JP2014050274A - Rotor for surface magnet affixed rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor for a surface magnet affixed rotary electric machine in which reliability can be ensured sufficiently by stably fixing a plate permanent magnet in an outer circumference of a primary part of the rotor for a long period of time.SOLUTION: In a rotor for a surface magnet affixed rotary electric machine, a primary part of the rotor which is formed cylindrical and fixed to a rotary shaft, and a plurality of plate permanent magnets are provided in a rotor block for each block. On a cylindrical surface of the primary part of the rotor, the plurality of plate permanent magnets are provided as many as poles in a shaft circumferential direction of the rotary shaft, and rear sides of the plurality of plate permanent magnets are affixed to the cylindrical surface of the primary part of the rotor. A multi-step skew type rotor body is provided which is configured by fixing a plurality of rotor blocks to the rotary shaft in the state where arrangement centers of the plate permanent magnets are formed while being deviated step by step for each block in the shaft circumferential direction of the rotary shaft. A non-magnetic annular pressing plate is provided which includes a surface pressing part mounted while facing the plurality of rotor blocks from both sides in an axial direction of the rotary shaft, respectively, and pressing surfaces of the plurality of plate permanent magnets in a shaft central direction of the rotary shaft.

Description

  Embodiments described herein relate generally to a rotor of a surface magnet-attached rotary electric machine.

  For example, conventionally, an IPM (Interior Permanent Magnet) system is mainly used for a rotating electrical machine used for an elevator hoist. This IPM type rotating electrical machine is called an internal magnet embedded type rotating electrical machine, and is a rotating electrical machine in which a permanent magnet is embedded in a rotor (rotor). However, it is desired to reduce the amount of permanent magnets used under the influence of the recent rise in rare earth elements. Therefore, it has been studied to adopt an SPM (Surface Permanent Magnet) method. The SPM type rotating electrical machine is referred to as a surface magnet-attached rotating electrical machine, and indicates a rotating electrical machine in which a permanent magnet is attached to the surface of a rotor.

  For example, in the event of an emergency such as a power failure, the stator winding of the elevator hoisting machine is short-circuited to generate a braking force according to the rotation of the rotor and operate the dynamic brake. As compared with the IPM system, the permanent magnets disposed on the rotor have the advantage that the SPM system is disposed closer to the inner end of the stator, so that the dynamic brake torque is more easily generated.

  Conventionally, in the SPM system, a permanent magnet along the outer shape of the rotor is required. For example, a technique using a permanent magnet molded into an arc shape, a so-called kamaboko shape has been provided (see, for example, Patent Document 1). In this case, it is preferable to use a flat plate permanent magnet because the mold becomes complicated and the amount of magnet powder to be used increases as compared with the flat plate magnet used in the IPM system.

  In a rotating machine with a permanent magnet attachment type, the rotor is manufactured by attaching a permanent magnet to the outer peripheral surface of the main part of the rotor. However, if the attractive force cannot be guaranteed due to centrifugal force during high-speed rotation, deterioration of the adhesive, etc., there is a possibility that a part of the permanent magnet will be detached.

  In order to solve such technical problems, various methods for stably fixing the permanent magnet to the peripheral surface of the rotor core have been proposed. For example, a technique for winding a prepreg tape and a heat-shrinkable tube around the outer periphery is provided. A technique for bonding a flat magnet into a groove is also provided. However, when a method of covering with a prepreg tape or a heat shrinkable tube is employed, there is a problem in that sufficient reliability cannot be secured with the passage of years.

JP 2002-78257 A JP 2012-125076 A

  Provided is a rotor for a surface magnet-attached type rotating electrical machine in which a flat permanent magnet can be stably fixed to the outer periphery of a rotor main part for a long period of time so that sufficient reliability can be secured.

  The rotor of the surface magnet-attached rotary electric machine according to one embodiment includes a rotor main portion formed in a cylindrical shape and fixed to a rotation shaft, and the number of poles in the axial direction of the rotation shaft on the cylindrical surface of the rotor main portion. The rotor block for each block is provided with a plurality of flat plate permanent magnets that are provided separately and whose back surface is attached to the cylinder surface of the main part of the rotor. In addition, a multi-stage skew type rotation in which a plurality of rotor blocks are fixed to the rotation shaft in a state where the arrangement center of the plate permanent magnet is shifted stepwise in the axial direction of the rotation shaft for each block. A child body is provided. In addition, a plurality of rotor blocks are mounted facing each other from both sides in the axial direction of the rotating shaft, and a non-magnetic annular shape having a surface pressing portion that presses the surface of the plurality of flat plate permanent magnets in the axial center direction of the rotating shaft. A presser plate is provided.

The perspective view which shows the structure of the rotor about 1st Embodiment Sectional drawing which shows schematically the structure of the hoist for elevators about 1st Embodiment The perspective view which shows the whole rotor main body structure about 1st Embodiment. The perspective view which shows one rotor block about 1st Embodiment The perspective view which shows the press plate for 1 block about 1st Embodiment The expanded perspective view which shows the principal part of a press plate about 1st Embodiment The perspective view which shows one manufacturing step of the rotor about 1st Embodiment (the 1) The perspective view which shows one manufacturing step of the rotor about 1st Embodiment (the 2) About 2nd Embodiment, (a) Axial direction sectional view (the 1) which shows the principal part structure of one rotor block, (b) The perspective view which shows typically the structure of a permanent magnet Sectional view in the axial radial direction showing the main structure of one rotor block in the third embodiment (No. 2) The perspective view which shows the principal part structure of one rotor block about 3rd Embodiment (the 1) Regarding the fourth embodiment, (a) axial radial cross-sectional view showing the main structure of one rotor block (part 3), (b) equivalent view of FIG. 9 (b) The perspective view which shows the principal part structure of one rotor block about 5th Embodiment (the 2) FIG. 6 equivalent view showing the fifth embodiment The perspective view which shows the principal part structure of one rotor block about 6th Embodiment (the 3) FIG. 6 equivalent view showing the sixth embodiment

  Hereinafter, a plurality of embodiments applied to an electric motor used for an elevator hoisting machine will be described with reference to the drawings for a rotating electric machine including a surface magnet-attached rotor. Note that the same or similar components are denoted by the same or similar reference numerals among a plurality of embodiments described below, and description of overlapping parts is omitted as necessary, with different parts as the center. explain.

(First embodiment)
1 to 8 show a first embodiment. As shown in FIG. 2, the elevator hoist 1 is used for raising and lowering an elevator car (not shown), and includes an electric motor (rotating electric machine) 2, a hoisting machine load 3, and the like. The electric motor 2 is composed of a permanent magnet type synchronous motor and is inverter-controlled. The electric motor 2 includes a stator 4 and a rotor 5. The stator 4 includes a stator core 6 configured by laminating a large number of steel plates, and a winding 7 wound around the stator core 6.

  The rotor 5 is provided side by side on a rotor core (corresponding to the main part of the rotor) 8 having a large number of steel plates arranged on the inner peripheral side of the stator 4 via gaps, and on the outer peripheral surface of the rotor core 8. It mainly includes a permanent magnet (corresponding to a flat plate permanent magnet) 9 with its back surface attached, and a rotating shaft 10 inserted and fixed in the center hole of the rotor core 8.

  The stator 4 is fitted and fixed to the inner peripheral surface of the cylindrical body 11, and bearing brackets 12 and 13 are disposed at both ends of the body 11. The bearing bracket 13 is located on the hoisting machine load side of the body portion 11, and the bearing bracket 12 is disposed on the opposite side of the bearing bracket 13 across the body portion 11.

  Bearings 14 and 15 are respectively fixed to the bearing brackets 12 and 13, and the rotating shaft 10 of the rotor 5 is supported on these bearings 14 and 15. A bearing is used for each of the bearings 14 and 15. A sheave as the hoisting machine load 3 is connected to the end 10 a of the rotating shaft 10.

  A groove 16 is formed on the outer periphery of the hoisting machine load 3 connected to the load-side end portion 10a of the rotary shaft 10, and a rope 17 for hanging an elevator car is hung on the groove 16. Also, a disc brake 18 that applies braking to the rotor 5 by frictional force is attached to the bearing bracket 12 disposed on the opposite side of the hoisting machine load 3 with the body portion 11 interposed therebetween. Although the internal structure of the disc brake 18 is not shown, when the armature abuts against a disc fixed to the end of the rotating shaft on the side opposite to the load and applies a braking force, and the electromagnet device is energized, the armature is electromagnet device. So that the rotary shaft 10 can be rotated (braking release state).

  The elevator hoisting machine 1 of the present embodiment is for a so-called gearless hoisting machine. For example, the rotational speed is about 300 [rpm], the electric motor 2 has a stator 6 having 36 slots, and the rotor 5 has There are 28 poles.

  Now, FIG. 3 shows a rotor body 19 which is a basic configuration of the rotor 5. The rotary shaft 10 is fixed to the rotor core 8 by press-fitting, fitting, or inserted into the shaft hole 8 a (see FIG. 4) of the rotor core 8. The rotary shaft 10 may be formed with a hollow center portion along the axial direction. The rotor body 19 has a basic structure in which a plurality of blocks of rotor blocks 20 are stacked in the axial direction of the rotary shaft 10.

  FIG. 4 is a perspective view showing one rotor block 20. As described above, the rotor core 8 is provided with the shaft hole 8a. The shaft hole 8 a is formed on the inner peripheral surface of the rotor core 8. The shaft hole 8a includes a shaft groove 8b for restricting the rotor block 20 in the rotation direction when the rotating shaft 10 rotates. The shaft groove 8b is formed along the axial direction of the rotary shaft 10, and fits the outer periphery of the rotary shaft 10. When the shaft groove 8b is engaged with the rotary shaft 10, the rotary shaft 10 is rotated. Sometimes the rotor block 20 also rotates together. In addition, the rotor core 8 has guides 8c formed on the outer peripheral surface thereof at predetermined intervals in the axial circumferential direction, and an installation space for the permanent magnet 9 is secured.

  These guides 8 c are formed along the axial direction of the rotary shaft 10. The distance between the guides 8c is equal to the width of the permanent magnet 9, the number of guides 8c is the same as the number of permanent magnets 9, and the permanent magnets are formed on the outer surface of the rotor core 8 between the guides 8c. 9 is affixed. As a result, the guides 8 c can be provided at the lower side ends of the permanent magnet 9, and the permanent magnet 9 can be regulated to slide in the axial direction of the rotating shaft 10.

  When a magnet that is as powerful as possible is used as the permanent magnet 9, for example, a heat-resistant neodymium magnet having neodymium, iron, boron or the like as a main component and a portion of neodymium replaced with dysprosium is used. Moreover, since this kind of permanent magnet 9 usually sinters magnet powder after compression molding, a mold is required at the time of molding. In the present embodiment, the permanent magnet 9 is three-dimensionally formed on a flat plate, giving priority to the ease of manufacturing the mold.

  The permanent magnet 9 is attracted to the rotor core 8 by magnetic force. For the purpose of increasing the attractive force, for example, there is a method of fixing to the rotor core 8 using an adhesive, but an adhesive may or may not be used. In the present embodiment, the positional deviation of the permanent magnet 9 can be prevented as much as possible by providing the guide 8c. In the present embodiment, 28 permanent magnets 9 are provided on the outer peripheral surface of the rotor core 8 and are arranged so that the magnetic poles of the adjacent permanent magnets 9 are different, thereby constituting 28 poles. The number of permanent magnets 9, that is, the number of magnetic poles is an example, and the present invention is not limited to this. Thus, the rotor block 20 of the SPM type rotating electric machine is configured.

  As shown in FIG. 1, presser plates 21 and 22 are provided opposite to each other in the axial direction of each rotor block 20. These presser plates 21 and 22 are formed of a non-magnetic material using, for example, stainless steel, and serve as a locking tool for preventing the permanent magnet 9 from being detached. Further, end plates 30 are provided at both axial ends of the rotor block 20 for all blocks. The end plate 30 has a hole formed in the center thereof that matches the outer diameter of the rotary shaft 10. The end plate 30 can hold the rotor blocks 20 of all the blocks from both ends in the axial direction by inserting the rotary shaft 10 into the central hole.

  As shown in the exploded perspective view of the rotor block 20 and the press plates 21 and 22 for one block in FIG. 5, each of the press plates 21 and 22 has a hole for inserting the rotary shaft 10 in the center, It has a generally annular shape. These presser plates 21 and 22 are located at the outer peripheral edge, are provided at side presser portions 21a and 22a that oppose the side surfaces of the permanent magnet 9 and press against the radial end of the ring. Surface pressing portions 21b and 22b for pressing the surface.

  When these presser plates 21 and 22 are attached to the rotor block 20, the surface presser portions 21 b and 22 b of the presser plates 21 and 22 are projected toward the center of the surface of each permanent magnet 9 and from both sides in the axial direction. Both ends of the surface of the permanent magnet 9 are covered.

  As shown in a partially enlarged view when the presser plate 21 is mounted in FIG. 6, the surface presser portion 21 b is formed in a flat plate in a region that contacts the surface of each permanent magnet 9, and is near the center between adjacent permanent magnets 9. (See the bent portion 21c), and the surface of the adjacent permanent magnet 9 is formed into a flat plate. The surface pressing portion 21 b is connected over the surface of each permanent magnet 9 provided on the outer peripheral surface of the rotor core 8. That is, in the present embodiment, the presser plates 21 and 22 are formed in a polygonal shape (a 28-gonal shape in the present embodiment) in the cross section of the surface pressing portion 21b.

  The permanent magnet 9 provided in the axial direction of the rotary shaft 10 is pressed by the side surface holding portions 21a and 22a of the press plates 21 and 22 in the axial direction of the rotary shaft 10 and is subjected to centrifugal force. Is pressed by the surface pressing portions 21b, 22b of the pressing plates 21, 22. As described above, the guides 8c are provided at the lower ends on both sides in the axial direction of each permanent magnet 9, so that the surface of the permanent magnet 9, the axial side surface of the rotary shaft 10, and the axial direction of the rotary shaft 10 are thereby obtained. Movement can be restricted to any one of the side surfaces, and each permanent magnet 9 can be fixed.

  As shown in FIG. 1, the rotor block 20 and the pressing plates 21 and 22 are stacked in a plurality of blocks in the axial direction of the rotating shaft 10. In each of the rotor blocks 20, the permanent magnets 9 are arranged on the outer peripheral surface of each of the rotor cores 8 by the number of poles. The relative fixing position is shifted stepwise in the axial direction of the rotating shaft 10. Thereby, a stepped skew is formed.

  A method for manufacturing the rotor 5 will be described. First, as shown in FIG. 7, the rotor core 8 is formed of a steel plate for each block. At this time, the shaft hole 8a is provided in the center of the rotor core 8 together with the shaft groove 8b. Further, guides 8c are provided on the outer peripheral surface of the rotor core 8 by the number of poles, and a space between these guides 8c is formed into a flat surface 8d. Thereby, the guides 8c can be formed on both sides in the circumferential direction of the flat surface 8d. Next, the permanent magnet 9 is stuck between the adjacent guides 8c. Then, the rotor block 20 shown in FIG. 4 can be manufactured.

  Next, as shown in FIG. 5, the presser plates 21 and 22 are fitted to face each other from both sides of the side surface of the rotor block 20. At this time, the axial side surface of the permanent magnet 9 can be pressed by the side surface pressing portions 21 a and 22 a of the pressing plates 21 and 22, and the surface of the permanent magnet 9 can be pressed by the surface pressing portions 21 b and 22 b of the pressing plates 21 and 22.

  Next, after the end plate 30 on one side is inserted into the rotating shaft 10 (not shown), the shaft hole 8a of the rotor core 8 is fitted into the rotating shaft 10 and is displaced in the circumferential direction of the rotating shaft 10. Do not fix. Then, as shown in FIG. 8, the rotor block 20 and the pressing plates 21 and 22 for one block can be fixed to the rotating shaft 10. These steps are repeated for all blocks. Then, the end plate 30 on the other side is inserted through the rotary shaft 10 so as to sandwich the rotor blocks 20 for all blocks.

  Thereby, it is possible to fix all the rotor blocks 20 and the presser plates 21 and 22 so as not to move in the axial direction of the rotary shaft 10. In this way, the rotor 5 is manufactured. In addition, since the other structure (for example, stator 4 etc.) which comprises the elevator hoist 1 is the same as that of a conventional structure, the description is abbreviate | omitted.

  In the elevator hoisting machine 1 including the stator 4 and the rotor 5, a driving signal is supplied to a winding 7 of each phase from a driving circuit (not shown). Then, a rotational force acts on the rotor 5 so that the rotor 5 rotates together with the rotary shaft 10, and power is transmitted to the hoisting machine load 3 (sheave) connected to the rotary shaft 10. Then, the elevator car can be moved up and down by operating the rope 17. At this time, as shown in FIG. 2, the stator 4 and the permanent magnet 9 of the rotor 5 can be brought close to each other. For example, in an emergency such as a power failure, a dynamic brake torque is likely to be generated greatly. .

  According to the present embodiment, since the presser plates 21 and 22 are provided on the rotor block 20, even if centrifugal force is applied to the rotor 5, the permanent magnet 9 can be prevented from being detached. Further, since the pressing plates 21 and 22 are provided on the rotor block 20 of one block from both sides in the axial direction, the permanent magnets 9 of the individual blocks can be prevented from being detached, and the reliability can be improved.

  Further, when a heat-resistant neodymium magnet is employed as the permanent magnet 9, it is desirable to reuse or separate and collect the permanent magnet 9 in consideration of the rare earth rare value. A configuration that can be easily attached and detached is desired. In the present embodiment, since the permanent magnet 9 is pressed by the pressing plates 21 and 22, the permanent magnet 9 can be held with high reliability, and in particular, reuse and separation / recovery can be performed as easily as possible.

  In order to further increase the attractive force, the permanent magnet 9 may be bonded to the rotor core 8 by using, for example, an adhesive, but in this case, it is necessary to pay close attention to the protrusion of the adhesive. In the present embodiment, the permanent magnet 9 can be reliably held without using an adhesive or the like as necessary.

  For example, if the lamination thickness of the rotor core 8 in the axial direction of the rotary shaft 10 is reduced, the amount of magnets, iron core material, and coil length can be reduced and the economy can be improved, but the torque ripple increases in terms of performance. Then, it is desired to suppress torque ripple by increasing the number of slots of the stator 4 and the number of magnetic poles of the rotor 5 or applying multi-stage skew to the rotor 5. Increasing the number of poles and the number of skew stages of the rotor 5 increases the number of permanent magnets 9. According to the present embodiment, since the pressing plates 21 and 22 are provided for each block, even if the number of permanent magnets 9 is increased by increasing the number of magnetic poles or by increasing the number of skews, all of these are provided. Detachment of the permanent magnet 9 can be prevented.

  Since the surface magnet-attached rotor 5 can be used for the elevator hoist 1, dynamic brake torque can be increased. The gearless type elevator hoisting machine 1 in this embodiment uses a 36-slot, 28-pole, 6-stage skew, and a rotational speed of 300 [rpm], but the conventional IPM system (embedded magnet built-in type) It is confirmed that the axial length and the amount of magnets can be reduced by 30% or more compared to the case where the rotating electrical machine is applied. The installation space, particularly the axial length can be shortened, and the demand for miniaturization can be satisfied.

(Second Embodiment)
FIG. 9 shows the second embodiment. The difference from the previous embodiment is that the front end of the permanent magnet is chamfered and the inner surface of the presser plate is in contact with the chamfered area of the permanent magnet. .

  The front side ends of the permanent magnet 9 are in contact with the inner surfaces (surface holding portions 21b and 22b) of the holding plates 21 and 22, but when the front side ends of the permanent magnet 9 are formed to have a cross section of 90 degrees, the holding plates 21 and 22 are provided. In addition, the stress tends to partially concentrate on the permanent magnet 9 as well. Therefore, in the present embodiment, the front side end of the permanent magnet 9 is chamfered at a predetermined chamfering angle θ as shown in FIG. FIG. 9B shows the chamfered permanent magnet 9 in a perspective view.

  If the surface pressing portion 21b of the pressing plate 21 is formed along the chamfering region 9a at the front side end of the permanent magnet 9, the surface pressing portion 21b comes into surface contact with each other. The chamfering angle θ may be set as appropriate. However, as shown in FIG. 9A, the chamfered areas 9a at the front side ends of the permanent magnets 9 adjacent to each other between the adjacent permanent magnets 9 are flush with each other. The chamfer angle θ should be set. Then, the presser plates 21, 22 are formed by forming the surface pressers 21 b, 22 b at the peripheral edges of the presser plates 21, 22 into a polygon twice as large as that in the above embodiment (in the above embodiment, in the case of a 28-sided shape, a double 56-fold shape) 22 can be configured. According to such an embodiment, the same effect as that of the above-described embodiment can be obtained, and the stress concentration between the presser plates 21 and 22 and the permanent magnet 9 can be reduced.

(Third embodiment)
10 and 11 show the third embodiment. The difference from the previous embodiment is that the presser plate has a structure protruding in the axial center direction of the rotating shaft and presses the surface of the permanent magnet. .

  In the present embodiment, a presser plate 23 is provided in place of the presser plates 21 and 22 of the previous embodiment. As shown in a cross-sectional view in FIG. 10 and a perspective view in FIG. 11, the pressing plate 23 includes a structure (protruding portion 23 a) that protrudes in the axial center direction of the rotating shaft 10 by the number of poles. In the example shown in FIGS. 10 and 11, the presser plate 23 is provided with a protruding portion 23 a having a curved surface located in the center of the surface of the permanent magnet 9 and curved in the axial center direction at the peripheral edge thereof. 23a presses a part of the surface of the permanent magnet 9 (mainly the center of the surface).

  10 and 11, the holding plate 23 is shown only on one side of the rotor core 8, but this is a drawing showing the contact area in an easy-to-understand manner. Provided on both sides of the core 6. As shown in the above-described embodiment, the rotary shaft 10 is installed so as to face both sides in the axial direction. The projecting portion 23a is formed in a point contact or a line contact with a substantially central portion of the surface of each permanent magnet 9, whereby a pressure directed from the outside to the inside can be applied to the permanent magnet 9. The restraining force of 9 can be increased.

(Fourth embodiment)
FIG. 12 shows the fourth embodiment. The difference from the previous embodiment is that the front end of the flat plate permanent magnet is chamfered, and the surface pressing portion of the press plate is placed in the chamfered area of the front side end of the flat plate permanent magnet. It exists in the place provided with the press part pressed in an axial center direction.

  In the present embodiment, the presser plate 24 is provided as shown in FIG. Both ends of the permanent magnet 9 are provided with chamfered chamfered regions 9b, and both ends of the permanent magnet 9 are formed into inclined surfaces. In addition, FIG.12 (b) shows the permanent magnet 9 with a perspective view.

The presser plate 24 includes a projecting portion 24a that presses a part of the surface of the permanent magnet 9 in the same manner as the presser plate 23 of the above-described embodiment. In addition to the projecting portion 24a, the chamfers at both ends on the front side of the permanent magnet 9 are provided. A pressing portion 24b that abuts against the inclined surface of the region 9b is further provided. In the structure shown in FIG. 12A, the contact area between the surface and both ends of each permanent magnet 9 and the inner surface of the presser plate 24 is supported at a three-point cross section in the axial radial section, and is supported at one or two points in cross section. Compared with the structure which carries out, it can support stably and can relieve stress concentration.
Even in such an embodiment, the same effects as those of the above-described embodiment can be obtained, and stress concentration between the presser plate 24 and the permanent magnet 9 can be reduced.

(Fifth embodiment)
FIG. 13 and FIG. 14 show the fifth embodiment. The difference from the previous embodiment is that the presser plate is located between the side surfaces of the permanent magnets adjacent to each other in the axial direction of the rotating shaft, and is in the axial center direction of the rotating shaft. It is in the place provided with the fitting part fitted toward.

  In the present embodiment, a presser plate 25 is provided in place of the presser plate 21 of the previous embodiment. 13 and 14, the pressing plate 25 is shown only on one side of the rotor core 8, but is installed so as to substantially face both axial sides of the rotating shaft 10.

  As shown in FIGS. 13 and 14, the presser plate 25 is a permanent member adjacent to the circumferential direction of the rotary shaft 10 in addition to the surface presser portion 25 a having the function of the surface presser portion 21 b or 22 b of the first embodiment. A fitting portion 25b is provided between the side surfaces of the magnet 9 to be fitted toward the center of the shaft diameter.

  13 and 14 show a view in which the presser plate 25 is provided only on one side of the rotor core 8, the presser plate 25 is arranged in the axial direction of the rotary shaft 10 to prevent the permanent magnet 9 from being detached. Installed to face both sides. The permanent magnets 9 that are adjacent to each other in the axial direction of the rotating shaft 10 are denoted by reference numerals as the first permanent magnet 26 and the second permanent magnet 27 in FIG. 14, and the first permanent magnet 26 and the second permanent magnet 27 are rotated. The opposite side surfaces facing each other in the axial direction are defined as a first side surface 26 a of the first permanent magnet 26 and a second side surface 27 a of the second permanent magnet 27.

  A peripheral edge portion of the pressing plate 25 is provided as a surface pressing portion 25a along the surface of the permanent magnet 9, and a fitting portion 25b is provided between the adjacent surface pressing portions 25a. The fitting portion 25b is formed integrally with the surface pressing portion 25a by processing a stainless steel plate material of the pressing plate 25.

  The fitting portion 25b is formed by bending a plate material continuous from the surface pressing portion 25a of the permanent magnet 9. The fitting portion 25 b includes a side surface protruding from the surface of the guide 8 c of the rotor core 8, a surface of the guide 8 c, and a second side surface 27 a of the second permanent magnet 27 among the first side surface 26 a of the first permanent magnet 26. Among them, the guide 8c is bent in order along the side surface protruding from the surface. Thereby, the fitting part 25b is fitted between the adjacent first and second permanent magnets 26 and 27. Thereby, since the fitting part 25b is fitted along the both side surfaces of the permanent magnets 26 and 27 together with the guide 8c, the movement of the permanent magnet 9 in the axial direction of the rotary shaft 10 can be restricted.

(Sixth embodiment)
15 and 16 show the sixth embodiment. The difference from the previous embodiment is that the presser plate is located between the side surfaces of adjacent permanent magnets and is fitted toward the axial center of the rotating shaft. The outer peripheral surface in the axial radial direction of the rotor core 8 is provided so as to be flush with each other.

15 and 16, the pressing plate 25 is shown only on one side of the rotor core 8, but is installed so as to substantially face both axial sides of the rotating shaft 10.
Also in the present embodiment, the presser plate 25 includes a fitting portion 25 c that fits between the side surfaces of the permanent magnets 9 that are adjacent to each other in the axial direction of the rotary shaft 10. For this reason, movement of the permanent magnet 9 can be restricted in the axial direction of the rotating shaft 10.

  If the outer circumferential surface of the rotor core 8 in the axial radial direction is formed flush, the movement restricting force of the permanent magnet 9 in the axial circumferential direction of the rotary shaft 10 by the guide 8c is reduced, but the holding plate 25 Since the fitting portion 25 b is fitted between the side surfaces of the adjacent permanent magnets 9, the movement of the permanent magnet 9 can be restricted in the axial direction of the rotating shaft 10. Further, the rotor core 8 is easily formed since the outer peripheral surface is flush with the guide 8c of the above-described embodiment.

(Other embodiments)
Although the example applied to the elevator hoisting machine 1 is shown, the present invention can be applied to other industrial equipment having several hundreds of revolutions. The chamfer angles of the chamfer regions 9a and 9b may be set as appropriate as shown in the above-described embodiment. Therefore, the chamfering angle may be 45 degrees or any number of times. The C chamfering of the permanent magnet 9 represents a form in which the front end is chamfered with an inclined surface, and is not limited to 45 degrees. Further, the front end of the permanent magnet 9 may be rounded (R chamfered).

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

In the drawings, 1 is an elevator hoisting machine, 2 is an electric motor (surface magnet-attached rotating electrical machine), 5 is a rotor (rotor of a surface magnet-attached rotating electrical machine), and 8 is a rotor core (rotor main part). , 8c is a guide, 9 is a permanent magnet (flat plate permanent magnet), 10 is a rotating shaft, 19 is a rotor body, 20 is a rotor block, 21 to 25 are pressing plates, 21b, 22b and 25a are surface pressing portions, 21a , 22a are side pressing parts, 23a and 24a are protruding parts, 24b is a pressing part, and 25b is a fitting part.

Claims (8)

A rotor main portion that is formed in a cylindrical shape and is fixed to a rotating shaft, and the number of poles is provided in the axial direction of the rotating shaft on the cylindrical surface of the rotor main portion, and a back surface is provided on the cylindrical surface of the rotor main portion. A plurality of affixed flat plate permanent magnets are provided in a rotor block for each block, and the rotor is formed in a state where the arrangement center of the flat plate permanent magnets is shifted step by step in the axial direction of the rotation axis for each block. A multi-stage skew type rotor body constituted by fixing a plurality of blocks to the rotation shaft;
A non-magnetic annular retainer plate that is mounted on a plurality of rotor blocks so as to face each other from both sides in the axial direction of the rotating shaft and has a surface pressing portion that presses the surface of the plurality of flat plate permanent magnets toward the axial center of the rotating shaft. And a rotor for a surface magnet affixed rotary electric machine.   2. The rotor of a surface magnet-attached rotary electric machine according to claim 1, wherein the presser plate has an inner peripheral surface including a surface presser portion formed into a polygonal shape. The front end of the flat plate permanent magnet is chamfered,
3. The rotor of a surface magnet-attached rotary electric machine according to claim 1, wherein the presser plate is formed such that an inner surface portion thereof abuts along a chamfer region of the flat plate permanent magnet.   2. The rotor of a surface magnet-attached rotary electric machine according to claim 1, wherein the presser plate includes a protrusion that presses the surface of the flat permanent magnet and protrudes in the axial center direction of the rotation shaft. The front end of the flat plate permanent magnet is chamfered,
5. The rotor of a surface magnet-attached rotary electric machine according to claim 1, wherein the presser plate includes a pressing portion that presses the chamfered region of the front side end of the flat plate permanent magnet in the axial center direction of the rotation shaft.   The presser plate includes a fitting portion that fits between side surfaces of a plurality of flat plate permanent magnets adjacent to each other in the axial circumferential direction of the rotating shaft toward the axial center of the rotating shaft. A rotor for a rotating electric machine with a surface magnet. The rotor main part is configured such that the outer peripheral surface in the axial diameter direction of the rotating shaft is flush with
7. The rotor of a surface magnet-attached rotary electric machine according to claim 6, wherein the presser plate restricts the movement of the plate permanent magnet in the circumferential direction of the rotary shaft by the fitting portion. The rotor main portion includes a plurality of guides that extend along the axial direction of the rotation shaft and project outward from the shaft diameter, and a flat plate permanent magnet is attached between the guides. A rotor of a surface magnet-attached rotary electric machine according to claim 1.

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