CN111989843B - Rotor and rotating electrical machine provided with same - Google Patents
Rotor and rotating electrical machine provided with same Download PDFInfo
- Publication number
- CN111989843B CN111989843B CN201980019937.4A CN201980019937A CN111989843B CN 111989843 B CN111989843 B CN 111989843B CN 201980019937 A CN201980019937 A CN 201980019937A CN 111989843 B CN111989843 B CN 111989843B
- Authority
- CN
- China
- Prior art keywords
- rotor
- permanent magnets
- rotor core
- magnet
- magnet housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Provided are a rotor which improves the demagnetizing force of a permanent magnet and effectively uses the magnetic flux of the magnet to improve the motor performance, and a rotary electric machine using the rotor. A rotor in which a plurality of permanent magnets (110 a, 110 b) are housed in 1 magnet housing sections (103) provided in a rotor core (102) is arranged such that the surfaces (113 a, 113 b) of the magnet housing sections (103) located on the outer peripheral side of the rotor core (102) are stepped, and such that the distances (D1 and D2, and P1 and P2) from the outer peripheral surface of the rotor core (102) are equal.
Description
Technical Field
The present invention relates to a rotor and a rotary electric machine provided with the same.
Background
In the automobile industry, there is also an increasing awareness of global environmental protection, and there is a growing shift from conventional internal combustion engine driving to motorization based on a motor that does not emit greenhouse gases during driving. As motors for automobiles, permanent magnet synchronous motors are mainly used for achieving high efficiency. As the permanent magnet, a rare earth magnet that generates a strong magnetic force is used. Rare earth magnets have a weak point of not being heat-resistant, and therefore heavy rare earth magnets are added. However, heavy rare earth is rare and the distribution of the production place is uneven, so that the supply risk is high. Accordingly, a permanent magnet synchronous motor is required to reduce the amount of heavy rare earth elements used and to improve the demagnetizing force resistance of the magnet.
As a technique for suppressing demagnetization of a permanent magnet, for example, patent literature 1 is known. In patent document 1, a pair of permanent magnet storage sections for storing permanent magnets are formed in a V-shape, and two permanent magnets are arranged in each permanent magnet storage section. Each permanent magnet housing portion is formed in a stepped shape, and two permanent magnets are housed as steps. A gap is formed in the rotor core on the outer peripheral side of the permanent magnet housing portion. In addition, a bridge is formed between the permanent magnet housing portions. The permanent magnets on the bridge side among the permanent magnets arranged in the permanent magnet storage section are arranged further toward the outer periphery of the rotor than the storage positions of the permanent magnets on the opposite side to the bridge. The permanent magnets located on the gap side are separated from the outer periphery of the rotor core, and demagnetization of the permanent magnets due to demagnetizing fields from the coils concentrated on the outer peripheral surface side of the gap portion is suppressed. In addition, the motor torque is improved by bringing the permanent magnets on the bridge side close to the outer periphery of the rotor.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2014-171372
Disclosure of Invention
Problems to be solved by the invention
However, in patent document 1, the permanent magnets on the bridge side among the permanent magnets accommodated in the permanent magnets are positioned closer to the outer periphery of the rotor than the accommodated position of the permanent magnets on the opposite side to the bridge, and the motor torque is improved. As a result, there is a problem that the magnetic flux of the magnet, which does not contribute to the generation of the motor torque, increases, and thus the characteristics of the motor deteriorate.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor that improves the anti-demagnetizing force of a permanent magnet and that effectively uses the magnetic flux of the permanent magnet to improve the motor performance, and a rotary electric machine using the rotor.
Means for solving the problems
In order to achieve the above object, a rotor according to the present invention is a rotor in which a plurality of permanent magnets are accommodated in 1 magnet accommodating portions provided in a rotor core, wherein the plurality of permanent magnets are arranged such that a surface on an outer peripheral side of the rotor core is stepped, and such that distances from the outer peripheral surface of the rotor core are equal.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a rotor which improves the demagnetizing force of a permanent magnet and effectively uses the magnetic flux of the permanent magnet to improve the performance of a motor, and a rotary electric machine using the rotor.
Drawings
Fig. 1 is a sectional view of a rotary electric machine according to embodiment 1 of the present invention cut in the radial direction.
Fig. 2 is a partial enlarged view of the magnet housing part in fig. 1.
Fig. 3 is a partial enlarged view of one of the magnet housing portions in fig. 2.
Fig. 4 is a partial enlarged view of a magnet housing portion according to embodiment 2 of the present invention.
Fig. 5 is a partial enlarged view of one of the magnet housing parts in fig. 4.
Fig. 6 is a partial enlarged view of a magnet housing portion according to embodiment 3 of the present invention.
Fig. 7 is a partial enlarged view of a magnet housing portion according to embodiment 4 of the present invention.
Fig. 8 is a partial enlarged view of a magnet housing portion according to embodiment 5 of the present invention.
Detailed Description
Hereinafter, an embodiment of a rotating electrical machine according to the present invention will be described with reference to the drawings. The present invention is not limited to the following examples, and various modifications and applications are included in the scope of the technical concept of the present invention.
Example 1
Embodiment 1 of the present invention will be described. Fig. 1 is a sectional view of a rotary electric machine according to embodiment 1 of the present invention cut in the radial direction. The rotary electric machine 10 includes a rotor 100, a shaft 101 fixed to the rotor 100, and a stator 500 disposed around the rotor 100. The rotary electric machine 10 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, and has both a function as a motor that is supplied with electric power to rotate the shaft 101 and a function as a generator that generates electric power by the rotation of the shaft 101, and can be used in a switching manner according to the running state of the vehicle.
The shaft 101 is a rod-shaped member penetrating the center of the rotor 100, and is fixed to the rotor 100 to rotate integrally with the rotor 100. The rotor 100 includes a rotor core 102 formed by stacking a plurality of electromagnetic steel plates in the rotation axis direction, and a plurality of magnet housing portions 103 and 104 formed to penetrate the rotor core 102 in the rotation axis direction. As the electromagnetic steel sheet constituting the rotor core 102, for example, an electromagnetic steel sheet obtained by processing an electromagnetic steel sheet having a thickness of about 0.05mm to 1mm into a predetermined shape by punching or etching can be used.
A bridge 105 is formed between the magnet housing 103 and the magnet housing 104. The pair of magnet housing portions 103 and 104 are provided to the rotor core 102 so as to be adjacent to each other with a bridge therebetween. The magnet housing 103 and the magnet housing 104 house permanent magnets having a rectangular shape, which will be described later. The magnet housing 103 and the magnet housing 104 have shapes corresponding to the permanent magnets, and are formed slightly larger than the permanent magnets. An adhesive is filled between the magnet housing portions 103 and 104 and the permanent magnets, and is used to fix the permanent magnets to the magnet housing portions 103 and 104. The adhesive covers the outer surfaces of the permanent magnets, and relieves stress acting between the permanent magnets and the rotor core 102 due to centrifugal force during rotation of the rotor core 102.
The stator 500 includes a cylindrical stator core 501, a plurality of slots 502 provided in the stator core 501, and a plurality of coils 503 disposed in the slots 502. The stator core 501 is configured, for example, as follows: electromagnetic steel sheets having a thickness of about 0.05mm to 1mm are processed into a substantially annular predetermined shape by punching or etching, and the electromagnetic steel sheets processed into the predetermined shape are laminated.
Next, the configuration of the permanent magnet disposed in the magnet housing portion will be described with reference to fig. 2 and 3. Fig. 2 is a partial enlarged view of the magnet housing portion in fig. 1, showing a configuration of 1 pole in the rotor of the rotating electrical machine. Fig. 3 is a partial enlarged view of one of the magnet housing portions in fig. 2.
The surfaces 113a and 113b of the magnet housing 103 on the outer peripheral side of the rotor core 102 are offset in a direction passing through the center line 106 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 113a is on an extension of the orthogonal line 107a orthogonal to the center line 106 passing through the rotation center of the shaft 101 (rotor 100), and the surface 113b is on an extension of the orthogonal line 107b orthogonal to the center line 106 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 107b is arranged so as to be offset from the orthogonal line 107a on the center line 106 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 113b is provided so as to protrude from the surface 113a on the outer peripheral side of the rotor core 102 in the direction of the center line 106. The surface 113c of the magnet housing 103 on the shaft 101 side is not stepped.
In the magnet housing 104, the surfaces 114a and 114b on the outer peripheral side of the rotor core 102 are offset in a direction passing through the center line 106 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 114a is on an extension of the orthogonal line 107a that is orthogonal to the center line 106 passing through the rotation center of the shaft 101 (rotor 100), and the surface 114b is on an extension of the orthogonal line 107b that is orthogonal to the center line 106 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 107b is arranged so as to be offset from the orthogonal line 107a on the center line 106 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 114b is provided so as to protrude from the surface 114a on the outer peripheral side of the rotor core 102 in the direction of the center line 106. The surface 114c of the magnet housing 104 on the shaft 101 side is not stepped.
The surface 113a forms a part of the magnet housing 103a, and the surface 113b forms a part of the magnet housing 103 b. Similarly, the surface 114a forms a portion of the magnet housing 104a and the surface 114b forms a portion of the magnet housing 104 b.
Here, the distance between the surface 113a and the surface 113b (the orthogonal line 107a and the orthogonal line 107 b) is preferably larger than the difference between the minimum value of the dimensional tolerance of the permanent magnet 110b and the maximum value of the dimensional tolerance between the surface 113b and the surface 113c of the magnet housing 103 b. Thus, all of the 4 surfaces around the permanent magnet 110b are in contact with the inner wall (each surface) of the magnet housing 103b, and positioning in the magnet housing 103b is facilitated. Similarly, the distance between the surface 114a and the surface 114b (the orthogonal line 107a and the orthogonal line 107 b) is preferably larger than the difference between the minimum value of the dimensional tolerance of the permanent magnet 111b and the maximum value of the dimensional tolerance between the surface 114b and the surface 114c of the magnet housing 104 b. Thus, all of 4 surfaces around the permanent magnet 111b are in contact with the inner wall (each surface) of the magnet housing 104b, and positioning in the magnet housing 104b is facilitated.
Next, the relationship between the rotor core 102 and the magnet housing portions 103a and 103b will be described. As described above, in the direction of the center line 106, the surface 113b forming a part of the magnet housing 103b is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 113a forming the magnet housing 103 a. Concomitantly, in the direction of the center line 106, the permanent magnet 110b housed in the magnet housing 103b is provided so as to protrude further toward the outer periphery side than the permanent magnet 110a housed in the magnet housing 103 a.
In fig. 3, the distance between the center of the surface 113a forming part of the magnet housing 103a and the outer peripheral surface of the rotor core 102 is D1, and the distance between the center of the surface 113b forming part of the magnet housing 103b and the outer peripheral surface of the rotor core 102 is D2.
The distance between the corner of the magnet housing 103a and the point where the tangent T1 of the rotor core 102 passes is P1, and the distance between the corner of the magnet housing 103b and the point where the tangent T2 of the rotor core 102 passes is P2.
In embodiment 1, the distance D1 and the distance D2 are set to be substantially equal distances, and the distance P1 and the distance P2 are set to be substantially equal distances (d1.about.d2, p1.about.p2). Along with this relationship, the permanent magnets 110a and 110b stored in the magnet storage sections 103a and 103b are also set in the same relationship. In embodiment 1, the positional relationship between the permanent magnets 110a and 110b is the same as that of the magnets 103a and 103b in the magnet housing section.
In embodiment 1, the surface 113b forming part of the magnet housing 103b is provided to protrude further toward the outer periphery of the rotor core 102 than the surface 113a forming the magnet housing 103a in the direction of the center line 106, so that the distance D1 and the distance D2 can be set to be substantially equal to each other, and the distance P1 and the distance P2 can be set to be substantially equal to each other.
The relationship between the magnet housing portions 104a and 104b and the permanent magnets 111a and 111b housed therein is the same as that described above, although the description thereof is omitted.
Next, the operation will be described. In the case of a motor in which the rotor includes permanent magnets as in embodiment 1, magnetic flux concentrates at the corners of the permanent magnets, which is one of the main causes of demagnetization. Thus, in embodiment 1, the permanent magnets 110 and 111 housed in the magnet housing portions 103 and 104 are divided into a plurality of (two) permanent magnets 110 and 111 so that steps are generated between the permanent magnets 110a and 110b and between the permanent magnets 111a and 111 b. A corner is formed between permanent magnet 110b and permanent magnet 111b by the step, and the magnetic flux is concentrated at the corner. In embodiment 1, the permanent magnets 110 and 111 are divided into a plurality of (two) pieces, and the corners are increased, so that the concentrated magnetic flux can be dispersed, and demagnetization of the permanent magnets can be suppressed.
In embodiment 1, the permanent magnets 110b and 111b housed in the magnet housing portions 103b and 104b are provided so as to protrude further toward the outer periphery than the permanent magnets 110a and 110b housed in the magnet housing portions 103a and 104a in the direction of the center line 106 passing through the rotation center of the shaft 101 (rotor 100). This makes it possible to bring the permanent magnets 110b, 111b closer to the outer periphery of the rotor core 102, and to suppress demagnetization of the permanent magnets. In addition, in embodiment 1, the distance D1 between the center portion of the surface 113a (114 a) forming part of the magnet housing portion 103a (104 a) and the outer peripheral surface of the rotor core 102 and the distance D2 between the center portion of the surface 113b (114 b) forming part of the magnet housing portion 103b (104 b) and the outer peripheral surface of the rotor core 102 are set to be substantially equal. Thus, the distance between the permanent magnet 110a (111 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 110b (111 b) and the outer peripheral surface of the rotor core 102.
The distance P1 between the corner of the magnet housing 103a (104 a) and the point where the tangent T1 of the rotor core 102 passes and the distance P2 between the corner of the magnet housing 103b (104 b) and the point where the tangent T2 of the rotor core 102 passes are set to be substantially equal to each other. Thus, the distance between the permanent magnet 110a (111 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 110b (111 b) and the outer peripheral surface of the rotor core 102.
According to embodiment 1, since the permanent magnets 110b and 111b located on the bridge 105 side are provided to protrude further toward the outer peripheral side than the permanent magnets 110a and 110b in the direction of the center line 106 passing through the rotation center of the shaft 101 (rotor 100), the permanent magnets 110b and 111b can be brought closer to the outer peripheral side of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
In addition, according to embodiment 1, since the plurality of permanent magnets 110a, 110b and the permanent magnets 111a, 111b disposed in the rotor core 102 are disposed at substantially equal distances from the outer peripheral surface of the rotor core 102, demagnetization of the permanent magnets can be suppressed. Further, the rate of decrease in the residual magnetic flux density when the permanent magnet is viewed as a whole can be suppressed.
In embodiment 1, the distance D1 and the distance D2 are set to be substantially equal to each other, and the distance P1 and the distance P2 are set to be substantially equal to each other, but the distance D1 and the distance D2, or one of the distance P1 and the distance P2 may be set to be equal to each other.
Example 2
Next, embodiment 2 of the present invention will be described with reference to fig. 4 and 5. Fig. 4 is a partial enlarged view of a magnet housing portion according to embodiment 2 of the present invention, showing a configuration of 1 pole in a rotor of a rotary electric machine. Fig. 5 is a partial enlarged view of one of the magnet housing parts in fig. 4.
The surfaces 213a and 213b of the magnet housing 203 on the outer peripheral side of the rotor core 102 are offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 213a is on an extension of the orthogonal line 207a that is orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and the surface 213b is on an extension of the orthogonal line 207b that is orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 207b is arranged so as to be offset from the orthogonal line 207a on the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 213b protrudes from the surface 213a on the outer peripheral side of the rotor core 102 in the direction of the center line 206.
In the magnet housing 203, the surfaces 213c and 213d on the inner peripheral side of the rotor core 102 are offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 213c is on an extension of the orthogonal line 207c orthogonal to the center line 106 passing through the rotation center of the shaft 101 (rotor 100), and the surface 213d is on an extension of the orthogonal line 207d orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 207c is arranged so as to be offset from the orthogonal line 207d on the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 213c protrudes from the surface 213d on the inner peripheral side of the rotor core 102 in the direction of the center line 206. In embodiment 2, the distance between the orthogonal line 207c and the orthogonal line 207d is longer than the distance between the orthogonal line 207a and the orthogonal line 207 b.
In the magnet housing 204, the surfaces 214a and 214b on the outer peripheral side of the rotor core 102 are offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 214a is on an orthogonal line 207a that is orthogonal to a center line 206 passing through the rotation center of the shaft 101 (rotor 100), and the surface 214b is on an extension of the orthogonal line 207b that is orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 207b is arranged so as to be offset from the orthogonal line 207a on the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 214b protrudes from the surface 214a on the outer peripheral side of the rotor core 102 in the direction of the center line 206.
Further, the surfaces 214c and 214d of the magnet housing 204 on the inner peripheral side of the rotor core 102 are offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 214c is on an extension of the orthogonal line 207c orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and the surface 214d is on an extension of the orthogonal line 207d orthogonal to the center line 206 passing through the rotation center of the shaft 101 (rotor 100). That is, the orthogonal line 207c is arranged so as to be offset from the orthogonal line 207d on the center line 206 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 214c protrudes from the surface 214d toward the inner periphery of the rotor core 102 in the direction of the center line 206.
The surface 213a forms a part of the magnet housing 203a, and the surface 213b forms a part of the magnet housing 203 b. Similarly, the surface 214a forms a portion of the magnet housing 204a, and the surface 214b forms a portion of the magnet housing 204 b.
Further, the distances between 207a and 207c, which are the dimensions in the direction of the center line 206 of the magnet housing portion 203a and the magnet housing portion 204a, are set longer than the distances between 207b and 207d, which are the dimensions in the direction of the center line 206 of the magnet housing portion 203b and the magnet housing portion 204 b. As a result, the dimension (thickness) in the direction of the center line 206 of the permanent magnets 210a, 211a disposed in the magnet housing portion 203a, 204a is longer (thicker) than the dimension (thickness) in the direction of the center line 206 of the permanent magnets 210b, 211b disposed in the magnet housing portion 203b, 204b, respectively.
Here, the distance between the surface 213a and the surface 213b (the orthogonal lines 207a and 207 b) is preferably larger than the difference between the minimum value of the dimensional tolerance of the permanent magnet 210b and the maximum value of the dimensional tolerance between the surface 213b and the surface 213d of the magnet housing 203 b. Thus, all of the 4 surfaces around the permanent magnet 210b are in contact with the inner wall (each surface) of the magnet housing 203b, and positioning in the magnet housing 203b is facilitated.
The distance between the surface 213c and the surface 213d (the orthogonal line 207c and the orthogonal line 207 d) is preferably larger than the difference between the minimum value of the dimensional tolerance of the permanent magnet 210a and the maximum value of the dimensional tolerance between the surface 213a and the surface 213c of the magnet housing 203 a. Thus, all of the 4 surfaces around the permanent magnet 210a are in contact with the inner wall (each surface) of the magnet housing 203a, and positioning in the magnet housing 203a is facilitated. Although not described, the relationship between the magnet housing 204 and the permanent magnet 211 is the same.
When the magnet housing portions 203a and 203b are formed, the surfaces 213e and 213f may be arranged offset from each other as shown in fig. 5. The surface 213f forming a part of the magnet housing 203a is a surface formed along the direction of the center line 206, and abuts against the permanent magnet 210a to restrict the movement of the permanent magnet 210 a. The surface 213e constituting a part of the magnet housing 203b is a surface formed along the direction of the center line 206, and abuts against the permanent magnet 210b to restrict the movement of the permanent magnet 210 b. In a direction perpendicular to the center line 206, the surface 213e and the surface 213f are offset to form a predetermined gap C. Although not described, the magnet housing 204 is also configured in the same manner. Regarding the gap C, a gap is also formed between the permanent magnet 210a and the permanent magnet 210 b. Since the permanent magnet 210a and the permanent magnet 210b are arranged with a gap in the magnet housing 203, the magnetic flux passes through the gap, and demagnetization of the permanent magnet 210a and the permanent magnet 210b can be suppressed.
Next, the relationship between the rotor core 102 and the magnet housing portions 203a and 203b will be described. As described above, in the direction of the center line 206, the surface 213b forming a part of the magnet housing portion 203b is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 213a forming the magnet housing portion 203 a. Concomitantly, in the direction of the center line 206, the permanent magnet 210b housed in the magnet housing portion 203b is provided so as to protrude further toward the outer peripheral side than the permanent magnet 210a housed in the magnet housing portion 203 a.
The distance between the center of the surface 213a forming part of the magnet housing 203a and the outer peripheral surface of the rotor core 102 is D1, and the distance between the center of the surface 213b forming part of the magnet housing 203b and the outer peripheral surface of the rotor core 102 is D2.
The distance between the corner of the magnet housing 203a and the point where the tangent to the rotor core 102 passes is P1, and the distance between the corner of the magnet housing 203b and the point where the tangent to the rotor core 102 passes is P2.
In embodiment 2, the distance D1 and the distance D2 are set to be substantially equal distances, and the distance P1 and the distance P2 are set to be substantially equal distances (d1.about.d2, p1.about.p2). Along with this relationship, the permanent magnets 210a and 210b stored in the magnet storage units 203a and 203b are also set to the same relationship.
In embodiment 2, the positional relationship between the magnet housing portions 203a and 203b is described, but the positional relationship between the permanent magnets 210a and 210b is the same.
In embodiment 2, the surface 213b forming part of the magnet housing 203b is provided to protrude further toward the outer periphery of the rotor core 102 than the surface 213a forming the magnet housing 203a in the direction of the center line 206, so that the distance D1 and the distance D2 can be set to be substantially equal to each other, and the distance P1 and the distance P2 can be set to be substantially equal to each other.
The relationship between the magnet housing portions 204a and 204b and the permanent magnets 211a and 211b housed therein is the same as that described above, although the description thereof is omitted.
Next, the operation will be described. In the case of a motor having a permanent magnet as in embodiment 2, magnetic flux is concentrated at the corners of the permanent magnet, which is one of the main causes of demagnetization. Therefore, in embodiment 2, the permanent magnets 210 and 211 housed in the magnet housing portions 203 and 204 are divided into a plurality of pieces, and the permanent magnets 210 and 211 are arranged so that steps are generated between the permanent magnets 210a and 210b and between the permanent magnets 211a and 211 b. A corner is formed between permanent magnet 210b and permanent magnet 211b by a step, and the magnetic flux is concentrated at the corner. In embodiment 2, the permanent magnets 210 and 211 are divided into two (plural) and the corners are increased, so that the concentrated magnetic flux can be dispersed, and demagnetization of the permanent magnets can be suppressed.
In embodiment 2, the permanent magnets 210b and 211b housed in the magnet housing portions 203b and 204b are provided so as to protrude further toward the outer periphery than the permanent magnets 210a and 210b housed in the magnet housing portions 203a and 204a in the direction of the center line 206 passing through the rotation center of the shaft 101 (rotor 100). As a result, the permanent magnets 210b and 211b can be brought closer to the outer periphery of the rotor core 102, and demagnetization of the permanent magnets can be suppressed. In addition, in embodiment 2, the distance D1 between the center portion of the surface 213a (214 a) forming part of the magnet housing portion 203a (204 a) and the outer peripheral surface of the rotor core 102 and the distance D2 between the center portion of the surface 213b (214 b) forming part of the magnet housing portion 203b (204 b) and the outer peripheral surface of the rotor core 102 are set to be substantially equal. Thus, the distance between the permanent magnet 210a (211 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 210b (211 b) and the outer peripheral surface of the rotor core 102.
The distance P1 between the corner of the magnet housing portion 203a (204 a) and the point where the tangent to the rotor core 102 passes and the distance P2 between the corner of the magnet housing portion 203b (204 b) and the point where the tangent to the rotor core 102 passes are substantially equal. Thus, the distance between the permanent magnet 210a (211 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 210b (211 b) and the outer peripheral surface of the rotor core 102.
According to embodiment 2, since the permanent magnets 210b and 211b located on the bridge 205 side are provided to protrude further toward the outer peripheral side than the permanent magnets 210a and 210b in the direction of the center line 206 passing through the rotation center of the shaft 101 (rotor 100), the permanent magnets 210b and 211b can be brought closer to the outer peripheral side of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
In addition, according to embodiment 2, since the plurality of permanent magnets 210a, 210b and the permanent magnets 211a, 211b disposed on the rotor core 102 are disposed at substantially equal distances from the outer peripheral surface of the rotor core 102, demagnetization of the permanent magnets can be suppressed. Further, the rate of decrease in the residual magnetic flux density when the permanent magnet is viewed as a whole can be suppressed.
In embodiment 2, the thicknesses of the permanent magnets 210b and 211b located on the protruding bridge 205 side are made smaller than the thicknesses of the permanent magnets 210a and 211a in the direction of the center line 206, so that the permanent magnets that do not contribute to the magnet torque of the motor can be eliminated, and the amount of use of the permanent magnets can be reduced.
Further, in embodiment 2, the thickness of the permanent magnets 210a, 211a is made thicker (increased) than the thickness of the permanent magnets 210b, 211b in the direction of the center line 206, so that even if demagnetization occurs at the corners outside the poles of the permanent magnets 210a, 211a, a desired magnet magnetic flux can be obtained, and deterioration of motor characteristics can be suppressed.
Further, in embodiment 2, since a gap is formed between the permanent magnets 210a and 210b, the magnetic flux passes through the gap, and demagnetization of the permanent magnets 210a and 210b can be suppressed.
In embodiment 2 described above, the distance D1 and the distance D2 are set to be substantially equal, and the distance P1 and the distance P2 are set to be substantially equal, but the distance D1 and the distance D2, or one of the distance P1 and the distance P2 may be set to be equal.
Example 3
Next, embodiment 3 of the present invention will be described with reference to fig. 6. Fig. 6 is a partial enlarged view of a magnet housing portion according to embodiment 3 of the present invention, showing a configuration of 1 pole in a rotor of a rotary electric machine. The difference from embodiment 2 is the sizes of the magnet housing 203a and the magnet housing 204a, and the sizes of the permanent magnets 210a and 211a housed in them. Other configurations are the same as those of embodiment 2, and therefore detailed description thereof will be omitted below.
In fig. 6, the dimensions (sizes) of the magnet housing portions 203a and 203b and the magnet housing portions 204a and 204b in the direction of the center line 206 are the same. The dimensions (sizes) of these permanent magnets in the direction perpendicular to the center line 206 are also the same. Along with this, the permanent magnets 210a and 210b and the permanent magnets 211a and 211b housed in the magnet housing portions 203a and 203b and the magnet housing portions 204a and 204b are also set to have the same size.
In embodiment 3, since the step portions are formed in the direction of the center line 206 between the magnet housing portions 203a and 203b and between the magnet housing portions 204a and 204b, the permanent magnets 210a and 210b and the permanent magnets 211a and 211b are supported by the inner walls of the 4 faces of the magnet housing portions 203a and 203b and the magnet housing portions 204a and 204b, and thus the positioning of the permanent magnets can be easily performed.
In embodiment 3, the permanent magnets 210a, 210b and 211a, 211b stored in the magnet storage units 203a, 203b and the magnet storage units 204a, 204b can be used with the same size, so that the cost of the permanent magnets in the case of mass production can be reduced, and the motor price can be reduced.
Example 4
Next, embodiment 4 of the present invention will be described with reference to fig. 7. Fig. 7 is a partial enlarged view of a magnet housing portion according to embodiment 4 of the present invention, showing a configuration of 1 pole in a rotor of a rotary electric machine. The difference from embodiment 3 is the number of permanent magnets. In embodiment 3, two permanent magnets 210 and 211 are used in the magnet housing portions 203 and 204, respectively, but in embodiment 4, 3 permanent magnets are used.
The surfaces 313a, 313b, 313c of the magnet housing 303 on the outer peripheral side of the rotor core 102 are offset from each other in a direction passing through the center line 306 of the rotation center of the shaft 101 (rotor 100), and are formed with steps. The surface 313a is on an extension of the orthogonal line 307a orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the surface 313b is on an extension of the orthogonal line 307b orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100), and the surface 313c is on the orthogonal line 307c orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100). That is, on the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the orthogonal line 307b is arranged so as to be offset so that the orthogonal line 307b is located on the outer peripheral side of the rotor core 102 than the orthogonal line 307a, and the orthogonal line 307c is arranged so as to be offset so that the orthogonal line 307c is located on the outer peripheral side of the rotor core 102 than the orthogonal line 307 b. As a result, in the direction of the center line 306, the surface 313b is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 313a, and the surface 313c is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 313 b.
In the magnet housing 303, the surfaces 313d, 313e, 313f on the inner peripheral side of the rotor core 102 are offset in a direction passing through the center line 306 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 313d is on an extension of the orthogonal line 307d orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the surface 313e is on an extension of the orthogonal line 307e orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100), and the surface 313f is on an extension of the orthogonal line 307f orthogonal to the center line 306 passing through the rotation center of the shaft 101 (rotor 100). That is, on the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the orthogonal line 307e is arranged so as to be offset so as to be located on the inner peripheral side of the rotor core 102 than the orthogonal line 307f, and the orthogonal line 307d is arranged so as to be offset so as to be located on the inner peripheral side of the rotor core 102 than the orthogonal line 307 e. As a result, in the direction of the center line 306, the surface 313e is provided to protrude further toward the inner peripheral side of the rotor core 102 than the surface 313f, and the surface 313d is provided to protrude further toward the inner peripheral side of the rotor core 102 than the surface 313 e.
In the magnet housing 304, the surfaces 314a, 314b, and 314c on the outer peripheral side of the rotor core 102 are offset in the direction passing through the center line 306 of the rotation center of the shaft 101 (rotor 100), and a step is formed. Surface 314a is on an extension of orthogonal line 307a that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100), surface 314b is on an extension of orthogonal line 307b that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100), and surface 314c is on orthogonal line 307c that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100). That is, on the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the orthogonal line 307b is arranged so as to be offset so as to be located on the outer peripheral side of the rotor core 102 than the orthogonal line 207a, and the orthogonal line 307c is arranged so as to be offset so as to be located on the outer peripheral side of the rotor core 102 than the orthogonal line 307 b. As a result, in the direction of the center line 306, the surface 314b is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 314a, and the surface 314c is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 314 b.
Further, the surfaces 314d, 314e, 314f of the magnet housing 304 on the inner peripheral side of the rotor core 102 are offset in the direction passing through the center line 306 of the rotation center of the shaft 101 (rotor 100), and a step is formed. Surface 314d is on an extension of orthogonal line 307d that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100), surface 314e is on an extension of orthogonal line 307e that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100), and surface 314f is on an extension of orthogonal line 307f that is orthogonal to centerline 306 through the center of rotation of shaft 101 (rotor 100). That is, on the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the orthogonal line 307d is arranged so as to be offset so as to be located on the inner peripheral side of the rotor core 102 than the orthogonal line 307e, and the orthogonal line 307e is arranged so as to be offset so as to be located on the inner peripheral side of the rotor core 102 than the orthogonal line 307 f. As a result, in the direction of the center line 306, the surface 314d is provided to protrude further toward the inner peripheral side of the rotor core 102 than the surface 314e, and the surface 314e is provided to protrude further toward the inner peripheral side of the rotor core 102 than the surface 314 f.
The surface 313a forms a part of the magnet housing 303a, the surface 313b forms a part of the magnet housing 303b, and the surface 313c forms a part of the magnet housing 303 c. Similarly, surface 314a forms a portion of magnet receptacle 304a, surface 314b forms a portion of magnet receptacle 304b, and surface 314c forms a portion of magnet receptacle 304 c.
Next, the relationship between the rotor core 102 and the magnet housing portions 303a, 303b, and 303c will be described. As described above, in the direction of the center line 306, the surface 313b forming a part of the magnet housing 303b is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 313a forming the magnet housing 303a, and the surface 313c forming a part of the magnet housing 303c is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 313b forming the magnet housing 303 b. Concomitantly, in the direction of the center line 306, the permanent magnet 310b housed in the magnet housing portion 303b is provided so as to protrude further toward the outer peripheral side than the permanent magnet 310a housed in the magnet housing portion 303a, and the permanent magnet 310c housed in the magnet housing portion 303c is provided so as to protrude further toward the outer peripheral side than the permanent magnet 310b housed in the magnet housing portion 303 b. Accordingly, the permanent magnets 310b, 310c, 311b, 311c can be brought closer to the outer peripheral side of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
The distance between the center of the surface 313a forming part of the magnet housing 303a and the outer peripheral surface of the rotor core 102 is D1, the distance between the center of the surface 313b forming part of the magnet housing 303b and the outer peripheral surface of the rotor core 102 is D2, and the distance between the center of the surface 313c forming part of the magnet housing 303c and the outer peripheral surface of the rotor core 102 is D3.
The distance between the corner of the magnet housing 303a and the point at which the tangent to the rotor core 102 passes is P1, the distance between the corner of the magnet housing 303b and the point at which the tangent to the rotor core 102 passes is P2, and the distance between the corner of the magnet housing 303c and the point at which the tangent to the rotor core 102 passes is P3.
In embodiment 4, the distances D1, D2, and D3 are set to be substantially equal distances, and the distances P1, P2, and P3 are set to be substantially equal distances (d1.about.d2.about.d3, p1.about.p2.about.p3). Along with this relationship, the permanent magnets 310a, 310b, 310c stored in the magnet storage sections 303a, 303b, 303c are set to the same relationship.
In embodiment 4, the positional relationship among the magnets 303a, 303b, and 303c in the magnet housing portion is described, but the positional relationship among the permanent magnets 310a, 310b, and 310c is also the same.
In embodiment 4, in the direction of the center line 306, the surface 313b forming part of the magnet housing portion 303b is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 313a forming the magnet housing portion 303a, and the surface 313c forming part of the magnet housing portion 303c is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 313b forming the magnet housing portion 303b, so that the distances D1, D2, and D3 can be set to substantially equal distances, and the distances P1, P2, and P3 can be set to substantially equal distances.
The relationship between the magnet housing portions 304a, 304b, 304c and the permanent magnets 311a, 311b, 311c housed therein is the same as described above, although the description thereof is omitted.
Next, the operation will be described. In the case of a motor having a permanent magnet as in embodiment 4, magnetic flux is concentrated at the corners of the permanent magnet, which is one of the main causes of demagnetization. Therefore, in embodiment 4, the permanent magnets 210 and 211 housed in the magnet housing portions 203 and 204 are divided into 3 (a plurality of) pieces, and the permanent magnets 310 and 311 are arranged so that steps are generated between the permanent magnets 310a and 310b, between the permanent magnets 310b and 310c, between the permanent magnets 311a and 311b, and between the permanent magnets 311b and 311 c. The permanent magnets 310b, 310c and the permanent magnets 311b, 311c form corners by steps, and the magnetic flux is concentrated at the corners. In embodiment 4, the permanent magnets 210 and 211 are divided into 3 (a plurality of) pieces, and the corners are increased, so that the concentrated magnetic flux can be dispersed, and demagnetization of the permanent magnets can be suppressed.
In embodiment 4, the permanent magnets 310b and 311b housed in the magnet housing portions 303b and 304b are provided so as to protrude further toward the outer periphery than the permanent magnets 310a and 311a housed in the magnet housing portions 303a and 304a in the direction of the center line 306 passing through the rotation center of the shaft 101 (rotor 100). Further, in the direction of the center line 306 passing through the rotation center of the shaft 101 (rotor 100), the permanent magnets 310c, 311c housed in the magnet housing portions 303c, 304c are provided to protrude further toward the outer peripheral side than the permanent magnets 310b, 311b housed in the magnet housing portions 303b, 304 b.
According to embodiment 4, since the permanent magnets 310c and 311c located on the bridge 105 side are provided to protrude further toward the outer peripheral side than the permanent magnets 310a and 311a in the direction of the center line 106 passing through the rotation center of the shaft 101 (rotor 100), the permanent magnets 310c and 311c can be brought closer to the outer peripheral side of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
In embodiment 4, the distance D1 between the center of the surface 313a (314 a) forming part of the magnet housing portion 303a (304 a) and the outer peripheral surface of the rotor core 102, the distance D2 between the center of the surface 313b (314 b) forming part of the magnet housing portion 303b (304 b) and the outer peripheral surface of the rotor core 102, and the distance D3 between the center of the surface 313c (314 c) forming part of the magnet housing portion 303c (304 c) and the outer peripheral surface of the rotor core 102 are set to be substantially equal. Thus, the distance between permanent magnet 310a (311 a) and the outer peripheral surface of rotor core 102, the distance between permanent magnet 310b (311 b) and the outer peripheral surface of rotor core 102, and the distance between permanent magnet 310c (311 c) and the outer peripheral surface of rotor core 102 are also substantially equal.
The distance P1 between the corner of the magnet housing portion 303a (304 a) and the point where the tangent to the rotor core 102 passes, the distance P2 between the corner of the magnet housing portion 303b (304 b) and the point where the tangent to the rotor core 102 passes, and the distance P3 between the corner of the magnet housing portion 303c (304 c) and the point where the tangent to the rotor core 102 passes are substantially equal. Thus, the distance between permanent magnet 310a (311 a) and the outer peripheral surface of rotor core 102, the distance between permanent magnet 310b (311 b) and the outer peripheral surface of rotor core 102, and the distance between permanent magnet 310c (311 c) and the outer peripheral surface of rotor core 102 are also substantially equal.
According to embodiment 4, since the plurality of permanent magnets 310a, 310b, 310c and the permanent magnets 211a, 211b, 211c arranged on the rotor core 102 are arranged at substantially equal distances from the outer peripheral surface of the rotor core 102, demagnetization of the permanent magnets can be suppressed. Further, the rate of decrease in the residual magnetic flux density when the permanent magnet is viewed as a whole can be suppressed.
In embodiment 4, the permanent magnets 310a, 310b, 310c and 311a, 311b, 311c stored in the magnet storage sections 303a, 303b, 303c and the magnet storage sections 304a, 304b, 304c can be used with the same size, so that the cost of the permanent magnets in the case of mass production can be reduced, and the motor price can be reduced.
In embodiment 4 described above, the distances D1, D2, and D3 are set to be substantially equal distances, and the distances P1, P2, and P3 are set to be substantially equal distances, but any one of the distances D1, D2, and D3, or the distances P1, P2, and P3 may be set to be equal.
In embodiment 4, the number of permanent magnets stored in the magnet storage unit is 3, but may be 4 or more, and the number of permanent magnets is not limited.
Example 5
Next, embodiment 5 of the present invention will be described with reference to fig. 8. Fig. 8 is a partial enlarged view of a magnet housing portion according to embodiment 5 of the present invention, showing a configuration of 1 pole in a rotor of a rotary electric machine. In embodiments 1 to 4, the surface forming the magnet housing portion is formed so as to be perpendicular to the center line passing through the rotation center of the shaft 101 (rotor 100), but in embodiment 5, is provided obliquely with respect to an orthogonal line orthogonal to the center line passing through the rotation center of the shaft 101 (rotor 100).
The surfaces 414a and 414b of the magnet housing 404 on the outer peripheral side of the rotor core 102 are offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed. The surface 414a is located on a straight line 407a, and the straight line 407a is disposed so as to be inclined at an acute angle α on the outer peripheral side of the rotor core 102 at an angle intersecting with a center line 406 passing through the rotation center of the shaft 101 (rotor 100).
The surface 414b is located on a straight line 407b, and the straight line 407b is disposed so as to be inclined at an acute angle α on the outer peripheral side of the rotor core 102 at an angle intersecting with a center line 406 passing through the rotation center of the shaft 101 (rotor 100). That is, the straight line 407b is disposed so as to be offset from the straight line 407a in the direction of the center line 406 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 414b is provided so as to protrude from the surface 414a toward the outer periphery of the rotor core 102 in the direction of the center line 206.
In the magnet housing 403, a surface 414c and a surface 414d on the inner peripheral side of the rotor core 102 are arranged offset in a direction passing through the center line 206 of the rotation center of the shaft 101 (rotor 100), and a step is formed.
The surface 414c is located on a straight line 407c, and the straight line 407c is disposed obliquely so that an angle intersecting with a center line 406 passing through the rotation center of the shaft 101 (rotor 100) becomes an acute angle α on the outer peripheral side of the rotor core 102. The surface 414d is located on a straight line 407d, and the straight line 407d is disposed so as to be inclined at an acute angle α on the outer peripheral side of the rotor core 102 at an angle intersecting the center line 406 passing through the rotation center of the shaft 101 (rotor 100). That is, the straight line 407c is disposed so as to be offset from the straight line 407d in the direction of the center line 406 passing through the rotation center of the shaft 101 (rotor 100), and as a result, the surface 414c is provided so as to protrude from the surface 414d toward the inner periphery of the rotor core 102 in the direction of the center line 406.
The magnet housing portions 403 and 404 are formed to be line-symmetrical with respect to the center line 406, and the magnet housing portions 403 and 404 are arranged in a V-shape. The permanent magnets 410 and 411 are also arranged in a V-shape.
The magnet housing 403 is also configured similarly to the magnet housing 404. That is, in the direction of the center line 206, the surface 413b is provided to protrude further toward the outer peripheral side of the rotor core 102 than the surface 413 a. In addition, in the direction of the center line 406, the surface 413c is provided to protrude further toward the inner peripheral side of the rotor core 102 than the surface 413 d.
The surface 413a forms a part of the magnet housing portion 403a, and the surface 413b forms a part of the magnet housing portion 403 b. Similarly, surface 414a forms a portion of magnet housing 404a and surface 414b forms a portion of magnet housing 204 b.
Next, the relationship between the rotor core 102 and the magnet housing portions 403a and 403b will be described. As described above, in the direction of the center line 406, the surface 413b forming a part of the magnet housing portion 403b is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 413a forming the magnet housing portion 403 a. Concomitantly, in the direction of the center line 406, the permanent magnet 410b housed in the magnet housing portion 403b is provided so as to protrude further toward the outer peripheral side than the permanent magnet 410a housed in the magnet housing portion 403 a. As a result, the permanent magnets 410b and 411b can be brought closer to the outer periphery of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
The distance between the center of the surface 413a forming part of the magnet housing 403a and the outer peripheral surface of the rotor core 102 is D1, and the distance between the center of the surface 413b forming part of the magnet housing 403b and the outer peripheral surface of the rotor core 102 is D2.
The distance between the corner of the magnet housing portion 403a and the point at which the tangent to the rotor core 102 passes is P1, and the distance between the corner of the magnet housing portion 203b and the point at which the tangent to the rotor core 102 passes is P2.
In embodiment 5, the distance D1 and the distance D2 are set to be substantially equal distances, and the distance P1 and the distance P2 are set to be substantially equal distances (d1·d2, p1·p2). In accordance with this relationship, the permanent magnets 410a and 410b stored in the magnet storage sections 403a and 403b are also set to have the same relationship.
In embodiment 5, the positional relationship between the permanent magnets 410a and 410b is the same as that of the magnets 403a and 403b in the magnet housing section.
In embodiment 5, the surface 413b forming part of the magnet housing portion 403b is provided to protrude further toward the outer periphery side of the rotor core 102 than the surface 413a forming the magnet housing portion 403a in the direction of the center line 406, so that the distance D1 and the distance D2 can be set to be substantially equal to each other, and the distance P1 and the distance P2 can be set to be substantially equal to each other.
The relationship between the magnet housing portions 404a and 404b and the permanent magnets 411a and 411b housed therein is the same as that described above, although the description thereof is omitted.
Next, the operation will be described. In the case of a motor having a rotor provided with permanent magnets as in embodiment 5, magnetic flux is concentrated at corners of the permanent magnets, which is one of the main causes of demagnetization. Thus, in embodiment 5, the permanent magnets 410 and 411 accommodated in the magnet accommodating portions 403 and 404 are divided into two (a plurality of) permanent magnets 410 and 411, respectively, and the permanent magnets 410 and 411 are arranged so that steps are generated between the permanent magnets 410a and 410b and between the permanent magnets 411a and 411 b. A corner is formed between the permanent magnet 410b and the permanent magnet 411b by the step, and the magnetic flux is concentrated at the corner. In embodiment 5, the permanent magnets 410 and 411 are divided into two (a plurality of) and the corners are increased, so that the concentrated magnetic flux can be dispersed, and demagnetization of the permanent magnets can be suppressed.
In embodiment 5, the permanent magnets 410b and 411b housed in the magnet housing portions 403b and 404b are provided so as to protrude further toward the outer periphery than the permanent magnets 410a and 410b housed in the magnet housing portions 403a and 404a in the direction of the center line 406 passing through the rotation center of the shaft 101 (rotor 100). According to embodiment 5, since the permanent magnets 410b and 411b located on the bridge 405 side are provided to protrude further toward the outer peripheral side than the permanent magnets 410a and 410b in the direction of the center line 406 passing through the rotation center of the shaft 101 (rotor 100), the permanent magnets 410b and 411b can be brought closer to the outer peripheral side of the rotor core 102, and demagnetization of the permanent magnets can be suppressed.
The distance D1 between the center of the surface 413a (414 a) forming part of the magnet housing portion 403a (404 a) and the outer peripheral surface of the rotor core 102 and the distance D2 between the center of the surface 413b (414 b) forming part of the magnet housing portion 403b (404 b) and the outer peripheral surface of the rotor core 102 are set to be substantially equal. Thus, the distance between the permanent magnet 410a (411 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 410b (411 b) and the outer peripheral surface of the rotor core 102.
Further, a distance P1 between the corner of the magnet housing portion 403a (404 a) and a point where the tangent of the rotor core 102 passes and a distance P2 between the corner of the magnet housing portion 403b (404 b) and a point where the tangent of the rotor core 102 passes are substantially equal to each other. Thus, the distance between the permanent magnet 410a (411 a) and the outer peripheral surface of the rotor core 102 is substantially equal to the distance between the permanent magnet 410b (411 b) and the outer peripheral surface of the rotor core 102.
According to embodiment 5, since the plurality of permanent magnets 410a, 410b and the permanent magnets 411a, 411b disposed on the rotor core 102 are disposed at substantially equal distances from the outer peripheral surface of the rotor core 102, demagnetization of the permanent magnets can be suppressed. Further, the rate of decrease in the residual magnetic flux density when the permanent magnet is viewed as a whole can be suppressed.
Further, in embodiment 5, the permanent magnets 410 and 411 are arranged in a V-shape, so that reluctance torque can be used, and motor torque can be increased in addition to the anti-demagnetizing force.
In embodiment 5 described above, the distance D1 and the distance D2 are set to be substantially equal to each other, and the distance P1 and the distance P2 are set to be substantially equal to each other, but the distance D1 and the distance D2, or one of the distance P1 and the distance P2 may be set to be equal to each other.
Symbol description
10. Rotating Electrical machine
100. Rotor
101. Shaft
102.rotor core
103. 103a, 103b, 104a, 104b·magnet housing part
105 bridge
106 center line
107a, 107b·orthogonal line
110. 110a, 110b, 111a, 111b·permanent magnet
203. 203a, 203b, 204a, 204b·magnet housing portion
205 bridge
206 center line
207a, 207b, 207c 207d·orthogonal line
210. 210a, 210b, 211a, 211b, 211c·permanent magnet
303. 303a, 303b, 303c, 304a, 304b, 304c·magnet housing portion
305 bridge
306.center line
307a, 307b, 307c, 307d, 307e, 307f··orthogonal lines
310. 310a, 310b, 310c, 311a, 311b, 311c permanent magnet
403. 403a, 403b, 404a, 404b·magnet housing portion
405 bridge
406 center line
407a, 407b, 407c, 407 d. Straight line
410. 410a, 410b, 411a, 411b·permanent magnet
500. Stator
501 stator core
502. Tank
503.coil.
Claims (11)
1. A rotor in which a plurality of permanent magnets are housed in 1 magnet housing sections provided in a rotor core, characterized in that,
the plurality of permanent magnets are arranged in a quadrangular shape so as to form a step on a surface on the outer peripheral side of the rotor core, and are arranged so that a distance between a surface of the quadrangular shape facing the outer peripheral side of the rotor core and the outer peripheral surface of the rotor core is equal and a distance between a corner of the quadrangular shape and the outer peripheral surface of the rotor core is equal.
2. The rotor of claim 1, wherein the rotor comprises a plurality of rotor blades,
the magnet housing portions are provided with a pair so as to be adjacent to each other with a bridge therebetween.
3. A rotor according to claim 2, wherein,
the thickness of a permanent magnet located on the bridge side among the plurality of permanent magnets accommodated in the magnet accommodating portion is reduced.
4. A rotor according to claim 1 or 2, characterized in that,
the plurality of permanent magnets stored in the magnet storage unit are made to have the same size.
5. A rotor according to claim 2, wherein,
the plurality of permanent magnets are obliquely arranged: an angle intersecting a center line passing through the bridge and a rotation center of the rotor becomes an acute angle on an outer peripheral side of the rotor core.
6. A rotor having a rotor core provided with a pair of magnet housing portions adjacent to each other with a bridge interposed therebetween, wherein a plurality of permanent magnets are housed in each of the pair of magnet housing portions,
the surface of the plurality of permanent magnets on the outer peripheral side of the rotor core is arranged on an extension line of an orthogonal line orthogonal to a center line passing through the rotation centers of the bridge and the rotor,
the plurality of permanent magnets are arranged in a quadrangular shape so as to be offset so that a surface on the outer circumferential side of the rotor core is stepped in the direction of the center line, and the plurality of permanent magnets are each arranged in the rotor core so that the distance between the surface on the outer circumferential side of the rotor core and the outer circumference of the rotor core is equal and the distance between the corners of the quadrangular shape and the outer circumference of the rotor core is equal.
7. The rotor as set forth in claim 6, wherein,
the size of a permanent magnet located in the direction of the center line of the bridge side among the plurality of permanent magnets accommodated in the magnet accommodating portion is reduced.
8. The rotor as set forth in claim 6, wherein,
the plurality of permanent magnets stored in the magnet storage unit are made to have the same size.
9. The rotor as set forth in claim 6, wherein,
the plurality of permanent magnets accommodated in the magnet accommodating portion are arranged with a gap maintained therebetween.
10. A rotary electric machine includes a rotor, a shaft fixed to the rotor, and a stator disposed around the rotor,
the rotor is provided with: a rotor core; a pair of magnet housing portions provided to the rotor core and adjacent to each other with a bridge therebetween; a plurality of permanent magnets which are respectively accommodated in the pair of magnet accommodating parts,
the rotating electrical machine is characterized in that,
the surface of the plurality of permanent magnets on the outer peripheral side of the rotor core is arranged on an extension line of an orthogonal line orthogonal to a center line passing through the rotation centers of the bridge and the rotor,
the plurality of permanent magnets are arranged in a quadrangular shape so as to be offset so that a surface on the outer circumferential side of the rotor core is stepped in the direction of the center line, and the plurality of permanent magnets are each arranged in the rotor core so that the distance between the surface on the outer circumferential side of the rotor core and the outer circumference of the rotor core is equal and the distance between the corners of the quadrangular shape and the outer circumference of the rotor core is equal.
11. The rotating electrical machine according to claim 10, wherein,
the plurality of permanent magnets accommodated in the magnet accommodating portion are arranged with a gap maintained therebetween.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-082277 | 2018-04-23 | ||
| JP2018082277A JP7137960B2 (en) | 2018-04-23 | 2018-04-23 | Rotor and rotary electric machine provided with this rotor |
| PCT/JP2019/010463 WO2019208009A1 (en) | 2018-04-23 | 2019-03-14 | Rotor and rotating electric machine with the rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111989843A CN111989843A (en) | 2020-11-24 |
| CN111989843B true CN111989843B (en) | 2023-05-19 |
Family
ID=68293545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980019937.4A Active CN111989843B (en) | 2018-04-23 | 2019-03-14 | Rotor and rotating electrical machine provided with same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7137960B2 (en) |
| CN (1) | CN111989843B (en) |
| WO (1) | WO2019208009A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7229203B2 (en) * | 2020-06-30 | 2023-02-27 | 株式会社日立産機システム | Permanent magnet rotary electric machine and rotor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013212035A (en) * | 2012-03-30 | 2013-10-10 | Daikin Ind Ltd | Motor and compressor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000228838A (en) | 1998-12-01 | 2000-08-15 | Toyota Motor Corp | Permanent magnet motor |
| JP4854867B2 (en) | 2001-05-10 | 2012-01-18 | 三菱電機株式会社 | Electric motor |
| JP2005006484A (en) | 2003-05-21 | 2005-01-06 | Mitsubishi Heavy Ind Ltd | Ipm rotary electric machine |
| US7705503B2 (en) * | 2005-09-07 | 2010-04-27 | Kabushiki Kaisha Toshiba | Rotating electrical machine |
| JP2009038930A (en) | 2007-08-03 | 2009-02-19 | Daikin Ind Ltd | Rotor and embedded magnet type motor |
| JP5732447B2 (en) * | 2012-11-26 | 2015-06-10 | 本田技研工業株式会社 | Rotating electrical machine rotor |
| JP2014171372A (en) | 2013-03-05 | 2014-09-18 | Toyota Industries Corp | Permanent magnet embedded rotor of dynamo-electric machine and dynamo-electric machine |
| CN105914927B (en) * | 2016-07-01 | 2018-09-11 | 哈尔滨工业大学 | Increase the adjustable flux electric machine of V-type built in magnetic-type |
-
2018
- 2018-04-23 JP JP2018082277A patent/JP7137960B2/en active Active
-
2019
- 2019-03-14 CN CN201980019937.4A patent/CN111989843B/en active Active
- 2019-03-14 WO PCT/JP2019/010463 patent/WO2019208009A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013212035A (en) * | 2012-03-30 | 2013-10-10 | Daikin Ind Ltd | Motor and compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111989843A (en) | 2020-11-24 |
| WO2019208009A1 (en) | 2019-10-31 |
| JP7137960B2 (en) | 2022-09-15 |
| JP2019193393A (en) | 2019-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7595575B2 (en) | Motor/generator to reduce cogging torque | |
| JP4961302B2 (en) | Axial gap type motor | |
| US10734853B2 (en) | Rotating electric machine with various ratios for permanent magnets and holes, rotor salient and magnetic poles, rotor laminations, air gaps and stator tooth thickness | |
| US20090001831A1 (en) | Axial Field Electric Motor and Method | |
| US20130285500A1 (en) | Rotor for a motor and a motor | |
| US9106118B2 (en) | Rotor having projections for positioning permanent magnets and electric motor including such rotor | |
| WO2020110191A1 (en) | Rotating electrical machine | |
| JP2008312321A (en) | Rotor and rotary electric machine | |
| US11894726B2 (en) | Rotating electric machine | |
| JPH06245419A (en) | Yoke for motor or generator | |
| CN111989843B (en) | Rotor and rotating electrical machine provided with same | |
| JP6507956B2 (en) | Permanent magnet type rotating electric machine | |
| JP4605480B2 (en) | Axial gap type motor | |
| JP6895909B2 (en) | Hybrid field double gap synchronous machine | |
| JP5041415B2 (en) | Axial gap type motor | |
| CN112152351A (en) | Rotor for motor, motor for vehicle and vehicle | |
| JP5353804B2 (en) | Axial gap type rotating electrical machine and manufacturing method thereof | |
| US11050332B2 (en) | Enhanced permanent magnet claw pole segment geometry | |
| CN112438010A (en) | Electric machine | |
| CN110785913A (en) | Rotating electrical machine | |
| US20230006488A1 (en) | Rotating electrical machine | |
| US10840786B2 (en) | Rotary electric machine having magnetic flux supplied from a field coil | |
| US20230318375A1 (en) | Rotary electric machine | |
| US11843284B2 (en) | Rotor of rotary electric machine and rotary electric machine | |
| WO2021200050A1 (en) | Motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Ibaraki Applicant after: Hitachi astemo Co.,Ltd. Address before: Ibaraki Applicant before: HITACHI AUTOMOTIVE SYSTEMS, Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |