JP5731251B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor having a continuous pole type (half magnet type) structure and a motor including the rotor.

  As the rotor used in the motor, for example, as shown in Patent Document 1, a plurality of magnet magnetic pole portions in which permanent magnets having one polarity are arranged in the circumferential direction of the rotor core are formed, and the rotor core A so-called consequent pole type rotor is known in which the pseudo magnetic pole portion formed integrally is disposed with a gap between each magnet magnetic pole portion, and the pseudo magnetic pole portion functions as the other magnetic pole.

  Further, in the rotor, the permanent magnet is disposed on the outer peripheral surface of the rotor core, and the holding member is mounted on the rotor core so as to abut on the outer peripheral surface of the permanent magnet. The movement is restricted and scattering is prevented.

JP 2010-252554 A

  However, in the rotor configured as described above, if the position of the permanent magnet is shifted not only in the radial direction but also in the axial direction for some reason, the rotational performance of the motor may be affected. Therefore, it is required to hold the permanent magnet more securely in the axial direction.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor capable of more reliably holding a permanent magnet, and a motor including the rotor.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of magnet magnetic pole portions which are arranged in a state where the permanent magnet is restricted in movement in the radial direction and constitute one polarity are formed in the circumferential direction of the rotor core. In addition, in the rotor configured such that the pseudo magnetic pole portion integrally formed with the rotor core is disposed with a gap between the magnet magnetic pole portions, and the pseudo magnetic pole portion functions as the other magnetic pole, both sides in the axial direction of the rotor core holding member mounted before Symbol Rotako a Te smell abuts axially the ends of the permanent magnet is configured to restrict the axial movement of the permanent magnet in the holding member, said rotor core A plurality of core sheets made of magnetic metal plates are laminated in the axial direction, and the permanent magnets are inserted into magnet housing holes formed so as to extend in the axial direction. The thin-walled portion is formed with a higher magnetic resistance by forming a thinner wire than the other portions in the radial connecting portions located on both sides in the circumferential direction of the permanent magnet at the periphery of the magnet housing hole, The holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member is provided with a core fixing portion formed extending in the axial direction, and the tip of the core fixing portion The gist is that the engaging portion provided in the portion is inserted into the gap between the thin portions of the core sheets laminated in the axial direction, engaged with the thin portion, and attached to the rotor core .

In the present invention, so-called in the rotor of the consequent pole structure, the permanent magnets arranged in the magnet pole portion while being moved restricted radially retaining member mounted axially on both sides smell of the rotor core Te in Russia Tako A Comes into contact with each end in the axial direction and movement in the axial direction is restricted. As a result, the permanent magnets arranged on the rotor are restricted not only in the radial movement as in the prior art but also in the axial direction by the holding members on both sides in the axial direction, so that the permanent magnet can be held more reliably. Can do. As a result, the possibility that the position of the permanent magnet is shifted can be extremely reduced, and the rotation performance of the motor can be maintained well.

  In this invention, the rotor core is formed by laminating a plurality of core sheets of magnetic metal plate material, and is provided at the radial connection portions located on both sides in the circumferential direction of the permanent magnet at the periphery of the magnet accommodation hole into which the permanent magnet is inserted and arranged. Is formed with a thin portion that increases the magnetic resistance in order to reduce the leakage magnetic flux at that portion. The holding member provided for each magnet magnetic pole portion for restricting the movement of the permanent magnet in the axial direction is formed by the engaging portion of the core fixing portion extending in the axial direction of the core sheet laminated in the axial direction. It is inserted into the gap between the thin portions, engaged with the thin portions, and attached to the rotor core. Thereby, since the core fixing | fixed part of a holding member is engaged using the thin part which reduces the above leakage magnetic flux, it is not necessary to provide a means for mounting | wearing (engaging) a holding member separately in a rotor core. .

According to a second aspect of the present invention , a plurality of magnet magnetic pole portions, which are arranged in a state in which the permanent magnet is restricted in movement in the radial direction and constitute one polarity, are formed in the circumferential direction of the rotor core, and are formed integrally with the rotor core. In the rotor configured so that the pseudo magnetic pole portion is arranged with a gap between the magnet magnetic pole portions, and the pseudo magnetic pole portion functions as the other magnetic pole, the holding is attached to the rotor core on both sides in the axial direction of the rotor core. A member is in contact with each axial end of the permanent magnet, and the holding member restricts the axial movement of the permanent magnet, and the rotor core is formed so as to extend in the axial direction. The permanent magnet is inserted and disposed in the accommodation hole, and the holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member includes A core fixing portion extending in the direction is provided, and the fitting connecting portion provided at the tip of the core fixing portion is connected to the fitting connecting portion of the core fixing portion of the holding member on the other side in the axial direction. The gist is that it is mounted on the rotor core.
According to the present invention, in the so-called consequent pole type rotor, the permanent magnets arranged in the magnet magnetic pole portion in a state in which movement is restricted in the radial direction are such that the holding members attached to the rotor core on both sides in the axial direction of the rotor core are in the axial direction. Axial movement is restricted by contacting each end. As a result, the permanent magnets arranged on the rotor are restricted not only in the radial movement as in the prior art but also in the axial direction by the holding members on both sides in the axial direction, so that the permanent magnet can be held more reliably. Can do. As a result, the possibility that the position of the permanent magnet is shifted can be extremely reduced, and the rotation performance of the motor can be maintained well.

  In this invention, the holding member provided for each magnet magnetic pole portion to restrict the movement of the permanent magnet in the axial direction is such that the fitting connection portion at the tip portion of the core fixing portion extending in the axial direction is on the other side in the axial direction. The holding member is connected to the fitting connecting portion of the core fixing portion and attached to the rotor core. Accordingly, it is necessary to separately provide means for attaching the holding member to the rotor core by attaching the holding members provided on both sides in the axial direction of the magnet magnetic pole portion to the rotor core by connecting the fitting connection portions to each other. Absent.

According to a third aspect of the present invention, a plurality of magnet magnetic pole portions that are arranged in a state in which the permanent magnet is restricted in movement in the radial direction and that constitute one polarity are formed in the circumferential direction of the rotor core, and are integrally formed with the rotor core. In the rotor in which the pseudo magnetic pole portion is arranged with a gap between the magnet magnetic pole portions, and the pseudo magnetic pole portion functions as the other magnetic pole, the rotating shaft of the rotor and the rotor on both sides in the axial direction of the rotor core A holding member attached to at least one of the rotor cores is configured to abut against each axial end of the permanent magnet, and the holding member is configured to restrict movement of the permanent magnet in the axial direction. The permanent magnet is inserted into a magnet housing hole formed so as to extend in the direction, and a gap is created between the peripheral edge of the magnet housing hole and the permanent magnet in the circumferential direction. The holding member is provided with a magnet fixing portion formed to extend in the axial direction, and the magnet fixing portion is inserted into a gap between the permanent magnet and the peripheral edge of the magnet receiving hole of the rotor core. The gist of the invention is that the permanent magnet is held from the circumferential direction.
According to the present invention, in a so-called consequent pole type rotor, the permanent magnets arranged on the magnet magnetic pole portion in a state in which movement is restricted in the radial direction are provided on at least one of the rotor rotation shaft and the rotor core on both sides in the axial direction of the rotor core. The holding member to be mounted comes into contact with each end portion in the axial direction and movement in the axial direction is restricted. As a result, the permanent magnets arranged on the rotor are restricted not only in the radial movement as in the prior art but also in the axial direction by the holding members on both sides in the axial direction, so that the permanent magnet can be held more reliably. Can do. As a result, the possibility that the position of the permanent magnet is shifted can be extremely reduced, and the rotation performance of the motor can be maintained well.
Further, the rotor core is configured such that a gap is formed between the permanent magnet and the periphery of the magnet receiving hole in the circumferential direction, and the gap increases the magnetic resistance between the periphery of the magnet receiving hole and the permanent magnet and leaks. Magnetic flux is reduced. And the magnet fixing | fixed part of a holding member is comprised so that it may be inserted in the clearance gap between a permanent magnet and the periphery of the magnet accommodation hole of a rotor core, and may hold | maintain a permanent magnet from the circumferential direction. Thereby, the movement of the permanent magnet in the circumferential direction can be restricted and held while reducing the leakage magnetic flux by configuring the holding member (magnet fixing portion) to be nonmagnetic or having a high magnetic resistance of the magnet fixing portion. it can.
According to a fourth aspect of the present invention, in the rotor according to any one of the first to third aspects, a gap is formed between the peripheral edge of the magnet housing hole and the permanent magnet in the rotor core in the circumferential direction. The holding member is inserted into a gap between the permanent magnet and a peripheral edge of the magnet housing hole of the rotor core so that the holding member is attached to the rotor core. The gist is that the permanent magnet is configured to be held from the circumferential direction.

  In the present invention, the rotor core is configured such that a gap is formed between the peripheral edge of the permanent magnet and the permanent magnet in the circumferential direction, and the gap increases the magnetic resistance between the peripheral edge of the permanent magnet and the permanent magnet. The leakage magnetic flux is reduced. Then, the core fixing portion of the holding member is inserted into the gap between the permanent magnet and the periphery of the magnet housing hole of the rotor core so as to be attached to the rotor core, and at the core fixing portion, the permanent magnet is inserted from the circumferential direction. Configured to hold. As a result, the holding member is also attached to the core fixing portion, and the holding member (core fixing portion) is made nonmagnetic or has a high magnetic resistance of the core fixing portion, thereby reducing the leakage magnetic flux and surrounding the permanent magnet. The movement with respect to the direction can also be restricted and held.

According to a fifth aspect of the present invention , a plurality of magnet magnetic pole portions, which are arranged in a state in which the permanent magnet is restricted in movement in the radial direction and constitute one polarity, are formed in the circumferential direction of the rotor core, and are formed integrally with the rotor core. In the rotor configured so that the pseudo magnetic pole portion is arranged with a gap between the magnet magnetic pole portions, and the pseudo magnetic pole portion functions as the other magnetic pole, the holding is attached to the rotor core on both sides in the axial direction of the rotor core. A member abuts on each axial end of the permanent magnet, and the holding member restricts movement of the permanent magnet in the axial direction. The pseudo magnetic pole portion follows the direction of the magnetic flux in the radial direction. A slit having a magnetic flux rectifying function is formed, and the holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member It is provided a core fixing portion formed to extend in the axial direction, and its gist in that the core fixing section is attached to the rotor core is inserted into the slit.
According to the present invention, in the so-called consequent pole type rotor, the permanent magnets arranged in the magnet magnetic pole portion in a state in which movement is restricted in the radial direction are such that the holding members attached to the rotor core on both sides in the axial direction of the rotor core are in the axial direction. Axial movement is restricted by contacting each end. As a result, the permanent magnets arranged on the rotor are restricted not only in the radial movement as in the prior art but also in the axial direction by the holding members on both sides in the axial direction, so that the permanent magnet can be held more reliably. Can do. As a result, the possibility that the position of the permanent magnet is shifted can be extremely reduced, and the rotation performance of the motor can be maintained well.

  In the present invention, the pseudo magnetic pole portion is provided with a slit that is formed along the direction of the magnetic flux in the radial direction and has a magnetic flux rectifying function. The holding member provided for each magnet magnetic pole portion for restricting the movement of the permanent magnet in the axial direction is attached to the rotor core by inserting a core fixing portion extending in the axial direction into the slit. Thus, by using the slit for rectifying the magnetic flux as described above for mounting the holding member, it is not necessary to separately provide a means for mounting the holding member on the rotor core.

A sixth aspect of the present invention is a motor including the rotor according to any one of the first to fifth aspects.
According to the present invention, it is possible to provide a motor in which the permanent magnets arranged on the magnet magnetic pole portion of the rotor are more reliably held.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor which can hold | maintain a permanent magnet more reliably, and a motor provided with the rotor can be provided.

It is a top view of the motor in a 1st embodiment. It is a disassembled perspective view of the rotor in 1st Embodiment. (A) is the elements on larger scale of the rotor in 1st Embodiment, (b) is the sectional view on the AA line of (a). (A) is a top view of the rotor core in 1st Embodiment, (b) is the BB sectional drawing of (a). (A) is a top view of the cover member in 1st Embodiment, (b) is a side view of a cover member. (A) is the elements on larger scale of the rotor in 2nd Embodiment, (b) is CC sectional view taken on the line of (a), (c) is a top view of a cover member, (d) is a side view of a cover member. is there. (A) is the elements on larger scale of the rotor in 3rd Embodiment, (b) is the DD sectional view taken on the line of (a), (c) is a top view of a cover member, (d) is a side view of a cover member. is there. (A) is the elements on larger scale of the rotor in 4th Embodiment, (b) is the EE sectional view taken on the line of (a), (c) is a top view of a cover member, (d) is a side view of a cover member. is there. (A) is the elements on larger scale of the rotor in 5th Embodiment, (b) is the FF sectional view taken on the line of (a), (c) is a top view of a cover member, (d) is a side view of a cover member. is there. It is a disassembled perspective view of the rotor in 6th Embodiment. (A) is the elements on larger scale of the rotor in 6th Embodiment, (b) is GG sectional drawing of (a), (c) is a top view of a cover member, (d) is a side view of a cover member. is there. It is a schematic block diagram of the rotor and rotating shaft in 7th Embodiment. It is a disassembled perspective view of the rotor in 7th Embodiment.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, a brushless motor (hereinafter simply referred to as a motor) 10 of the present embodiment is an inner rotor type in which a rotor 21 is rotatably accommodated inside a substantially annular stator 11. Has been. The stator 11 has a substantially cylindrical stator core 12 formed by laminating a plurality of magnetic metal plate materials, and is wound 12 around the 12 teeth 12a provided at equal angular intervals on the stator core 12 by concentrated winding. It consists of a single winding magnetic pole 13.

  The rotor 21 disposed inside the stator 11 has a substantially annular rotor core 23 fixed to the rotating shaft 22. The rotor core 23 is configured by laminating a plurality of core sheets 24 (16 in the present embodiment) made of magnetic metal plates in the axial direction and connecting them by caulking. The rotor core 23 is provided with a press-fitting hole 23a in a central portion in the radial direction, and is fixed to the rotary shaft 22 by press-fitting the rotary shaft 22 into the press-fitting hole 23a. The rotor core 23 is formed with four convex magnet magnetic pole portions 25 protruding outward in the radial direction at intervals of 90 ° in the circumferential direction of the outer peripheral portion. Each magnet magnetic pole part 25 is formed with a substantially rectangular parallelepiped fitting hole 25a so that the longitudinal direction is the axial direction. A substantially rectangular parallelepiped permanent magnet 26 is inserted and embedded in each fitting hole 25a, and the motor 10 is configured as a so-called embedded magnet type motor. Each fitting hole 25a is formed such that the width L1 in the orthogonal direction of the magnetic pole center line passing through the center in the circumferential direction of the magnet magnetic pole portion 25 is longer than that of the permanent magnet 26, and the rotor core 23 has a peripheral edge of the fitting hole 25a. The permanent magnet 26 is configured such that a gap S1 is formed between the radial coupling portion 25b that is located on both sides in the circumferential direction of the permanent magnet 26 and is integrally formed with the rotor core 23.

  Each permanent magnet 26 is magnetized so that the radially outer side is an N pole and the radially inner side is an S pole, and the magnet magnetic pole portion 25 is configured as an N pole magnetic pole. In addition, between the magnet magnetic pole portions 25, convex pseudo magnetic pole portions 27 that are integrally formed on the outer peripheral portion of the rotor core 23 and protrude radially outward are spaced from the magnet magnetic pole portions 25 in a predetermined area when viewed from the axial direction. Is formed. That is, the magnet magnetic pole portions 25 and the pseudo magnetic pole portions 27 are alternately arranged at equiangular (45 °) intervals. The rotor 21 is configured as a so-called continuous pole type having eight magnetic poles by causing the pseudo magnetic pole portion 27 to function as the S pole with respect to the N magnetic pole portion 25.

  The rotor 21 of the present embodiment has cover members 31 on both axial sides of the rotor core 23, and the cover member 31 is composed of a plurality of members provided in each of the magnet magnetic pole portions 25. Each cover member 31 is disposed opposite to the permanent magnet 26 in the axial direction. As shown in FIG. 3 (a), each cover member 31 disposed in the magnet magnetic pole portion 25 is embedded in each fitting hole 25a and the axial end portion of the permanent magnet 26 whose movement in the radial direction is restricted. The movement of the permanent magnet 26 in the axial direction is restricted.

  Here, as shown in FIGS. 4 (a) and 4 (b), the rotor core 23 is formed to be thinner than the other portions in the radial direction connecting portions 25b of each core sheet 24, and the thin portion 25c is configured to have a higher magnetic resistance. Is formed. Each thin portion 25c is formed in a thin shape by being recessed from one end in the axial direction of the core sheet 24 toward the other end. The core sheet 24 is laminated so that the recessed portions of the thin portions 25c face each other in the axial direction, and a plurality of (eight in this embodiment) gaps are formed between the thin portions 25c of the core sheets 24 of the magnetic pole portion 25. S2 is generated. Each gap S2 communicates with the fitting hole 25a (gap S1).

  As shown in FIGS. 5A and 5B, each cover member 31 is made of, for example, a non-magnetic material (for example, a metal such as brass or a resin) as a preferable material, and holds a magnet formed in a substantially rectangular plate shape. It is comprised from the part 32 and a pair of core fixing | fixed part 33 extended from the edge part of this magnet holding | maintenance part 32 in the orthogonal direction. The magnet holding part 32 is formed to have the same length in the longitudinal direction as the width in the direction perpendicular to the magnetic pole center line of the magnet magnetic pole part 25, and the core fixing part 33 is provided at the end part in the longitudinal direction. ing. Further, the magnet holding portion 32 is formed so that the width in the short direction is slightly longer than the width in the radial direction of the fitting hole 25a. In the core fixing portion 33, the length L2 in the orthogonal direction of the magnet holding portion 32 is set to a length from the axial end portion of the rotor core 23 to a predetermined number of gaps S2 (third in the axial direction in this embodiment). Has been. The core fixing portion 33 is provided with an engaging portion 34 that is formed inwardly along the longitudinal direction of the magnet holding portion 32 and is configured to face each other at the tip portion thereof.

  As shown in FIG. 3B, in each cover member 31, the core fixing portion 33 is inserted into the gap K from the axial direction, and the engaging portion 34 of the core fixing portion 33 is in the gap S <b> 2 of the magnet magnetic pole portion 25. It is inserted from the circumferential direction and engaged with the thin portion 25c, and the inner side surface 32a of the magnet holding portion 32 is mounted so as to contact the axial end surface 26a of the permanent magnet 26. Further, the engaging portion 34 of each core fixing portion 33 is inserted through the gap S2 to reach the gap S1, the tip end surface 34a is brought into contact with the circumferential side surface 26b of the permanent magnet 26, and the permanent magnet 26 is fixed from the circumferential direction. It is configured as follows.

  In the rotor 21 configured as described above, there is a concern that noise may increase due to air flowing into the gap S2 between the magnetic pole portions 25 as the rotor 21 rotates. In such a case, Even if it exists, by sufficiently providing the length L2 (see FIG. 5B) of the core fixing portion 33 of the cover member 31 so as to block each gap S2, the inflow of air into the gap S2 is reduced. It can be expected that an increase in noise is suppressed.

Next, characteristic effects of the present embodiment will be described.
(1) In the rotor 21 of this embodiment of the continuous pole type, the permanent magnets 26 accommodated in the fitting holes 25a of the magnet magnetic pole portions 25 of the rotor core 23 and restricted in the radial direction are arranged on both sides of the rotor core 23 ( The axial movement is restricted by the cover member 31 engaged with the thin portion 25c of the core sheet 24). As a result, the permanent magnets 26 arranged on the rotor core 23 are not only restricted in the radial movement but also restricted in the axial direction by the cover members 31 on both axial sides, so that the permanent magnet 26 can be held more reliably. Can do. As a result, the possibility that the position of the permanent magnet 26 is shifted can be extremely reduced, and the rotation performance of the motor 10 can be maintained well.

  (2) The magnet magnetic pole portion 25 and the pseudo magnetic pole portion 27 of the present embodiment are formed in a shape protruding outward in the radial direction of the rotor core 23, and each cover member 31 is not in contact with the pseudo magnetic pole portion 27. It is attached to the magnetic pole part 25 so as to be. Here, when the cover member 31 is shaped to straddle the magnet magnetic pole portion 25 and the pseudo magnetic pole portion 27, a part of the magnetic flux generated from the magnet magnetic pole portion 25 (permanent magnet 26) is simulated via the cover member 31. In order to avoid the leakage magnetic flux short-circuited to the magnetic pole portion 27, the material of the cover member 31 is limited to be made of a nonmagnetic material. On the other hand, in this embodiment, even if the cover member 31 is made of a magnetic material by attaching the cover member 31 to the rotor core 23 so as not to contact the pseudo magnetic pole portion 27, Since the leakage magnetic flux that can be generated through the cover member 31 can be suppressed, the degree of freedom in selecting the material of the cover member 31 is increased.

  (3) The magnet magnetic pole portion 25 is formed in a shape protruding outward in the radial direction of the rotor core 23, and the cover member 31 is provided only in a portion corresponding to the magnet magnetic pole portion 25. Thereby, by providing the cover member 31 limited to the magnet magnetic pole part 25, the material required for the structure of the cover member 31 can be reduced, and the manufacturing cost can be reduced.

  Further, the rotor 21 of the present embodiment is configured as a so-called continuous pole type, and the number of magnet magnetic pole portions 25 having permanent magnets 26 is larger than that of a conventional rotor configuration in which all magnetic poles are magnet magnetic pole portions 25. It is half. Therefore, by applying the cover member 31 of the present embodiment to the consequent pole type rotor configuration, the material necessary for the configuration of the cover member 31 can be reduced more.

  (4) The rotor core 23 is formed by laminating a plurality of core sheets 24 of magnetic metal plate material, and is connected in the radial direction at the periphery of the fitting hole 25a in which the permanent magnet 26 is embedded at both sides in the circumferential direction of the permanent magnet 26. The portion 25b is formed with a thin portion 25c that increases the magnetic resistance in order to reduce the leakage magnetic flux at that portion. Here, in the embedded magnet type rotor 21 in which the permanent magnet 26 is embedded in the fitting hole 25 a of the rotor core 23, the leakage magnetic flux is generated in the radial direction connecting portion 25 b connected in the radial direction at the peripheral edge of the end portion of the permanent magnet 26. Can occur. On the other hand, in the present embodiment, the leakage magnetic flux that can be generated in the radial connecting portion 25b is reduced by providing the thin portion 25c to increase the magnetic resistance. The cover member 31 provided for each magnet magnetic pole portion 25 for restricting the movement of the permanent magnet 26 in the axial direction is formed by laminating the engaging portions 34 of the core fixing portion 33 extending in the axial direction. The core sheet 24 is inserted into the gap S <b> 2 between the thin portions 25 c, is engaged with the thin portions 25 c, and is attached to the rotor core 23. Thus, the rotor core 23 is provided with means for mounting (engaging) the cover member 31 in order to engage the core fixing portion 33 of the cover member 31 using the thin portion 25c that reduces the leakage magnetic flux as described above. There is no need to provide it separately.

  (5) Each fitting hole 25a is formed such that the width L1 in the orthogonal direction of the magnetic pole center line passing through the center in the circumferential direction of the magnet magnetic pole portion 25 is longer than that of the permanent magnet 26. In FIG. 2, a gap S1 is formed between the radial coupling portion 25b and the permanent magnet 26. The gap S1 increases the magnetic resistance between the peripheral edge of the fitting hole 25a and the permanent magnet 26, thereby reducing the leakage flux. Is done. Then, the engaging portion 34 of each core fixing portion 33 passes through the gap S2 and reaches the gap S1, and the tip end surface 34a is brought into contact with the circumferential side surface 26b of the permanent magnet 26 to fix the permanent magnet 26 from the circumferential direction. doing. Accordingly, the cover member 31 is also attached at the core fixing portion 33, and the cover member 31 (core fixing portion 33) is made nonmagnetic or has a high magnetic resistance of the core fixing portion 33, thereby reducing leakage magnetic flux. The movement of the permanent magnet 26 in the circumferential direction can also be restricted and held.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The main difference between the present embodiment and the first embodiment is only a change in the configuration in which the magnet fixing portion 35 is provided on the cover member 31. For this reason, for convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

  As shown in FIGS. 6A and 6B, in the rotor 21 of the present embodiment, the cover member 31 is provided with a magnet fixing portion 35, and the magnet fixing portion 35 is connected to the permanent magnet 26 and the radial connection portion 25 b. The permanent magnet 26 is held from the circumferential direction by being inserted into the gap S1 between the two in the axial direction. As shown in FIGS. 6C and 6D, the magnet holding portion 32 of the cover member 31 extends in the orthogonal direction (axial direction) from the magnet holding portion 32 according to the position of the gap S1 on both sides in the longitudinal direction. Each of the formed plate-like magnet fixing portions 35 is provided. The magnet fixing part 35 is formed so that the radial width is equal to the core fixing part 33 and the axial length is shorter than the core fixing part 33. Further, in the core fixing portion 33 of the cover member 31, the protruding length of each engaging portion 34 is slightly shorter than that of the first embodiment.

  As shown in FIG. 6B, each cover member 31 attached to the magnet magnetic pole portion 25 has a side surface 35 a inside the magnet fixing portion 35 inserted in the gap S <b> 1 as a side surface 26 b in the circumferential direction of the permanent magnet 26. The outer side surface 35b is in contact with the inner side surface 25d of the radial connecting portion 25b of the rotor core 23, and the engaging portion 34 of each core fixing portion 33 is inserted into the gap S2 of the rotor core 23 from the circumferential direction, so that the thin portion It is fixed to engage with 25c.

Next, characteristic effects of the present embodiment will be described.
(1) The cover member 31 of the present embodiment is provided with magnet fixing portions 35 that are formed extending in the axial direction on both sides in the longitudinal direction of the magnet holding portion 32. In the cover member 31, the magnet fixing portion 35 is fitted into the gap S1 and comes into contact with the permanent magnet 26 and the radial connecting portion 25b, and the engaging portion 34 of the core fixing portion 33 is inserted into the gap S2 of the rotor core 23 from the circumferential direction. It is inserted and fixed so as to engage with the thin portion 25c. Thereby, by using the nonmagnetic cover member 31, the movement of the permanent magnet 26 in the circumferential direction is restricted and held by the magnet fixing portion 35 of the cover member 31 while reducing the leakage magnetic flux. Can do.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. The main difference between the present embodiment and the first embodiment is only a change in the configuration in which the core fixing portion 33 of the cover member 31 is used as the core fixing portion 41. For this reason, for convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

  As shown in FIGS. 7 (a) and 7 (b), the rotor 21 of the present embodiment fits the core fixing portion 41 of the cover member 31 into the gap S1 between the permanent magnet 26 and the radial connecting portion 25b from the axial direction. The permanent magnet 26 is held from the circumferential direction by being inserted. The cover member 31 is configured such that the longitudinal width of the magnet holding portion 32 is formed to the same length as the fitting hole 25a, and the core fixing portion 41 is positioned at the gap S1. As shown in FIGS. 7C and 7D, the core fixing portion 41 is formed so that the thickness on the distal end side is thinner than that on the proximal end side. The engaging portion 42 provided at the distal end portion of the core fixing portion 41 is formed outward along the longitudinal direction of the magnet holding portion 32, and the axial end portion of the engaging portion 42 is a hemisphere. It is formed in a rounded shape. The cover member 31 configured in this manner has a rounded end portion that allows the tip portion to tilt in the circumferential direction when the engaging portion 42 is engaged with the thin portion 25c. As a result, the friction with the thin portion 25c is relieved, and the mounting operation is facilitated.

  As shown in FIG. 7B, each cover member 31 attached to the magnet magnetic pole portion 25 has a permanent magnet on the inner side surface 41a in the thick portion on the proximal end side of the core fixing portion 41 inserted in the gap S1. 26, the outer side surface 41b contacts the side surface 25d of the radial connecting portion 25b of the rotor core 23, and the engaging portion 42 is inserted into the gap S2 of the rotor core 23 from the inner side in the circumferential direction. It is fixed so as to engage with the thin portion 25c.

Next, characteristic effects of the present embodiment will be described.
(1) In the cover member 31 of the present embodiment, the core fixing portion 41 is inserted into the gap S1, and the engaging portion 42 is inserted into the gap S2 from the inner side in the circumferential direction, and is engaged and fixed to the thin portion 25c. . Thereby, by using the nonmagnetic cover member 31, the movement of the permanent magnet 26 in the circumferential direction is restricted and held by the core fixing portion 41 of the cover member 31 while reducing the leakage magnetic flux. Can do.

  (2) The cover member 31 of the present embodiment is configured so that the longitudinal width of the magnet holding portion 32 is formed to the same length as the fitting hole 25a, and the core fixing portion 41 is positioned at the gap S1. . Accordingly, the permanent magnet 26 can be held without the core fixing portion 41 of the cover member 31 protruding from the circumferential end portion of the magnet magnetic pole portion 25 into the gap K.

  (3) The cover member 31 is formed such that the core fixing portion 41 is thinner at the distal end side than at the proximal end side. The engaging portion 42 of the core fixing portion 41 is formed outward along the longitudinal direction of the magnet holding portion 32, and the axial end portion of the engaging portion 42 is rounded in a hemispherical shape. It is formed in a different shape. Thereby, the attachment work of the core fixing | fixed part 41 becomes easy.

(Fourth embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. The main difference between the present embodiment and the second embodiment is only a change in the configuration in which the engaging portion 34 of the core fixing portion 33 is used as the fitting connection portion 44. For this reason, for convenience of explanation, the same parts as those in the second embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

  As shown in FIGS. 8A and 8B, in the rotor 21 of this embodiment, the core fixing portion 33 provided in each cover member 31 is inserted into the gap K from the axial direction. As shown in FIGS. 8 (c) and 8 (d), each cover member 31 is provided with a fitting connection portion 44 at the tip portion of the core fixing portion 33, and the fitting connection portion of the cover member 31 on the other side in the axial direction. 44 and are connected to each other. In addition, the axial length of the core fixing portion 33 and the magnet fixing portion 35 is formed to be half of the axial length of the rotor core 23.

  As shown in FIG. 8B, the cover members 31 are fixed by fitting the fitting connection portions 44 of the cover members 31 facing each other in the axial direction. Further, in the cover member 31 attached to the magnet magnetic pole portion 25, the side surface 35a of the magnet fixing portion 35 fitted in the gap S1 contacts the side surface 26b of the permanent magnet 26, and the side surface 35b is the side surface of the radial coupling portion 25b. The front end surface 35c in the axial direction is in contact with each other and is fixed.

Next, characteristic effects of the present embodiment will be described.
(1) In the cover member 31 of the present embodiment, the fitting connection portion 44 provided at the tip portion of the core fixing portion 33 is mutually connected to the fitting connection portion 44 of the core fixing portion 33 of the cover member 31 on the other side in the axial direction. It is fitted and fixed to the magnetic pole part 25. As a result, the cover members 31 provided on both sides in the axial direction of the magnet magnetic pole portion 25 are attached to the rotor core 23 by connecting the fitting connection portions 44 to each other, thereby providing means for attaching the cover member 31 to the rotor core. 23 need not be provided separately.

(Fifth embodiment)
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. The main difference between the present embodiment and the fourth embodiment is only a change in the configuration in which the fitting connecting portion 44 is provided at the tip portion of the magnet fixing portion 35 and the function as a core fixing portion is provided. For this reason, for convenience of explanation, the same parts as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 9A and 9B, in the rotor 21 of the present embodiment, the magnet fixing portion 35 provided in each cover member 31 is inserted into the gap S1 from the axial direction, and the permanent magnet 26 is circumferentially moved. Hold from. As shown in FIGS. 9C and 9D, each cover member 31 is provided with a fitting connection portion 44 at the tip portion of the magnet fixing portion 35. Incidentally, the axial length of the core fixing portion 33 is formed to be short enough to be inserted into the gap K and engaged with the radial connecting portion 25b.

  As shown in FIG. 9B, each cover member 31 attached to the magnet magnetic pole portion 25 has the magnet fixing portion 35 inserted into the gap S1, and the fitting connecting portion 44 of the magnet fixing portion 35 is inserted into each other. Is fixed.

Next, characteristic effects of the present embodiment will be described.
(1) In the cover member 31 of the present embodiment, the magnet fixing portion 35 is fitted into the gap S1, and the fitting connecting portions 44 of the magnet fixing portion 35 are fitted into each other and fixed. Thereby, it is not necessary to separately provide a means for attaching the cover member 31 to the rotor core 23, and the movement of the permanent magnet 26 in the circumferential direction can be regulated and held while reducing the leakage magnetic flux.

(Sixth embodiment)
A sixth embodiment embodying the present invention will be described below with reference to FIGS. The main difference between this embodiment and the first embodiment is only a change in the configuration in which the pseudo magnetic pole portion 27 of the rotor core 23 is provided with the slit 27a and the configuration in which the cover member 31 is the cover member 51. For this reason, for convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

  As shown in FIG. 10, the rotor 21 of the present embodiment is provided with a slit 27 a having a magnetic flux rectifying function at a circumferential intermediate portion of each pseudo magnetic pole portion 27 of the rotor core 23. A pair of slits 27 a having the same shape is provided at positions that are axisymmetric with respect to the magnetic pole center line of the pseudo magnetic pole portion 27. The pair of slits 27 a are provided such that the circumferential interval between the pair of slits 27 a increases slightly from the inner peripheral side to the outer peripheral side of the rotor core 23. The slit 27a has a substantially rectangular shape when viewed from the axial direction, and penetrates the rotor core 23 in the axial direction.

  Here, the rotor 21 of the consequent pole type structure as in the present embodiment is a magnetic pole in which a permanent magnet 26 having a magnetic force forcing (induction) and a pseudo magnetic pole portion 27 having no magnetic force forcing are mixed. Since it is configured, magnetic disturbance is likely to occur. On the other hand, in the present embodiment, the slit 27a is formed in each pseudo magnetic pole portion 27, whereby the magnetic flux in the pseudo magnetic pole portion 27 is rectified and magnetic disturbance can be suppressed. And the cover member 51 of this embodiment is comprised so that the core fixing | fixed part 53 provided in the magnet holding | maintenance part 52 may be inserted in the slit 27a.

  As shown in FIGS. 11A and 11B, the magnet holding portion 52 of the cover member 51 has a pseudo magnetic pole so that both side portions in the longitudinal direction bend at the circumferential end of the magnet magnetic pole portion 25 and cover the gap K. The core 27 is extended to the position of the slit 27a of the portion 27, and the core fixing portion 53 is inserted into the slit 27a. In the rotor 21 of the present embodiment, the core fixing portion 53 of the cover member 51 is inserted into the slit 27a from the axial direction, and the magnet fixing portion 54 is fitted in the gap S1 between the permanent magnet 26 and the radial connecting portion 25b. Thus, the permanent magnet 26 is held from the circumferential direction.

  As shown in FIGS. 11C and 11D, the core fixing portion 53 is formed to extend in the axial direction at the end portion of the magnet holding portion 52 bent at the circumferential end portion of the magnet magnetic pole portion 25. The magnet fixing portion 54 is configured by a projecting portion in which the magnet holding portion 52 is recessed from one side surface in the axial direction and protrudes to the other side surface according to the position of the gap S1.

  As shown in FIG. 11B, each cover member 51 attached to the magnet magnetic pole portion 25 has a magnet fixing portion 54 fitted in the gap S1 and a radial connection between the circumferential side surface 26b of the permanent magnet 26 and the rotor core 23. While being in contact with the side surface 25d of the portion 25b, the core fixing portion 33 is inserted into the slit 27a of the pseudo magnetic pole portion 27 and fixed so as to engage with the slit 27a. Further, the inner side surface 52 a of the magnet holding portion 52 is fixed so as to abut on the end surface 26 a in the axial direction of the permanent magnet 26.

Next, characteristic effects of the present embodiment will be described.
(1) In the rotor 21 of the present embodiment, a pair of slits 27 a having a magnetic flux rectifying function are provided at the circumferential intermediate portion of each pseudo magnetic pole portion 27 of the rotor core 23. The cover member 51 provided for each magnet magnetic pole portion 25 for restricting the axial movement of the permanent magnet 26 has a core fixing portion 53 extending in the axial direction and inserted into the slit 27a. It is engaged and fixed to the rotor core 23. Thus, by using the slit 27a for rectifying the magnetic flux for mounting the cover member 51, it is not necessary to separately provide a means for mounting the cover member 31 in the rotor core 23.

  (2) The magnet fixing portion 54 of the present embodiment is configured by a protruding portion in which the magnet holding portion 52 is recessed from one side surface in the axial direction and protrudes to the other side surface according to the position of the gap S1. Thereby, for example, when the cover member 51 is formed from a plate-like metal, the magnet fixing portion 54 can be easily formed by press working or the like.

  (3) In each cover member 51, the core fixing portion 33 is fixed to the slit 27 a provided in the pseudo magnetic pole portion 27. Thereby, it is also possible to employ a strong fixing means such as press-fitting without considering the influence on the permanent magnet 26.

(Seventh embodiment)
A seventh embodiment embodying the present invention will be described below with reference to FIGS. The main difference between the present embodiment and the first embodiment is only a change in the configuration in which the cover member 31 is used as the cover member 61. For this reason, for convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof is omitted.

  As shown in FIGS. 12 and 13, the cover member 61 of the present embodiment includes a pair of cover members 61 provided on both sides in the axial direction of the rotor core 23 and formed in a substantially disc shape. Each cover member 61 is provided with a fixing hole 61a in a central portion in the radial direction. The cover member 61 is fixed to the rotating shaft 22 by press-fitting the rotating shaft 22 into each fixing hole 61a. Both cover members 61 are fixed so as to be integrally rotatable with the rotary shaft 22 and the rotor core 23 when the rotary shaft 22 is press-fitted.

  Each cover member 61 has four convex magnet holding portions 62 projecting in the radial direction in accordance with the magnet magnetic pole portion 25 on the outer peripheral portion at intervals of 90 ° in the circumferential direction. Each cover member 61 is configured by omitting portions corresponding to the pseudo magnetic pole portion 27 and the gap K between the magnet holding portions 62. The rotor 21 is mounted on the rotary shaft 22 so that the cover member 61 is not in contact with the pseudo magnetic pole portion 27, and the inner side surface 62 a of the magnet holding portion 62 is on the axial end surface 26 a of the permanent magnet 26. It is fixed so that it abuts.

Next, characteristic effects of the present embodiment will be described.
(1) In the rotor 21 of the present embodiment, the end portions in the axial direction of the permanent magnets 26 of the magnet magnetic pole portions 25 can be held by the substantially disc-shaped cover members 61 provided on both sides in the axial direction of the rotor core 23. it can. Thereby, the number of parts of the cover member 61 can be reduced and the permanent magnet 26 can be held more reliably.

  (2) Each cover member 61 of this embodiment is attached to the rotating shaft 22 of the rotor 21 so as not to contact the pseudo magnetic pole portion 27 of the rotor core 23. Thereby, even if the cover member 61 is made of a magnetic material, the leakage magnetic flux that can be generated through the cover member 61 can be suppressed, so that the degree of freedom in selecting the material of the cover member 61 is increased.

In addition, you may change embodiment of this invention as follows.
-You may form the cover members 31 and 51 of each said embodiment by the press work of metal plate materials. In this case, the cover member 51 having the magnet fixing portion 35 corresponds to the position of the cover member 51 changed to the periphery of the magnet holding portion 32.

  In each of the above embodiments, each cover member 31, 51, 61 is fixed (attached) to either the rotating shaft 22 or the rotor core 23 of the rotor 21, but fixed to both the rotating shaft 22 and the rotor core 23. You may change to the structure to do.

  -In each said embodiment, the shape of each cover member 31,51,61 is an example, For example, the cover member 51 is formed in cyclic | annular form in the structure which makes the cover member 31 of the axial direction both sides asymmetric, and 6th Embodiment. You may change a structure suitably, such as a structure.

  In each of the above embodiments, the permanent magnet 26 of the rotor 21 is applied to the rotor 21 of the so-called embedded magnet type motor 10 embedded in the fitting hole 25a of each magnet magnetic pole portion 25. However, the present invention is not limited to this. For example, the present invention may be applied to a rotor configuration in which the movement of the permanent magnet 26 outward in the radial direction is restricted by the attachment of a cover member or the like.

-In each said embodiment, you may change into the structure which abbreviate | omitted clearance gap S1 between the permanent magnet 26 and the radial direction connection part 25b.
-In the said 4th-7th embodiment, you may change into the structure which does not form the thin part 25c of the rotor core 23. FIG. Moreover, in the said 1st-3rd embodiment, you may provide the thin part 25c, for example only in the core sheet 24 of the position where the engaging part 34 of the core fixing | fixed part 33 engages.

  In each of the above embodiments, for example, a resin material may be filled from the thin portion 25c of the magnet magnetic pole portion 25 and the magnet magnetic pole portion 25 including the gap S1 may be molded with the resin material. Thereby, the permanent magnet 26 can be held more reliably.

  In each of the above embodiments, the rotor core 23 and the stator core 12 are configured by stacking magnetic metal plate materials. However, the core is not limited to such a stacked core, and may be configured by molding magnetic powder, for example. .

In the above embodiments, the number of magnetic poles of the rotor 21 and the number of magnetic poles of the stator 11 are examples, and may be changed as appropriate.
-In each above-mentioned embodiment, although stator 11 was constituted by concentrated winding to each tooth 12a, it may be changed to the structure wound distributedly with the increase in the number of each tooth 12a.

In each of the above embodiments, each permanent magnet 26 is arranged so that its radially outer surface is an N pole, but may be changed so that its radially outer side is an S pole.
In each of the above embodiments, the present invention is applied to the rotor 21 used in the inner rotor type motor 10, but may be applied to the rotor of an outer rotor type motor. In this case, the opposing relationship in the radial direction between the rotor and the stator is reversed.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 21 ... Rotor, 22 ... Rotating shaft, 23 ... Rotor core, 24 ... Core sheet, 25 ... Magnet magnetic pole part, 25a ... Fitting hole (magnet accommodation hole), 25b ... Radial direction connection part, 25c ... Thin part , 26 ... permanent magnet, 27 ... pseudo magnetic pole part, 27a ... slit, 31, 51, 61 ... cover member (holding member), 33, 41, 53 ... core fixing part, 34, 42 ... engagement part, 35, 54 ... magnet fixing part, 44 ... fitting connection part, K ... gap, L1 ... width, S1, S2 ... gap.

Claims (6)

A plurality of magnet magnetic pole portions that are arranged in a state in which the permanent magnets are restricted in movement in the radial direction and constitute one polarity are formed in the circumferential direction of the rotor core, and the pseudo magnetic pole portions that are integrally formed with the rotor core are each magnetic pole portion. In the rotor arranged with a gap between the parts, and configured to function the pseudo magnetic pole part as the other magnetic pole,
As the holding member attached to the front Symbol Rotako A Te axial sides smell of the rotor core is in contact with the axial each end of the permanent magnet, to restrict the axial movement of the permanent magnet in the holding member Configured ,
The rotor core is formed by laminating a plurality of core sheets formed of a magnetic metal plate in the axial direction, and the permanent magnets are arranged in magnet receiving holes formed to extend in the axial direction. The sheet is formed with a thin-walled portion configured to have a higher magnetic resistance by forming it thinner than the other portions in the radial connecting portions located on both sides in the circumferential direction of the permanent magnet at the periphery of the magnet housing hole,
The holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member is provided with a core fixing portion formed extending in the axial direction. A rotor characterized in that an engaging portion provided at a tip portion is inserted in a gap between thin portions of the core sheets laminated in the axial direction, engaged with the thin portions, and attached to the rotor core . A plurality of magnet magnetic pole portions that are arranged in a state in which the permanent magnets are restricted in movement in the radial direction and constitute one polarity are formed in the circumferential direction of the rotor core, and the pseudo magnetic pole portions that are integrally formed with the rotor core are each magnetic pole portion. In the rotor arranged with a gap between the parts, and configured to function the pseudo magnetic pole part as the other magnetic pole,
A holding member attached to the rotor core on both axial sides of the rotor core is in contact with each axial end of the permanent magnet, and the holding member is configured to restrict movement of the permanent magnet in the axial direction.
The rotor core is disposed by inserting the permanent magnet into a magnet accommodation hole formed to extend in the axial direction,
The holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member is provided with a core fixing portion formed extending in the axial direction. A rotor characterized in that a fitting connection portion provided at a tip portion is connected to a fitting connection portion of a core fixing portion of a holding member on the other side in the axial direction and is attached to the rotor core. A plurality of magnet magnetic pole portions that are arranged in a state in which the permanent magnets are restricted in movement in the radial direction and constitute one polarity are formed in the circumferential direction of the rotor core, and the pseudo magnetic pole portions that are integrally formed with the rotor core are each magnetic pole portion. In the rotor arranged with a gap between the parts, and configured to function the pseudo magnetic pole part as the other magnetic pole,
A holding member attached to at least one of the rotating shaft of the rotor and the rotor core on both sides in the axial direction of the rotor core abuts on each axial end of the permanent magnet, and the holding member extends in the axial direction of the permanent magnet. Configured to regulate movement,
The rotor core is configured such that the permanent magnet is inserted into a magnet housing hole formed so as to extend in the axial direction, and a gap is formed between a peripheral edge of the magnet housing hole and the permanent magnet in the circumferential direction. And
The holding member is provided with a magnet fixing portion formed so as to extend in the axial direction, and the magnet fixing portion is inserted into a gap between the permanent magnet and a peripheral edge of the magnet receiving hole of the rotor core to surround the permanent magnet. A rotor configured to be held from a direction. The rotor according to any one of claims 1 to 3 ,
The rotor core is configured such that a gap is generated between a peripheral edge of the magnet accommodation hole and the permanent magnet in a circumferential direction,
The holding member is configured such that the core fixing portion is inserted into a gap between the permanent magnet and a peripheral edge of the magnet housing hole of the rotor core to be attached to the rotor core, and the permanent magnet is attached to the core fixing portion. A rotor configured to be held from a circumferential direction. A plurality of magnet magnetic pole portions that are arranged in a state in which the permanent magnets are restricted in movement in the radial direction and constitute one polarity are formed in the circumferential direction of the rotor core, and the pseudo magnetic pole portions that are integrally formed with the rotor core are each magnetic pole portion. In the rotor arranged with a gap between the parts, and configured to function the pseudo magnetic pole part as the other magnetic pole,
A holding member attached to the rotor core on both axial sides of the rotor core is in contact with each axial end of the permanent magnet, and the holding member is configured to restrict movement of the permanent magnet in the axial direction.
The pseudo magnetic pole part is provided along a radial magnetic flux direction and provided with a slit having a magnetic flux rectifying function,
The holding member is composed of a plurality of members provided in each of the magnet magnetic pole portions, and each holding member is provided with a core fixing portion formed extending in the axial direction. A rotor inserted into the slit and mounted on the rotor core. A motor comprising the rotor according to any one of claims 1 to 5 .

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