JP6121859B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  2. Description of the Related Art Conventionally, a rotor used in a motor has a rotor core that has a plurality of claw-shaped magnetic poles in the circumferential direction and is combined, and a disc magnet (field magnet) is disposed between them to provide each claw-shaped magnetic pole. A so-called permanent magnet field Landel-type rotor that functions alternately on different magnetic poles is known (for example, see Patent Document 1).

  The rotor of Patent Document 1 includes an auxiliary magnet (back magnet) provided on the back surface of the claw-shaped magnetic pole, and an auxiliary magnet (claw-shaped magnetic pole) provided between the claw-shaped magnetic poles in the circumferential direction. All the magnets of the disk magnet are integrally molded in advance to suppress an increase in the number of parts.

JP 2013-118801 A

By the way, in the motor as described above, it is possible to suppress an increase in the number of parts by integrating all the magnets.
However, there is a problem that it is difficult to adjust the magnetic flux at each part in the magnet integrally formed in advance.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor and a motor that can easily adjust the magnetic flux while suppressing an increase in the number of components.

Each of the rotors that solve the above-described problems has a plurality of claw-shaped magnetic poles projecting radially outward at equal intervals on the outer periphery of a substantially disk-shaped core base and extending in the axial direction. Are arranged between the first and second rotor cores in which the claw-shaped magnetic poles are alternately arranged in the circumferential direction while being opposed to each other and the axial direction of the core bases, and are magnetized in the axial direction, whereby the first rotor core A disc magnet that causes the claw-shaped magnetic pole of the second rotor core to function as a second magnetic pole, a disc magnet that causes the claw-shaped magnetic pole of the second rotor core to function as the second magnetic pole, and a rectifying magnet having a machining gap magnet portion disposed in the gap that occurs in the circumferential direction between the claw-shaped magnetic poles, and a rear magnet portion disposed gap formed on a rear surface of the claw-shaped magnetic poles, the disc Magnet, inter-pole magnet part and back The magnet portion have different magnetization directions, the rectifier magnet and is composed of a material different from that of the disc magnet, together with the rectifier magnets are bonded magnet, the disc magnet sintered anisotropic a magnet, the rectifying magnet is integral with the disc magnet by an adhesive.

According to this configuration, since the rectifying magnet and the disc magnet are made of different materials, it is easy to adjust the magnetic flux in each part, and the output can be adjusted. Moreover, an increase in the number of parts can be suppressed by integrating the disc magnet and the rectifying magnet by bonding .

Each of the rotors that solve the above-described problems has a plurality of claw-shaped magnetic poles projecting radially outward at equal intervals on the outer periphery of a substantially disk-shaped core base and extending in the axial direction. Are arranged between the first and second rotor cores in which the claw-shaped magnetic poles are alternately arranged in the circumferential direction while being opposed to each other and the axial direction of the core bases, and are magnetized in the axial direction, whereby the first rotor core A disc magnet that causes the claw-shaped magnetic pole of the second rotor core to function as a second magnetic pole, a disc magnet that causes the claw-shaped magnetic pole of the second rotor core to function as the second magnetic pole, The disc includes an inter-pole magnet portion disposed in a gap generated in a circumferential direction between the claw-shaped magnetic poles and a rectifier magnet having a back magnet portion disposed in a gap generated on the back surface of the claw-shaped magnetic poles. Magnet, inter-pole magnet part and back The magnet part has a different magnetization direction, and the rectifier magnet and the disc magnet are made of different materials. The rectifier magnet is a bonded magnet, and the disc magnet is anisotropically sintered. a magnet, the disc magnet in a state sandwiched between the first and second rotor cores of the core base, and one conjugated to the rectifying magnet relative to the disc magnet the rectifying magnet insert molded.

According to this configuration, since the rectifying magnet and the disc magnet are made of different materials, it is easy to adjust the magnetic flux in each part, and the output can be adjusted. Moreover, the disk magnet and the rectifying magnet are integrated by the insert molding, so that an increase in the number of parts can be suppressed. Further, by insert-molding the rectifying magnet , the rectifying magnet can be molded and integrated with the disc magnet. Furthermore, since the rectifying magnet is directly formed on the disc magnet and each rotor core, for example, it is possible to suppress the occurrence of an adhesive layer or a mechanical air gap between the rectifying magnet and each rotor core. As a result, the permeance of the rotor is improved and the torque of the rotor can be secured.

According to the configuration of each of the above rotors , for example, even when the shape is complicated as a rectifying magnet including both a back magnet part and an interpole magnet part, the dimensional accuracy is higher than that of a sintered magnet, Since the degree of freedom of shape is high, it can be easily manufactured.

Further , according to the configuration of each of the rotors described above , the claw-shaped magnetic pole can be magnetized more reliably by configuring the disc magnet that acts as the magnetic pole with the claw-shaped magnetic pole as a sintered magnet having a relatively strong magnetic flux. It is possible to act as.

In the rotor, the commutation magnet is preferably Oriented direction is polar anisotropic orientation.
According to this structure, it can magnetize so that it may have a component of the optimal direction of a back magnet part and an interpole magnet part, respectively.

Moreover, the motor which solves the said subject has one of the said rotors, and the stator arrange | positioned facing this rotor.
According to this configuration, the same effects as described above can be achieved.

  According to the rotor and motor of the present invention, it is possible to easily adjust the magnetic flux while suppressing an increase in the number of parts.

It is a schematic block diagram of the motor in one Embodiment. It is a perspective view of the commutation magnet which comprises an integral magnet. It is a perspective view of the disc magnet which comprises an integral magnet. It is a disassembled perspective view which shows the components structure of a rotor. It is a perspective view of a rotor. FIG. 6 is a 6-6 cross-sectional view of the rotor in FIG. 5. It is a perspective view for demonstrating the shaping | molding method of the integral magnet in another example. It is a perspective view of the integral magnet in another example.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor 10 according to the present embodiment includes a stator 11 and a rotor 21 that is disposed in the stator 11 so as to face the stator 11 and is rotatably supported.

  The stator 11 has a stator core 11a and a winding 11b wound around the teeth of the stator core 11a. The stator 11 generates a rotating magnetic field that rotates the rotor 21 when a drive current is supplied to the winding 11b.

  As shown in FIG. 1 and FIG. 4, the rotor 21 includes a pair of rotor cores 23 and 24 that are fixed to the rotary shaft 22 while maintaining a distance in the axial direction by press-fitting the rotary shaft 22. And an integral magnet 25 sandwiched between the rotor cores 23 and 24.

  The rotor core 23 is formed on the outer peripheral portion of a substantially disk-shaped core base 23a, with a plurality of (five in the present embodiment) claw-shaped magnetic poles 23b protruding radially outward and extending in the axial direction at equal intervals. Has been. Specifically, the claw-shaped magnetic pole 23b has a protrusion 23c that protrudes radially outward from the outer periphery of the core base 23a, and a claw 23d that is provided at the tip of the protrusion 23c and extends in the axial direction. The protrusion 23c is formed in a fan shape when viewed from the axial direction. The claw portion 23d has a fan-shaped cross section in the direction perpendicular to the axis.

  As shown in FIGS. 3 and 4, the rotor core 24 has the same shape as the rotor core 23, and a plurality of claw-shaped magnetic poles 24b are arranged on the outer periphery of the substantially disc-shaped core base 24a at equal intervals on the outer side in the radial direction. It protrudes and extends in the axial direction. Specifically, the claw-shaped magnetic pole 24b has a protrusion 24c that protrudes radially outward from the outer periphery of the core base 24a, and a claw 24d that is provided at the tip of the protrusion 24c and extends in the axial direction. The protrusion 24c is formed in a fan shape when viewed from the axial direction, like the protrusion 23c of the rotor core 23. The claw portion 24d has a fan-shaped cross section in the direction perpendicular to the axis. Further, the claw portion 24 d of one rotor core 24 is configured to be longer in the axial direction than the claw portion 23 d of the other rotor core 23. Incidentally, the rotor core 23 corresponds to a first rotor core, and the rotor core 24 corresponds to a second rotor core.

  The rotor shafts 23 and 24 are respectively press-fitted with the rotary shafts 22 in the central holes thereof, and the distances on the outer sides (opposite sides) of the core bases 23a and 24a are set in advance. The rotary shaft 22 is press-fitted and fixed. At this time, the rotor core 24 is configured so that the claw-shaped magnetic pole 24b is disposed between the claw-shaped magnetic poles 23b of the other rotor core 23 adjacent in the circumferential direction, and between the core base 23a and the core base 24a. Is assembled (attached) to the rotor core 23.

  The integrated magnet 25 includes a disk magnet 26 and a rectifying magnet 27. The integrated magnet 25 is configured by integrating a rectifier magnet 27 with a disk magnet 26 by post-processing such as bonding. The disc magnet 26 and the rectifying magnet 27 are made of different materials.

As shown in FIG. 3, the disc magnet 26 is formed in an annular shape having a central hole.
The disc magnet 26 causes the claw-shaped magnetic pole 23b of the rotor core 23 to function as a first magnetic pole (N pole in the present embodiment), and the claw-shaped magnetic pole 24b of the rotor core 24 serves as a second magnetic pole (S pole in the present embodiment). Is magnetized in the axial direction so as to function as That is, the rotor 21 of the present embodiment is a so-called Landel type rotor using the disc magnet 26. The rotor 21 has five claw-shaped magnetic poles 23b serving as N poles and five claw-shaped magnetic poles 24b serving as S poles arranged alternately in the circumferential direction, and has 10 poles (5 pole pairs). It becomes.

The disc magnet 26 is, for example, an anisotropic sintered magnet, and is composed of, for example, a ferrite magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.
As shown in FIGS. 2, 5, and 6, the rectifying magnet 27 has back magnet portions 28 and 29 and an interpole magnet portion 30. The rectifying magnet 27 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of, for example, a ferrite magnet, a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, a neodymium magnet, or the like.

  As shown in FIGS. 5 and 6, the back magnet portions 28 and 29 are located between the back surface 23 e (surface on the radially inner side) of each claw-shaped magnetic pole 23 b of the rotor core 23 and the outer peripheral surface 24 f of the core base 24 a of the rotor core 24. , And the back surface 24e of each claw-shaped magnetic pole 24b of the rotor core 24 and the outer peripheral surface 23f of the core base 23a of the rotor core 23.

  One of the back magnet portions 28 has a claw-shaped magnetic pole 23b that is in contact with the back surface 23e on the side opposite to the claw-shaped magnetic pole 23b and has the same polarity as that of the claw-shaped magnetic pole 23b. Magnetized so as to be the south pole of the pole.

  The other back magnet portion 29 is magnetized so that the side that contacts the back surface 24e of the claw-shaped magnetic pole 24b is the S pole and the side that contacts the outer peripheral surface 23f of the core base 23a of the rotor core 23 is the N pole.

  The interpolar magnet unit 30 is disposed between the claw-shaped magnetic pole 23b and the claw-shaped magnetic pole 24b in the circumferential direction. The interpolar magnet portion 30 is magnetized in the circumferential direction so that the claw-shaped magnetic pole 24b side of the rotor core 24 is an S pole and the claw-shaped magnetic pole 23b side of the rotor core 23 is an N pole.

Next, the operation of the motor of this embodiment will be described.
In the motor 10 of this embodiment, when a driving current is supplied to the winding 11b, a rotating magnetic field is generated in the stator 11, and the rotor 21 is driven to rotate.

  Here, in the rotor 21 of the present embodiment, the rectifying magnet 27 and the disc magnet 26 are made of different materials. For this reason, compared with the case where the rectifier magnet 27 and the disc magnet 26 are made of the same material, the magnetic flux can be easily adjusted. Further, since the rectifying magnet 27 and the disc magnet 26 are integrated by post-processing, an increase in the number of parts can be suppressed. Further, since the rectifying magnet 27 has the interpolar magnet portion 30 and the back magnet portions 28 and 29, the magnetic flux of the rotor 21 compared to the rectifying magnet having only one of the interpole magnet portion 30 and the back magnet portions 28 and 29. As the amount increases, the flow of magnetic flux of the disk magnet 26 is adjusted, which can contribute to the improvement of the output of the rotor 21.

Next, the effect of this embodiment will be described.
(1) Since the rectifying magnet 27 and the disc magnet 26 are made of different materials, the magnetic flux can be easily adjusted at each portion, and the output can be adjusted. Further, the disk magnet 26 and the rectifying magnet 27 are integrated by post-processing, so that an increase in the number of parts can be suppressed.

  (2) Since the rectifying magnet 27 is a bonded magnet, even if the back magnet portions 28 and 29 and the interpole magnet portion 30 are both provided and the shape becomes complicated, the sintered magnet However, since the dimensional accuracy is high and the degree of freedom of shape is high, it can be easily manufactured.

  (3) The disc magnet 26 that acts as the magnetic poles with the claw-shaped magnetic poles 23b and 24b is composed of a sintered magnet having a relatively strong magnetic flux, so that the claw-shaped magnetic poles 23b and 24b are more reliably magnetized and act as magnetic poles. It becomes possible to make it.

In addition, you may change the said embodiment as follows.
-In above-mentioned embodiment, although the integrated magnet 25 was set as the structure which integrated the rectifier magnet 27 with the disk magnet 26 by adhesion | attachment, it is not restricted to this. For example, as shown in FIG. 7, the integrated magnet 25 is formed by insert-molding a rectifying magnet 27 in a state where the disk magnet 26 is sandwiched between the rotor cores 23, 24, and the rectifying magnet 27 is placed behind the disk magnet 26. You may employ | adopt the structure integrated by a process. By insert-molding the rectifying magnet 27, the rectifying magnet 27 can be molded and integrated with the disc magnet 26. Further, since the rectifying magnet 27 is directly formed on the disc magnet 26 and the rotor cores 23 and 24, for example, an adhesive layer and a mechanical air gap are generated between the rectifying magnet 27 and the rotor cores 23 and 24. Can be suppressed. As a result, the permeance of the rotor 21 is improved and the torque of the rotor 21 can be secured.

  -Like the integrated magnet 25 shown in FIG. 8, the magnetizing aspect of the rectifier magnet 27 which functions in an auxiliary manner with respect to the disc magnet 26 that generates the main magnetic flux may be polar anisotropic orientation. More specifically, the integrated magnet 25 has a magnetic flux radially inward from the outer surface of the S-pole back magnet portion 29 toward the outer surface of the N-pole back magnet portion 28 via the adjacent interpole magnet portion 30. Magnetization of so-called polar anisotropic orientation, which flows curvedly in a convex shape, is performed. As a result, the back magnet portions 28 and 29 have a radial component magnetic flux, and the inter-pole magnet portion 30 has a circumferential component magnetic flux, which functions in the same manner as the integrated magnet 25 of the above embodiment. The portions 28 and 29 and the interpole magnet portion 30 can be magnetized so as to have components in optimum directions.

In the above embodiment, the rectifier magnet 27 has the interpolar magnet portion 30 and the back magnet portions 28 and 29. However, a configuration having at least one of these may be adopted.
In the above embodiment, each of the claw-shaped magnetic poles 23b and 24b is five and the rotor has ten poles. However, the present invention is not limited to this, and may be changed as appropriate.

In the above embodiment, ten inter-pole magnet portions 30 and ten back magnet portions 28 and 29 are used in total. However, the number may be appropriately changed according to the number of claw-shaped magnetic poles 23b and 24b.
In the above embodiment, the disc magnet 26 is a sintered magnet and the rectifying magnet 27 is a bonded magnet.

  -The material of the disc magnet 26 and the rectifying magnet 27 of the above embodiment is not limited to that shown in the above embodiment, and can be changed as appropriate if different materials are used for the disc magnet 26 and the rectifying magnet 27. Also good.

  -You may combine the said embodiment and each modification suitably.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Stator, 21 ... Rotor, 23a ... Core base, 23b ... Claw-shaped magnetic pole, 24a ... Core base, 24b ... Claw-shaped magnetic pole, 26 ... Disc magnet, 27 ... Rectifier magnet, 28 ... Back magnet part 29 ... back magnet part, 30 ... interpolar magnet part.

Claims (4)

A plurality of claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of each substantially disk-shaped core base, and the claw-shaped magnetic poles are formed with the core bases facing each other. First and second rotor cores arranged alternately in the circumferential direction;
The claw-shaped magnetic poles of the first rotor core function as the first magnetic poles by being arranged between the axial directions of the core bases and magnetized in the axial direction, and the claw-shaped magnetic poles of the second rotor core are made to function as the first magnetic poles. A disc magnet that functions as a second magnetic pole;
An interpole magnet portion disposed in a gap generated in a circumferential direction between the claw-shaped magnetic pole of the first rotor core and a claw-shaped magnetic pole of the second rotor core, and a back surface disposed in a gap generated on the back surface of the claw-shaped magnetic pole and a rectifying magnet having a magnet portion,
The disk magnet, the interpolar magnet part and the back magnet part have different magnetization directions from each other,
The rectifier magnet and the disc magnet are made of different materials, the rectifier magnet is a bond magnet, and the disc magnet is an anisotropic sintered magnet,
The rectifying magnet rotor, characterized in that is integrated with the circular plate magnet by an adhesive. A plurality of claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of each substantially disk-shaped core base, and the claw-shaped magnetic poles are formed with the core bases facing each other. First and second rotor cores arranged alternately in the circumferential direction;
The claw-shaped magnetic poles of the first rotor core function as the first magnetic poles by being arranged between the axial directions of the core bases and magnetized in the axial direction, and the claw-shaped magnetic poles of the second rotor core are made to function as the first magnetic poles. A disc magnet that functions as a second magnetic pole;
An interpole magnet portion disposed in a gap generated in a circumferential direction between the claw-shaped magnetic pole of the first rotor core and a claw-shaped magnetic pole of the second rotor core, and a back surface disposed in a gap generated on the back surface of the claw-shaped magnetic pole A rectifier magnet having a magnet part,
The disk magnet, the interpolar magnet part and the back magnet part have different magnetization directions from each other,
The rectifier magnet and the disc magnet are made of different materials, the rectifier magnet is a bond magnet, and the disc magnet is an anisotropic sintered magnet,
Wherein the disc magnets in a state sandwiched between the first and second rotor cores of the core base, the rotor, characterized in that it has one conjugated said rectifying magnet relative to the disc magnet the rectifying magnet insert molded. The rotor according to claim 1 or 2 ,
Rotor, wherein the rectifying magnets Oriented direction is polar anisotropic orientation. A motor comprising the rotor according to any one of claims 1 to 3 and a stator disposed to face the rotor.