JP2014072971A - Rotor for surface magnet affixed rotary electric machine and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor for a surface magnet affixed rotary electric machine capable of sufficiently securing reliability by fixing a plate permanent magnet around an outer circumference of a main part of the rotor stably for a long time, and a manufacturing method capable of improving productivity by suppressing the time required for manufacturing and inspection steps as further as possible.SOLUTION: A rotor for a surface magnet affixed rotary electric machine comprises, in a rotor block for each block, a rotor main part which is formed cylindrical and fixed to a rotary shaft, and a plurality of plate permanent magnets which are provided on a cylinder surface of the rotor main part as many as poles in a shaft circumferential direction of the rotary shaft, and of which the rear face is affixed to the cylinder surface of the rotor main part. The rotor for the surface magnet affixed rotary electric machine also comprises a multiple stage skew type rotor main body which is configured by fixing a plurality of rotor blocks to the rotary shaft while displacing the arrangement center of the plate permanent magnets step by step for each block in the shaft circumferential direction of the rotary shaft. The rotor for the surface magnet affixed rotary electric machine further comprises a cover which is configured by shrinking a cylindrical plate of a non-magnetic substance in a radial direction of the rotary shaft, covers an outer surface of the rotor block of all the blocks and is adhered to outer surfaces of all the plate permanent magnets provided in the rotor blocks of all the blocks.

Description

  Embodiments described herein relate generally to a rotor of a surface magnet-attached rotary electric machine and a method for manufacturing the same.

  For example, a rotary electric machine used for an elevator hoisting machine is mainly of an IPM (Interior Permanent Magnet) type. 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. However, under the influence of the recent surge in rare earth elements, it is desired to reduce the amount of permanent magnets used. 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 outage, the dynamic winding is operated by generating a braking force corresponding to the rotation of the rotor by short-circuiting the stator winding of the elevator hoisting machine. As compared with the IPM system, the permanent magnet disposed on the rotor is more likely to generate dynamic brake torque because the SPM system is closer to the stator inner end.

  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 adhesive 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. Moreover, productivity is lowered.

  As the number of permanent magnets increases, the time required for processes such as positioning and bonding of the permanent magnets also increases, and the time required for the inspection process for maintaining quality also increases. In addition, when the flat plate permanent magnet is attached to the rotor main part, it is necessary to temporarily fix the flat plate permanent magnet until the flat plate permanent magnet is displaced from the normal position or until the adhesion is stable, thus reducing the quality and productivity.

JP 2002-78257 A JP 2012-125076 A

  The rotor of the surface magnet-attached rotary electric machine, which can secure the reliability sufficiently by stably fixing the plate permanent magnet to the outer periphery of the rotor main part for a long time, and the time required for the manufacturing and inspection processes Provided is a production method capable of improving productivity by suppressing as much as possible.

  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 rotor body constituted by fixing a plurality of rotor blocks to the rotation shaft in a state where the center of the plate permanent magnet is shifted stepwise in the circumferential direction of the rotation shaft for each block. Prepare. In addition, a cylindrical plate made of a nonmagnetic material is contracted in the radial direction of the rotating shaft, covers the outer surface of the rotor block of all blocks, and all the plate permanent magnets provided in the rotor blocks of all blocks. A cover that adheres to the outer surface is provided.

  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 rotor body constituted by fixing a plurality of rotor blocks to the rotation shaft in a state where the center of the plate permanent magnet is shifted stepwise in the circumferential direction of the rotation shaft for each block. Prepare. In addition, a cylindrical nonmagnetic cover that covers the outer surfaces of the rotor blocks of all the blocks is provided. Moreover, the end plate which is provided in the axial direction both ends of the rotating shaft of a rotor main body, and clamps a cover in an axial direction is provided.

  A method for manufacturing a rotor of a surface magnet-attached rotary electric machine according to an embodiment includes a step of attaching flat plate permanent magnets to the cylindrical surface of the main part of the rotor for the number of poles in the circumferential direction. Further, the method includes a step of installing a rotor block in which a flat plate permanent magnet is provided on the surface of the cylinder on the rotation shaft for each block. Moreover, the process of heating a cylindrical nonmagnetic cover and expanding a diameter is provided. Further, the method includes a step of disposing a cover having an enlarged diameter so as to cover the outer periphery of the rotor blocks of all blocks. Moreover, the cover is cooled, and the cover is contracted in the radial direction so as to be in close contact with the outer surfaces of all the plate permanent magnets of the rotor blocks of all the blocks.

  A method for manufacturing a rotor of a surface magnet-attached rotary electric machine according to an embodiment includes a step of attaching flat plate permanent magnets to the cylindrical surface of the main part of the rotor for the number of poles in the circumferential direction. Further, the method includes a step of installing a rotor block in which a flat plate permanent magnet is provided on the surface of the cylinder on the rotation shaft for each block. Further, the method includes a step of disposing a cylindrical nonmagnetic cover so as to cover the outer periphery of the rotor blocks of all blocks. In addition, a step is provided in which the cover is sandwiched by end plates from both axial ends of the rotating shaft for the rotor blocks of all blocks.

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 basic composition of the rotor main body about 1st Embodiment The perspective view which shows one rotor block about 1st Embodiment The perspective view which shows the aspect of the guide provided in a rotor iron core 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) The perspective view which shows the one manufacturing step of the rotor about 1st Embodiment (the 3) The perspective view which shows the one manufacturing step of the rotor about 2nd Embodiment (the 4) FIG. 3 equivalent view showing the third embodiment The perspective view which shows the structure of a flat plate permanent magnet about 3rd Embodiment Sectional drawing which expands and shows the contact area of a flat plate permanent magnet and a cover about 3rd Embodiment The perspective view which shows the structure of a cover about 3rd Embodiment The perspective view which shows the one manufacturing step of the rotor about 3rd Embodiment (the 5) The perspective view which shows the one manufacturing step of the rotor about 3rd Embodiment (the 6) (A) FIG. 12 equivalent figure, (b) FIG. 11 equivalent figure shown about 4th Embodiment FIG. 12 equivalent diagram showing the fifth 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. In addition, between several embodiment demonstrated below, the same or similar component is attached | subjected to the same or similar code | symbol, description is abbreviate | omitted as needed, and it demonstrates centering on a different part.

(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 on a rotor core (corresponding to the main part of the rotor) 8 made of a number of steel plates disposed on the inner peripheral side of the stator 4 via a gap, and an outer peripheral surface of the rotor core 8. A permanent magnet (corresponding to a flat plate permanent magnet) 9 to which the back surface is attached, and a rotating shaft 10 inserted and fixed at the center of the rotor core 8 are provided.

  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 positioned on the hoisting machine load 3 side of the body portion 11, and the bearing bracket 12 is disposed on the opposite side of the bearing bracket 13 with the body portion 11 interposed therebetween.

  Bearings 14 and 15 are fixed to the bearing brackets 12 and 13, respectively, and the rotating shaft 10 of the rotor 5 is supported by 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 sheave connected to the end 10a of the rotating shaft 10, and a rope 17 for hanging an elevator car is hung on the groove 16. In the elevator hoisting machine 1 of the present embodiment, for example, the rotational speed is about 300 [rpm], and the electric motor 2 has a configuration of 36 slots and 28 poles.

  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 disk brake 18 is not shown, the armature always abuts against the disk fixed to the end of the rotating shaft on the side opposite to the load, applies a braking force, and the electromagnetic device is energized. Is attracted to the electromagnet device and is separated from the disk, and has a known configuration in which the rotating shaft 10 is in a rotatable state (braking release state).

  Now, FIG. 3 shows a rotor body 19 which is a basic configuration of the rotor 5. 4 shows one rotor block 20, and FIG. 5 shows the configuration of the rotor core 8 for one block. The rotary shaft 10 is fixed to the rotor core 8 by being press-fitted, fitted, or inserted into a shaft hole 8 a (see FIG. 4) of each rotor core 8. The rotating shaft 10 may be formed with a hollow center portion along the axial direction.

  As shown in FIG. 3, the rotor body 19 has a structure in which a plurality of blocks of rotor blocks 20 are stacked in the axial direction of the rotary shaft 10. 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 that restricts the movement of the rotor block 20 in the rotation direction when the rotating shaft 10 rotates. The shaft groove 8 b is formed along the axial direction of the rotary shaft 10, and engages with a fitting portion formed on the outer peripheral surface of the rotary shaft 10. The shaft groove 8 b is engaged with the rotary shaft 10. When the rotary shaft 10 rotates, the rotor block 20 also rotates together.

  As shown in FIG. 5, the rotor core 8 has guides 8 c (corresponding to a second guide) formed on the outer circumferential surface thereof at predetermined intervals in the axial circumferential direction to secure an installation space for the permanent magnet 9. These guides 8 c protrude from the cylindrical surface of the rotor core 8 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 outer surface of the rotor core 8 between the guides 8c is permanently attached to the outer surface of the rotor core 8. A magnet 9 is attached. Thereby, the guide 8c can be provided in the both sides lower end of the permanent magnet 9, and the permanent magnet 9 can be controlled to move in the axial circumferential direction.

  Further, as shown in FIG. 5, the rotor core 8 includes guides 8 d (corresponding to the first guide) that are provided at both ends in the axial direction of the rotary shaft 10 along the circumferential direction of the rotary shaft 10. The outer shape of the guide 8d protrudes in a disk shape from the installation surface (plane) of the permanent magnet 9 toward the outer diameter of the rotary shaft 10. The guide 8d may be provided only at one axial end of the rotating shaft 10. This is because the side surfaces of the rotor block 20 face each other and are connected and connected, and if at least one guide 9d is provided at the connection portion, the function is satisfied.

  When a magnet that is as powerful as possible is used as the permanent magnet 9, for example, a heat-resistant neodymium magnet in which neodymium, iron, boron, or the like is used as a main component and part of neodymium is 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, priority is given to the ease of manufacturing the mold, and the permanent magnet 9 is three-dimensionally formed in a flat plate (the outer shape is a rectangular parallelepiped).

  The permanent magnet 9 is temporarily fixed to the cylinder surface of the rotor core 8 using an adhesive before magnetization. In this embodiment, since the guide 8c of the permanent magnet 9 is provided on both sides in the axial direction of the rotary shaft 10 and the guide 8d is provided on both sides in the axial direction, the positional displacement of the permanent magnet 9 is prevented as much as possible. Can be temporarily fixed with an agent.

  In the present embodiment, as shown in FIG. 4, 28 permanent magnets 9 are arranged side by side along 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. This constitutes 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. As described above, the rotor block 20 of the SPM type rotating electrical machine can be configured.

  As shown in FIG. 3, one block of the rotor block 20 is stacked in a plurality of blocks in the axial direction of the rotating shaft 10. Permanent magnets 9 are arranged on the outer peripheral surfaces of the rotor cores 8 of all these blocks by the number of poles, but the fixed positions of the permanent magnets 9 among all these blocks are relatively rotational axes. It is shifted stepwise in the axial direction of ten. Thereby, a stepped skew is formed.

  As shown in FIG. 1, the cover 21 covers the surface of the permanent magnet 9. The cover 21 is molded using, for example, stainless steel having a thickness of 0.3 mm. The cover 21 is in close contact with the surface of the permanent magnet 9 and extends across the adjacent permanent magnets 9 to cover the surfaces of all the permanent magnets 9. Thereby, even if a centrifugal force is applied to the rotor 5, it can be pressed from the outer peripheral side and the permanent magnet 9 can be held. End plates 22 are provided at both axial ends of the rotor core 8 of all blocks. Each of these end plates 22 is formed in an annular shape, and the inside thereof is fixed to the outer periphery of the rotating shaft 10.

  A method for manufacturing the rotor 5 will be described. First, as shown in FIG. 5, the rotor core 8 is formed by stacking steel plates for each block. At this time, as many flat surfaces as the number of poles are provided on the outer peripheral surface of the rotor core 8, and guides 8c and 8d are respectively formed on the axial end and the axial end of the flat surface. Then, the permanent magnet 9 is positioned inside the guides 8c and 8d, and is affixed to the cylinder surface of the rotor core 8 using an adhesive and temporarily fixed, and then the permanent magnet 9 is magnetized.

  Next, the annular end plate 22 (refer to the cross section of FIG. 2) on one side is inserted into the rotating shaft 10, and the rotor block 20 is inserted into the rotating shaft 10 as shown in FIG. The shaft groove 8b is fitted to the rotary shaft 10 and fixed so as not to be displaced in the axial direction. The fitting process of these rotor cores 8 is repeated for all blocks.

  3 is manufactured by inserting the other annular end plate 22 into the rotary shaft 10 and sandwiching it between the two end plates 22 from the outside in the axial direction of the rotary shaft 10 after repeating all blocks. . Note that the timing at which the rotor body 19 is clamped by the end plate 22 is not limited to this timing.

Next, as shown in FIG. 7, a jig 23 having a heating and tube expansion function is installed so as to cover the shaft peripheral end of the rotating shaft 10. At this time, the jig 23 is disposed adjacent to the rotor body 19.
Only a part of the jig 23 shown in FIG. 7 is shown, and a control mechanism (not shown) is also provided in front of the rotating shaft 10 shown in FIG. This control mechanism enables the heating pieces 23a to 23c of the jig 23 to be controlled to move to the target position.

  The jig 23 includes arc-shaped heating pieces 23a to 23c that cover a part of the outer diameter of the rotary shaft 10 in a circumferential shape, and a space 23d is provided between the heating pieces 23a to 23c. These spaces 23 d are provided along the axial direction of the rotary shaft 10.

  The heating pieces 23a to 23c can be adjusted in temperature by a control device (not shown), and the inner and outer diameters of the arc around the axis of the rotary shaft 10 can be expanded and contracted by the control mechanism. Moreover, although not shown in figure, the jig | tool 23 is provided with the extrusion piece which makes it possible to extrude the cylindrical cover 21 along an axial direction.

  First, the inner and outer diameters of the arcs of the heating pieces 23 a to 23 c of the jig 23 are reduced from the outer shape of each rotor block 20. The cover 21 is formed into a cylindrical shape with stainless steel, and the cylindrical cover 21 is mounted along the outer surfaces of the heating pieces 23a to 23c. At this time, since the inner diameter of the cover 21 is smaller than the outer diameter (outer shape) of each rotor main body 19, even if the cover 21 is directly extruded onto the outer peripheral surface of the rotor main body 19 by the extruded piece of the jig 23, It cannot be mounted on the outer peripheral surface of the rotor block 20.

  Thereafter, the heating pieces 23a to 23c are heated and the arc diameters of the heating pieces 23a to 23c are gradually enlarged, so that the cover 21 is extended and the diameter of the cover 21 is gradually enlarged. The expansion amount at this time is 0.1 to 0.2 times, for example, but the magnification is not limited to this range.

  Next, as shown in FIG. 8, the cover 21 is moved along the axial direction of the rotary shaft 10 by moving the extruded piece (not shown) of the jig 23 along the space 23 d, and the rotor main body is moved. A cover 21 is installed so as to cover the outer peripheral surface of 19.

  Then, for example, natural heat is radiated from the cover 21. The cover 21 contracts in the radial direction when cooled. As described above, for example, the inner diameter of the cover 21 is smaller than the outer shape (outer diameter) of the rotor body 19 at room temperature. For this reason, when the cover 21 is cooled, the cover 21 is brought into close contact with the outer surface of the permanent magnet 9 and is extended between the adjacent permanent magnets 9. Thereby, the cover 21 can be closely adhered and fixed along the surfaces of the permanent magnets 9 of all blocks, and the permanent magnets 9 can be pressed toward the axial center direction. Thereby, even if the action by the centrifugal force is applied to the rotor 5, it is possible to prevent the permanent magnet 9 from being detached.

  In this embodiment, since the cover 21 is installed in close contact with the surface of the permanent magnet 9, there is no need to fix the cover 21 to the end plate 22. The cover 21 may be fixed using a fixing pin or the like. Since the manufacturing method of the other structure (stator 4 grade | etc.,) Of the elevator hoist 1 is the same as that of a prior art, the description is omitted.

  In the elevator hoist 1 including the stator 4 and the rotor 5, a drive signal is supplied to the winding 7 of the stator 4 of each phase from a drive circuit (not shown). Then, the rotating force acts on the rotor 5 to rotate, and the power is transmitted to the hoisting machine load 3 connected to the rotating shaft 10. Then, the elevator car can be moved up and down by operating the rope 17.

  According to the present embodiment, since the cover 21 is provided in close contact with the outer peripheral surface of the rotor block 20, even if centrifugal force is applied to the rotor 5, the permanent magnet 9 can be prevented from being detached and scattered, and the reliability can be improved. It can be improved. The outer shape of the rotor body 19 can be configured without resin molding.

  In the present embodiment, a heat-resistant neodymium magnet is used as the permanent magnet 9. However, in consideration of the rare value of rare earths, it is desirable to reuse or separate and collect the permanent magnet. Therefore, a configuration that can be easily attached and detached is desired. In the present embodiment, since the cover 21 is held in close contact with the surface of the permanent magnet 9, the permanent magnet 9 can be held with high reliability, and in particular, reuse and separation / recovery can be performed as easily as possible.

  The permanent magnet 9 is bonded to the cylinder surface of the rotor iron core 8 using an adhesive. In this case, it is necessary to pay close attention to the protruding of the adhesive material. In this embodiment, since the guides 8c and 8d are provided beside the installation position of the permanent magnet 9, the permanent magnet 9 can be positioned.

  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, the torque ripple can be suppressed by increasing the number of slots of the stator 4 and the number of magnetic poles of the rotor 5 or applying a multi-stage skew to the rotor 5, thereby suppressing the vibration of the elevator car.

  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 cover 21 is installed as close as possible to the surface of the permanent magnet 9, even if the number of permanent magnets 9 is increased by increasing the number of magnetic poles or increasing the number of skews, the permanent magnet 9 can be prevented from being separated or scattered.

  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 the present embodiment uses 36 slots, 28 poles, 6 steps skew, and a rotational speed of 300 [rpm]. The inventors have confirmed that the axial length and the magnet amount can be reduced by 30% or more as compared with the case where a rotating electrical machine is applied. As a result, 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 a groove is formed in the rotor core, and a double-sided tape is applied in the groove to temporarily fix the permanent magnet. .
As shown in FIG. 9, when the rotor core 8 is formed, guides 9c are provided on both sides of the lower end of the sticking surface of the permanent magnet 9, and the guide 9c has grooves 9ca formed on the sticking surface. Has been. The groove 9ca becomes a groove for attaching the double-sided tape 24, and the double-sided tape 24 is embedded in the groove 9ca.

  The groove 9ca is located at the axial center of the rotor core 8 and is formed to have the same width as the double-sided tape 24, and is the same along the circumferential direction of the outer peripheral surface (cylindrical surface) of the rotor core 8. It is formed with depth. The outer peripheral surface of the rotor core 8 is recessed from the outer peripheral surface of the rotor core 8 by the groove 9ca by the thickness of the double-sided tape 24. When the double-sided tape 24 is applied, the outer peripheral surface of the rotor core 8 becomes flush. .

  When manufacturing the rotor block 20, the double-sided tape 24 is attached along the outer peripheral surface of the rotor core 8, for example, on the axial center surface. And the permanent magnet 9 is stuck on the double-sided tape 24 located inside the guide 9c. Then, the possibility that the permanent magnet 9 is peeled off after the permanent magnet 9 is attached to the rotor core 8 can be eliminated as much as possible. For example, when the operator performs the assembly work of the rotor block 20, the transport work between the processes, etc., the rotor block 20 becomes easy to handle.

(Third embodiment)
10 to 15 show a third embodiment. The difference from the previous embodiment is that the rotor body is covered with a cylindrical cover and the cover is fixed with an end plate. As shown in FIG. 10, the cover 25 covers the outside of the shaft diameter of the rotor core 8 and the permanent magnet 9. The cover 25 is formed as a cylindrical plate with a non-magnetic material using, for example, stainless steel as in the above-described embodiment, and shows a locking tool for preventing the permanent magnet 9 from coming off in the radial direction.

  End plates 26 and 27 are provided at the axial ends of the rotor body 19, respectively. Each of the end plates 26 and 27 is provided with one or a plurality of pin insertion holes 26a and 27a in a part of the radially outer edge portion thereof.

  A locking groove 25b for fixing is provided at the axial end of the cover 25. When the cover 25 is mounted so as to cover the outer peripheral surfaces of the rotor core 8 and the permanent magnet 9, the locking groove 25 b is located at the same location as the holes 26 a and 27 a of the end plates 26 and 27. Therefore, the placement position of the cover 25 with respect to the rotor core 8 and the permanent magnet 9 is fixed by driving and fixing the pin 28 into the locking groove 25b of the cover 25 and the holes 26a, 27a of the end plates 26, 27. Even if the rotor 5 rotates, the positional deviation of the cover 25 can be prevented.

  Since the cylindrical cover 25 is manufactured using one flat plate, as shown in FIG. 10, there is a joint portion 25a. The joint portion 25a is provided by welding both ends of the flat plate. The outer surface of the cylinder of the cover 25 is easily polished, and the joint portion 25a can be flush with the outer surface of the tube of the cover 25. However, the inner surface of the cylinder of the cover 25 is particularly difficult to polish. The protrusion 25c (see the cross-sectional view of FIG. 12) may remain inward.

  Therefore, as shown in FIG. 10, the joint portion 25a is inclined from the axial direction, and the extending direction of the joint portion 25a is set, for example, as a straight line in the direction along the skew forming direction. And the joint part 25a is located in the clearance gap between the adjacent permanent magnets 9. FIG. Thereby, even if the protrusion 25c of the joint portion 25a exists on the inner surface of the cylinder of the cover 25, the joint portion 25a can be positioned without contacting the permanent magnet 9 as much as possible, and the joint portion 25a can be arranged without difficulty.

  In particular, as shown in FIG. 11, when the chamfered region 9a is provided by rounding the front end surface in the axial direction of the permanent magnet 9 to provide a chamfered region 9a, a joint 25a is formed between adjacent chamfered regions 9a as shown in FIG. By providing, the joint portion 25a can be positioned without bringing the projecting piece 25c into contact with the permanent magnet 9 as much as possible. Further, the stress can be dispersed when the inner surface of the cover 25 comes into contact with the chamfered region 9 a at the front end of the permanent magnet 9.

Hereinafter, the manufacturing method will be described. First, the rotor body 19 is manufactured in the same manner as in the previous embodiment. Moreover, the cylindrical cover 25 is manufactured in another process.
In this case, the opposing two sides of the flat plate are formed in an inclined shape to form a parallelogram with the long side and the short side parallel to each other, and then, as shown in FIG. Are connected to each other and the short sides are welded together to form a joint portion 25a. Then, the cover 25 can be formed in a cylindrical shape, and can be provided so as to be inclined in substantially the same direction as the skew angle in the extending direction of the joint portion 25a.

  Next, as shown in FIG. 14, after the end plate 27 on one side is inserted into the rotating shaft 10, the rotor block 20 (rotor body 19) of all blocks is inserted into the rotating shaft 10. Next, a cylindrical cover 25 is inserted into the rotary shaft 10 so as to cover the rotor cores 8 of all the blocks and the permanent magnets 9 attached to the surface of the rotor cores 8, and disposed so as to cover the rotor body 19.

  Subsequently, the end plate 26 on the other side is inserted into the rotary shaft 10. Thereafter, the pin 28 is inserted into the locking groove 25b of the cover 25 and the holes 26a and 27a of the end plates 26 and 27 shown in FIG. 14 (see FIG. 15), and the end plates 26 and 27 and the cover 25 are fixed. . In this way, the rotor 5 is manufactured. Other configurations are substantially the same as those of the above-described embodiment.

  As described above, according to the present embodiment, since the cover 25 is provided along the outer peripheral surfaces of the rotor core 8 and the permanent magnet 9, the permanent magnet 9 is detached even if centrifugal force is applied to the rotor 5. Can be prevented and reliability can be improved.

(Fourth embodiment)
FIG. 16 shows the fourth embodiment, and the difference from the previous embodiment is that the shape of the permanent magnet is changed.
In this embodiment, as shown in a perspective view of the permanent magnet 9 in FIG. 16B, the front end of the permanent magnet 9 is chamfered at a predetermined chamfering angle (see the chamfered region 9b). Since the surface of the permanent magnet 9 is in contact with the inner surface of the cylindrical cover 25, the contact area between each permanent magnet 9 and the cover 25 is widened to reduce stress concentration, as shown in the cross section of FIG. it can. The chamfer angle may be changed as appropriate.

  If the chamfer angle is made steeper, the gap between the adjacent permanent magnets 9 can be further enlarged. If the joint portion 25a shown in FIG. 10 is positioned in the gap between the adjacent permanent magnets 9, the margin of the space for arranging the joint portion 25a can be increased. Even in such an embodiment, the same effects as those of the above-described embodiment can be obtained, and stress concentration on the surface of the permanent magnet 9 can be reduced.

(Fifth embodiment)
FIG. 17 shows the fifth embodiment. The difference from the previous embodiment is that the joint is provided in a radially outward space at the center of the flat plate permanent magnet. In the present embodiment, as shown in the cross-sectional view of the main part in FIG. 17, the joint portion 25 a is disposed above the center of the permanent magnet 9. Even if the joint portion 25 a includes the projecting piece 25 c inside the cylinder of the cover 25, the projecting piece 25 c can be arranged on the outer side of the rotary shaft 10 positioned on the front side of the permanent magnet 9.

  In the above description, the permanent magnet 9 is a flat plate permanent magnet. The flat plate permanent magnet mainly has a rectangular parallelepiped shape. In the above-described embodiment, various embodiments applied to the elevator hoist 1 have been described. However, the present invention can be applied to other industrial equipment having about several hundreds of revolutions.

  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). , 8a are shaft holes, 8c and 8d are guides, 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 is a cover, 22 is an end plate, and 25 is A cover, 25a is a joint, and 28 is a pin.

Claims (10)

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 the rotor block for each block, and the rotation axis of the rotor block is shifted in a stepwise manner for each block in the circumferential direction of the rotation axis of the flat plate permanent magnet. A multi-stage skew type rotor body configured to be fixed to a plurality of
The outer surface of all the plate permanent magnets provided on the rotor blocks of all the blocks as well as covering the outer surface of the rotor blocks of all the blocks, which are configured by the cylindrical plate of nonmagnetic material contracting in the radial direction of the rotating shaft A cover closely attached to the
A rotor for a surface magnet-attached rotary electric machine, comprising: 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 the rotor block for each block, and the rotation axis of the rotor block is shifted in a stepwise manner for each block in the circumferential direction of the rotation axis of the flat plate permanent magnet. A multi-stage skew type rotor body configured to be fixed to a plurality of
A cylindrical non-magnetic cover covering the outer surface of the rotor block of all blocks;
End plates that are provided at both axial ends of the rotating shaft of the rotor body and sandwich the cover in the axial direction;
A rotor for a surface magnet-attached rotary electric machine, comprising:   3. The rotor of a surface magnet-attached rotary electric machine according to claim 2, wherein the cover is fixed to the end plate using a pin. The front end of the flat plate permanent magnet is chamfered,
4. The rotor of a surface magnet-attached rotary electric machine according to claim 1, wherein an inner surface of the cover abuts along a chamfer region of the flat plate permanent magnet. The cover is formed in a cylindrical shape with a joint portion that rounds the flat plate and joins the side portions of the flat plate,
The surface magnet pasting type rotation according to any one of claims 1 to 4, wherein a joint portion connecting the side portions of the flat plate is formed along a skew forming direction of a plurality of stages of rotor blocks. Electric rotor. The cover is formed in a cylindrical shape with a joint portion that rounds the flat plate and joins the side portions of the flat plate,
The joint portion, which joins the side portions of the flat plate, is separated from the contact portion where the cover and the flat plate permanent magnet are in contact with each other, and is provided in a radially outward space at the center of the flat plate permanent magnet. The rotor of the surface magnet pasting type rotating electrical machine according to any one of 5.   The surface magnet pasting type rotating electrical machine according to any one of claims 1 to 6, further comprising a first guide that is positioned at least at one axial end of the rotating shaft of the rotor main portion and projects in the axial radial direction. Rotor. A second guide that is provided on the cylindrical surface of the main part of the rotor and projects along the axial direction of the rotary shaft and is provided apart from each other in the circumferential direction of the rotary shaft;
The surface magnet-attached rotary electric machine according to any one of claims 1 to 7, wherein the second guide is located in a central portion along the axial direction of the rotary shaft and has a groove for attaching a double-sided tape. Rotor. A step of providing flat permanent magnets on the cylindrical surface of the main part of the rotor for the number of poles in the circumferential direction;
A step of installing a rotor block with a flat plate permanent magnet provided on the cylinder surface on the rotating shaft for each block;
Heating the cylindrical non-magnetic cover to enlarge the diameter;
Disposing a cover having an enlarged diameter so as to cover the outer periphery of the rotor block of all blocks;
The cover is cooled so that the cover is contracted in the radial direction and closely adhered to the outer surfaces of all the plate permanent magnets of the rotor blocks of all blocks;
A method for manufacturing a rotor of a surface magnet-attached rotary electric machine, comprising: A step of providing flat permanent magnets on the cylindrical surface of the main part of the rotor for the number of poles in the circumferential direction;
A step of installing a rotor block with a flat plate permanent magnet provided on the cylinder surface on the rotating shaft for each block;
A step of disposing a cylindrical non-magnetic cover so as to cover the outer periphery of the rotor block of all blocks;
Sandwiching the cover with end plates from both axial ends of the rotating shaft for all rotor blocks; and
A method for manufacturing a rotor of a surface magnet-attached rotary electric machine, comprising:

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