CN202475060U - Rotor of permanent magnet rotary motor - Google Patents

Description

Rotors of permanent magnet rotating electrical machines

technical field

The utility model relates to a rotor of a permanent magnet rotating electrical machine comprising a permanent magnet which has a predetermined gap on the stator and rotates relatively. the

Background technique

In the rotor of such a permanent magnet rotating electrical machine and the rotors of other rotating electrical machines, unbalance (unbalanced state of the rotating object) will inevitably occur due to the influence of variations such as material inhomogeneity and processing tolerance. This unbalance acts as a load, and during rotation, the centrifugal force in the circumferential direction of the rotor affects the rotation. Therefore, the load increases according to the rotational speed of the rotor, and becomes a factor of radial displacement. This radial displacement causes the vibration of the rotor and the rotating machine as the cause of the shaft vibration. Therefore, in the rotating machine, the balance adjustment is carried out in accordance with JIS B0905 (Rotating Machine - Balance Degree of Rigid Rotor), so that the rotor and the rotating body The level of balance determined by the size and use of the rotating body is below the allowable unbalance amount calculated by adding the mass of the rotating body, the rotating speed, and the distance to the modified surface. the

As a rotor for performing such balance adjustment, for example, a motor and a compressor have been proposed, which have a rotor core on which electromagnetic steel plates are laminated, permanent magnets arranged in a convex polygonal shape along the circumferential direction in the rotor core, and placed in a A balance adjustment hole provided on the radially outer side of the permanent magnet of the rotor core (for example, see Patent Document 1). the

In addition, there is also a proposed method of manufacturing a motor that adjusts the maximum number of rotations of the motor by changing the thickness, size, and number of end plates made of magnetic material disposed at the ends of the rotor (see, for example, Patent Document 2). the

Furthermore, a motor consisting of a rotor having a magnet embedded in a rotor core and a stator is also proposed, and a balance weight integrated end plate for balance adjustment in which a balance weight portion for balance adjustment and an end plate portion are integrated is used, and A motor in which a notch is provided in an end plate of a balance weight integrated end plate for balance adjustment (see, for example, Patent Document 3). the

Furthermore, a rotor of a motor is also proposed in which a single end plate sandwiching a laminated iron core embedded with a magnet has an integral structure formed of a resin end ring and a metal end ring, and the resin end ring Parts in contact with the metal terminal ring have stepped shapes that fit into each other (see, for example, Patent Document 4). the

Prior art literature

Patent Document 1: Japanese Patent Laid-Open No. 2008-178233

Patent Document 2: Republished Patent No. WO02/019499

Patent Document 3: Japanese Patent Laid-Open No. 2004-336925

Patent Document 4: Japanese Patent Laid-Open No. 2004-222348

Contents of the invention

However, in the conventional example described in Patent Document 1, since the balance adjustment hole needs to be provided directly on the rotor core, it is difficult to provide the balance adjustment hole at the desired position when the distance between the permanent magnet and the outer diameter of the rotor core is narrow. Adjustment hole. In addition, it is necessary to use tools such as drills, and there is a possibility that excavation dust and the like may enter between the magnet insertion holes of the rotor and the laminated rotor cores, causing problems in terms of quality. Furthermore, even if a balance adjustment hole is provided in an area with little magnetic flux, there is an unsolved problem such as a decrease in efficiency due to deviation of the flow of magnetic flux in the adjustment hole or space with respect to the axial and radial directions. the

In addition, in the conventional example described in the above-mentioned Patent Document 2, the maximum rotation speed of the motor is adjusted by changing the thickness of the balance weight for balance adjustment, but the ends of the balance weight for balance adjustment, the rotor core, and the axial restraint of the permanent magnet The plates are integrally formed by riveted pins. Therefore, it is necessary to perform balance adjustment before the process of integrating riveting pins, that is, to determine the size of the balance weights for balance adjustment and the number of balance weights for balance adjustment. If the specified unbalance amount is exceeded after riveting, it is difficult to reset the balance. Adjust to become below the specified unbalance amount. In addition, the rotor core needs a caulking pin hole through which the caulking pin passes. Compared with the case where there is no caulking pin hole, even if the caulking pin hole is provided at a position that has less influence on the flow of magnetic flux, there is an influence of a decrease in efficiency, etc. Such unresolved issues. the

In addition, in the conventional example described in Patent Document 3, it is necessary to perform balance adjustment before the process of integrating the rotor fixed by rivets, the end plate, and the balance weight for balance adjustment. In some cases, it is difficult to readjust to become below the specified unbalance amount. In addition, the rotor core needs rivet holes through which the rivets pass. Compared with the case without rivets, even if the rivet holes are provided at positions that do not affect the flow of magnetic flux, there are unresolved problems such as the influence of a drop in efficiency. the

In addition, in the conventional example described in Patent Document 4, the weight of the rotor is reduced by using a resin ring, and the balance adjustment is performed by grinding the metal part, but the metal part needs to be ground for balance adjustment, and the grinding powder has There is an unresolved problem that the rotor cores that may get into the laminated layers cause problems in quality. the

Therefore, the present invention is made focusing on solving the unsolved problems in the above-mentioned conventional examples, and its object is to provide a cutting process that does not generate cutting chips such as excavation powder and grinding powder, and can accurately perform a balance. Adjusted rotor of a permanent magnet rotating electrical machine

In order to achieve the above object, the rotor of the permanent magnet rotating electric machine according to the first aspect of the present invention is characterized in that it includes: a rotor core holding a permanent magnet; A gimbal ring capable of riveting and fixing a plurality of protrusions of a balance weight for balance adjustment. the

In addition, the rotor of a permanent magnet rotating electric machine according to a second aspect of the present invention is characterized in that the balance ring is made of any one of aluminum, aluminum alloy, aluminum casting, and aluminum alloy casting. the

Furthermore, the rotor of the permanent magnet rotating electric machine according to the third aspect of the present invention is characterized in that the balance ring is made of cast iron. the

Invention effect

According to the utility model, since the balance ring installed on at least one axial end of the rotor core is formed with a plurality of protrusions capable of riveting and fixing the balance weight for balance adjustment, so when the balance ring and the rotor core are installed on In the state on the rotating shaft, at least by installing a balance weight for balance adjustment on the protrusion of the gimbal ring or cutting the protrusion itself, it is possible to obtain cutting chips such as excavation powder and grinding powder, and can be easily removed in a short time. Make balance adjustments for such an effect. the

Description of drawings

FIG. 1 is a cross-sectional view showing a permanent magnet rotating electrical machine according to an embodiment of the present invention. the

Fig. 2 is a perspective view showing the rotor of Fig. 1 . the

Fig. 3 is a perspective view of a state where the balance ring of Fig. 2 is removed. the

FIG. 4 is a view taken in the direction of P in FIG. 3 . the

Fig. 5 is a perspective view of a gimbal applicable to the present invention. the

FIG. 6 is an exploded perspective view of the gimbal of FIG. 5 . the

FIG. 7 is a front view of the gimbal of FIG. 5 . the

Fig. 8 is a perspective view showing a conventional example. the

Fig. 9 is a perspective view showing an end plate applicable to a conventional example. the

FIG. 10 is a front view of the end plate of FIG. 9 . the

Symbol Description

1…Permanent magnet synchronous motor

2…cylindrical frame

3…Stator

4…Rotor

5…rotation axis

5a, 5b... Bearing mounting part

6...Stator core

7…Gap

8…excitation coil

12...Magnetic poles

13...rotor core

14...Magnet insertion hole

15…Permanent magnet

16...Balance ring

17...Central hole

18...circular plate

19... bushing

20…raised

21...Balance weight for balance adjustment

Detailed ways

Below, embodiment of the present utility model is described according to accompanying drawing. the

FIG. 1 is a cross-sectional view showing a permanent magnet synchronous motor as a permanent magnet rotating electric machine according to an embodiment of the present invention. the

In FIG. 1 , a permanent magnet synchronous motor 1 has an interior permanent magnet (IPM: Interior Permanent Magnet) structure. the

This permanent magnet synchronous motor 1 has a cylindrical frame 2, a stator 3 is arranged on the inner peripheral side of the cylindrical frame 2, and a rotor 4 is arranged facing the inner peripheral side of the stator 3 with a predetermined gap therebetween. The rotor 4 is mounted on a rotating shaft 5 . the

The stator 3 has a stator core 6 in which stator core plates punched out of high-permeability electrical steel sheets are stacked in the axial direction, and a slit 7 extending in the axial direction on the inner peripheral surface side is formed on the stator core 6 , and the exciting coil 8 is wound in the gap 7 . Here, as the winding method of the exciting coil 8 , either concentrated winding or distributed winding may be used. the

On the other hand, as shown in FIG. 2 , the rotor 4 includes a rotor core 13 including, for example, six magnetic poles 12 , in which rotor core plates punched from high-permeability magnetic steel sheets are laminated in the axial direction. The rotor core 13 includes: a plurality of, for example, six magnet insertion holes 14 penetrating in the axial direction; The inserted permanent magnet 15. Here, the permanent magnet 15 is composed of a rare earth magnet. the

Moreover, as shown in FIG. 2 , the rotor 4 is firmly fixed with balance rings 16 on both end faces of the rotor core 13 in the rotating shaft 5 in the axial direction by means of shrink fitting or press-fitting, so that the circumferential direction does not occur. rotation and axial movement. The balance ring 16 has a doughnut-shaped disc 18 made of aluminum or an aluminum alloy, on which a central hole 17 having a circular cross section is formed, through which the rotating shaft 5 is inserted. the

The circular plate 18 has a contact surface with the rotor core 13, and in the central hole 17, from the rotor core 13 side or the protrusion 20 side, as shown in FIGS. 4 and 5, an iron circular plate is fixed. Annular bushing 19 . In addition, on the circumference passing through the substantially central portion between the bushing 19 and the outer peripheral edge of the circular plate 18 , for example, 12 projections 20 protrude to the opposite side of the rotor core 13 at equal intervals and are integrally formed. The protrusion 20 is formed so that the balance weight 21 for balance adjustment can be caulked and fixed, and it can be easily cut with a sheet metal tool such as wire shears without using special cutting processing to generate cutting chips such as excavation powder and grinding powder. the

Here, the disc 18 and the bushing 19 are molded by die-casting aluminum or an aluminum alloy with the bushing 19 installed in a die-casting mold so that the bushing 19 is embedded in the disc 18 . the

The balance weight 21 for balance adjustment, as shown in FIG. the

Next, the operation of the above-described embodiment will be described. the

To assemble the rotor 4, first, as shown in FIG. 3, the rotor core 13 composed of electromagnetic steel sheets laminated on the rotating shaft 5 is installed, and after that, or before, the permanent magnets are inserted into the magnet insertion through-holes 14 of the rotor core 13. 15. the

Then, at both ends in the axial direction of the rotor core 13 in the rotating shaft 5, in the state where the flat surface of the balance ring 16 is brought into contact with the axial end surface of the rotor core 13, the rotation in the circumferential direction and the movement in the axial direction cannot be performed. In this way, the balance ring 16 is firmly fixed, and the assembly of the rotor 4 is completed. the

As described above, by attaching the balance rings 16 to both ends of the rotor core 13 in the axial direction, the openings of the magnet insertion through holes 14 formed in the rotor core 13 are closed, and the permanent magnets 15 can be positioned in the axial direction. the

When the assembly of the rotor 4 is completed, the rotor 4 is installed in the balancing machine. At this time, the rotating shaft 5 is mounted on the balancing machine with the bearing mounting portions 5 a and 5 b serving as fulcrums. the

Then, the unbalance amount of the rotating body is measured by rotating the rotor 4 at a constant rotation speed in the balancing machine. Based on the measured unbalance amount, the balance is adjusted so that it becomes below the allowable value corresponding to the maximum rotation speed of the rotating machine and the mass of the rotating body in the two-sided balance shown in JIS B0905 or the like. This balance adjustment uses the following method to carry out the balance adjustment: as shown in Figure 2, the balance adjustment method that the balance weight 21 is installed on the protrusion 20 for balance adjustment and then riveted and fixed; A balance adjustment method; or a balance adjustment method in which both installation of the balance weight 21 for balance adjustment and cutting of the projection 20 are performed. the

Thus, according to the above-mentioned embodiment, since the balance adjustment is performed using the protrusions 20 of the balance ring 16 in which the plurality of protrusions 20 are provided at equal intervals in the circumferential direction, the balance adjustment operation can be easily performed in a short time. Furthermore, since the balance adjustment can be performed when the assembly of the rotor 4 is completed, accurate balance adjustment can be performed. the

Moreover, because the balance adjustment method can be selected: the balance adjustment method of riveting and fixing the balance weight 21 on the protrusion 20 for balance adjustment; the balance adjustment method of cutting off the protrusion 20 at the desired position; and the installation of the balance weight 21 Since both the balance adjustment method and the cutting of the protrusion 20 are performed, fine balance adjustment can be performed. the

In addition, in the conventional example, as shown in FIGS. 6 to 8 , the balance ring 16 of this embodiment is not used, and only the end plates 31 for fixing the axial ends of the rotor core 13 are used. In this case, as shown in FIG. 7 and FIG. 8 , on the end plate 31 are formed: a groove 32 formed on the circumferential surface and a groove 33 formed on the end surface which are roughly standard balance adjustment positions; The screw tap 34 of balance weight is used for adjustment. Furthermore, depending on the measured unbalance amount, it is necessary to perform special machining operations such as cutting a part of the groove 32 or 33, and fixing the balance adjustment screw on the tap 34. It is difficult to determine the balance adjustment position, and there is a problem that the balance adjustment operation is time-consuming. The problem. In addition, the cleaning operation of cutting chips and the like generated by the cutting process is also time-consuming, and if the cleaning operation is not thorough, the cutting chips invade the outer peripheral part of the rotor 4 and/or the bearing mounting parts 5a, 5b, etc., and become the main cause of failure. reason. the

In order to prevent such failures, careful and accurate balance adjustment work is required. Therefore, there are problems such as unevenness in the product and unstable quality depending on the length of the work time, the operator and the machine. the

However, in the present embodiment, as described above, the balance adjustment work is performed only by caulking and fixing of the projection 20 to the balance weight 21 for balance adjustment and cutting of the projection 20. Make correct balance adjustments within time. Especially in the case of cutting the protrusions, the cut protrusions have a size that can be seen, so there is almost no need to worry about entering the outer peripheral part of the rotor 4 and the bearing mounting parts 5a, 5b, etc. It is also easy to find out and remove it if it invades into it, so the quality will not be lowered due to the accumulation of grinding debris like the aforementioned prior art. the

In addition, in the above-mentioned embodiment, the case where the balance rings 16 are respectively attached to the both axial end sides of the rotor core 13 on the rotating shaft 5 has been described, but the present invention is not limited thereto, and the rotor core 13 may be A balance ring 16 is installed on any one, and an end plate without balance adjustment is installed on the other. the

In addition, in the above-mentioned embodiment, the case where the balance ring 16 is formed by die-casting aluminum or an aluminum alloy has been described, but the present invention is not limited to this, and the disc 18 may be formed by cutting aluminum or an aluminum alloy. Projection fitting holes are formed in the circular plate 18 , and the projections 20 are fitted into the projection fitting holes to form the balance ring 16 . Furthermore, cast iron may be cast to form the balance ring 16 . In this case, the bushing 19 can also be omitted. the

In addition, in the above-mentioned embodiment, the case where the central hole of the disc 18 and the inner peripheral surface of the bushing 19 are circular has been described, but the present invention is not limited thereto. When the shape is any shape such as a double-sided linear shape (two-sided shape), a square shape, and an elliptical shape that prevents rotation in the circumferential direction, it can be formed into a shape that matches these. the

In addition, in the above-mentioned embodiment, the case where the number of magnetic poles of the rotor 4 is six has been described, but the present invention is not limited thereto, and any number of magnetic poles can be set. the

In addition, in the above-mentioned embodiment, the case where one permanent magnet 15 forms one magnetic pole has been described, but the present invention is not limited thereto, and the permanent magnets may be arranged in a V-shape or a U-shape, or the like. the

In addition, in the above-mentioned embodiment, the case where the rotor 4 has a built-in magnet structure has been described, but the present invention is not limited to this, and a surface magnet structure in which permanent magnets are arranged on the outer peripheral surface may also be employed. the

In addition, in the above-mentioned embodiments, the case where the permanent magnet synchronous motor is applied as the permanent magnet rotating electrical machine has been described, but the invention is not limited to this, and the present invention can also be applied to other types of permanent magnet rotating electrical machines. the

Claims (3)

1. the rotor of a permanent magnet type electric rotary machine is characterized in that, comprising:

The rotor core that keeps permanent magnet; With at least one the axial end that is installed on this rotor core, have and the riveted and fixed balance to adjust gimbal with a plurality of convexities of balance weight.

2. the rotor of permanent magnet type electric rotary machine as claimed in claim 1 is characterized in that:

Said gimbal is made up of in aluminium, aluminium alloy, aluminum casting spare and the aluminium alloy casting spare any one.

3. the rotor of permanent magnet type electric rotary machine as claimed in claim 1 is characterized in that:

Said gimbal is made up of cast iron.

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