JP2009273240A - Rotor for ipm motor and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for an IPM motor capable of completely sealing a gap between a slot for a magnet formed at the rotor and a permanent magnet, and achieving excellent motor performance (torque performance, rotation performance and motor efficiency), and to provide a method of manufacturing the same. <P>SOLUTION: The method is provided for manufacturing the rotor for the IPM motor in which the permanent magnet 2 is inserted into the slot 13 for a magnet inside a rotor core 10. The permanent magnet 2 with dimension smaller than the slot 13 is inserted into the slot 13 for magnet, magnetic material 4 is filled between the permanent magnet 2 and an inner side surface 13b on a rotor central side of the slot 13, and the permanent magnet 2 is brought into close contact with an inner surface 13a of the slot 13 on a stator side, thus completely closing an air gap between the slot 13 and the permanent magnet 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor for an IPM motor and a method for manufacturing the same, and more particularly, an IPM motor rotor in which an air gap that can be formed between a permanent magnet inserted into a rotor slot and the slot is effectively eliminated. It relates to a method for manufacturing this.

  A magnet-embedded motor (hereinafter referred to as an IPM motor) in which a permanent magnet is embedded in a rotor can obtain a reluctance torque in addition to a magnet torque caused by the attractive force / repulsive force of a coil and a permanent magnet. Compared to a surface magnet type motor (SPM motor) in which a magnet is attached to the outer peripheral surface of the rotor, the torque is high and the efficiency is high. Therefore, this IPM motor is used for a drive motor of a hybrid vehicle, an electric vehicle and the like that require high output performance. As the permanent magnet, a sintered magnet such as a rare earth magnet, a ferrite magnet, or an alnico magnet is generally used.

  In the above-described IPM motor, in order to prevent the permanent magnet from being smoothly inserted into the magnet slot formed in the rotor core and the permanent magnet from being damaged at the slot edge, the size of the slot is set to be larger than that of the permanent magnet. A method is generally used in which a permanent magnet is fixed by setting a large dimension, filling a resin of a nonmagnetic material into a resin filling slot on the side surface of the magnet slot, and curing the resin.

  However, because the size of the slot is larger than that of the permanent magnet, even if the side surface of the permanent magnet can be fixed with the resin of the non-magnetic material, the gap between the permanent magnet and the stator side surface of the slot or the rotor central side surface In this case, a gap is easily formed. If there is a gap, that is, an air gap, in the slot, this becomes a magnetic resistance, and the flow of magnetic flux in the rotor is obstructed, resulting in a decrease in motor efficiency and a decrease in output torque.

  In addition, regarding a conventional rotor for an IPM motor, a permanent magnet having a smaller dimension than that is inserted into a magnet slot, a spring insertion groove is provided on the rotor center side of the slot, and a spring is fixed thereto. Patent Documents 1 and 2 disclose techniques for pressing the permanent magnet against the stator side surface of the slot.

  According to these rotor configurations, the gap between the permanent magnet and the stator side surface of the slot is eliminated, but there is still a gap between the permanent magnet and the rotor central side surface of the slot. The problem of magnetic resistance caused by the gap (air gap) and a decrease in output torque caused by this still remains.

JP 2000-175388 A JP 2000-341920 A

  The present invention has been made in view of the above-described problems, and can completely close a gap between a magnet slot formed on a rotor and a permanent magnet, thereby providing motor performance (torque performance, rotational performance, motor efficiency). An object of the present invention is to provide a rotor that constitutes an excellent IPM motor and a method for manufacturing the rotor.

  In order to achieve the above object, according to the method of manufacturing a rotor for an IPM motor according to the present invention, a permanent magnet having a smaller dimension than the slot is inserted into a magnet slot, and the permanent magnet and the inner surface of the slot on the center side of the rotor are inserted. A magnetic material is filled in between.

  The manufacturing method of the present invention inserts a permanent magnet into a slot of a rotor having a slot for a magnet having a size larger than that of the permanent magnet as in the conventional structure, and in particular, between the permanent magnet and the inner surface of the slot on the stator side. And a magnetic material to completely close an air gap that can be formed between the inner surface of the rotor central side (shaft side). By filling this magnetic material, the inner surface of the slot on the stator side and the permanent magnet are in close contact with each other, and a hardened body of magnetic material is formed between the permanent magnet and the inner surface of the slot on the rotor central side. The air gap is completely eliminated (closed). Further, by filling the magnetic material, the magnetic resistance of the filling portion becomes small, and a factor that obstructs the flow of magnetic flux from the stator teeth through the rotor and permanent magnet is effectively eliminated.

  Here, regarding the dimension between the stator side of the slot and the rotor center side (generally, the short side dimension) and the dimension perpendicular to it (generally the long side dimension), at least the short side dimension of the permanent magnet is larger than the short side dimension of the slot. The dimensional relationship between both the small-sized form and the form in which the long-side dimension is smaller than the long-side dimension of the slot in addition to the short-side dimension of the permanent magnet is an object. In addition, the resin filling slot as described above is formed in a continuous manner at the end of the long side dimension of the magnet insertion slot.

  The magnetic material filled in the air gap between the permanent magnet and the inner surface of the rotor central side is not particularly limited. For example, a dust core for forming a stator core, a rotor core, and a reactor core, a high-density pressure Magnetic powder for magnetic core (HDMC), magnetic resin material, etc. can be used. Examples of magnetic powder include iron, iron-silicon alloy, iron-nitrogen alloy, iron-nickel alloy, iron-carbon alloy, iron-boron alloy, iron-cobalt alloy, iron-phosphorus alloy, Examples thereof include a soft magnetic metal powder such as an iron-nickel-cobalt alloy and an iron-aluminum-silicon alloy, or a magnetic powder in which a soft magnetic metal oxide powder is coated with a resin binder such as a silicone resin.

  Further, the rotor core is formed of a steel plate laminate formed by laminating electromagnetic steel plates or the like, and a dust core, and a magnet insertion slot is formed in the rotor core by a predetermined number of magnetic poles. There is a form in which one horizontally long rectangular slot is arranged on one magnetic pole, and a form in which two horizontally long rectangular slots are arranged in a V shape on one magnetic pole.

  Furthermore, as an example of a permanent magnet, a ternary neodymium magnet in which iron and boron are added to neodymium, a samarium cobalt magnet made of a binary alloy of samarium and cobalt, and a ferrite magnet mainly composed of iron oxide powder Alnico magnets made from aluminum, nickel, cobalt, etc. can be mentioned.

  For example, a permanent magnet is inserted into a slot of a rotor core placed in a molding die and the die is closed, and a thermosetting or thermoplastic magnetic resin material is injection molded, or the magnetic powder is formed between the permanent magnet and the slot. The magnetic material is filled by a method such as filling in between and pressure forming.

  According to the manufacturing method of the present invention described above, the slot and the permanent magnet can be effectively obtained by a simple method in which the magnetic material is filled and cured between the permanent magnet inserted into the slot and the inner surface of the slot on the rotor central side. The rotor for an IPM motor with excellent motor performance can be manufactured.

  In another embodiment of the method for manufacturing a rotor for an IPM motor according to the present invention, the slot is formed of a first slot on the stator side and a second slot on the rotor center side, and the first slot And a partition member that is formed integrally with the rotor and that defines the second slot, and the permanent magnet is inserted into the first slot to deform the partition member toward the second slot. Then, the magnetic material is filled in the second slot.

  In the present embodiment, the slot for inserting a magnet is formed of two parts, that is, a first slot and a second slot on the stator side, and both slots are defined by a partition member made of a rotor core material. The short side dimension of the first slot is smaller than that of the permanent magnet, and when the permanent magnet is inserted into the first slot, the partition member is pushed out to the second slot side. In this attitude, the second slot is filled with a magnetic material.

  When the permanent magnet is inserted into the first slot having a smaller size than the permanent magnet, the inner surface on the stator side of the first slot and the inner surface on the rotor central side and the permanent magnet are in close contact with each other without a gap. Next, the second slot is filled with a magnetic material and hardened, whereby the second slot is filled with the magnetic material, and the air gap in the first and second slots is completely closed.

  For example, when a rotor core is formed from a laminate of electromagnetic steel sheets, the first slot is cut, and the second slot is cut at intervals to form a partition material between them. Thus, the first slot opening and the second slot opening are formed. By laminating a predetermined number of the steel plates, the above-described openings are laminated by the number of the steel plates to form the first slot and the second slot.

  In the present embodiment, when the permanent magnet is inserted into the first slot, the partition material can be easily deformed toward the second slot, and the thickness and length are such that the partition material is not damaged in the deformed posture. It is preferable that the partition material is formed. Since the partition member has rigidity or flexibility that can be easily deformed toward the second slot, the insertion efficiency of the permanent magnet can be ensured, and damage during insertion can be avoided.

  In another embodiment of the method for manufacturing a rotor for an IPM motor according to the present invention, the slot is formed of a first slot on the stator side and a second slot on the rotor center side, and the first slot A partition member is provided which defines a second slot and is integrally formed with the rotor, and the permanent magnet having a smaller dimension than the first slot is inserted into the first slot, The partition material is pressed against the stator side by filling the magnetic material in the second slot, thereby bringing the permanent magnet and the partition material into close contact with each other.

  In this embodiment, the slot is formed of two first and second slots as in the above-described embodiment, but the size of the permanent magnet is larger than the size of the first slot on the stator side. Therefore, when the permanent magnet is inserted into the first slot, the permanent magnet does not push the partition material toward the second slot.

  Instead, after inserting a small-sized permanent magnet into the first slot and then pressurizing and filling the magnetic material into the second slot, the central part of the partition member is deformed to the stator side, for example. The permanent magnet is brought into close contact with the permanent magnet and pushed into the inner surface of the first slot on the stator side.

  In the state in which the permanent magnet is pushed into the inner surface of the first slot on the stator side by the partition member, the air gap between the first slot and the permanent magnet is eliminated, and at the same time, in the second slot. The magnetic material is pressurized and filled, and when it is hardened, the air gap inside is also eliminated.

  In another embodiment of the method for manufacturing a rotor for an IPM motor according to the present invention, a fixed body made of a magnetic material is inserted between the permanent magnet and the inner surface of the slot on the rotor central side. A magnetic material is filled between the inner surface of the slot on the rotor central side.

  In this embodiment, a permanent magnet is inserted into one slot, and a fixed body made of a magnetic material is first inserted into the gap between the permanent magnet and the rotor central side. Finally, the fixed body and the slot on the rotor central side are finally inserted. By pressurizing and filling the magnetic material between the inner side surfaces, the applied pressure is uniformly transmitted to the permanent magnets through the fixed body, and the permanent magnets are pressed against the inner surface of the slot on the stator side by the equal applied pressure. Is.

  In addition, the rotor for an IPM motor according to the present invention includes a magnet slot, a permanent magnet having a smaller size than the slot, a permanent magnet and an inner surface of the slot on the center side of the rotor. And a magnetic body in which a magnetic material is filled and cured therebetween.

  In addition, a fixed material previously formed of a magnetic material is inserted between the permanent magnet and the inner surface of the slot on the rotor central side, and the magnetic material is inserted between the fixed material and the inner surface of the slot on the rotor central side. It may be a rotor that is filled and cured. That is, in the rotor of this form, a hardened body made of a permanent magnet and two layers of magnetic material is interposed in the slot.

  In another embodiment of the rotor for an IPM motor according to the present invention, the slot is formed of a first slot on the stator side and a second slot on the rotor center side. And a partition member formed integrally with the rotor, the permanent magnet is fixed in the first slot, and the magnetic material is filled and cured in the second slot. A magnetic body is provided, and the partition material is in close contact with the permanent magnet.

  Here, as a measure for forming a rotor in which the partition material is in close contact with the permanent magnet, one of them is that the size of the permanent magnet is made larger than that of the first slot, and this is used as the first slot. There is a method of filling the second slot with a magnetic material after being inserted into the slot. In the rotor produced by this manufacturing method, the partition material is curved toward the stator, and the partition material maintains the posture in which the permanent magnet is pressed toward the stator. As another method, the size of the permanent magnet is made smaller than that of the first slot, and after inserting the permanent magnet into the first slot, the second slot is pressurized and filled with a magnetic material. There is a method in which the material is deformed to the first slot side, and the permanent magnet is brought into close contact with the inner surface of the first slot on the stator side by the partition material.

  The rotor for an IPM motor of the present invention described above is excellent in torque performance, rotational performance, and motor efficiency because there is no air gap that provides high magnetic resistance between the inner surface of the permanent magnet insertion slot and the permanent magnet. It becomes the rotor which comprises an IPM motor. Therefore, the production of the IPM motor having this rotor has recently been expanded, and it is suitable for a hybrid vehicle or an electric vehicle in which mounting of a high-performance drive motor is an urgent issue.

  As can be understood from the above description, according to the method for manufacturing a rotor for an IPM motor of the present invention, the gap between the magnet slot formed in the rotor and the permanent magnet can be completely closed, so that the motor performance (torque performance) can be obtained. , A rotor constituting an IPM motor excellent in rotational performance and motor efficiency) can be manufactured.

  Embodiments of the present invention will be described below with reference to the drawings. In the illustrated rotor, two permanent magnets are arranged in a V shape to form one magnetic pole, but one permanent magnet facing the teeth forms one magnetic pole. Of course there may be.

  FIG. 1 is a plan view showing an embodiment of a rotor for an IPM motor according to the present invention. FIG. 2 is a plan view of the rotor of FIG. It is the flowchart explaining the manufacturing method.

  The illustrated rotor core 10 for an IPM motor is formed of a steel plate laminate in which electromagnetic steel plates are laminated, or a dust core, and is permanently installed in a magnet insertion slot 13 formed according to a predetermined number of magnetic poles. The magnet 2 is inserted and fixed. More specifically, the plan view per one pole is formed in each of the slots 13 and 13 formed in a substantially V shape (two rectangles have a substantially V shape spaced apart) in plan view per pole. Rectangular permanent magnets 2 and 2 are arranged to form a V-shaped permanent magnet, which has a predetermined number of poles extending in the circumferential direction.

  On the side of the magnet insertion slot 13, there is a shape for suppressing the magnetic flux flowing from the stator teeth (not shown) from the side of the permanent magnet to the rotor core side, and the permanent magnet is placed inside the magnet insertion slot 13. The resin-filling slots 14 and 14 are filled with a non-magnetic resin material for fixing the magnet. After the permanent magnet 2 is inserted into the magnet-inserting slot 13, the resin-filling slot 14 is non-magnetic. The resin material is filled, and the permanent magnet 2 is fixed in the slot 13 by being cured.

  A rotor central groove 12 for shaft insertion is formed at the center of the rotor core 10, and a plurality of hollow portions in the stator core (not shown), that is, a plurality of protrusions projecting radially inward from a substantially annular yoke in plan view. The illustrated rotor core 10 is disposed in a hollow portion formed by teeth in a posture in which a predetermined gap is formed between the tip of the teeth and the stator side surface 11 of the rotor core 10 to form an IPM motor. is there.

  The permanent magnet 2 inserted and fixed in the magnet insertion slot 13 includes a ternary neodymium magnet obtained by adding iron and boron to neodymium, a samarium cobalt magnet made of a binary alloy of samarium and cobalt, and iron oxide. Examples thereof include ferrite magnets made from powdered materials as main raw materials, and alnico magnets made from aluminum, nickel, cobalt and the like as raw materials.

  Next, an embodiment of a method of manufacturing the rotor shown in FIG. 1, more specifically an embodiment of a method of fixing the permanent magnet 2 in the slot of the rotor core 10, will be outlined based on FIG. 2.

  As shown in FIG. 2 a, in this manufacturing method, the slot 13 having a relatively large dimension (short side dimension) from the stator inner side surface 13 a to the rotor central side inner surface 13 b of the magnet insertion slot 13 is formed in the rotor core 10. As shown in FIG. 2 b, the permanent magnet 2 having a smaller dimension than that of the slot 13 is inserted into the slot 13.

  When the permanent magnet 2 is inserted into the slot 13, the magnetic material 4 is filled between the permanent magnet 2 and the inner surface 13 b of the slot 13 on the rotor central side.

  As this magnetic material 4, iron, iron-silicon alloy, iron-nitrogen alloy, iron-nickel alloy, iron-carbon alloy, iron-boron alloy, iron-cobalt alloy, iron-phosphorus alloy, Soft magnetic metal powders such as iron-nickel-cobalt alloys and iron-aluminum-silicon alloys, or magnetic powders in which soft magnetic metal oxide powders are coated with a resin binder, and thermosetting or thermoplastic magnetic resin materials Etc. can be used.

  The method of filling the magnetic material 4 includes a method of placing the rotor core 10 in a cavity of a mold (not shown) and injection molding the magnetic resin material therein, or a method of pressure molding by filling the cavity with magnetic powder. Etc. It is preferable to insert a temporary closure so that the magnetic material is not filled into the resin filling slot 14 and to remove the temporary closure after the magnetic material is filled.

  After the magnetic material 4 is filled and cured, the non-magnetic resin material 3 is filled and cured in the resin filling slot 14, and the permanent magnet 2 is fixed as shown in FIG. 2b, and the rotor as shown in FIG. 1 is manufactured. The

  As shown in FIGS. 1 and 2b, the stator side surface of the permanent magnet 2 is in close contact with the inner side surface 13a of the slot 13 on the stator side, and between the permanent magnet 2 and the inner side surface 13b of the slot 13 on the rotor central side. The magnetic material 4 is filled and hardened, and the nonmagnetic resin material 3 is filled and hardened on both sides of the permanent magnet 2 without any gaps. Therefore, the air gap in the slot 13 is completely eliminated.

  FIG. 3 is a flowchart illustrating another embodiment of a method for manufacturing a rotor in the order of FIGS. 3a and 3b.

  In this rotor core 10A, as shown in FIG. 3a, the relatively small-sized permanent magnet 2 is inserted into the magnet insertion slot 13, and then, the rotor core 10A is preliminarily molded with a magnetic material in the gap at the rotor center side. The fixed material 5 is inserted.

  As shown in FIG. 3a, even when the standard material 5 is inserted, a gap is formed between the fixed member 5 and the inner side surface 13b of the slot 13 on the rotor center side. As shown in FIG. Material 4 is pressure filled. Next, the non-magnetic resin material 3 is filled and cured in the resin filling slot 14 to manufacture a rotor in which the air gap in the slot 13 is completely eliminated.

  In this manufacturing method, the filled magnetic material 4 flows into the resin filling slot 14 by setting the longitudinal dimension of the fixed material 5 formed of the magnetic material to be approximately the same as the longitudinal dimension of the slot 13. Is completely deterred. Further, the pressing force from the magnetic material 4 filled under pressure becomes an equal force through the fixed material 5, and the side surface of the permanent magnet 2 is pushed into the stator side, and the stator side surface of the permanent magnet 2 is inserted into the slot 13. The stator side inner surface 13a can be brought into close contact with high accuracy.

  FIG. 4 is a flowchart illustrating still another embodiment of the method for manufacturing a rotor in the order of FIGS. 4a and 4b, and FIG. 5 is a flowchart subsequent to this.

  In the rotor core 10B, as shown in FIG. 4a, the slot 13 is formed of a first slot 13A on the stator side and a second slot 13B on the rotor center side, and a partition member 15 made of a rotor core material is provided between the slots. Are formed to define slots 13A and 13B. Here, the vicinity of the center of the partition member 15 is curved toward the first slot 13A, and the permanent magnet 2 having a short side larger than the short side dimension is inserted into the first slot 13A. It has become so.

  When the permanent magnet 2 is inserted into the first slot 13A as shown in FIG. 4b, the curved portion at the center of the partition member 15 is pushed out to the rotor central side by the permanent magnet 2 (in the direction of arrow X1 in FIG. 4b). As a result, the size of the second slot 13B is reduced. That is, the partition member 15 can be easily deformed to the second slot 13B side when the permanent magnet 2 is inserted into the first slot 13A, and has rigidity and flexibility that does not cause damage when deformed. It is set to the provided member thickness and member length.

  Next, as shown in FIG. 5, the partition material 15 that has been deformed to the second slot 13B side is pushed back to the permanent magnet 2 side by pressurizing and filling the magnetic material 4 into the second slot 13B (see FIG. 5). 5) (arrow X2 direction), the partition member 15 is brought into close contact with the permanent magnet 2 to manufacture a rotor in which the air gaps in the slots 13A and 13B are completely eliminated.

  FIG. 6 is a flowchart illustrating still another embodiment of the rotor manufacturing method in the order of FIGS. 6a and 6b, and FIG. 7 is a flowchart subsequent to this.

  In the rotor core 10C, as in the rotor core 10B, as shown in FIG. 6a, a first slot 13A on the stator side and a second slot 13B on the rotor center side are formed, and a partition made of the rotor core material is formed between both of them. A material 15 is formed to define slots 13A and 13B.

  In this embodiment, the partition member 15 is linear, and as shown in FIG. 6b, the permanent magnet 2 having a smaller dimension than the slot 13A is inserted into the first slot 13A. When the permanent magnet 2 is inserted, a gap G is formed between the permanent magnet 2 and the inner surface of the slot 13A on the rotor center side.

  Next, as shown in FIG. 7, the magnetic material 4 is pressurized and filled in the second slot 13 </ b> B to spread the partition material 15 toward the permanent magnet 2 (in the direction of arrow Y in FIG. 7). Is brought into close contact with the permanent magnet 2 to manufacture a rotor in which the air gaps in the slots 13A and 13B are completely eliminated.

  According to any of the above-described manufacturing methods, the air gap between the slot and the permanent magnet, in particular, the air gap between the side surfaces on the stator side and between the side surfaces on the rotor central side is completely blocked. The torque performance, rotational performance, and motor efficiency of the IPM motor having 10, 10A, 10B, and 10C are remarkably improved as compared with the conventional structure IPM motor.

  The above manufacturing method relies on the technical idea that the gap between the slot and the permanent magnet is filled with a magnetic material to close the air gap, and a simple method for realizing this. It does not increase the manufacturing cost at all.

  The high-performance IPM motor including the rotor cores 10, 10A, 10B, and 10C described above is suitable for a hybrid vehicle and an electric vehicle that require high motor performance for the drive motor.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

It is the top view which showed one Embodiment of the rotor for IPM motors of this invention. It is the flowchart explaining the method to manufacture the rotor of FIG. 1 in order of (a), (b). It is the flowchart explaining the method of manufacturing other embodiment of the rotor for IPM motors in order of (a), (b). It is the flowchart explaining the method of manufacturing further another embodiment of the rotor for IPM motors in order of (a), (b). It is the flowchart explaining the manufacturing method following FIG. It is the flowchart explaining the method of manufacturing further another embodiment of the rotor for IPM motors in order of (a), (b). FIG. 7 is a flowchart illustrating a manufacturing method subsequent to FIG. 6.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Permanent magnet, 3 ... Nonmagnetic resin material, 4 ... Magnetic material, 5 ... Fixed material which consists of magnetic materials, 10, 10A, 10B, 10C ... Rotor core, 11 ... Stator side surface, 12 ... Rotor center groove, 13 ... Slot for magnet insertion, 13a: inner surface on the stator side, 13b ... inner surface on the rotor central side, 13A ... first slot, 13B ... second slot, 14 ... slot for resin filling, 15 ... partition material, G ... gap

Claims (7)

A method for manufacturing a rotor for an IPM motor in which a permanent magnet is inserted into a magnet slot inside the rotor,
A method for manufacturing a rotor for an IPM motor, wherein a permanent magnet having a smaller dimension than the slot is inserted into a magnet slot, and a magnetic material is filled between the permanent magnet and an inner surface of the slot on the rotor central side. The slot is formed of a first slot on the stator side and a second slot on the rotor center side, and the partition material formed integrally with the rotor defines the first and second slots. Provided,
2. The IPM motor according to claim 1, wherein the permanent magnet is inserted into the first slot to deform the partition member toward the second slot, and then the second slot is filled with the magnetic material. A method for manufacturing a rotor. The slot is formed of a first slot on the stator side and a second slot on the rotor center side, and the partition material formed integrally with the rotor defines the first and second slots. Provided,
The permanent magnet having a smaller dimension than the first slot is inserted into the first slot, and then the partition material is pressed toward the stator side by filling the second slot with the magnetic material. The manufacturing method of the rotor for IPM motors of Claim 1 which makes a magnet and a partition material contact | adhere.   A magnetic material is filled between the fixed body and the inner surface of the slot on the rotor central side after inserting the fixed body made of a magnetic material between the permanent magnet and the inner surface of the slot on the rotor central side. Item 2. A method for manufacturing a rotor for an IPM motor according to Item 1. A rotor for an IPM motor,
A slot for a magnet;
A permanent magnet that is inserted and fixed in the magnet slot and has a smaller size than the slot;
A rotor for an IPM motor, comprising: a permanent magnet and a magnetic body in which a magnetic material is filled and cured between an inner surface of the slot on the rotor central side. The slot is formed of a first slot on the stator side and a second slot on the rotor center side, and the partition material formed integrally with the rotor defines the first and second slots. Provided,
The permanent magnet is fixed in the first slot, the magnetic material formed by filling and curing the magnetic material is provided in the second slot, and the partition member is in close contact with the permanent magnet. Item 6. The rotor for an IPM motor according to Item 5.   The rotor for an IPM motor according to claim 6, wherein the partition member is curved toward the stator side and maintains a posture in which the permanent magnet is pressed toward the stator side.

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