JP6251900B2 - Permanent magnet rotating electric machine - Google Patents

Description

  The present invention relates to a permanent magnet type rotating electric machine, and is particularly suitable for application to an interior permanent magnet motor (IPM).

As a permanent magnet type rotating electrical machine, for example, there is one as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2008-131813).
Here, an outline of a conventional permanent magnet type rotating electric machine will be described with reference to FIGS. 11 and 12. FIG. 11 is a cross-sectional view showing a rotor of an IPM type permanent magnet type rotating electrical machine in a cross section orthogonal to the rotation axis, and FIG. 12 is a block diagram showing a ventilation duct provided in the rotor.

As shown in FIG. 11, a rotor core 12 is attached to a shaft 11 of a rotor 10 of a permanent magnet type rotating electrical machine. The rotor core 12 is configured by laminating a plurality of electromagnetic steel plates 13 and interposing a ventilation duct 20 as shown in FIG. 12 in a part of the axial direction. In this case, the radial dimension of the electromagnetic steel sheet 13 and the ventilation duct 20 is the same.
In the rotor core 12, a magnet insertion hole 14 and a cooling axial duct 15 are formed in an axially extending state in a portion where the electromagnetic steel plates 13 are laminated. A permanent magnet 16 is inserted into the magnet insertion hole 14.

  Further, a cooling air passage 17 extending in the axial direction is formed in the rotor core 12 (the portion where the electromagnetic steel plates 13 are laminated and the air duct 20).

As shown in FIG. 12, the ventilation duct 20 is configured by arranging duct pieces 22 radially on a duct plate 21. For this reason, the cooling air that has traveled in the axial direction through the cooling axial duct 15 hits the duct plate 21 and can pass through the duct space 23 to the stator side.
The ventilation duct 20 is disposed at a plurality of locations in the axial direction of the rotor 10.

As the assembly procedure of the rotor 10 of the permanent magnet type rotating electrical machine described above, the following two procedures can be considered.
(1) A step of laminating a predetermined number of electromagnetic steel plates 13, a step of inserting unmagnetized permanent magnets 16 into the magnet insertion holes 14 of the laminated electromagnetic steel plates 13, and a step of placing the ventilation duct 20 are sequentially repeated. Thus, the rotor core 12 into which the non-magnetized permanent magnet 16 is inserted is formed. Thereafter, the rotor core 12 provided with the permanent magnet 16 is attached to the shaft 11. Further, the permanent magnet 16 inserted in the rotor core 12 is magnetized.
(2) A step of laminating a predetermined number of electromagnetic steel plates 13, a step of inserting a magnetized permanent magnet 16 into the magnet insertion hole 14 of the laminated electromagnetic steel plates 13, and a step of placing the ventilation duct 20 are sequentially repeated. Thus, the rotor core 12 into which the magnetized permanent magnet 16 is inserted is formed. Thereafter, the rotor core 12 provided with the permanent magnet 16 is attached to the shaft 11.
In the assembly procedures (1) and (2), the permanent magnet 16 is inserted into the magnet insertion hole 14 of the electromagnetic steel sheet 13 with the adhesive applied to the surface thereof.

JP 2008-131814 A

By the way, especially when manufacturing a large-sized interior permanent magnet motor (IPM), “a rotor core without a permanent magnet inserted / arranged is attached to a shaft, and then magnetized. It is necessary to insert a permanent magnet into the rotor core.
The reason is as follows (A) and (B).
In addition, as a method of attaching the rotor core to which the permanent magnet is not inserted / arranged to the shaft, there is a method by “shrink fitting”, a method by combining “shrink fitting” and “press fitting”, and “press fitting”. There are methods.

(A) Reason 1
When an unmagnetized permanent magnet is inserted into the rotor core, the rotor core is attached to the shaft, and then the permanent magnet is magnetized by a magnetizing device, the magnet is magnetized because the rotor is large. This is because there are many difficulties in terms of cost and technology.
More specifically, if the rotor is large in terms of cost, a magnetizing device into which the large rotor can be inserted and a large-capacity power supply device are required. This is because it is practically difficult to prepare such a large magnetizing device and power supply device for magnetizing because a large installation space is required. That is, in the case of the magnetizing device, since a magnetic field is generated around the magnetizing device, other metal devices or the like cannot be arranged around the magnetizing device. For this reason, in a large-sized magnetizing apparatus, if an apparatus installation space and its surrounding space are included, an extremely wide space is required, so it is practically difficult to use such a large-sized magnetizing apparatus. .
In addition, because all the magnetizing devices suitable for the number of magnetic poles and the diameter of the rotor must be prepared depending on the difference in the number of magnetic poles and the motor (rotor diameter), the cost is greatly increased.
From a technical point of view, in the case of a multi-pole machine such as this time, a permanent magnet having a magnetic pole to be magnetized (for example, a permanent magnet to be N-pole) and a permanent magnet having a magnetic pole adjacent to the magnetic pole (for example, S-pole) The distance from the permanent magnet is narrow.
For this reason, when trying to magnetize the permanent magnet of each magnetic pole by the magnetizing device, for example, the boundary portion between the permanent magnet that is magnetized to the N pole and the S pole that is magnetized adjacently is sufficient. There is a possibility that a strong magnetizing force cannot be applied to the magnet. Also, when trying to magnetize all the unmagnetized permanent magnets at once with the magnetizing device, the adjacent permanent magnets are magnetized with the opposite polarity. This is because a reverse magnetic field caused by an adjacent permanent magnet acts and an appropriate magnetization intensity cannot be obtained.

(B) Reason 2
When a magnetized permanent magnet is inserted into the rotor core, when the rotor core is attached to the shaft, a method that uses “shrink fit” or a combination of “shrink fit” and “press fit” is used. In such a case, the permanent magnet is demagnetized by heat during shrink fitting.

  However, in the case of manufacturing the above-described large interior permanent magnet motor (IPM), “a rotor core on which no permanent magnet is inserted / arranged is attached to a shaft, and then magnetized. The method of “inserting and arranging the permanent magnets in the rotor core” cannot be employed in the permanent magnet type rotating electrical machines shown in FIGS. 11 and 12.

  This is because, even if an attempt is made to insert the magnetized permanent magnet 16 into the rotor core after the rotor core 12 to which the permanent magnet 16 has not been inserted / arranged is attached to the shaft, the ventilation duct 20 is inserted in the middle of the rotor core. This is because the permanent magnet 16 hits the ventilation duct 20 and the permanent magnet 16 cannot be inserted at a position beyond that.

Further, if the diameter of the ventilation duct 20 shown in FIG. 12 is reduced so that the outer peripheral edge of the ventilation duct 20 is located closer to the inner periphery than the position of the magnet insertion hole 14, the magnetized permanent magnet 16 is inserted. It seems to be possible to do it at first glance. However, as a result of the experiment, it has been found that in this case, the outer peripheral portion of the electromagnetic steel sheet 13 may be bent toward the duct space 23 at the position where the ventilation duct 20 is disposed.
That is, as schematically shown in FIGS. 13A and 13B, the outer peripheral portion of the electromagnetic steel sheet 13 is bent at the position of the duct space 23 from the position where the permanent magnet 16 is inserted.
FIG. 13A shows a state in which one electromagnetic steel plate 13 is bent, and FIG. 13B shows a state in which both electromagnetic steel plates 13 are bent and contacted. Moreover, (PHI) has shown magnetic flux.

Thus, the following reasons can be considered as a factor which the electromagnetic steel plate 13 bends in the outer peripheral part of the electromagnetic steel plate 13 (an outer peripheral part from the insertion position of the permanent magnet 16).
(A) When the permanent magnet 16 inserted through the magnet insertion hole 14 enters the duct space 23 and then is inserted into the next permanent magnet insertion hole 14, the permanent magnet 16 is caught by a minute step. As a result, the electromagnetic steel sheet 13 adjacent to the duct space 23 is bent.
(B) When a magnetized permanent magnet 16 is inserted into a magnet insertion hole 14 and no permanent magnet 16 is inserted into the adjacent magnet insertion hole 14, due to the strong magnetic force of the permanent magnet 16, When the electromagnetic steel sheet 13 adjacent to the duct space 23 where the permanent magnet 16 is not inserted is pulled, the pulled electromagnetic steel sheet 13 is bent.

When the electromagnetic steel sheet 13 is bent in this way, the following problem occurs.
(i) Vibration and noise increase.
(ii) When the magnetic steel sheet 13 is bent and closes the duct space 23, it becomes difficult for the cooling air sent to the stator side to pass through and the cooling effect is reduced.
(iii) Since the magnetic flux φ is guided along the bent electromagnetic steel sheet 13, the magnetic flux φ enters at a bent angle without entering perpendicularly to the stator, resulting in a decrease in motor efficiency (see FIG. 13).
(iv) Adhesion between the permanent magnet 16 and the electromagnetic steel sheet 13 is insufficient. Moreover, there exists a possibility that the electromagnetic steel plate 13 may crack by the deformation | transformation which is not intended.

  In view of the above-described prior art, the present invention provides a manufacturing method of “attaching a rotor core on which a permanent magnet is not inserted / arranged to a shaft and then inserting / arranging a magnetized permanent magnet in the rotor core”. An object of the present invention is to provide a permanent magnet type rotating electrical machine that can prevent bending of an electromagnetic steel sheet that constitutes a rotor core even if it is adopted.

The present invention for solving the above problems
A rotor core in which laminated electrical steel sheets and ventilation ducts are alternately laminated along the axial direction ;
In a permanent magnet type rotating electrical machine in which a rotor is formed by a permanent magnet inserted and arranged in the rotor core,
In the rotor core, a magnet insertion hole for inserting the permanent magnet is formed in a state of penetrating the electromagnetic steel plate and the ventilation duct,
The ventilation duct is formed by a duct plate and a duct piece provided on the duct plate, and the duct piece is not only disposed at a position on the inner peripheral side than the position of the magnet insertion hole, It is also arranged at a position on the outer peripheral side than the position of the magnet insertion hole ,
The duct piece arranged at a position on the outer peripheral side of the position of the magnet insertion hole extends in a direction orthogonal to the radial direction and the axial direction of the rotor core, and at least one is arranged per magnetic pole. It is characterized by.

The configuration of the present invention is as follows.
A rotor core in which laminated electrical steel sheets and ventilation ducts are alternately laminated along the axial direction;
In a permanent magnet type rotating electrical machine in which a rotor is formed by a permanent magnet inserted and arranged in the rotor core,
In the rotor core, a magnet insertion hole for inserting the permanent magnet is formed in a state of penetrating the electromagnetic steel plate and the ventilation duct,
The ventilation duct is formed by a duct plate and a duct piece provided on the duct plate, and the duct piece is not only disposed at a position on the inner peripheral side than the position of the magnet insertion hole, It is also arranged at a position on the outer peripheral side than the position of the magnet insertion hole,
The duct piece disposed at a position on the outer peripheral side with respect to the position of the magnet insertion hole is formed to be curved along the outer peripheral surface of the rotor core.

The configuration of the present invention is as follows.
The duct piece disposed at a position on the outer peripheral side with respect to the position of the magnet insertion hole is formed of a non-magnetic material.

According to the present invention, the ventilation duct provided in the rotor includes the duct plate and the duct piece provided in the duct plate, and the duct piece is disposed at a position on the inner peripheral side with respect to the position of the magnet insertion hole. In addition, it is arranged at a position on the outer peripheral side of the position of the magnet insertion hole. Thus, since the duct piece is also arranged at a position on the outer peripheral side from the position of the magnet insertion hole, even if the permanent magnet is inserted into the magnet insertion hole of the rotor core, the outer peripheral portion of the electromagnetic steel sheet is not It can prevent bending to the duct space side. Therefore, the following effects are obtained.
(i) There is no vibration or noise due to bending of the duct plate or laminated steel plate.
(ii) The duct space is not blocked, the ventilation path for the cooling air sent to the stator side can be ensured reliably, and the cooling effect by the duct space is ensured.
(iii) The magnetic flux of the permanent magnet enters perpendicularly to the stator, and the motor efficiency is improved.
(iv) The permanent magnet can be securely bonded to the electromagnetic steel sheet.

  In addition, even if the manufacturing method of “attaching a rotor core with no permanent magnets inserted / arranged to the shaft and then inserting / arranging magnetized permanent magnets into the rotor core” is adopted, It is possible to prevent the outer peripheral portion from being bent toward the duct space.

1 is a side view showing a rotor of a magnet-embedded electric motor according to an embodiment of the present invention. The front view which shows the rotor of a present Example. The block diagram which shows the ventilation duct of a present Example. The block diagram which shows the ventilation duct of a present Example. The block diagram which shows the principal part of the rotor of a present Example. The block diagram which shows the modification of the ventilation duct of a present Example. The block diagram which shows the modification of the ventilation duct of a present Example. The block diagram which shows the modification of the ventilation duct of a present Example. The block diagram which shows the modification of the ventilation duct of a present Example. The block diagram which shows the modification of the ventilation duct of a present Example. Sectional drawing which shows the rotor of the conventional permanent magnet type rotary electric machine. The block diagram which shows the ventilation duct of the conventional permanent magnet type rotary electric machine. The block diagram which shows the fault of a prior art.

  Hereinafter, a permanent magnet type rotating electrical machine according to the present invention will be described in detail based on examples.

[Example 1]
FIG. 1 is an end view (side view) showing a rotor 100 of an interior permanent magnet motor (IPM) according to an embodiment of the present invention, and FIG. 2 shows only a portion of the rotor core 110. FIG. In FIG. 1, the clasp and the magnet pressing member are not shown.

  As shown in FIG. 1, a spider 102 is attached to a shaft 101 of a rotor 100 of a magnet-embedded motor, and a rotor core 110 is attached to the spider 102 by shrink fitting or the like.

  As shown in FIG. 2, the rotor core 110 has a large number of laminated electromagnetic steel plates 111 and ventilation holes arranged at a plurality of locations (5 locations in this example) along the axial direction of the laminated electromagnetic steel plates 111. A duct 120 is provided. And the clamp 112 is attached to the both end surfaces of many electromagnetic steel plates 111 which were laminated | stacked with the ventilation duct 120 interposed, and the whole is clamp | tightened.

The manufacturing procedure of the rotor core 110 is as follows.
・ First, set one clamp 112 on a flat surface,
-A plurality of electromagnetic steel plates 111 to be the first block B1 are laminated on the clasp 112, and the first ventilation duct 120 is placed thereon,
-A plurality of electromagnetic steel plates 111 to be the second block B2 are laminated thereon, and the second ventilation duct 120 is placed thereon,
-A plurality of electromagnetic steel sheets 111 to be the third block B3 are laminated thereon, and the third ventilation duct 120 is placed thereon,
-A plurality of electromagnetic steel plates 111 to be the fourth block B4 are laminated thereon, and the fourth ventilation duct 120 is placed thereon,
-A plurality of electromagnetic steel sheets 111 to be the fifth block B5 are laminated thereon, and the fifth ventilation duct 120 is placed thereon,
-A plurality of electromagnetic steel sheets 111 to be the second block B6 are laminated thereon, and the other clamp 112 is placed thereon,
-The rotor core 11 is formed by tightening the whole with bolts or the like.

  A magnet insertion hole 115 is formed in the rotor core 110 so as to penetrate the electromagnetic steel plate 111 and the ventilation duct 120. The magnet insertion hole 115 extends in the axial direction and penetrates at a plurality of locations extending in the circumferential direction. That is, the magnet insertion hole 115 is formed in a portion constituting the magnetic pole.

A permanent magnet 116 is inserted into each magnet insertion hole 115. More specifically, in this example, six permanent magnets 116 are inserted into one magnet insertion hole 115, and the axial length of each permanent magnet 116 is equivalent to one block of each of the blocks B1 to B6. It is equal to the axial length. And the permanent magnet 116 is arrange | positioned in the magnet insertion hole 115 formed in each block B1-B6 formed by laminating | stacking the electromagnetic steel plate 111, and is not located in the part of the ventilation duct 120. FIG.

  Further, cooling air passages 117 extending in the axial direction are formed on the outer peripheral surface of the rotor core 110 at a plurality of locations extending in the circumferential direction.

  Next, the ventilation duct 120 is demonstrated with reference to FIG.3 and FIG.4 (a), (b). 3 shows a surface of the ventilation duct 120 where the duct pieces 122a and 122b are not arranged, and FIG. 4A is an enlarged view of the surface of the ventilation duct 120 where the duct pieces 122a and 122b are arranged. FIG. 4 (b) shows a cross section of FIG. 4 (a).

As shown in FIG. 3, the ventilation duct 120 has a ring plate shape as a whole. As shown in FIG. 4, the ventilation duct 120 is formed by arranging duct pieces 122 a and 122 b on one surface of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122b is arranged at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122b extends linearly in a direction perpendicular to the radial direction of the rotor core 110, and one duct piece 122b is disposed per magnetic pole.

  As in the case of the duct piece 122a, there is a conventional one that is radially arranged at a position closer to the inner periphery than the position of the magnet insertion hole 115. However, the duct piece 122b, which is disposed at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115, has not been found conventionally, and is one of the unique configurations of the present invention.

As shown in FIG. 5, the duct pieces 122 a and 122 b of the ventilation duct 120 abut against the electromagnetic steel plate 111 of the adjacent block, and secure a duct space 123 between the adjacent electromagnetic steel plate 111 and the duct plate 121. Yes.
Therefore, the cooling air can pass through the duct space 123 to the stator side.

Here, an outline of a manufacturing procedure of the rotor 100 configured as described above will be described.
First, the rotor core 110 including the electromagnetic steel plate 111, the ventilation duct 120, and the clasp 122 is formed. The permanent magnet 116 has not been inserted into the rotor core 110 yet.
The rotor core 110 into which the permanent magnet 116 is not inserted is attached to the spider 102 by shrink fitting or the like. That is, the rotor core 110 is attached to the shaft 101 via the spider 102.
Finally, an adhesive material is applied to the surface of the magnetized permanent magnet 116, and the permanent magnets 116 to which the adhesive material has been applied are sequentially inserted into the magnet insertion holes 115 one by one. Place at the position.

According to this manufacturing procedure, the permanent magnet 116 is inserted after the rotor core 110 is attached to the shaft 101. For this reason, the large-scale magnetization that has been a problem in the conventional method of “attaching the rotor core to the shaft and then magnetizing the permanent magnet with the unmagnetized permanent magnet inserted into the rotor core” There is no problem such as the need for a device.
Even if shrink fitting is employed as a method of attaching the rotor core 110 to the shaft 101, heat due to shrink fitting does not act on the permanent magnet 116. There is no decline.

Further, even when the permanent magnet 116 is inserted into the magnet insertion hole 115, as shown in FIG. 5, the outer peripheral side portion of the electromagnetic steel sheet 111 adjacent to the duct space 123 is not bent toward the duct space 123 side. Absent.
The reason for this is that since the duct piece 122b of the ventilation duct 120 is in contact with the outer peripheral side portion of the electromagnetic steel plate 111 adjacent to the duct space 123, stress due to magnet insertion is applied to the outer peripheral portion of the electromagnetic steel plate 111. However, the duct piece 122b supports the stress to prevent the electromagnetic steel sheet 111 from being bent.

Note that if the duct piece 122b is formed of a non-magnetic material (for example, stainless steel), loss due to generation of eddy current in this portion can be prevented.
That is, when the duct piece 122b is a magnetic body, the magnetic flux φ passes through the duct piece 122b as shown by the dotted arrow in FIG. 5, and an eddy current is generated in this portion. This loss due to eddy current leads to a reduction in motor efficiency.
Here, by making the duct piece 122b non-magnetic, generation of eddy current can be prevented and motor efficiency can be improved.

[Example 2]
Next, various modifications of the ventilation duct provided in the rotor core 110 will be described as a second embodiment. In addition, since the structure of another part is the same as Example 1, description of the part same as Example 1 is abbreviate | omitted.

The ventilation duct 120A shown in FIG. 6 has a ring plate shape as a whole. This ventilation duct 120 </ b> A is configured by arranging duct pieces 122 a and 122 c on one surface of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122c is arranged at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122c extends linearly in a direction perpendicular to the radial direction of the rotor core 110, and two duct pieces 122c are arranged per magnetic pole.

  In the ventilation duct 120A shown in FIG. 6, two duct pieces 122c and 122c are arranged per magnetic pole, and there is a gap between the two duct pieces 122c and 122c, so that cooling that passes from the rotor 100 side to the stator side is performed. The wind can flow better and the cooling effect can be enhanced.

The ventilation duct 120B shown in FIG. 7 has a ring plate shape as a whole. This ventilation duct 120 </ b> B is configured by arranging duct pieces 122 a and 122 d on one surface of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122d is disposed at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122d is formed to be curved along the outer peripheral surface of the rotor core 110.

The ventilation duct 120C shown in FIG. 8 has a ring plate shape as a whole. The ventilation duct 120 </ b> C is configured by arranging duct pieces 122 a and 122 e on one side of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122e is arranged at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122e extends obliquely and linearly with respect to the direction perpendicular to the radial direction of the rotor core 110, and three duct pieces 122e are arranged per magnetic pole. Moreover, the three duct pieces 122e, 122e, 122e are arranged in parallel with a gap between them.

As described above, since the three duct pieces 122e are arranged obliquely, when the rotor 100 rotates, the function of the duct piece 122e as a fan for sending air to the stator side is further increased and more effective. You can Do not cooling.
If the duct piece 122e has a curved shape that enhances the function as a fan, a further cooling effect can be exhibited.

The ventilation duct 120D shown in FIG. 9 has a ring plate shape as a whole. This ventilation duct 120 </ b> D is configured by arranging duct pieces 122 a and 122 f on one side of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122f is disposed at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122f has a cylindrical shape, and three pieces are arranged per one magnetic pole. Moreover, the three duct pieces 122f, 122f, and 122f are arranged on a straight line orthogonal to the radial direction of the rotor core 110 with a gap between them.

The ventilation duct 120E shown in FIG. 10 has a ring plate shape as a whole. This ventilation duct 120E is configured by arranging duct pieces 122a and 122g on one side of a duct plate 121.
The duct piece 122a is radially arranged at a position on the inner peripheral side with respect to the position of the magnet insertion hole 115.
Further, the duct piece 122g is arranged at a position on the outer peripheral side with respect to the position of the magnet insertion hole 115. The duct piece 122g has a triangular prism shape, and three duct pieces are arranged per one magnetic pole. Moreover, the three duct pieces 122g, 122g, 122g are arranged on the straight line perpendicular to the radial direction of the rotor core 110 with a gap between them.

  Note that if the duct pieces 122c, 122d, 122e, 122f, and 122g shown in FIGS. 6 to 10 are formed of a non-magnetic material (for example, stainless steel), loss due to generation of eddy currents in this portion can be prevented. Can do.

  The permanent magnet type rotating electrical machine of the present invention can be applied not only to an interior permanent magnet motor (IPM) but also to an interior magnet generator.

DESCRIPTION OF SYMBOLS 100 Rotor 101 Shaft 102 Spider 110 Rotor core 111 Magnetic steel plate 112 Clasp 115 Magnet insertion hole 116 Permanent magnet 117 Cooling ventilation groove 120, 120A, 120B, 120C, 120D, 120E Ventilation duct 121 Duct plates 122a, 122b, 122c , 122d, 122e, 122f, 122g Duct piece 123 Duct space

Claims (3)

A rotor core in which laminated electrical steel sheets and ventilation ducts are alternately laminated along the axial direction ;
In a permanent magnet type rotating electrical machine in which a rotor is formed by a permanent magnet inserted and arranged in the rotor core,
In the rotor core, a magnet insertion hole for inserting the permanent magnet is formed in a state of penetrating the electromagnetic steel plate and the ventilation duct,
The ventilation duct is formed by a duct plate and a duct piece provided on the duct plate, and the duct piece is not only disposed at a position on the inner peripheral side than the position of the magnet insertion hole, It is also arranged at a position on the outer peripheral side than the position of the magnet insertion hole ,
The duct piece arranged at a position on the outer peripheral side of the position of the magnet insertion hole extends in a direction orthogonal to the radial direction and the axial direction of the rotor core, and at least one is arranged per magnetic pole. a permanent magnet type rotating electrical machine, characterized in that is. A rotor core in which laminated electrical steel sheets and ventilation ducts are alternately laminated along the axial direction;
In a permanent magnet type rotating electrical machine in which a rotor is formed by a permanent magnet inserted and arranged in the rotor core,
In the rotor core, a magnet insertion hole for inserting the permanent magnet is formed in a state of penetrating the electromagnetic steel plate and the ventilation duct,
The ventilation duct is formed by a duct plate and a duct piece provided on the duct plate, and the duct piece is not only disposed at a position on the inner peripheral side than the position of the magnet insertion hole, It is also arranged at a position on the outer peripheral side than the position of the magnet insertion hole,
The permanent magnet type rotating electrical machine , wherein the duct piece disposed at a position on the outer peripheral side of the position of the magnet insertion hole is curved along the outer peripheral surface of the rotor core . Oite to claim 1 or claim 2,
The permanent magnet type rotating electrical machine, wherein the duct piece disposed at a position on the outer peripheral side of the position of the magnet insertion hole is formed of a non-magnetic material.

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