JP2006050820A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine that can obtain high torque by reducing leakage magnetic flux at a bridge, and improves reliability in high rotation. <P>SOLUTION: A magnet-embedded motor has a stator 2 and a rotor 3 in which a wire is wound around a plurality of teeth 7, and utilizes reluctance torque. In this case, the rotor 3 comprises a plurality of non-magnetic circuit formation sections 12 circumferentially arranged, and a plurality of bridges 21 for connecting a magnetic circuit formation section 14 placed at a side closer than the non-magnetic circuit formation section 12, and other magnetic circuit formation sections 15 to an air gap 13 at both the sides of each non-magnetic circuit formation section. Each thickness of the plurality of bridges 21 is set to be thinner than that of other portions. Magnetic reluctance at each bridge 21 becomes large, thus reducing the amount of leakage of a flux leaking through each bridge 21, and hence obtaining high torque. And each magnetic circuit formation section 14 can be retained in high rotation, thus increasing the reliability in the magnet-embedded motor in high rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine that uses reluctance torque, such as a motor that uses both magnet torque and reluctance torque, and a motor that uses only reluctance torque.

  Examples of motors that use reluctance torque include embedded magnet type motors that use both magnet torque and reluctance torque. The embedded magnet type motor includes a stator in which a winding is wound around a plurality of teeth arranged in the circumferential direction, and a rotor in which a plurality of permanent magnets are embedded in a magnet housing hole.

Conventionally, an embedded magnet type motor using a rotor as shown in FIG. 14 is known (see, for example, Patent Document 1).
The rotor 140 shown in FIG. 14 is used for an internal rotation type interior magnet type motor. The rotor 140 is provided with a plurality of sets of two V-shaped magnet receiving holes 141 and 142 in the circumferential direction. Permanent magnets (not shown) are embedded in the two magnet housing holes 141 and 142 of each set. The two magnet housing holes 141 and 142 of each set are open on the air gap side (radially outer side) between the stator and the anti-air gap side (radially inner side) with the reinforcing bridge portion 143. The rotor 140 has a magnetic path forming portion 144 on the side closer to the air gap than the two magnet receiving holes 141 and 142 and other magnetic path forming on both sides of the two magnet receiving holes 141 and 142 of each set. Bridge portions 146 that connect the portions 145 are provided.

  Such an embedded magnet type motor is generated by reluctance torque generated by the magnetic flux generated by the stator passing through the rotor and the magnetic flux generated by the permanent magnet interlinks with the stator winding through the magnetic path forming portion 144. The magnet torque to be used is used as the motor torque.

On the other hand, a rotor structure of a synchronous motor using a rotor without a bridge portion is known (see, for example, Patent Document 2). As shown in FIG. 15, this rotor structure has a plurality of magnets 151 magnetized in the circumferential direction and a plurality of laminated rotor cores 152 sandwiching each of the plurality of magnets 151 in the circumferential direction alternately around the shaft 153. It is arranged.
JP 2002-345189 A Japanese Patent Publication No.8-17543

  Incidentally, in the conventional embedded magnet type motor shown in FIG. 14, a part of the magnetic flux generated by each permanent magnet embedded in the two magnet housing holes 141 and 142 flows from the magnetic path forming portion 144 to the left and right bridge portions 146. Leakage magnetic flux is generated. As a result, the magnetic flux is closed in the rotor 140, and the magnetic flux of the permanent magnet cannot be used effectively. Therefore, the magnet torque is reduced by the amount of the leakage magnetic flux, and a high torque cannot be obtained. It was. Similarly, the magnetic flux generated by the stator that passes through the rotor in the above-described path may generate a leakage magnetic flux that partially flows through the bridge portion 146 to the magnetic path forming portion 144. In this case, there is a problem that the reluctance torque is reduced by the amount of the leakage magnetic flux, and a high torque cannot be obtained.

On the other hand, in the conventional rotor structure shown in FIG. 15, the rotor 1 of the embedded magnet type motor shown in FIG.
Since there is nothing to hold a permanent magnet like the bridge portion 146 at 40, there is a problem that it cannot cope with high rotation.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotating electrical machine capable of reducing leakage magnetic flux in a bridge portion to obtain a high torque and improving reliability at high rotation. It is to provide.

  In order to solve the above-mentioned problem, an invention according to claim 1 is a rotating electrical machine that uses a reluctance torque and includes a stator having a winding wound around a plurality of teeth arranged in a circumferential direction and a rotor. The rotor includes a plurality of non-magnetic path forming portions arranged in the circumferential direction, a magnetic path forming portion on the side closer to the air gap between the stator and the non-magnetic path forming portion, and other magnetic path forming portions. And a plurality of bridge portions for connecting to each other, wherein the thickness or the cross-sectional area of each of the plurality of bridge portions is smaller than the other portions.

  The “rotary electric machine using reluctance torque” here is used to include a rotary electric machine that uses only reluctance torque and a rotary electric machine that uses both reluctance torque and magnet torque.

  According to this, since the thickness or cross-sectional area of each bridge part is made smaller than the other parts, the magnetic resistance in each bridge part becomes large. Thereby, in the rotary electric machine which utilizes only reluctance torque, the amount of magnetic flux leakage by which the magnetic flux by a stator leaks through each bridge part can be reduced. In a rotating electrical machine that uses both reluctance torque and magnet torque, reduce both the amount of magnetic flux leakage that the magnetic flux from the stator leaks through each bridge part and the amount of magnetic flux leakage that the magnetic flux from the permanent magnet leaks through each bridge part. Can do. Therefore, the reluctance torque or both the reluctance torque and the magnet torque can be used effectively, and a high torque can be obtained. In addition, each bridge portion has a structure in which each magnetic path forming portion on the side closer to the air gap than the non-magnetic path forming portion is held by the rotor, so that each magnetic path forming portion is held at high revolutions. Thus, the reliability of the rotating electrical machine at the time of high rotation can be improved.

  According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the rotor is rotatably accommodated inside the stator, and each of the plurality of non-magnetic path forming portions is provided for each magnetic pole. Including at least one non-magnetic path forming portion that is provided continuously in the circumferential direction, and the plurality of bridge portions include a plurality of bridge portions on the outer peripheral side provided for each of the magnetic poles on the outer peripheral side of the rotor, The bridge part on the outer peripheral side of the magnetic pole connects the magnetic path forming part radially outside the non-magnetic path forming part and the other magnetic path forming part on both sides of the at least one non-magnetic path forming part. It is a summary.

  According to this, in a rotary electric machine of a type having a bridge portion only on the outer peripheral side of the rotor, high torque can be obtained and the reliability of the rotary electric machine at high rotation can be increased.

According to a third aspect of the present invention, in the rotating electrical machine according to the first aspect, the rotor is rotatably accommodated inside the stator, and each of the plurality of non-magnetic path forming portions is provided for each magnetic pole. Two or more non-magnetic path forming portions provided independently along the circumferential direction, and the plurality of bridge portions include a plurality of bridge portions on the outer peripheral side provided for each of the magnetic poles on the outer peripheral side of the rotor. One or more reinforcing bridge portions that connect the two or more non-magnetic path forming portions of each magnetic pole, and the bridge portion on the outer peripheral side of each magnetic pole is formed with the two or more non-magnetic path forming portions. The gist is that on both sides of the part, the magnetic path forming part that is radially outward from the non-magnetic path forming part is connected to the other magnetic path forming part.

  According to this, in a type of rotating electrical machine having a plurality of outer peripheral bridge portions for each magnetic pole and one or more reinforcing bridge portions connecting two non-magnetic path forming portions of each magnetic pole, It is possible to reduce both the amount of magnetic flux leakage that leaks through the bridge portions on the outer peripheral side and the amount of magnetic flux leakage that leaks through the reinforcing bridge portions. Thereby, while being able to obtain a high torque, the reliability of the rotary electric machine at the time of high rotation can be improved.

  The invention according to claim 4 is the rotating electrical machine according to claim 2 or 3, wherein the plurality of non-magnetic path forming portions are embedded in the magnet accommodation hole extending in the axial direction of the rotor and the magnet accommodation hole. Each of the permanent magnets is composed of permanent magnets, and the permanent magnets are arranged so that ends of different magnetic poles are alternately arranged.

  According to this, it is possible to reduce both the magnetic flux leakage amount at which the magnetic flux due to the stator leaks through each bridge portion and the magnetic flux leakage amount at which the magnetic flux due to the permanent magnet leaks through each bridge portion. Thereby, reluctance torque and magnet torque can be used effectively, and high torque can be obtained. In addition, since each permanent magnet is held by the rotor by each bridge portion, each permanent magnet can be held during high rotation, and the reliability of the rotating electrical machine can be improved. Therefore, in an embedded magnet type rotating electrical machine that uses both reluctance torque and magnet torque, high torque can be obtained and reliability can be improved.

  According to a fifth aspect of the present invention, in the rotating electrical machine according to the third aspect, the two or more non-magnetic path forming portions of the magnetic poles are connected at the air gap side and the anti-air gap side is connected at the reinforcing bridge portion. The gist of the present invention is that it is composed of two V-arranged magnet accommodation holes and two permanent magnets embedded in each magnet accommodation hole.

  According to this, a high torque can be realized in an interior magnet type rotating electrical machine that is an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.

The gist of the invention according to claim 6 is the rotating electrical machine according to any one of claims 1 to 5, wherein the rotor core of the rotor is a laminated core in which a plurality of core sheets are laminated.
According to this, in a rotating electrical machine using a rotor core as a laminated core, high torque can be obtained and reliability at high rotation can be improved.

  According to a seventh aspect of the present invention, in the rotating electrical machine according to the sixth aspect, the laminated core includes a plurality of bridge portions on the outer circumferential side provided for each of the magnetic poles on the outer circumferential side of the rotor, and the magnetic poles of the magnetic poles. One type of core sheet obtained by cutting at least one of the one or more reinforcing bridge portions that connect the two or more non-magnetic path forming portions with each other at a predetermined angle is used for each of the bridge portions on the outer peripheral side. The rotor is laminated so that the thickness in the axial direction and the thickness in the axial direction of each of the reinforcing bridge portions are smaller than the other portions, shifted in the rotational direction of the rotor one by one or every plurality. It becomes the summary.

  According to this, the thickness of each of the outer peripheral bridge portions provided for each magnetic pole and the thickness of each of the one or more reinforcing bridge portions connecting two or more non-magnetic path forming portions of each magnetic pole It is possible to easily and at low cost produce a laminated core having a smaller size than other parts by using one kind of core sheet.

The invention according to claim 8 is the rotating electrical machine according to claim 6, wherein the laminated core includes all of the bridge portions on the outer peripheral side and a part or all of the reinforcing bridge portions are cut. Two or more types of core sheets including a core sheet and a second core sheet that has all of the reinforcing bridge portions and a part or all of the bridge portions on the outer peripheral side are cut into each of the bridge portions on the outer peripheral side. The thickness in the axial direction and the thickness in the axial direction of each of the reinforcing bridge portions are alternately stacked one by one or every plurality so that the thickness is smaller than the other portions. And

  According to this, the thickness of each of the outer peripheral bridge portions provided for each magnetic pole and the thickness of each of the one or more reinforcing bridge portions connecting two or more non-magnetic path forming portions of each magnetic pole It is possible to easily produce a laminated core having a smaller size than other parts by using two or more kinds of core sheets including the first core sheet and the second core sheet.

  The invention according to claim 9 is the rotating electrical machine according to any one of claims 6 to 8, wherein the laminated core is fixed by any one of adhesion, rivet caulking, and caulking of the core sheet. This is the gist.

  According to this, by fixing the laminated core by a method such as adhesion, rivet caulking, and caulking of the core sheet, the strength of the rotor core as the laminated core is increased, and it is possible to cope with higher rotation.

The gist of the invention according to claim 10 is the rotating electrical machine according to any one of claims 1 to 5, wherein the rotor core of the rotor is a powder core obtained by sintering a predetermined material.
According to this, in a rotating electrical machine using a rotor core as a powder core, high torque can be obtained and reliability at high rotation can be improved.

  The invention according to claim 11 is the rotating electrical machine according to claim 10, wherein each of the plurality of bridge portions in the powder core is arranged so that the powder core does not completely divide and each of the plurality of bridge portions. The gist is that the cross sections are partially cut so that the cross-sectional areas are equal.

According to this, since each bridge part is partially excised so that the powder core is not completely divided, a powder core (rotor core) having sufficient strength can be obtained.
The gist of the invention according to claim 12 is that, in the rotating electrical machine according to claim 11, both axial sides or one side of each of the plurality of bridge portions in the powder core are cut off.

According to this, the powder core which made the cross-sectional area of each of the some bridge | bridging part smaller than another part can be produced.
The gist of the invention according to claim 13 is that, in the rotating electrical machine according to claim 11, one or more holes are partially formed in the outer peripheral portion of each of the plurality of bridge portions in the powder core.

  According to this, since one or more holes are partially opened in the outer peripheral portion of each bridge portion, a powder core (rotor core) having sufficient strength can be obtained.

  According to the present invention, a high torque can be obtained by reducing the amount of magnetic flux leakage at the bridge portion, and the reliability at the time of high rotation can be improved.

Embodiments of an embedded magnet motor embodying the present invention will be described below with reference to the drawings.
In the description of each embodiment, similar parts are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
The embedded magnet type motor according to the first embodiment will be described with reference to FIGS.
The embedded magnet type motor as a rotating electrical machine shown in FIG. 1 includes a housing 1, a stator 2 in which windings are wound around a plurality of teeth arranged in the circumferential direction, and a rotor 3, and includes magnet torque and reluctance. This is an adder motor that uses torque as rotational torque.

  As shown in FIG. 1, the housing 1 includes a bottomed cylindrical case 4 and a lid 5 that closes an opening of the case 4. The stator 2 is fixed to the inner peripheral surface of the case 4. The rotor 3 is rotatably accommodated inside the stator 2 by supporting the rotating shaft 6 by a bearing 4 a and a bearing 5 a provided on the case 4 and the lid 5, respectively.

  As shown in FIGS. 1 to 3, the stator 2 is formed in a cylindrical shape and includes a stator core 8 having a plurality of teeth 7 formed to extend toward the axis center at equal angles in the circumferential direction, and each tooth 7. And a winding 10 wound through an insulator 9. In addition, the stator of this embodiment is a 12-slot stator having 12 teeth 7. 2 and 3, illustration of the insulator 9 and the winding 10 is omitted. The winding 10 is wound around the tooth 7 by concentrated winding.

  As shown in FIG. 1, the rotor 3 includes an 8-pole rotor including a rotary shaft 6, a rotor core 11, and eight sets of permanent magnets arranged at equal angles in the circumferential direction with two permanent magnets as one set. It has become. The rotor core 11 is a laminated core formed by laminating a plurality of disk-shaped core sheets (see FIGS. 3 and 5A). In addition, illustration of the boundary line of a some core sheet | seat is abbreviate | omitted to the rotor core 11 of the rotor 3 shown in FIG. A central hole 11 a into which the rotary shaft 6 is fitted is formed at the axial center of the rotor core 11.

  As shown in FIGS. 2 and 3, the rotor core 11 of the rotor 3 includes eight sets (two for each magnetic pole in the circumferential direction, 16 in total) and a plurality of ( 2 × 8 = 16) bridge portions 21. Two bridge portions (bridge portions on the outer peripheral side) 21 and 21 of each magnetic pole are formed on the air gap 13 between the stator 2 on both sides of the two non-magnetic path forming portions 12 and 12 of each magnetic pole (each set). The eight magnetic path forming parts 14 on the side closer to the non-magnetic path forming part 12 and the other magnetic path forming parts 15 are connected.

  In this rotor core 11, two bridge portions 21, 21 are formed between two adjacent non-magnetic path forming portions 12, 12 among the 16 non-magnetic path forming portions 12. A total of 16 bridge portions 21 are provided. That is, the rotor core 11 is provided with two bridge parts (outer bridge parts) 21 and 21 every 180 ° (each magnetic pole) in electrical angle in the case of three-phase driving.

  The “air gap 13” is formed at the tip end portion (rotation center side end portion) of each tooth 7 of the stator 2, and the inner peripheral surface of the tip portion 7 a having a wide width in the circumferential direction and the outer peripheral surface of the rotor core 11. It is a gap that can be made between each.

The rotor core 11 of the rotor 3 is configured such that the thickness of each of the plurality of bridge portions 21 is thinner (smaller) than the other portions.
The two non-magnetic path forming portions 12 and 12 of each magnetic pole have a V-shaped arrangement in which the air gap 13 side (radially outer side) is open and the anti-air gap side (radially inner side) is connected by a reinforcing bridge portion 23. One magnet housing hole 16, 17 and two permanent magnets 18 embedded in each magnet housing hole 16, 17.
, 19 are included.

  Each of the permanent magnets 18 and 19 has a rectangular parallelepiped shape, and both end portions in the axial direction of the rotor 3 are magnetic poles. As shown in FIG. 2, the two permanent magnets 18 and 19 of the nonmagnetic path forming portions 12 and 12 in each set are arranged with the same magnetic pole ends in the same set of nonmagnetic path forming portions 12 and 12, respectively. In addition, the two adjacent non-magnetic path forming portions 12 and 12 are embedded in the corresponding magnet housing holes 16 and 17 so that the ends of the different magnetic poles are aligned. That is, the permanent magnets 18 and 19 of a certain set of non-magnetic path forming portions 12 and 12 have N pole ends aligned, and the permanent magnets 18 and 19 of the non-magnetic path forming portions 12 and 12 on both sides thereof. Are arranged so that the ends of the S poles are aligned, and eight sets of permanent magnets 18 and 19 are arranged as one set. Thus, the 8-pole rotor 3 is configured.

  The eight magnetic path forming portions 14 are triangular magnetic regions formed between two V-arranged magnet receiving holes 16 and 17. The other magnetic path forming portion 15 is a magnetic region formed radially inward from the eight sets of magnet housing holes 16 and 17.

  Thus, the embedded magnet type motor according to the present embodiment includes two non-magnetic path forming portions 12 that are independently V-shaped along the circumferential direction for each magnetic pole. In addition, the rotor 3 includes a plurality of bridge portions on the outer peripheral side, two outer peripheral bridge portions 21 provided for each magnetic pole, and two non-magnetic path forming portions 12 and 12 of each magnetic pole. One reinforcing bridge portion 23 to be connected is provided. The bridge portions 21 and 21 on the outer peripheral side of each magnetic pole are on both sides of the two non-magnetic path forming portions 12 and 12, and the magnetic path forming portion 14 and other magnetic path forming on the radially outer side from the non-magnetic path forming portions. The unit 15 is connected.

  The feature of the embedded magnet type motor according to the present embodiment is that the thickness of each of the plurality of bridge portions 21 in the rotor core 11 of the rotor 3 is made thinner than the other portions. In order to obtain this configuration, as a plurality of disk-shaped core sheets constituting the rotor core 11 that is a laminated core, one type of core sheet obtained by cutting 16 bridge portions 21 at every electrical angle of 360 ° (predetermined angle). 25 (see FIG. 4).

  In this core sheet 25, as shown in FIG. 4, two bridge portions 21A and 21A and two openings 21B and 21B formed by cutting the two bridge portions are alternately provided at every electrical angle of 180 °. It has been. As shown in FIGS. 5 (a) and 5 (b), one kind of core sheet 25 having such a shape is arranged in the axial direction of each of the 16 bridge portions 21 in the rotor core 11 (the direction perpendicular to the paper surface in FIG. 3). The rotor core 11 is configured by laminating the rotor 3 in the rotational direction of the rotor 3 so as to be equal to each other and thinner than the other portions by shifting by an electrical angle of 180 °.

  By laminating each core sheet 25 with an electrical angle of 180 ° shifted in the rotation direction of the rotor 3, two bridge portions 21A, 21A and openings 21B, 21B obtained by cutting the bridge portions in the laminated core sheets 25, (See FIGS. 5A and 5B). In the rotor core 11 (rotor 3) produced in this way, the thickness of each of the 16 bridge portions 21 is thinner than the other portions.

  5A and 5B, only four core sheets 25 are shown for simplification of illustration, the number is not limited to “4”. 2 to 5, reference numeral 26 denotes a rivet (not shown) when the rotor core 11 is manufactured by laminating a plurality of core sheets 25 and then fixing these core sheets 25 by rivet caulking. It is a through hole provided in each core sheet 25 for insertion.

According to 1st Embodiment comprised as mentioned above, there exist the following effects.
O Since the thickness of each of the plurality of bridge portions 21 in the rotor core 11 of the rotor 3 is made thinner than the other portions, the magnetic resistance in each bridge portion 21 becomes large. Thereby, both the amount of magnetic flux leakage by which the magnetic flux by the stator 2 leaks through each bridge part 21 and the amount of magnetic flux leakage by which the magnetic flux by the permanent magnets 18 and 19 leaks through each bridge part 21 can be reduced. Therefore, both reluctance torque and magnet torque can be used effectively, and high torque can be obtained (see FIG. 13).

  FIG. 13 shows torque characteristics when the conventional embedded magnet type motor shown in FIG. 14 and the embedded magnet type motor according to the first embodiment are driven with the same exciting current. In FIG. 13, a curve 31 indicates the torque obtained by the conventional embedded magnet type motor, and a curve 32 indicates the torque of the embedded magnet type motor according to the present embodiment. In addition, the torque shown by each curve 31 and 32 has shown the torque which added reluctance torque and magnet torque.

As is apparent from FIG. 13, the embedded magnet type motor according to this embodiment can obtain a higher torque than the conventional embedded magnet type motor.
The plurality of bridge portions 21 in the rotor core 11 have a structure in which the magnetic path forming portions 14 on the side closer to the air gap 13 than the respective non-magnetic path forming portions 12 are respectively held by the rotor core 11. For this reason, it becomes possible to hold | maintain each magnetic path formation part 14 at the time of high rotation, and can improve the reliability of an embedded magnet type motor at the time of high rotation.

  ○ Since the permanent magnets 18 and 19 are held by the rotor core 11 by the bridge portions 21 and 21, respectively, the permanent magnets 18 and 19 can be held at a high speed, and the reliability of the rotating electrical machine Can be increased. Therefore, high torque can be realized in an embedded magnet type motor that uses both reluctance torque and magnet torque.

  The rotor 3 is housed rotatably inside the stator 2. Further, the eight sets of non-magnetic path forming portions 12 are constituted by the two V-arranged magnet receiving holes 16 and 17 and the two permanent magnets 18 and 19, respectively. The two permanent magnets 18 and 19 of the nonmagnetic path forming portions 12 and 12 of each set are arranged with the same magnetic pole ends in the same nonmagnetic path forming portion 12 and adjacent sets of nonmagnetic paths. In the path forming portion 12, the end portions of different magnetic poles are embedded in the corresponding magnet housing holes 16 and 17 so that they are aligned. With such a configuration, a high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.

In the embedded magnet type motor in which the rotor core 11 of the rotor 3 is a laminated core, high torque can be obtained and the reliability at high rotation can be improved.
○ As a plurality of core sheets constituting the rotor core 11, two bridge portions 21A and 21A and two openings 21B and 21B formed by cutting the two bridge portions are alternately provided at every electrical angle of 180 °. One type of core sheet 25 is used. The core sheets 25 are stacked by being shifted by one electrical angle of 180 ° in the rotation direction of the rotor 3 so that the thicknesses of the bridge portions 21 in the rotor core 11 in the axial direction are equal and thinner than other portions. Thus, the rotor core 11 is configured. Therefore, a laminated core in which the thickness of each bridge portion 21 is made thinner than other portions can be easily produced at a low cost by using one kind of core sheet 25.

-After laminating | stacking the several core sheet 25, the intensity | strength of the rotor core 11 can be improved by producing the rotor core 11 by fixing these core sheets 25 by rivet caulking.

(Second Embodiment)
Next, an embedded magnet type motor according to a second embodiment will be described with reference to FIGS. 6-8, illustration of each permanent magnet 18 and 19 embedded in each magnet accommodation hole 16 and 17 is abbreviate | omitted.

  In this embodiment, the rotor core 11A as a laminated core has a plurality of (2 × 8 = 16) outer peripheral bridge portions 21A and a first core sheet in which all of the reinforcing bridge portions 23 are cut. 35 and two types of core sheets, ie, a second core sheet 45 having all of the reinforcing bridge portion 23 and cutting all of the outer peripheral bridge portion 21A are used.

  In the first core sheet 35, as shown in FIG. 7, two bridge portions 21A and 21A are provided at eight locations every electrical angle of 180 °. Further, the first core sheet 35 has a configuration in which the reinforcing bridge portion 23 is cut away.

  On the other hand, in the second core sheet 45, as shown in FIG. 8, two openings 21B and 21B formed by cutting two bridge portions are provided at eight positions every electrical angle of 180 °. In addition, the second core sheet 45 is provided with all of the reinforcing bridge portions 23 that connect the opposite air gap side (radially inner side) of the two magnet housing holes 16 and 17 of the V-shaped arrangement at each magnetic pole. Yes.

  The rotor core 11A includes two types of core sheets 35 and 45, one by one so that the thicknesses in the axial direction of the bridge portions 21 and the reinforcing bridge portions 23 on the outer peripheral sides are thinner than the other portions. A plurality of layers are alternately stacked. That is, as shown in FIGS. 6A and 6B, the two types of core sheets 35 and 45 are such that each bridge portion 21 </ b> A of the core sheet 35 and each opening portion 21 </ b> B of the core sheet 45 coincide with each other. A plurality of sheets 35 are alternately laminated so that the portion of the sheet 35 without the reinforcing bridge portion 23 and the reinforcing bridge portion 23 of the core sheet 45 coincide with each other. In FIGS. 6A and 6B, four types of core sheets 35 and 45 are stacked for the sake of simplicity, but the number of stacked sheets is not limited to “4”.

According to 2nd Embodiment comprised as mentioned above, in addition to the effect which the said 1st Embodiment show | plays, there exist the following effects.
A rotor core 11A in which the thickness of the bridge portion 21 on each outer peripheral side is made thinner than other portions, a first core sheet 35 having all the bridge portions 21A and cutting all the reinforcing bridge portions 23, and reinforcement It can be easily manufactured by using two types of core sheets, ie, the second core sheet 45 having all of the bridge portions 23 and cutting all of the bridge portions 21A.

  The rotor core 11A is formed by alternately stacking the first core sheet 35 (see FIG. 7) and the second core sheet 45 (see FIG. 8) as shown in FIGS. Configured. Accordingly, not only the thickness of each of the plurality of bridge portions 21 on the outer peripheral side in the rotor core 11A of the rotor 3 but also the thickness of each of the plurality of reinforcement bridge portions 23 is thinner than the other portions. The amount of magnetic flux leakage leaking through can also be reduced. Therefore, higher torque can be obtained.

(Third embodiment)
Next, an embedded magnet type motor according to a third embodiment will be described with reference to FIGS.
As shown in FIGS. 9 and 10, the embedded magnet type motor according to the present embodiment has a cross-sectional area of each of the plurality of outer peripheral bridge portions 21 and a cross-sectional area of each of the plurality of reinforcing bridge portions 23. The rotor 3 is made smaller than the portion. The rotor core 11B of the rotor 3 is composed of a powder core obtained by sintering a predetermined material.

  In this rotor core 11B (powder rotor), in order to make the cross-sectional areas of the bridge portions 21 and the reinforcing bridge portions 23 smaller than other portions, the rotor cores 11B are completely formed of the bridge portions 21 and the reinforcing bridge portions 23. The bridge portions 21 and the reinforcing bridge portions 23 are partially cut away so that the cross-sectional areas are equal to each other.

  In this embodiment, the axial direction both sides of each bridge part 21 in the rotor core 11B are excised with the same depth, and the cross-sectional area of each bridge part 21 is made smaller than other parts. That is, grooves 21C having the same depth are provided on both sides in the axial direction of each bridge portion 21 in the rotor core 11B. Further, both sides in the axial direction of each reinforcing bridge portion 23 in the rotor core 11B are cut at the same depth as shown in FIG. 11 so that the cross-sectional area of each reinforcing bridge portion 23 is smaller than the other portions. That is, grooves 23C having the same depth are provided on both axial sides of each reinforcing bridge portion 23 in the rotor core 11B.

  Similarly to the first embodiment, the rotor core 11B of the rotor 3 includes two V-arranged magnet housing holes 16 and 17 provided at eight equal angles in the circumferential direction, and each magnet housing hole 16, The two permanent magnets 18 and 19 embedded in 17 constitute eight sets (two for each magnetic pole, a total of 16) of non-magnetic path forming portions 12. 9 and 10, the permanent magnets 18 and 19 are not shown.

According to 3rd Embodiment comprised as mentioned above, there exist the following effects.
O Since the cross-sectional area of each of the plurality of bridge portions 21 in the rotor core 11B of the rotor 3 is made smaller than that of the other portions, the magnetic resistance in each bridge portion 21 is increased. At the same time, since the cross-sectional area of each of the plurality of reinforcing bridge portions 23 in the rotor core 11B is made smaller than that of the other portions, the magnetic resistance in each reinforcing bridge portion 23 is also increased. Thereby, both reluctance torque and magnet torque can be used effectively, and high torque can be obtained.

  A structure in which each magnetic path forming portion 14 on the side closer to the air gap 13 (see FIG. 2) than each non-magnetic path forming portion 12 is held by the rotor core 11B by the plurality of bridge portions 21 in the rotor core 11B. It has become. For this reason, it becomes possible to hold | maintain each magnetic path formation part 14 at the time of high rotation, and can improve the reliability of an embedded magnet type motor at the time of high rotation.

A high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.
In the embedded magnet type motor in which the rotor core 11B of the rotor 3 is a powder core, high torque can be obtained and the reliability at high rotation can be improved.

Since each bridge portion 21 is partially cut away so that the rotor core 11B is not completely divided, the rotor core 11B having sufficient strength can be obtained.
○ By cutting off both sides in the axial direction of each bridge portion 21 on the outer peripheral side and both sides in the axial direction of each reinforcing bridge portion 23 at the same depth, the cross-sectional area of each bridge portion 21 and each reinforcing bridge portion 23 A rotor core 11B having a smaller cross-sectional area than other portions can be manufactured.

(Fourth embodiment)
Next, an embedded magnet type motor according to a fourth embodiment will be described with reference to FIG.
As shown in FIG. 12, the interior magnet motor according to the present embodiment includes a rotor 3 in which the cross-sectional area of each of a plurality of bridge parts (outer bridge parts) 21 is smaller than the other parts. The rotor core 11C of the rotor 3 is composed of a powder core obtained by sintering a predetermined material.

  In this rotor core 11C (powder rotor), in order to make the cross-sectional area of each bridge portion 21 smaller than the other portions, each bridge portion 21 is separated from each other so that the rotor core 11C is not completely divided. Partially cut out so that the areas are equal.

  In the present embodiment, a plurality of (five in this example) holes 21D are formed in the outer peripheral portion of each bridge portion 21 in the rotor core 11C, so that the cross-sectional area of each bridge portion 21 is smaller than the other portions. In the outer peripheral portion of each bridge portion 21, five holes 21D are formed at an equal pitch. These holes 21D have the same shape and the same size.

  Further, similarly to the first embodiment, the rotor core 11C of the rotor 3 has two V-arranged magnet housing holes 16 and 17 provided at eight equal angles in the circumferential direction, and each magnet housing hole 16, The two permanent magnets 18 and 19 embedded in 17 constitute eight sets of non-magnetic path forming portions 12. In FIG. 11, the permanent magnets 18 and 19 are not shown.

According to 4th Embodiment comprised as mentioned above, there exist the following effects.
○ Similar to the third embodiment, both reluctance torque and magnet torque can be used effectively, high torque can be obtained, and the reliability of the embedded magnet motor at high revolutions can be improved. Can do.

A high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.
In the embedded magnet type motor using the rotor core 11C as a powder core, high torque can be obtained and the reliability at high rotation can be improved.

  A rotor core 11C in which the cross-sectional area of each bridge portion 21 is smaller than the other portions can be produced by opening a plurality (five) holes 21D in the outer peripheral portion of each bridge portion 21 in the rotor core 11C.

O Since the holes 21D are partially opened in the outer peripheral portion of each bridge portion 21, a rotor core 11C having sufficient strength can be obtained.
In addition, this invention can also be changed and embodied as follows.

  In each of the embodiments described above, an embedded magnet motor that uses both reluctance torque and magnet torque has been described as an example of a rotating electrical machine that uses reluctance torque. However, the present invention is also applicable to a reluctance motor that uses only reluctance torque. Is possible.

  That is, the present invention includes a stator and a rotor in which windings are wound around a plurality of teeth, and the rotor includes a plurality of non-magnetic path forming portions arranged in the circumferential direction, and both sides of each non-magnetic path forming portion. Thus, the present invention can be applied to a reluctance motor including a magnetic path forming portion closer to the air gap between the stator and the non-magnetic path forming portion and a plurality of bridge portions connecting the other magnetic path forming portions. is there.

  In such a reluctance motor, the plurality of non-magnetic path forming portions are embedded with a plurality of holes of an arbitrary shape arranged at equal angles in the circumferential direction in the rotor, or a non-magnetic material embedded in the plurality of holes. It consists of a magnetic barrier layer.

  In each of the above-described embodiments, an internal rotation type embedded magnet type motor has been described as an example of a rotating electrical machine. However, the present invention can also be applied to an external rotation type embedded magnet type motor or a reluctance motor.

  In each of the above embodiments, as an example of a rotating electrical machine, an embedded magnet type motor in which a plurality of permanent magnets arranged in a circumferential direction on a rotor is V-shaped has been described. However, the present invention is also applicable to an embedded magnet type motor including a rotor in which a plurality of permanent magnets having an arbitrary shape such as a linear shape, an arc shape, or a U shape are arranged in the circumferential direction.

  Similarly, the present invention is also applicable to a reluctance motor including a rotor in which a plurality of non-magnetic path forming portions having an arbitrary shape such as a linear shape, an arc shape, or a U shape are arranged in the circumferential direction. . For example, the present invention connects a motor having a bridge portion only on the outer peripheral side of the rotor, a plurality of outer peripheral bridge portions for each magnetic pole, and two non-magnetic path forming portions of each magnetic pole. The present invention can be widely applied to a type of motor having one reinforcing bridge portion.

  -Furthermore, the present invention can be applied to a motor having a bridge portion only on the outer peripheral side of the rotor and having a plurality of non-magnetic path forming portions at different positions in the radial direction for each magnetic pole. is there. For example, in a motor in which two or more non-magnetic path forming portions are provided at different positions in the radial direction for each magnetic pole, four or more outer peripheral bridge portions are provided for each magnetic pole on the outer peripheral side of the rotor. become. The present invention can also be applied to a motor having such a configuration.

  In each of the above embodiments, the rotor 3 connects two non-magnetic path forming portions 12 provided independently along the circumferential direction for each magnetic pole, and the two non-magnetic path forming portions 12 of each magnetic pole. The configuration including one reinforcing bridge portion 23 is described as an example. However, according to the present invention, the rotor includes two or more non-magnetic path forming portions provided independently along the circumferential direction for each magnetic pole, and two or more non-magnetic paths provided for each magnetic pole. The present invention is also applicable to a motor including one or more reinforcing bridge portions that connect magnetic path forming portions.

  In each of the above embodiments, the thickness or cross-sectional area of each of the bridge portions on the outer peripheral side and the thickness or cross-sectional area of each of the reinforcing bridge portions may be the same or different. However, it is desirable that the thickness or the cross-sectional area of each bridge portion on the outer peripheral side is equal, and that the thickness or the cross-sectional area of each reinforcing bridge portion is equal.

  In each of the embodiments described above, the embedded magnet type motor including the 12-slot stator and the 8-pole rotor 3 has been described. However, the embedded magnet type motor in which the number of stator slots and the number of rotor poles are appropriately changed. In addition, the present invention is applicable.

  In each of the above embodiments, an embedded magnet type motor has been described as an example of a rotating electrical machine. However, the present invention can be applied not only to an embedded magnet type motor and a reluctance motor, but also to a generator. That is, the present invention includes a stator and a rotor in which windings are wound around a plurality of teeth, and the rotor includes a plurality of non-magnetic path forming portions arranged in the circumferential direction, and both sides of each non-magnetic path forming portion. Therefore, it can also be applied to a generator including a magnetic path forming part on the side closer to the air gap between the stator and the non-magnetic path forming part, and a plurality of bridge parts connecting other magnetic path forming parts. is there.

  In the first embodiment, as the plurality of core sheets 25 constituting the rotor core 11, the two bridge portions 21A and 21A and the two openings 21B and 21B formed by cutting the two bridge portions are electrical angles. One type of core sheet provided alternately every 180 ° is used. However, the present invention can be applied to a configuration using one type of core sheet obtained by cutting a plurality of bridge portions 21 at predetermined angles other than an electrical angle of 180 °.

In the first embodiment, the rotational direction of the rotor 3 is adjusted so that one type of core sheet 25 is equal in thickness in the axial direction of each of the 16 bridge portions 21 in the rotor core 11 and thinner than the other portions. The rotor core 11 is configured by laminating the sheets one by one by an electrical angle of 180 °. However, in the present invention, one core sheet 25 is rotated by an electrical angle of 180 ° in the rotation direction for each of the plurality of sheets so that the thicknesses of the bridge portions 21 in the axial direction are equal and thinner than the other portions. The present invention can also be applied to a configuration in which layers are stacked while being shifted.

  In the first embodiment, the two bridge portions 21A and 21A and the two openings 21B and 21B formed by cutting the two bridge portions are alternately provided at every electrical angle of 180 °. The core sheet is used. However, in the present invention, the two bridge portions 21A, 21A and the two openings 21B, 21B are also used in a configuration using one type of core sheet in which the electrical angles other than 180 ° are alternately provided. Applicable.

  In the second embodiment, the rotor core 11A includes two types of core sheets 35 and 45, each having a different thickness in the axial direction of the bridge portion 21 on the outer peripheral side and a thickness in the axial direction of each reinforcing bridge portion 23. A plurality of sheets are alternately laminated so as to be thinner than the portion. However, according to the present invention, two or more types of core sheets including the core sheets 35 and 45 are arranged so that the thicknesses in the axial direction of the bridge portions 21 and the reinforcing bridge portions 23 are thinner than the other portions. The present invention can also be applied to a rotating electrical machine including a rotor core that is alternately stacked for every sheet or for every plurality of sheets.

  -In the said 2nd Embodiment, it may replace with the 1st core sheet 35 which cut | disconnected all the reinforcement bridge parts 23, and may use the 1st core sheet which cut | disconnected a part, and the bridge part of the outer peripheral side Instead of the second core sheet 45 obtained by cutting the entire 21A, a second core sheet obtained by cutting a part thereof may be used.

  In the third embodiment, both sides in the axial direction of each bridge portion 21 in the rotor core 11B are cut out at the same depth, but the present invention is also applicable to a configuration in which one side in the axial direction of each bridge portion 21 is cut out at the same depth. Is applicable.

In the fourth embodiment, five holes 21D are formed in the outer peripheral portion of each bridge portion 21 in the rotor core 11C, but the number of the holes 21D is not limited to “5” and can be changed as appropriate.
In the fourth embodiment, five holes 21D are formed at equal pitches in the outer peripheral portion of each bridge portion 21 in the rotor core 11C, but the axial cross-sectional areas of the respective bridge portions 21 are the same. If it becomes, this invention is applicable also to the structure by which the several hole 21D is drilled with an unequal pitch.

1 is a longitudinal sectional view showing a schematic configuration of an embedded magnet type motor according to a first embodiment. The top view which shows the stator and core of the motor. The perspective view which shows the stator and core of the motor. The top view which shows the core sheet which comprises the rotor of the motor. (A) The perspective view which shows the laminated structure of the rotor, (b) The exploded perspective view of the rotor. (A) The perspective view which shows the laminated structure of the rotor in the interior magnet type motor which concerns on 2nd Embodiment, (b) The exploded perspective view of the rotor. The top view which shows the 1st core sheet | seat used by 2nd Embodiment. The top view which shows the 2nd core sheet used in the embodiment. The perspective view which shows the rotor of the interior magnet type motor which concerns on 3rd Embodiment. The top view which shows the rotor. Sectional drawing along the AA line of FIG. The perspective view which shows the rotor of the interior magnet type motor which concerns on 4th Embodiment. FIG. 15 is a graph for comparing the torque characteristics of the embedded magnet type motor according to the first embodiment and the conventional embedded magnet type motor shown in FIG. 14. The perspective view which shows the conventional embedded magnet type | mold motor. The top view which shows another prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Stator, 3 ... Rotor, 7 ... Teeth, 10 ... Winding, 11, 11A, 11B, 11C ... Rotor core, 12 ... Non magnetic path formation part, 13 ... Air gap, 14, 15 ... Magnetic path formation part, 16 , 17 ... Magnet housing holes, 18, 19 ... Permanent magnets, 21, 21A ... Bridge portion on the outer peripheral side, 21D ... Hole, 23 ... Reinforced bridge portion, 25, 35, 45 ... Core sheet, 35 ... First core sheet 45 ... Second core sheet.

Claims (13)

In a rotating electrical machine that includes a stator wound with a plurality of teeth arranged in a circumferential direction and a rotor, and uses reluctance torque,
The rotor includes a plurality of non-magnetic path forming portions arranged in the circumferential direction, a magnetic path forming portion on the side closer to the air gap between the stator and the non-magnetic path forming portion, and other magnetic path forming portions. And a plurality of bridge parts for connecting
A rotating electrical machine, wherein a thickness or a cross-sectional area of each of the plurality of bridge portions is smaller than that of other portions. In the rotating electrical machine according to claim 1,
The rotor is rotatably accommodated inside the stator, and each of the plurality of non-magnetic path forming portions includes at least one non-magnetic path forming portion that is provided for each magnetic pole and that is continuous in the circumferential direction. ,
The plurality of bridge portions include a plurality of outer periphery side bridge portions provided for each magnetic pole on the outer periphery side of the rotor, and the outer periphery side bridge portion of each magnetic pole is the at least one non-magnetic path forming portion. A rotating electrical machine characterized by connecting a magnetic path forming portion radially outside the non-magnetic path forming portion and other magnetic path forming portions on both sides of the rotating electric machine. In the rotating electrical machine according to claim 1,
The rotor is rotatably accommodated inside the stator, and each of the plurality of non-magnetic path forming portions is two or more non-magnetic paths provided independently along the circumferential direction for each magnetic pole. Including a forming part,
The plurality of bridge portions include one or more reinforcements that connect a plurality of outer peripheral bridge portions provided for each of the magnetic poles on the outer peripheral side of the rotor, and the two or more non-magnetic path forming portions of the magnetic poles. A bridge portion on the outer peripheral side of each of the magnetic poles on both sides of the two or more non-magnetic path forming portions, a magnetic path forming portion that is radially outward from the non-magnetic path forming portions, and others A rotating electrical machine characterized by connecting a magnetic path forming part of the rotating electrical machine. In the rotating electrical machine according to claim 2 or 3,
The plurality of non-magnetic path forming portions are each composed of a magnet accommodation hole extending in the axial direction of the rotor and a permanent magnet embedded in the magnet accommodation hole, and the end portions of different magnetic poles are alternately arranged in the permanent magnet. A rotating electrical machine characterized by being arranged in a row. In the rotating electrical machine according to claim 3,
The two or more non-magnetic path forming portions of each of the magnetic poles include two V-shaped magnet receiving holes in which the air gap side is open and the anti-air gap side is connected by the reinforcing bridge portion, and in each magnet receiving hole. A rotating electric machine comprising two embedded permanent magnets. In the rotating electrical machine according to any one of claims 1 to 5,
The rotor core of the rotor is a laminated core in which a plurality of core sheets are laminated. In the rotating electrical machine according to claim 6,
The laminated core includes at least one bridge portion on the outer peripheral side provided for each magnetic pole on the outer peripheral side of the rotor, and one or more non-magnetic path forming portions of the magnetic poles. One type of core sheet obtained by cutting at least one of the reinforcing bridge portions at a predetermined angle, and a thickness in the axial direction of each of the bridge portions on the outer peripheral side and a thickness in the axial direction of each of the reinforcing bridge portions The rotating electrical machine is characterized in that the rotating electrical machines are stacked one by one in the rotational direction of the rotor so as to be smaller than the other parts. In the rotating electrical machine according to claim 6,
The laminated core has a first core sheet having all of the bridge portions on the outer peripheral side and a part or all of the reinforcing bridge portions, and all of the reinforcing bridge portions and having the outer peripheral side. Two or more types of core sheets including a second core sheet obtained by cutting a part or all of the bridge portion, the thickness in the axial direction of each of the bridge portions on the outer peripheral side, and the axial direction of each of the reinforcing bridge portions A rotating electrical machine characterized by being alternately stacked one by one or a plurality of sheets so that each thickness is smaller than the other portions. In the rotating electrical machine according to any one of claims 6 to 8,
The rotating electrical machine, wherein the laminated core is fixed by any one of adhesion, rivet caulking, and caulking of the core sheet. In the rotating electrical machine according to any one of claims 1 to 5,
The rotating electric machine according to claim 1, wherein the rotor core of the rotor is a powder core obtained by sintering a predetermined material. The rotating electrical machine according to claim 10,
Each of the plurality of bridge portions in the powder core is partially cut so that the powder core is not completely divided and the cross-sectional areas of the plurality of bridge portions are equal to each other. Rotating electric machine. The rotating electrical machine according to claim 11,
A rotating electrical machine wherein the powder core is cut off on both sides or one side in the axial direction of each of the plurality of bridge portions. The rotating electrical machine according to claim 11,
In the powder core, one or more holes are partially formed in an outer peripheral portion of each of the plurality of bridge portions.

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