JPWO2017212867A1 - Rotating electric machine - Google Patents

Abstract

The permanent magnet housing hole formed in the rotor core and the permanent magnet to be inserted are fixed by the interposition member, and the interposition member prevents the rotor core permanent magnet housing hole from flowing out and rotates from the magnet. By reducing the thermal resistance to the core, the temperature rise of the permanent magnet is suppressed. A rotating electrical machine including a rotor and a stator, wherein the rotor includes a rotating shaft, a permanent magnet, a rotor core that forms a housing for housing the permanent magnet, and the housing for storing the permanent magnet. And an interposition member having a fixing surface on the permanent magnet side and a shearing surface on the inner surface side of the storage portion, and the permanent magnet rotates on the one surface that does not fix the interposition member. It is in contact with the child core.

Description

  The present invention relates to a rotating electrical machine in which a permanent magnet is fixed to a rotor core with an interposed member.

  In a rotating electrical machine composed of a rotor and a stator, the stator is composed of a stator core in which a plurality of slots are formed, and a coil wound around a tooth provided between the slots.

  The rotor is composed of a rotor core in which a plurality of electromagnetic steel plates are stacked, a permanent magnet having magnetic force, and a shaft that serves as a rotating shaft. As for the type of rotor, a magnet-embedded rotor in which a plurality of permanent magnets are embedded in an iron core having a permanent magnet housing hole is well known.

  A magnetic field is generated by passing a current through the coil. Based on the generated magnetic field, a flow of magnetic flux is formed between the rotor and the stator, so that the rotor obtains a rotational force.

  In the magnet-embedded rotor, the dimensions of the plurality of permanent magnet housing holes formed in the rotor iron core are set larger than the outer dimensions of the permanent magnet, and the permanent magnet housing hole and the permanent magnet are fixed. This is done through an adhesive filled in the gap between the permanent magnet and the permanent magnet housing hole. In addition to providing an adhesive for fixing the permanent magnet and the permanent magnet storage hole, there is also known a permanent magnet fixing method in which a space between the permanent magnet and the permanent magnet storage hole is filled with mold resin. Hereinafter, the member that fixes the permanent magnet and the permanent magnet housing hole is referred to as an interposed member.

  It is well known that a thermosetting resin or the like having excellent heat resistance is used for the interposition member because the permanent magnet becomes hot during operation of the rotating electrical machine.

  The step of fixing the permanent magnet to the permanent magnet housing hole of the rotor core with the interposition member such as the thermosetting resin is inserted into the permanent magnet housing hole of the rotor core or the permanent magnet, the thermosetting resin, or the like. After filling, the thermosetting resin or the like is cured and fixed by heating.

  As the property of the thermosetting resin, when heated, the viscosity decreases at a predetermined temperature. For this reason, the thermosetting resin having a reduced viscosity flows through the gap between the laminated magnetic steel sheets in the radial direction and flows out of the rotor. As a result, the thermosetting resin that has flowed out of the rotor is cured while attached to the outer shape of the rotor.

  The rotor whose outer shape has become larger due to the fixing of the thermosetting resin interferes with parts set in the vicinity of the rotor during operation of the rotating electrical machine, and the operation is stopped due to breakage.

  In Patent Document 1, an adhesive, which is an interposed member, is directly coated on a permanent magnet in advance (hereinafter referred to as a coating magnet), and the coated magnet is inserted into a permanent magnet housing hole formed in a rotor core, and then a magnet is formed. A method of fixing a permanent magnet by curing an intervening member coated on is disclosed.

  On the other hand, in Patent Document 2, a coating layer of a resin molded body, which is an interposed member, is formed on the outer periphery of a permanent magnet so as to have a cross-sectional area larger than at least the cross-sectional area of the permanent magnet housing hole, and the magnet is used as a rotor. A method has been proposed in which a permanent magnet and a permanent magnet storage hole are brought into full contact with each other and fixed by being inserted into the permanent magnet storage hole of an iron core while being cut at the opening edge of the permanent magnet storage hole.

JP 2003-199303 A JP 2006-174537 A

  According to the rotor of Patent Document 1, the permanent magnet and the rotor core housing hole are used to cure the adhesive, which is an interposed member, after the coating magnet is inserted into the permanent magnet housing hole formed in the rotor core. And can be fixed. However, since the adhesive, which is an interposed member, is hardened inside the permanent magnet housing hole formed in the rotor core, it passes through the gap between the laminated magnetic steel sheets in the radial direction and flows out of the rotor. there is a possibility. As a result, the outer shape of the rotor becomes larger due to the sticking of the coating, and the rotor interferes with parts set in the vicinity of the rotor during operation of the rotating electrical machine, and the operation is stopped due to breakage.

  On the other hand, according to the rotor of Patent Document 2, since the magnet with the interposition member is inserted into the permanent magnet storage hole of the rotor core while being scraped at the opening edge of the permanent magnet storage hole, Is not likely to flow out of the rotor. However, since the coating layer of the resin molded body that is an interposed member is formed on the entire surface of the permanent magnet, the thermal resistance from the permanent magnet to the rotor core increases, and the temperature of the permanent magnet that is the heating element increases. It becomes an easy structure.

  The present invention provides a permanent magnet embedded rotor in which a plurality of permanent magnet housing holes and permanent magnets formed in a rotor core can be fixed by an interposed member, and the interposed member is an outer shape of the rotor core. It is an object of the present invention to provide a rotor structure that can suppress the temperature rise of the permanent magnet by reducing the thermal resistance from the magnet to the rotor core.

  In order to solve the above-described problems, a rotating electrical machine according to the present invention is a rotating electrical machine including a rotor and a stator, and the rotor includes a rotating shaft, a permanent magnet, and a storage unit that stores the permanent magnet. The rotor core formed, and an interposition member that fixes the permanent magnet to the storage part, and has a fixing surface on the permanent magnet side and a shear surface on the inner surface side of the storage part, and The permanent magnet is in contact with the rotor core on one side where the interposition member is not fixed.

  The rotating electric machine includes a rotor and a stator, and the rotor includes a rotating shaft, a permanent magnet, a rotor core that forms a storage unit that stores the permanent magnet, and the permanent magnet. An interposition member that is fixed to the storage portion and has a fixing surface on the inner surface side of the storage portion and a shear surface on the permanent magnet side, and the rotor iron core is not fixed to the interposition member. And in contact with the permanent magnet.

  According to the present invention, the interposed member can prevent the rotor core permanent magnet from flowing out to the outside of the rotor core permanent magnet housing hole, and can reduce the thermal resistance from the magnet to the rotor core, thereby increasing the temperature of the permanent magnet. Can be suppressed.

Radial direction sectional drawing of a rotor. The perspective view of a rotor iron core. The top view of a rotor iron core. FIG. 3 is a perspective view in which an interposition member is fixed to one surface of the permanent magnet according to the first embodiment. FIG. 3 is a top view in which an interposition member is fixed to one surface of the permanent magnet according to the first embodiment. The figure which shows the procedure which inserts the magnet with an intervention member in the rotor core of Example 1. FIG. The figure which shows the procedure which inserts the magnet with an intervention member in the rotor core of Example 1. FIG. The perspective view which fixed the intervention member to the magnet accommodation hole outer peripheral side of the rotor core of Example 2. FIG. The top view which fixed the intervention member to the magnet storage hole outer peripheral side of the rotor core of Example 2. FIG. The perspective view which fixed the intervention member to the magnet storage hole inner peripheral side of the rotor core of Example 2. FIG. The top view which fixed the interposition member to the magnet storage hole inner peripheral side of the rotor core of Example 2. FIG. The figure which shows the procedure which inserts a permanent magnet in the rotor core with an interposed member of Example 2. FIG. The figure which shows the procedure which inserts a permanent magnet in the rotor core with an interposed member of Example 2. FIG.

  First, the outline of the rotor of the rotating electrical machine of the present invention will be described with reference to FIGS. 1, 2A, and 2B.

  FIG. 1 is a cross-sectional view of a main part of a rotating electrical machine cut in a radial direction. As shown here, the rotating electrical machine includes a rotor 1 and a stator 2 provided on the outer periphery thereof. The rotor 1 has a configuration in which a permanent magnet 20 penetrating through a magnet housing hole 11 of the laminated rotor core 10 is fixed by an interposition member 30, and a shaft hole 5 into which a rotating shaft 50 is inserted at the center of the rotor core 10. Is provided. Moreover, although the permanent magnet 20 is being fixed to the rotor core 10 by the interposition member 30, the presser plate which prevents the permanent magnet 20 from scattering to the axial direction edge part of the rotor core 10 for the further reliability improvement. May be provided.

  On the other hand, the stator 2 is composed of a stator core in which a plurality of slots are formed and a coil wound around a tooth provided between the slots. When the rotor is an inner rotor, the stator 2 is disposed outside the rotor. When the rotor is an outer rotor, the rotor is disposed inside the rotor. A rotating magnetic field is formed by the magnetic flux generated by passing an electric current through the coil and the magnetic flux generated by the permanent magnet 20 of the rotor 1, generating a rotational force in the rotor 1, and external to the rotating electrical machine via an output shaft attached to the shaft hole 5. To transmit power. At this time, the permanent magnet 20 becomes a high temperature due to the eddy current loss generated when the magnetic flux caused by passing a current through the coil is linked to the permanent magnet 20.

  2A is a perspective view of the rotor core 10, and FIG. 2B is a top view thereof. The rotor core 10 is composed of a laminated steel plate formed by stacking steel plates formed with magnet housing holes 11 for housing permanent magnets 20 formed by stamping the press. For example, the steel plate is composed of an electromagnetic steel plate or an amorphous steel plate. Also good. In addition, as shown here, the dimension of the radial direction of the magnet accommodation hole 11 is set to B.

  The rotor of Example 1 is demonstrated using FIG. 3A, FIG. 3B, FIG. 4, FIG. 3A is a perspective view in which the interposition member 30 is fixed to one surface of the permanent magnet 20, and FIG. 3B is a top view thereof. Below, what the interposition member 30 fixed to the permanent magnet 20 is called the magnet 40 with an interposition member. 4 is a perspective view showing a procedure for inserting the interposed member-attached magnet 40 having the interposed member 30 fixed on the inner peripheral side surface thereof into the magnet housing hole 11, and FIG. 5 is an illustration in which the interposed member 30 is fixed to the outer peripheral side surface. FIG. 6 is a perspective view showing a procedure for inserting the magnet with attachment member 40 into the magnet housing hole 11.

  In the present embodiment, the permanent magnet 20 housed in the magnet housing hole 11 is a rare earth permanent magnet, and any kind of magnet such as a neodymium-based or samarium-based sintered magnet or ferrite magnet may be used. Moreover, the presence or absence of the surface treatment of the permanent magnet 20 does not matter. Moreover, since the permanent magnet 20 becomes high temperature at the time of driving | running | working rotary electric machine, it is necessary to make the interposed member 30 which fixes the permanent magnet 20 the material excellent in heat resistance. Therefore, it is preferable to employ a thermosetting resin having a heat resistance temperature of 100 degrees or more.

  In this embodiment, as shown in FIGS. 3A and 3B, the interposing member 30 is applied to the permanent magnet 20 and cured before being inserted into the magnet housing hole 11. Thereby, unlike patent document 1 which hardens an interposed member after insertion, an interposed member does not flow out of rotor 1 outside. The surface on which the intervention member 30 is applied is the inner peripheral side surface of the permanent magnet 20 in FIG. 4, and the inner peripheral side surface of the permanent magnet 20 in FIG. 5. In addition, the already formed intervention member 30 may be fixed to any surface of the permanent magnet 20. According to the configuration of FIG. 4, the permanent magnet 20 is in contact with the rotor core 10 on the outer peripheral side, and the heat of the permanent magnet 20 is well transmitted to the outer peripheral surface of the rotor core 10. By cooling the permanent magnet 20, the permanent magnet 20 can also be efficiently cooled, and the efficiency of the rotating electrical machine can be improved. Further, according to the configuration of FIG. 5, since the interposition member 30 provided on the outer peripheral surface of the permanent magnet 20 that is easily affected by centrifugal force also functions as a protective member, damage to the permanent magnet 20 can be prevented. it can.

  In addition, since the interposed member 30 is scraped off when inserted into the magnet housing hole 11, the hardness of the interposed member 30 must be set lower than the hardness of the rotor core 10. For example, the hardness of the intervention member 30 is preferably durometer hardness HDA 90 or less.

In addition, in order for the permanent magnet 20 to be fixed to the magnet housing hole 11 by the interposition member 30, as shown in FIGS. 2A, 2B, 3A, and 3B, the dimension in the thickness direction of the permanent magnet 20 is A. When the dimension in the thickness direction of the magnet 40 with the interposed member is C, the relationship between these and the dimension B of the magnet housing hole 11 is
A <B <C
It is necessary to satisfy.

  The procedure for inserting the interposed member-equipped magnet 40 having such dimensions into the magnet housing hole 11 will be described with reference to the perspective views of FIGS. 4 and 5.

  As shown in FIGS. 4A and 4B, when the magnet with the interposed member 40 set according to the above-described dimensions is inserted into the magnet accommodating hole 11, the interposed member 30 opens the magnet accommodating hole 11. The part edge 12 is cut by a dimension corresponding to CB to form a sheared surface, and the dimension of the magnet 40 with the interposed member is substantially equal to the dimension B of the magnet housing hole 11. Since the rotor core 10 is formed by pressing, burrs are formed in the pressing direction. In addition, since the burr | flash is formed in the opening edge 12 of the magnet accommodation hole 11 by setting the press direction of the magnet accommodation hole 11 to the opposite direction with respect to the insertion direction of a magnet, the interposed member 30 becomes easy to be scraped. .

  On the other hand, the magnet surface on the side of the anti-intervention member of the magnet with interposition member 40 comes into contact with the inner surface of the magnet housing hole of the rotor core 10 when the magnet with interposition member 40 is inserted.

  As described above, since the magnet surface is inserted into the magnet housing hole while being in contact with the inner surface of the magnet housing hole of the rotor core 10, an unnecessary amount of the interposition member 30 that is scraped by the opening edge 12 of the magnet housing hole is unnecessary. Only shaved. Therefore, the magnet 40 with the interposed member is fixed to the rotor core 10 as shown in FIG. 4 or FIG. In addition, since the permanent magnet 20 and the rotor core 10 are in contact with each other on the surface where the interposition member 30 is not fixed, the thermal resistance of the rotor core 10 from the permanent magnet 20 can be reduced, so that the temperature increase of the permanent magnet 20 is suppressed. it can.

  As described above, according to the rotating electrical machine of the present embodiment, it is possible to prevent the interposed member from flowing out of the permanent magnet housing hole and to reduce the thermal resistance from the magnet to the rotor core. The temperature rise of the permanent magnet can be suppressed.

  A rotating electric machine according to a second embodiment will be described with reference to FIGS. Description of the same items as those in the first embodiment is omitted. 6 is a perspective view (FIG. 6A) and a top view (FIG. 6B) in which the interposition member 130 is fixed to the outer peripheral side wall surface of the magnet storage hole 111, and FIG. 7 is an interposition on the inner peripheral side wall surface of the magnet storage hole 111. It is the perspective view (FIG. 7A) which fixed the member 130, and a top view (FIG. 7B). Below, what the interposition member 130 adhered to the side wall of the magnet accommodation hole 111 is called the magnet accommodation hole 110 with an interposition member.

  Before inserting the permanent magnet 20 into the magnet housing hole 111, the interposition member 130 is applied to the side wall of the magnet housing hole 111 and cured. The surface on which the interposition member 130 is applied to the side wall of the magnet storage hole 111 is the inner peripheral side wall surface of the magnet storage hole 111 in FIG. 13 and the outer peripheral side wall surface of the magnet storage hole 111 in FIG. Further, the already formed intervention member 130 may be fixed to any side wall of the magnet housing hole 111. Since the interposed member 130 is scraped off by inserting the permanent magnet 20, the hardness of the interposed member 130 must be set lower than the hardness of the permanent magnet 20. For example, durometer hardness HDA90 or less is preferable.

In addition, in order for the permanent magnet 20 to be fixed to the magnet housing hole 111 by the interposition member 130, as shown in FIG. 11 or FIG. When the dimension of the magnet housing hole 110 is E, the relationship between these and the dimension A in the thickness direction of the permanent magnet 20 is
E <A <D
It is necessary to satisfy.

  8 and 9 are diagrams showing a procedure for inserting the permanent magnet 20 into the magnet housing hole 110 with the interposed member.

  When the permanent magnet 20 is inserted into the magnet housing hole 110 with the interposed member set according to the above dimensions, the interposed member 130 is shaved by the permanent magnet edge 21 by a dimension corresponding to AE, and a shear surface is formed. The dimension of the magnet housing hole 110 with the interposed member is substantially equal to the dimension A of the permanent magnet 20.

  On the other hand, the surface of the surface of the magnet housing hole 110 with the interposed member to which the interposed member is fixed comes into contact with the permanent magnet 20 when the permanent magnet 20 is inserted.

  As described above, since the permanent magnet 20 is inserted into the magnet housing hole 111 while being in contact with the inner wall of the magnet housing hole without the interposition member 130 of the rotor core 10, the magnet housing hole cut by the permanent magnet edge 21. Only an unnecessary amount of the interposed member 130 is removed. Accordingly, the permanent magnet 20 is fixed to the rotor core 10. In addition, since the permanent magnet 20 and the rotor core 10 are in contact with each other on the surface where the interposition member 130 is not fixed, the thermal resistance of the rotor from the permanent magnet 20 can be reduced, so that the temperature rise of the permanent magnet 20 can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Rotor 2 ... Stator 5 ... Shaft hole,
10 ... Rotor core,
11 ... Magnet housing hole 12 ... Opening edge,
20 ... Permanent magnet,
21 ... Permanent magnet edge,
30: Intervening member,
40: Magnet with intervening member,
50 ... Rotating shaft 110 ... Magnet housing hole with interposition member,
111 ... Magnet housing hole,
130 ... intervention member,

Claims (5)

A rotating electric machine comprising a rotor and a stator,
The rotor is
A rotation axis;
With permanent magnets,
A rotor core formed with a storage portion for storing the permanent magnet;
While fixing the permanent magnet to the storage portion, an interposition member having a fixing surface on the permanent magnet side and a shear surface on the inner surface side of the storage portion,
It has
The rotating electric machine according to claim 1, wherein the permanent magnet is in contact with the rotor core on one surface to which the interposition member is not fixed. A rotating electric machine comprising a rotor and a stator,
The rotor is
A rotation axis;
With permanent magnets,
A rotor core formed with a storage portion for storing the permanent magnet;
While fixing the permanent magnet to the storage unit, an interposition member having a fixing surface on the inner surface side of the storage unit and a shear surface on the permanent magnet side,
It has
The rotating electric machine is characterized in that the rotor iron core is in contact with the permanent magnet on one surface to which the interposition member is not fixed. In the rotating electrical machine according to claim 1 or 2,
The rotating electrical machine, wherein the interposition member is disposed on an inner peripheral side surface of the permanent magnet. In the rotating electrical machine according to claim 1 or 2,
The rotating electrical machine, wherein the interposition member is disposed on an outer peripheral side surface of the permanent magnet. In the rotating electrical machine according to claim 1 or 2,
The thermal resistance between the permanent magnet and the rotor core is
A rotating electrical machine characterized by being high on a surface provided with the interposition member and low on a surface not provided with the interposition member.

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