The stator core 21 is radially predetermined from the stator core back 23 toward the inner periphery of the stator 2. The stator salient poles 24 extend at an angular pitch. As shown in FIG. 2, a space constituted by a pair of adjacent stator salient poles 24 and the stator core back 23 is a slot 25, and is a space for accommodating the stator winding 22. Here, it is assumed that one stator winding 22 is wound around each stator salient pole 24.

  On the other hand, the rotor 3 is disposed to face the stator 2 via the air gap 4 in the radial direction. A shaft 35 is connected to the rotor 3. A first nonmagnetic material 36 is disposed on the inner peripheral side of the rotor 3 on the outer peripheral surface of the shaft 35. The rotor 3 is provided on the outer peripheral surface of the first non-magnetic material 36, and includes a rotor core 31 that is divided into a plurality in the rotation circumferential direction and a permanent magnet 34 that is divided into a plurality in the rotation circumferential direction. Is done. The permanent magnets 34 and the rotor cores 31 are alternately arranged radially in the rotation circumferential direction toward the outer periphery of the rotor 3. The rotor core 31 is configured by, for example, laminating electromagnetic steel plates punched by a punching die or the like in the rotation axis direction. As shown in the figure, the rotor core 31 is divided into poles in the rotation circumferential direction, and is arranged side by side at a predetermined angular pitch along the rotation circumferential direction of the rotor 3. The rotor core 31 functions as a rotor magnetic pole 32 that constitutes the magnetic path of the rotor 3.

  As shown in the figure, a permanent magnet 34 is accommodated in a space formed by a pair of adjacent rotor magnetic poles 32 and a first nonmagnetic material 36, that is, a magnet insertion space 33. At this time, the magnetization of the permanent magnet 34 is oriented in a direction perpendicular to the radial direction of the rotor 3, and the rotor magnetic poles 32 are arranged so as to alternate with NSNS... Along the rotation circumferential direction of the rotor 3. Is done. The permanent magnet 34 is fixed to the magnet insertion space 33 with an adhesive or the like.

  The rotor core 31 is fitted to the first nonmagnetic material 36 at the outer periphery of the first nonmagnetic material 36. The first nonmagnetic material 36 is fixed by a keyway (not shown) on the outer peripheral surface of the shaft 35. The first nonmagnetic material 36 has an effect of reducing the leakage magnetic flux on the inner peripheral side of the rotor magnetic pole 32. Torque acting on the rotor core 31 is transmitted to the shaft 35 via the first nonmagnetic material 36. The rotor core 31 has an iron core hole 37 that penetrates the rotor core 31 in the direction of the rotation axis of the rotor 3, and the first nonmagnetic material 36 is a first nonmagnetic material in the direction of the rotation axis of the rotor 3. A non-magnetic material hole 38 that penetrates the material 36 is provided. In this embodiment, the torque acting on the outer peripheral side of the rotor core 31 is the rotor core 31 → the fitting portion between the rotor core 31 and the first nonmagnetic material 36 → the first nonmagnetic material 36 → the shaft. It transmits in order of 35. In the case of the present embodiment, the main transmission path of torque is not a bar, so that the bar need not be made larger than the conventional one.

  In FIG. 3, the stator 2 is fixed to the frame 5 via the stator core back 23 in the rotation axis direction, and the shaft 35 connected to the rotor 3 is attached to the frame 5 via the bearing 6. The rotor 3 is connected to an encoder 7 for controlling the permanent magnet rotating electrical machine 1 in the direction of the rotation axis. The shaft 35 is connected to the rotor 3. The side plate 39 is connected to the shaft 35. Side plates are arranged on one side of the two second nonmagnetic materials 100 in the rotation axis direction.

  Two second nonmagnetic materials 100 are provided on both sides of the rotor 3 in the direction of the rotation axis, and the two second nonmagnetic materials 100 pass through the core hole 37 and the nonmagnetic material hole 38 in the direction of the rotation axis. It is connected.

  As described above, by rotating the outer peripheral side of the rotor core 31 with the second nonmagnetic material 100, the rotation generated by the rotational circumferential component of the electromagnetic stress acting on the outer peripheral surface of the rotor core 31. The bending moment of the fitting portion between the core 31 and the first nonmagnetic material 36 can be weakened, and the strength of the fitting portion between the rotor core 31 and the first nonmagnetic material 36 can be secured. Moreover, since it has the function which also suppresses the electromagnetic vibration of the rotor core 31, it leads to a noise reduction. Further, when a ferrite magnet is used for the rotor core 31, the ferrite core can be prevented from being chipped by suppressing the vibration of the rotor core 31, and the magnetic powder of the magnet can be prevented from jumping into the air gap 4.

  When the rotor core 31 and the first nonmagnetic material 36 have a small depth in the radial direction and the tip shape on the inner peripheral side of the rotor core 31 is pointed, the rotor 3 rotates when the rotor 3 is manufactured. Positioning of the core 31 is difficult, the outer diameter roundness of the rotor 3 is deteriorated, and it is difficult to realize low torque pulsation. Therefore, as in the present embodiment, the rotor core 31 and the first nonmagnetic material 36 are fitted with a dovetail structure so that the rotor core 31 can be easily positioned and the rotor 3 can be positioned outside the rotor 3. Since the circularity can be improved, low torque pulsation can be realized.

  4 and 5 show the influence of the core hole 37 of the rotor core 31 on the torque performance. As shown in the drawing, on the axis of symmetry of the rotor core 31 in the radial direction, the distance between two lines connecting the outer peripheral side and inner peripheral corners of a pair of adjacent permanent magnets 34 is a, the permanent magnet The distance from the inner circumferential side line of 34 to the center point of the core hole 37 is b. The change in torque when a was constant and b was changed was calculated by magnetic field analysis using the side element finite element method.

  In this embodiment, since the generated torque is assumed to be several thousand Nm class, the corresponding electromagnetic stress is assumed, and the size of the iron core hole 37 is set to be equivalent to M6 and M8 bolts. In FIG. 5, the torque reduction rate when the iron core hole 37 corresponding to M6 bolt is opened is shown by a solid line, and the torque reduction rate when the iron core hole 37 equivalent to M8 bolt is made is shown by a dotted line. From the results in the figure, it can be seen that the torque decreases as the position of the core hole 37 is on the outer peripheral side, and the reduction rate increases as the core hole 37 increases. Here, assuming that the torque reduction rate can be tolerated up to 3%, the position of the core hole 37 corresponding to M6 bolt is up to about 95% (expressed by a value of b / a × 100), and the core hole 37 corresponding to M8 bolt. The position of can be arranged up to about 75%. If the position of the core hole 37 is less than 50%, the effect of weakening the bending moment of the fitting portion between the rotor core 31 and the first nonmagnetic material 36 is reduced, so the position of the core hole 37 is 50% or more. It is desirable that it is 95% or less, preferably 70% or more and 95% or less, more preferably 90% or more and 95% or less. Further, in the range of the position of the core hole 37, at the position 95% of the core hole 37 that has the greatest effect of weakening the bending moment of the fitting portion between the rotor core 31 and the first nonmagnetic material 36, it corresponds to M6 bolt. Since the width in the rotational circumferential direction of the core hole 37 is about 30% of the width in the rotational circumferential direction of the rotor core 31 passing through the center of the core hole 37, the rotational circumferential width of the core hole 37 is the core of the core hole 37. It is desirable that the width of the rotor core 31 passing through the center of the hole 37 is 35% or less, preferably 28% or more and 32% or less of the circumferential width.

  When it is difficult to make a keyway on the outer peripheral surface of the shaft 35, two second nonmagnetic materials 100 are connected to the side plate 39 connected to the shaft 35 through the nonmagnetic material holes, and torque is transmitted via the side plate 39. It may be transmitted to the shaft 35. As a result, it is possible to ensure the strength of the fitting portion between the rotor core 31 and the first nonmagnetic material 36 and transmit torque to the shaft 35 at the same time.

  The structure of the permanent magnet rotating electric machine according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a cross-sectional view in the direction of the rotation axis showing the configuration of the stator and the rotor in the present embodiment. FIG. 7 is a cross-sectional view in the radial direction of the permanent magnet rotating electric machine according to the present embodiment.

  In FIG. 6 and FIG. 7, two second nonmagnetic materials 100 are connected in the direction of the rotation axis through the core hole 37 of the rotor core 31 by pins 110, and nonmagnetic of the first nonmagnetic material 36 by bolts 120. It is connected to the rotation axis direction through the material hole 38 and connected to the side plate 39.

  In the multi-pole permanent magnet rotating electric machine as in this embodiment, since it has a large number of rotor cores 31, the number of iron core holes 37 increases, and if all of them are connected by bolts 120, the production lead time is greatly increased. There is a problem of increasing. On the other hand, by using the pin 110, a plurality of connecting operations can be performed simultaneously, so that the production lead time can be shortened. The shape of the pin 110 is not limited to the round shape in the figure, but may be a polygonal shape. However, in the case of a rectangle, the two second non-magnetic members 100 can be connected without hindering the flow of magnetic flux as much as possible by arranging the direction of the long side toward the radial direction.

  On the other hand, since the number of nonmagnetic material holes 38 in the first nonmagnetic material 36 is smaller than the number of iron core holes 37, the production lead time does not increase significantly even if the bolt 120 is used. Therefore, it is possible to simultaneously hold the rotor core 31 and transmit torque by using the bolt 120 in the nonmagnetic material hole 38 of the first nonmagnetic material 36. Further, in order to transmit torque from the second nonmagnetic material 100 to the side plate 39, it is necessary to secure the fastening force in the rotation axis direction of the first nonmagnetic material 36, the second nonmagnetic material 100, and the side plate 39. Therefore, the use of the bolt 120 rather than the pin 110 can secure the fastening force in the direction of the rotation axis, and stable torque transmission is possible.

  In the present embodiment, the example in which the pin 110 and the bolt 120 are used for the iron core hole 37 and the nonmagnetic material hole 38 over the entire circumference in the rotation circumferential direction is shown, but it is not always necessary to use all of them. In the case where there is a margin in the strength of the fitting portion between the rotor core 31 and the first nonmagnetic material 36, for example, a method of using one pin 110 and bolt 120 by skipping one piece in the rotational circumferential direction may be employed. .

  A permanent magnet rotating electric machine according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a cross-sectional view in the direction of the rotation axis showing the configuration of the first modification of the second nonmagnetic material in the third embodiment of the present invention. FIG. 9 is a cross-sectional view in the rotation axis direction showing the configuration of the second modification of the second nonmagnetic material in the third embodiment of the present invention. FIG. 10 is a cross-sectional view in the direction of the rotation axis showing the configuration of the third modification of the second nonmagnetic material in the third embodiment of the present invention.

  In FIG. 8, two second nonmagnetic materials 100 are divided in the circumferential direction of rotation, and each of the divided second nonmagnetic materials 100 has a nonmagnetic material hole of the first nonmagnetic material 36. There are two parts connected through 38.

  Dividing the second nonmagnetic material 100 in the rotational circumferential direction leads to an improvement in material yield. Further, in the divided second nonmagnetic material 100, the inner periphery of the second nonmagnetic material 100 is formed by providing two or more portions to be connected through the nonmagnetic material holes 38 of the first nonmagnetic material 36. Electromagnetic vibration generated on the side can be reduced, leading to lower noise.

  As a further measure for improving the material yield of the second nonmagnetic material 100, there are configurations shown in FIGS. In FIG. 9, the divided second nonmagnetic material 100 includes a second nonmagnetic material 300 having a shape covering the core hole 37 and the nonmagnetic material hole 38 in the rotation axis direction, and an iron core hole in the rotation axis direction. There are two types of second non-magnetic material 310 that covers 37 and exposes the non-magnetic material hole 38. In other words, the second nonmagnetic material 310 has a shape that covers only the vicinity of the core hole 37. Two types of second first nonmagnetic material 300 and second second nonmagnetic material 310 are alternately arranged in the circumferential direction of rotation, and the second first nonmagnetic material 300 is connected through the core hole 37 and the nonmagnetic material hole 38. The second nonmagnetic material 310 is connected only through the core hole 37.

  In FIG. 10, the second non-magnetic material 310 has a greater number of configurations than the second non-magnetic material 300. Thereby, the usage-amount of the 2nd nonmagnetic material 100 can be reduced.

  Since a force acts on the second nonmagnetic material 310 in the rotational circumferential direction, the second first nonmagnetic material 300 passes through the second nonmagnetic material 310 adjacent to the rotational circumferential direction. By transmitting the force up to the above, the strength of the fitting portion between the rotor core 31 connected to the second nonmagnetic material 310 and the first nonmagnetic material 36 can be ensured.

  9 and 10, the vibration of the rotor 3 becomes a problem due to the unbalanced weight of the rotor 3. Therefore, the unbalanced weights of the rotor 3 are dispersed by connecting one side of the two second nonmagnetic materials 100 while being shifted in the rotational circumferential direction by a certain angle, and vibration of the rotor 3 can be prevented. In the case of FIG. 9, only one side of the two second nonmagnetic materials 100 may be shifted in the rotational circumferential direction by 60 degrees and connected. In the case of FIG. 10, only one side of the two second nonmagnetic materials 100 may be shifted by 90 degrees in the rotational circumferential direction.

  The structure of the elevator apparatus provided with the permanent magnet rotating electric machine in one embodiment of the present invention will be described with reference to FIG. FIG. 11 is a radial cross-sectional view showing a configuration of an elevator apparatus including a permanent magnet rotating electric machine according to an embodiment of the present invention.

  In FIG. 11, the elevator apparatus 400 includes a permanent magnet rotating electrical machine 1, a rotating body 201, a brake 202, a brake drum 203, and a sheave 204. In FIG. 11, the stator 2 is fixed to the frame 5 with bolts 121 via the stator core back 23 in the rotation axis direction, and the shaft 35 connected to the rotor 3 is attached to the frame 5 via the bearing 6. . The rotor 3 is connected to an encoder 7 for controlling the permanent magnet rotating electrical machine 1 in the direction of the rotation axis. The rotating body 201 includes a brake drum 203 for receiving a shoe of a brake 202 disposed on the outer peripheral side, and a sheave 204 for transmitting a force to the rope. The frame 5 is fixed to the machine base in the hoistway or the machine base of the machine room on the top floor of the building.

  In the elevator apparatus that can secure the strength of the fitting portion between the rotor core 31 and the first nonmagnetic material 36 by using the permanent magnet rotating electric machine 1 in one embodiment of the present invention, and generates a large torque, A highly reliable elevator apparatus 400 can be provided. Moreover, the elevator apparatus 400 with low vibration and low noise can be provided. Furthermore, in the permanent magnet rotating electrical machine 1 according to one embodiment of the present invention, the performance equivalent to that of a neodymium magnet can be obtained even when a ferrite magnet is used, and therefore, an elevator apparatus 400 that is not easily affected by resource security can be provided.

  In the above, an elevator apparatus equipped with the permanent magnet rotating electric machine of the present invention has been shown. However, the present invention can be applied to a permanent magnet rotating electric machine for servo and electric power steering that require high torque and low torque pulsation. It is.

1: Permanent magnet rotating electric machine 2: Stator 3: Rotor 4: Air gap 5: Frame 6: Bearing 7: Encoder 21: Stator core 22: Stator winding 23: Stator core back 24: Stator salient pole 25: Slot 31: Rotor core 32: Rotor magnetic pole 33: Magnet insertion space 34: Permanent magnet 35: Shaft 36: First nonmagnetic material 37: Iron core hole 38: Nonmagnetic material hole 39: Side plate 100: Second Nonmagnetic material 110: Pin 120, 121: Bolt 201: Rotating body 202: Brake 203: Brake drum 204: Sheave 300: Second nonmagnetic material 310: Second nonmagnetic material 400: Elevator device

Claims (11)

A stator,
A rotor facing the stator in the radial direction through an air gap;
A first non-magnetic material disposed on the inner peripheral side of the rotor,
The rotor has a rotor core divided into a plurality of parts in the circumferential direction of rotation and a permanent magnet divided into a plurality of parts.
The plurality of rotor cores and the plurality of permanent magnets are alternately arranged radially in the rotation circumferential direction of the rotor,
The plurality of rotor cores are fitted to the first nonmagnetic material at the outer periphery of the first nonmagnetic material,
The rotor core has an iron core hole penetrating the rotor core in the rotation axis direction;
The first non-magnetic material has a non-magnetic material hole penetrating the first non-magnetic material in the rotation axis direction,
Two second nonmagnetic materials are provided on both sides of the rotor in the rotation axis direction,
The two second nonmagnetic materials are connected through the iron core hole and the nonmagnetic material hole ,
A shaft coupled to the rotor;
A side plate connected to the shaft,
The side plate is arranged on one side of the rotation axis direction of the two second nonmagnetic materials,
The permanent magnet rotating electrical machine in which the two second nonmagnetic materials are connected to the side plate in the rotation axis direction through the nonmagnetic material holes . In claim 1,
A permanent magnet rotating electrical machine in which the rotor core is fitted to the outer peripheral portion of the first nonmagnetic material by a dovetail. In claim 1 or 2,
A permanent magnet rotating electrical machine in which a width in a rotation circumferential direction of the iron core hole is 35% or less of a rotation circumferential direction width of the rotor core passing through a center of the iron core hole. In any one of Claims 1 thru | or 3,
On the axis of symmetry of the rotor core in the radial direction,
The distance between two lines connecting the outer peripheral side and inner peripheral side corners of a pair of adjacent permanent magnets is a,
When the distance from the inner peripheral side line of the permanent magnet to the center point of the core hole is b,
A permanent magnet rotating electrical machine in which b / a is 50% or more and 95% or less. In any one of Claims 1 thru | or 4,
The two second non-magnetic materials are connected in a rotation axis direction through the iron core hole by a pin,
The permanent magnet rotating electric machine in which the two second nonmagnetic materials are connected to the side plate in the rotation axis direction through the nonmagnetic material holes by bolts . In any one of Claims 1 thru | or 5,
A permanent magnet rotating electrical machine in which the two second nonmagnetic materials are divided in the rotational circumferential direction . In claim 6 ,
A permanent magnet rotating electrical machine in which the two divided second nonmagnetic materials have two or more portions connected through the nonmagnetic material holes . In claim 6 or 7 ,
The two divided second nonmagnetic materials include a first nonmagnetic material having a shape covering the core hole and the nonmagnetic material hole in the rotation axis direction, and the iron core hole in the rotation axis direction. ,Previous
There is a second nonmagnetic material having a shape that exposes the nonmagnetic material hole,
The second non-magnetic material is connected through the iron core hole and the non-magnetic material hole,
The second non-magnetic material is a permanent magnet rotating electrical machine connected through the iron core hole . In claim 8 ,
The permanent magnet rotating electrical machine in which the second non-magnetic material is more than the second non-magnetic material . In claim 8 or 9 ,
A permanent magnet rotating electrical machine in which one of the two second nonmagnetic materials is displaced in the rotational circumferential direction and the two second nonmagnetic materials are connected . The elevator apparatus provided with the permanent magnet rotary electric machine in any one of Claims 1 thru | or 10.