JP2002101585A - Rotor structure of synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a satisfactory output-torque characteristic by utilizing effectively reactance torque by a magnetic member (rotor core) inside of a permanent magnet. SOLUTION: A rotor 11 comprises a first rotor core 14 having an arc side 14a and a first magnet abutment surface 14b alternately on the outer surface, a permanent magnet 12 arranged by abutting one of the pole face thereof against the first magnet abutment surface 14b, an arc side 13a, and a second magnet abutment surface 13b, wherein further provided with a second rotor core 13 arranged by abutting the second magnet abutment surface 13b against the other pole face of the permanent magnet and an annular stiffened member 15 of nonmagnetic material arranged around the periphery of the rotor so as to abut the arc side 14a of the first rotor core and the arc side 13a of the second rotor core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure of a synchronous motor in which a permanent magnet is embedded in a rotor core.

[0002]

2. Description of the Related Art FIG. 9 shows the structure of a conventional rotor described in Japanese Patent Application Laid-Open No. 11-196555. The rotor 111 includes a magnetic member 114 having a polygonal outer peripheral surface fixed to the rotation shaft 116, and a plate-like permanent magnet 112 disposed on the outer peripheral surface corresponding to each side of the polygonal magnetic member 114. And a magnetic laminated member 113 having a circular outer periphery fixed to the outside of these permanent magnets 112, and a reinforcing member 115 made of a non-magnetic material fixed to the outer periphery of the magnetic laminated members 113. A resin material 118 is filled in a gap between the magnetic laminated member 113 and the magnetic laminated member 113, and these are integrated. With such a structure, the rotor 11 can have a large centrifugal force, that is, a strength that can withstand high-speed rotation.

FIG. 10 is Japanese Patent Application Laid-Open No. 2000-15253.
No. 8 discloses a structure of a rotor of a conventional general IPM motor. The rotor 131 has a permanent magnet 133 in a hole of a rotor core 132 made of a magnetic laminated steel sheet.
Is inserted. At the end of the permanent magnet 133, a thin portion 134 of a magnetic steel plate is secured to secure the strength of the rotor.

[0004]

By the way, in the rotor 111 shown in FIG. 9, since the permanent magnet 112 is arranged so as to surround the magnetic member 114, the magnetic member 114 hardly contributes to the reluctance torque.
The advantage of an IPM (magnet embedded) motor that it can obtain both a magnet torque and a reluctance torque is partially hindered.

[0005] On the other hand, the general I shown in FIG.
In the rotor 131 of the PM motor, while a sufficient reluctance torque is obtained, a leakage magnetic flux Φm is generated through the thin portion 134 of the magnetic steel plate remaining at the end of the permanent magnet 133,
There is a problem that effective magnetic flux Φ for generating magnet torque is reduced. In order to suppress the generation of the leakage magnetic flux Φm, the width of the thin portion 134 may be reduced.
When the rotor is rotated at high speed, the thin portion 134 may be broken by centrifugal force acting on the permanent magnet 133 and the magnet outer portion 135 of the magnetic steel plate.

The present invention has been made in consideration of the above circumstances, and a rotor structure of a synchronous motor capable of obtaining good output-torque characteristics by effectively utilizing the reluctance torque of a magnetic member (rotor core) inside a permanent magnet. The purpose is to provide.

[0007]

According to the first aspect of the present invention,
In order to solve the above-mentioned problems, a first rotor core in which an arc surface having a predetermined radius from the center of the rotor and a first magnet contact surface are alternately formed in a circumferential direction on an outer peripheral surface, and a rotation axis is fixed to the center of the rotor; A permanent magnet disposed so that one magnetic pole surface is in contact with the first magnet contact surface, an arc surface having the same radius as the predetermined radius, and a second magnet contact surface; A second contact surface arranged in contact with the other magnetic pole surface of the permanent magnet;
A rotor core; an arc surface of the first rotor core;
An annular reinforcing member made of a non-magnetic material, which is disposed on the outer peripheral portion of the rotor so as to contact the arc surface of the rotor core.

According to a second aspect of the present invention, in order to solve the above-mentioned problem, a first magnet contact surface of the first rotor core and one magnetic pole surface of the permanent magnet are formed in a shape to be engaged in a circumferential direction. The gist is that it has been done.

According to a third aspect of the present invention, in order to solve the above-mentioned problem, the second magnet contact surface of the second rotor core and the other magnetic pole surface of the permanent magnet are formed in a shape that engages in the circumferential direction. The gist is that it has been done.

According to a fourth aspect of the present invention, in order to solve the above-mentioned problem, an arc surface of the second rotor core and a contact surface between the arc surface of the reinforcing member and the reinforcing member are formed in a shape engaging in a circumferential direction. The gist is that it has been done.

According to a fifth aspect of the present invention, in order to solve the above problems, the first rotor core and the second rotor core include:
The gist of the invention is to have a structure in which magnetic steel sheets are stacked in the direction of the rotation axis.

According to a sixth aspect of the present invention, in order to solve the above problem, a hole serving as a guide when laminating the magnetic steel plates is formed in each magnetic steel plate constituting the second rotor core. I do.

According to a seventh aspect of the present invention, in order to solve the above problem, the magnetic steel sheets constituting the second rotor core are bonded and integrated with each other.

[0014]

According to the first aspect of the present invention, the rotor cores located inside and outside the permanent magnet are separated and independent as the first rotor core and the second rotor core, and the rotor cores are provided on the outer peripheral surface of the first rotor core located inside. An arc surface and a first magnet contact surface are alternately formed, and one magnetic pole surface of the permanent magnet is brought into contact with the first magnet contact surface of the first rotor core, and the second rotor core located outside the permanent magnet Since the second magnet contact surface formed in the first embodiment is configured to contact the other magnetic pole surface of the permanent magnet, the reluctance torque by the rotor cores inside and outside the permanent magnet can be effectively used. Also, the first
Since the annular reinforcing member made of a non-magnetic material is arranged on the outer peripheral portion of the rotor so as to contact the arc surface of the rotor core and the arc surface of the second rotor core, the rotor has a large centrifugal force, that is, a strength capable of withstanding high-speed rotation. And the leakage magnetic flux passing outside the permanent magnet can be reduced. Therefore, the output-torque characteristics can be improved.

According to the second aspect of the present invention, since the contact surface between the first rotor core and the permanent magnet is formed in a shape that engages in the circumferential direction, the positioning of the permanent magnet can be easily performed. , Making it easier to manufacture the rotor.

According to the third aspect of the present invention, since the contact surface between the second rotor core and the permanent magnet is formed in a shape that engages in the circumferential direction, the positioning of the permanent magnet can be easily performed. , Making it easier to manufacture the rotor.

According to the fourth aspect of the present invention, since the arcuate surface of the second rotor core and the contact surface of the reinforcing member are formed in such a shape as to engage in the circumferential direction, the second member with respect to the reinforcing member is formed.
The positioning of the rotor core can be easily performed, and the second rotor core can be assembled while being fitted into the reinforcing member, thereby facilitating the manufacture of the rotor.

According to the fifth aspect of the present invention, since the first rotor core and the second rotor core are formed as a laminate of magnetic steel plates, the reluctance torque of the first and second rotor cores can be effectively utilized. it can.

According to the present invention, the holes serving as guides for laminating the magnetic steel plates are formed in each magnetic steel plate constituting the second rotor core, so that the holes are used as guides. Accordingly, the first rotor core can be easily manufactured, and the manufacture of the rotor can be facilitated.

According to the present invention, since the magnetic steel plates constituting the second rotor core are integrated by bonding to each other, the second rotor core can be manufactured easily. The rotor can be easily manufactured.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a diagram showing a configuration of a rotor 11 to which a rotor structure of a synchronous motor according to a first embodiment of the present invention can be applied.

The rotor 11 is provided inside a stator (not shown) provided in an outer peripheral direction, and generates a reaction force on each of the permanent magnets 12 with respect to a rotating magnetic flux given from the stator, thereby rotating the rotating shaft 16. It is configured to rotate around the center. The magnetic poles of the adjacent permanent magnets 12 are set in opposite directions.

In this rotor 11, the permanent magnets 12 are arranged only in two pole pairs, but the number of poles in the present invention is not limited to this.

The rotor 11 includes a permanent magnet 12, a first rotor core 14 on the inner peripheral side of the permanent magnet 12, and a permanent magnet 1.
2 comprises a second rotor core 13 on the outer peripheral side and an annular non-magnetic reinforcing member 15 disposed on the outermost peripheral portion of the rotor 11. I have. First rotor core 14 and second rotor core 1
Numeral 3 is configured as an independent member, and each is configured by laminating a large number of magnetic steel plates in a rotation axis direction (a direction perpendicular to the paper surface).

The first rotor core 14 disposed inside the permanent magnet 12 has, on its outer peripheral surface, arcuate surfaces 14a having a predetermined radius from the center of the rotor and flat first magnet contact surfaces 14b alternately arranged in the circumferential direction. ing. The permanent magnet 12 is formed in a plate shape having both magnetic pole surfaces at both ends in the radial direction of the rotor 11, and both end surfaces in the plate width direction are formed as arc surfaces 12 a having the same radius as the arc surface 14 a of the first rotor core 14. In the state where one magnetic pole surface is in contact with the first magnet contact surface 14b,
It is arranged on the outer peripheral surface of the rotor core 14.

The second rotor core 13 includes the first rotor core 1
4 has an arc surface 13a having the same radius as the arc surface 14a and a flat second magnet contact surface 13b, and the second magnet contact surface 13b is in contact with the other magnetic pole surface of the permanent magnet 12. And is disposed on the outer peripheral side of the permanent magnet 12. And
The annular reinforcing member 15 made of a non-magnetic material is used for the first rotor core 1.
4, the arc surface 14a of the permanent magnet 12,
The second rotor core 13a is arranged on the outer peripheral portion of the rotor so as to abut against the arc surface 13a.

The reinforcing member 15 can be formed by, for example, winding a band of Kepler or carbon, or fitting a non-magnetic stainless steel circular tube.

As described above, the rotor cores located inside and outside the permanent magnet 12 are separated and independent as the first rotor core 14 and the second rotor core 13, and the arc surface 14 a is formed on the outer peripheral surface of the first rotor core 14 located inside. The first rotor core 14 is formed by alternately forming one magnet contact surface 14b.
One magnetic pole surface of the permanent magnet 12 is brought into contact with the magnet contact surface 14b, and the second rotor core 1 located outside the permanent magnet 12
3 is brought into contact with the other magnetic pole surface of the permanent magnet 12, and the outermost annular reinforcing member 15 is connected to the arc surface 14 a of the first rotor core 14 and the second rotor core 1.
Because the rotor cores 14 and 13 are both in contact with the arc surface 13a, the reluctance torque by the rotor cores 14 and 13 inside and outside the permanent magnet 12 can be effectively used.

Further, since there is no magnetic material at the end of each permanent magnet 12, leakage magnetic flux passing outside the permanent magnet 12 can be reduced. Therefore, in this rotor 11,
Output-torque characteristics can be improved, and the amount of magnets can be reduced.

(Second Embodiment) FIG. 2 is a diagram showing a configuration of a rotor 21 to which a rotor structure of a synchronous motor according to a second embodiment of the present invention can be applied.

The feature of this embodiment is that, as shown in FIG. 2, the contact surface between the first rotor core 14 and the permanent magnet 12 shown in FIG. 1 is formed in a shape that is concave inward in the radial direction. The first rotor core 14 and the permanent magnet 12 are combined so as to engage in the circumferential direction. That is, the first magnet contact surface 14b of the first rotor core 14 is formed in a concave shape, one of the magnetic pole surfaces of the permanent magnet 12 is formed in a convex shape, and the concave shape and the convex shape are fitted to each other.

In such a rotor 21, the same effect as in the first embodiment is exhibited, and the contact surface between the first rotor core 14 and the permanent magnet 12 is formed in a shape to be engaged in the circumferential direction. In addition, the positioning of the permanent magnet 12 becomes easy. In addition, the size of the convex shape makes it easy to adjust the amount of the permanent magnet 12 used, which can contribute to an improvement in output-torque characteristics.

(Third Embodiment) FIG. 3 is a diagram showing a configuration of a rotor 31 to which a rotor structure of a synchronous motor according to a third embodiment of the present invention can be applied.

The feature of this embodiment is that, as shown in FIG. 3, the contact surface between the permanent magnet 12 and the second rotor core 13 shown in FIG. 2 is formed in a shape that is concave inward in the radial direction. The second rotor core 13 and the permanent magnet 12 are combined so as to engage in the circumferential direction. That is, the other magnetic pole surface of the permanent magnet 12 is formed in a concave shape, the second magnet contact surface 13b of the second rotor core 13 is formed in a convex shape, and the concave shape and the convex shape are fitted to each other.

In such a rotor 31, the same effect as in the first embodiment is exhibited, and the contact surface between the second rotor core 13 and the permanent magnet 12 is formed in a shape to be engaged in the circumferential direction. In addition, the positioning of the second rotor core 13 with respect to the permanent magnet 12 is facilitated. Further, the size of the convex shape makes it easy to increase the capacity of the second rotor core 13, which can contribute to the improvement of the output-torque characteristics.

(Fourth Embodiment) FIG. 4 is a diagram showing a configuration of a rotor 41 to which a rotor structure of a synchronous motor according to a fourth embodiment of the present invention can be applied.

The feature of the present embodiment is that, as shown in FIG. 4, the contact surface between the first rotor core 14 and the permanent magnet 12 shown in FIG. 1 is formed in a shape that is convex outward in the radial direction. Thus, the first rotor core 14 and the permanent magnet 12 are combined so as to engage with each other in the circumferential direction. That is, the first magnet contact surface 14b of the first rotor core 14 is formed in a convex shape (in the illustrated example, a shape having a convex portion at the center in the width direction of the first magnet contact surface 14b), and one magnetic pole of the permanent magnet 12 is formed. The surface is formed in a concave shape (in the illustrated example, a shape having a concave portion at the center in the width direction of one magnetic pole surface), and the convex shape and the concave shape are fitted to each other.

As described above, the contact surface between the first rotor core 14 and the permanent magnet 12 is formed into a shape that engages in the circumferential direction, so that the positioning of the permanent magnet 12 is facilitated. Also,
The size of the concave shape facilitates adjustment of the amount of the permanent magnet 12 to be used, which can contribute to improvement of output-torque characteristics.

(Fifth Embodiment) FIG. 5 is a diagram showing a configuration of a rotor 51 to which a rotor structure of a synchronous motor according to a fifth embodiment of the present invention can be applied.

A feature of the present embodiment is that, as shown in FIG. 5, the contact surface between the permanent magnet 12 and the second rotor core 13 shown in FIG. 2 is formed in a shape that is convex outward in the radial direction. Thus, the second rotor core 13 and the permanent magnet 12 are combined so as to engage with each other in the circumferential direction. That is, the other magnetic pole surface of the permanent magnet 12 is formed in a convex shape (in the illustrated example, a shape having a convex portion at the center in the width direction of the other magnetic pole surface), and the second magnet contact surface 13b of the second rotor core 13 is concave. It is formed in a shape (in the illustrated example, a shape having a concave portion at the center in the width direction of the second magnet contact surface 13b), and the convex shape and the concave shape are fitted to each other.

As described above, since the contact surface between the second rotor core 13 and the permanent magnet 12 is formed into a shape that engages in the circumferential direction, the positioning of the second rotor core 13 with respect to the permanent magnet 12 becomes easy. Also, depending on the size of the concave shape,
The capacity of the second rotor core 13 can be easily reduced, which can contribute to improvement of output-torque characteristics.

(Sixth Embodiment) FIG. 6 is a diagram showing a configuration of a rotor 61 to which a rotor structure of a synchronous motor according to a sixth embodiment of the present invention can be applied.

The feature of this embodiment is that, as shown in FIG. 6, the contact surface between the second rotor core 13 and the reinforcing member 15 shown in FIG. The second rotor core 13 and the reinforcing member 15 are combined so as to engage with each other in the circumferential direction. That is, the arc surface 13a of the second rotor core 13 has a concave shape (a shape having a concave portion at the center in the width direction of the arc surface 13a in the illustrated example).
And the inner peripheral surface of the reinforcing member 15 is formed in a convex shape (a shape having a convex portion in the illustrated example), and the concave shape and the convex shape are fitted to each other.

As described above, the arcuate surface 13a of the second rotor core 13 and the abutment surface of the reinforcing member 15 are formed into a shape that engages in the circumferential direction, so that the positioning of the second rotor core 13 with respect to the reinforcing member 15 can be easily performed. This makes it possible to assemble the second rotor core 13 while fitting the second rotor core 13 into the reinforcing member 15, thereby reducing the number of steps for manufacturing the rotor and facilitating the manufacture of the rotor.

(Seventh Embodiment) FIG. 7 is a diagram showing a configuration of a rotor 71 to which a rotor structure of a synchronous motor according to a seventh embodiment of the present invention can be applied.

The feature of the present embodiment is that, as shown in FIG. 7, the contact surface between the second rotor core 13 and the reinforcing member 15 shown in FIG. 3 is formed in a shape that is convex outward in the radial direction. Thus, the second rotor core 13 and the reinforcing member 15 are combined so as to engage with each other in the circumferential direction. That is, the arc surface 13a of the second rotor core 13 is formed in a convex shape (in the illustrated example, a shape having a convex portion at the center in the width direction of the arc surface 13a), and the inner peripheral surface of the reinforcing member 15 is formed in a concave shape (in the illustrated example, (A shape having a concave portion) and the convex shape and the concave shape are fitted to each other.

As described above, since the arcuate surface 13a of the second rotor core 13 and the contact surface of the reinforcing member 15 are formed in a shape that engages in the circumferential direction, the positioning of the second rotor core 13 with respect to the reinforcing member 15 can be easily performed. As a result, the second rotor core 13 can be assembled while the second rotor core 13 is being fitted to the reinforcing member 15, and the rotor can be easily manufactured. Also, depending on the size of the projection,
Since the amount of the second rotor core 13 can be easily increased, the reluctance torque generated at the convex portion can be easily increased, which can contribute to an improvement in output-torque characteristics.

(Eighth Embodiment) FIG. 8 is a diagram showing a configuration of a rotor 81 to which a rotor structure of a synchronous motor according to an eighth embodiment of the present invention can be applied.

The feature of this embodiment is that, as shown in FIG. 8, each of the second rotor cores 13 shown in FIG.
7 is provided. The hole 17 is filled with a non-magnetic material such as air or resin. When assembling the second rotor core 13 by laminating magnetic steel plates, the second rotor core 13 can be easily manufactured without using a special jig or a manufacturing method by using a guide passed through the hole 17.
Further, since the portion where each hole 17 is formed is not made of a magnetic steel plate material, the weight of the rotor 81 can be reduced. Therefore, the strength is improved by the reduction in weight, the rotation speed is increased,
This can contribute to downsizing.

A rod (bar) (not shown) made of a non-magnetic material (eg, resin) is inserted into the hole 17, and both ends of each bar are arranged at both ends in the axial direction of the rotor 81. By supporting with the end plate (not shown)
It is possible to further improve the strength and contribute to high rotation.

(Ninth Embodiment) A feature of the ninth embodiment is that when the magnetic steel plates are laminated to produce the second rotor core 13, the magnetic steel plates are bonded together and integrated. As described above, by manufacturing the second rotor core 13 by bonding, it is not necessary to use a special jig or manufacturing method for manufacturing the second rotor core 13, which can contribute to facilitation of manufacturing.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a first embodiment of the present invention can be applied;

FIG. 2 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a second embodiment of the present invention can be applied;

FIG. 3 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a third embodiment of the present invention can be applied;

FIG. 4 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a fourth embodiment of the present invention can be applied;

FIG. 5 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a fifth embodiment of the present invention can be applied.

FIG. 6 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a sixth embodiment of the present invention can be applied.

FIG. 7 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to a seventh embodiment of the present invention can be applied.

FIG. 8 is a diagram showing a configuration of a rotor to which a rotor structure of a synchronous motor according to an eighth embodiment of the present invention can be applied.

FIG. 9 is a diagram illustrating a configuration of a rotor according to the related art.

FIG. 10 is a diagram illustrating a configuration of a rotor according to another related art.

[Explanation of symbols]

11, 21, 31, 41, 51, 61, 71, 81 Rotor 12 Permanent magnet 13 Second rotor core 13a Arc surface 13b Second magnet contact surface 14 First rotor core 14a Arc surface 14b First magnet contact surface 15 Reinforcement member 16 Rotating shaft 17 holes

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H02K 19/10 H02K 19/10 A 21/14 21/14 M (72) Inventor Toshio Kikuchi Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa No. 2 Inside Nissan Motor Co., Ltd. (72) Inventor Masakazu Kobayashi No. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 5H002 AA07 AA09 AB07 AC04 AC06 AC09 AE08 5H619 AA01 AA07 BB01 BB24 PP02 PP06 PP08 5H621 BB07 HH01 HH08 HH09 JK02 JK05 5H622 AA03 CA02 CA07 CA13 CB04 CB05 PP11 PP16 PP18

Claims (7)

[Claims] A first rotor core having an arcuate surface having a predetermined radius from the center of the rotor and a first magnet contact surface alternately formed in a circumferential direction on an outer peripheral surface, and a rotating shaft fixed to the center of the rotor; A permanent magnet disposed with a magnetic pole surface in contact with the first magnet contact surface; an arc surface having the same radius as the predetermined radius; and a second magnet contact surface, wherein the second magnet contact surface A second rotor core disposed in contact with the other magnetic pole surface of the permanent magnet; and a second rotor core disposed on the outer peripheral portion of the rotor so as to contact an arc surface of the first rotor core and an arc surface of the second rotor core. A rotor structure for a synchronous motor, comprising: an annular reinforcing member made of a nonmagnetic material. 2. The device according to claim 1, wherein the first magnet contact surface of the first rotor core and one magnetic pole surface of the permanent magnet are formed in a shape engaging in a circumferential direction. Rotor structure of synchronous motor. 3. The permanent magnet according to claim 1, wherein the second magnet contact surface of the second rotor core and the other magnetic pole surface of the permanent magnet are formed so as to engage in a circumferential direction.
3. The rotor structure of the synchronous motor according to 1. 4. An arcuate surface of said second rotor core and a contact surface between said arcuate surface of said reinforcing member and said reinforcing surface are formed in a shape engaging in a circumferential direction. The rotor structure of the synchronous motor according to any one of the above. 5. The rotor structure of a synchronous motor according to claim 1, wherein said first rotor core and said second rotor core have a structure in which magnetic steel plates are laminated in the direction of said rotation axis. . 6. The rotor structure of a synchronous motor according to claim 5, wherein a hole serving as a guide when laminating the magnetic steel plates is formed in each magnetic steel plate constituting the second rotor core. 7. The rotor structure of a synchronous motor according to claim 5, wherein the magnetic steel plates constituting the second rotor core are bonded and integrated with each other.