JP2010259304A - Rotor and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor, capable of optimizing the constitution and configuration structure in each of constituting units and increasing effective flux content leading to contribute to the high output of a motor, in a unit constituted by combining a plurality of constituting units with different configuration structure of magnets. <P>SOLUTION: The rotor 10 is constituted by a first constituting unit 10A of a normal SPM structure fixing the magnets 12n, 12s of both poles at the outer peripheral surface of a rotor core 11, and a second constituting unit 10B of a consequent-pole structure fixing the magnet 14n of one pole at the outer peripheral surface of the rotor core 13 and forming the magnet of another pole by a core magnet-pole unit 13a; the magnets 12n, 12s, 14n in the constituting units 10A, 10B, fixed at the outer peripheral surfaces of the rotor cores 11, 13, are covered by a cover member 15 as a shatterproof means; and at the same time, the first constituting unit 10A is divided into two portions to dispose each of the divided first configuration units 10A, on both sides in the axial direction of the second constituting unit 10B. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor formed by combining a plurality of components having different magnet arrangement structures, and a motor including the rotor.

  As a rotor used in a motor, for example, as shown in FIG. 5 of Patent Document 1, a rotor having an SPM structure in which magnets of both magnetic poles are fixed to an outer peripheral surface of a rotor core, As shown in Fig. 8, the magnet used from the viewpoint of resource saving, low cost, etc. is only a single magnetic pole, the amount of use is halved, and it is composed of the magnet and the core magnetic pole part formed in the rotor core A rotor having a consequent pole structure is known.

JP 2008-125203 A

  By the way, the present inventor has a plurality of different magnet arrangement structures such as a constituent part of a continuous pole type structure composed of a single magnetic pole magnet and a core magnetic pole part, and a constituent part of a normal structure using both magnetic pole magnets. We are considering the construction of a rotor in which the components are combined in the axial direction. At that time, how to provide a cover member in each component for the purpose of preventing the magnet from peeling off or preventing a part of the magnet from being scattered, etc. The effective magnetic flux has increased, and it has not been fully examined whether the motor output can be increased.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to optimize the configuration and arrangement of each component in a combination of a plurality of components having different magnet arrangement structures. Therefore, it is an object of the present invention to provide a rotor that can contribute to an increase in the effective magnetic flux amount and, consequently, an increase in motor output, and a motor including the rotor.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a first component portion in which N-pole and S-pole magnets are alternately fixed to the outer peripheral surface of the rotor core in the circumferential direction, and one on the outer peripheral surface of the rotor core. The magnet of the magnetic pole on the side is fixed in the axial direction with the same magnetic pole as that of the first component, and the rotor core is provided with a core magnetic pole part that functions as the magnetic pole on the other side. Are arranged with gaps alternately in the circumferential direction, and cover means for covering at least a magnet fixed to the outer peripheral surface of the rotor core, the first component is divided into two parts, and the second It is the rotor arrange | positioned at the axial direction both sides of a structure part, respectively.

  In the present invention, a first SPM structure component in which both pole magnets are fixed to the outer peripheral surface of the rotor core, and a single pole magnet is fixed to the outer peripheral surface of the rotor core and the other pole is configured by the core magnetic pole portion. Using the second component of the Quantpole structure, the magnet of each component fixed to the outer peripheral surface of the rotor core is covered with cover means to prevent scattering, and the first component is divided into two parts. The first component is arranged on each side of the second component in the axial direction. That is, leakage magnetic flux that escapes in the axial direction is likely to be generated at the axial end of the rotor, and the magnetic field is slightly weakened at the core magnetic pole in the continuous pole type structure. Incurs an increase. Taking this into account, the first component of the normal structure is divided and arranged on both sides in the axial direction of the second component of the consequent pole type structure. Most of the magnetic flux is aligned in the radial direction, and the leakage magnetic flux that escapes in the axial direction is reduced. Thereby, an effective magnetic flux increases and it can contribute to the high output of a motor.

  According to the second aspect of the present invention, the N-pole and S-pole magnets are alternately inserted in the circumferential direction in the rotor core, or the magnetic pole magnet on one side is inserted in the rotor core, and the other side is inserted in the rotor core. A first magnetic pole portion provided with a core magnetic pole portion functioning as a magnetic pole of the rotor, and a magnetic pole magnet on one side are fixed to the outer peripheral surface of the rotor core side by side in the axial direction between the first magnetic pole portion and the same magnetic pole, The rotor core is provided with a core magnetic pole portion that functions as a magnetic pole on the other side, and the magnet and the core magnetic pole portion are fixed to the outer peripheral surface of the rotor core, and a second component in which gaps are alternately arranged in the circumferential direction. Cover means for covering at least the magnet, wherein the cover means is provided only for the second component, the first component is divided into two, and the axial direction of the second component While it is disposed on both sides, a rotor that is configured to expand so that the outer diameter of the first component coincides with the outer diameter of the cover means provided in the second component.

  In this invention, the first component part of the IPM structure in which the magnet is inserted into the rotor core, and the first pole of the continuous pole type structure in which the single pole magnet is fixed to the outer peripheral surface of the rotor core and the other pole is composed of the core magnetic pole part. And the magnet of only the second component fixed to the outer peripheral surface of the rotor core is covered with the cover means to prevent scattering, and the first component is divided into two and each first component Are respectively arranged on both sides in the axial direction of the second component, and further expanded so that the outer diameter of the first component coincides with the outer diameter of the cover means provided on the second component. That is, leakage magnetic flux that escapes in the axial direction is likely to be generated at the axial end of the rotor, and the magnetic field is slightly weakened at the core magnetic pole in the continuous pole type structure. Incurs an increase. Considering this, the first component part of the IPM structure is divided and arranged on both sides in the axial direction of the second component part of the consequent pole type structure, and the outer diameter of the first component part that does not require the cover means is enlarged and configured. By doing so, the magnetic separation distance from the stator at the axial end of the rotor is reduced, and the leakage magnetic flux escaping in the axial direction is reduced. Thereby, an effective magnetic flux increases and it can contribute to the high output of a motor.

  According to a third aspect of the present invention, in the rotor according to the first or second aspect, the cover means is configured in a cylindrical shape with a nonmagnetic metal plate, and is attached to the target component by external fitting. The gist of this is.

  In this invention, a cover means is comprised by the cylinder shape with a nonmagnetic metal board | plate material so that it may mount | wear with the component part used as object by external fitting. Thereby, a cover means can be comprised easily and mounting | wearing to a rotor becomes easy.

  According to a fourth aspect of the present invention, in the rotor according to any one of the first to third aspects, the shape of each of the magnets of the first and second components arranged in the axial direction is the same shape. The gist of this is that it is configured.

  In this invention, it is comprised so that the shape of the axial view of each magnet of the 1st and 2nd structure part arranged in an axial direction may become the same shape. As a result, it is possible to form a magnet that extends beyond each component and contribute to a reduction in the number of components.

A fifth aspect of the present invention is a motor including the rotor according to any one of the first to fourth aspects.
In this invention, by providing the rotor described above, the leakage magnetic flux is reduced, the effective magnetic flux amount is increased, and the output of the motor is increased.

  According to the present invention, in a configuration in which a plurality of components having different magnet arrangement structures are combined, the configuration and arrangement of each component are optimized to increase the effective magnetic flux, and thus to increase the output of the motor. The rotor which can contribute and the motor provided with the rotor can be provided.

The schematic structure of the rotor in 1st Embodiment is shown, (a) is radial direction sectional drawing of a 1st structure part, (b) is radial direction sectional drawing of a 2nd structure part, (c) is an axial direction sectional view of a rotor. It is. The schematic structure of the rotor in 2nd Embodiment is shown, (a) is radial direction sectional drawing of a 1st structure part, (b) is radial direction sectional drawing of a 2nd structure part, (c) is an axial direction sectional view of a rotor. It is. The schematic structure of the rotor in 3rd Embodiment is shown, (a) is radial direction sectional drawing of a 1st structure part, (b) is radial direction sectional drawing of a 2nd structure part, (c) is an axial direction sectional view of a rotor. It is.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
Fig.1 (a)-(c) shows the rotor 10 of this embodiment used for an inner rotor type brushless motor. The rotor 10 is configured by combining two configurations of the first component 10A and the second component 10B in the axial direction. Specifically, the rotor 10 has a length of about 3/4 of the total axial length. On the both sides in the axial direction of the second constituent part 10B having a thickness, the first constituent part 10A obtained by further dividing the remaining 1/4 into two parts is connected. The rotor 10 has the same axial length as the stator (not shown).

  In the first component 10A, an annular rotor core 11 made of a magnetic metal material is used, and a pair of rotor cores 11 having a length of about 1/8 of the entire axial length of the rotor 10 is used. . Each rotor core 11 is integrally connected to both axial sides of the rotor core 13 of the second component 10B described later. The outer peripheral surface of each rotor core 11 has an SPM structure in which a total of six magnets 12n and 12s of N poles and S poles are fixed so that the magnetic poles are alternately arranged in the circumferential direction, and the number of magnetic poles is “6”. It is configured as. The magnets 12n and 12s are configured to have a constant thickness in the shape of an arc having an angle range of about 60 ° when viewed in the axial direction, and are formed in the axial direction to have the same axial length as each rotor core 11, with an equal angular interval of 60 °. Are arranged side by side. Between each magnet 12n and 12s, the space | gap S1 equivalent in the circumferential direction is each provided.

  In the second component 10B, a substantially annular rotor core 13 made of a magnetic metal material and having three core magnetic pole portions (saliency poles) 13a at equal angular intervals of 120 ° is used. A length of about 3/4 of the total of 10 axial lengths is used. The rotor core 13 is connected to each core 11 so as to be sandwiched between the rotor cores 11 of the first component 10A on both sides in the axial direction.

  The core magnetic pole portion 13a formed integrally with the rotor core 13 is formed in the same arc shape as the magnet 12n and the like in the axial direction, and has the same axial length as the rotor core 13 in the axial direction. The core magnetic pole part 13a is arranged so as to be aligned in the axial direction (so that the magnetic pole centers coincide) with the S-pole magnet 12s of the first component part 10A. In the recesses between the core magnetic pole portions 13a of the rotor core 11, a total of three magnets 14n having only N poles are fixed and arranged at equal angular intervals of 120 °. The magnet 14n is formed in the same arc shape as the magnet 12n and the like in the axial direction, and has the same axial length as the rotor core 13 in the axial direction, and is aligned with the magnet 12n in the axial direction (the magnetic pole centers coincide with each other). (May be integrated with the magnet 12n). Also in the second component 10B, the number of magnetic poles by the N-pole magnet 14n is “3”, and the number of magnetic poles of the core magnetic pole part 13a (so-called continuous pole) functioning as the S-pole is “3”, which is “6” in total. A magnetic pole is formed. In addition, similar gaps S1 are provided in the circumferential direction between the core magnetic pole portion 13a and the magnet 14n, similarly to the first component 10A.

  In addition, a cylindrical cover member 15 is attached to the first and second components 10A and 10B by external fitting over the components 10A and 10B. The cover member 15 is formed of a non-magnetic metal plate such as stainless steel (SUS) or copper alloy that does not interfere with the magnetic field of the magnets 12n, 12s, and 14n, so that the magnets 12n, 12s, and 14n are not peeled off from the fixing surfaces. It is provided to prevent the scattering of a part of the magnets 12n, 12s, and 14n that is missing. The thickness of the cover member 15 is set to about 0.2 to 0.3 of the gap between the rotor 10 and the stator.

  Here, in the first component portion 10A having the normal structure, most of the magnetic fluxes are aligned in the radial direction in both the magnetic poles by the magnets 12n and 12s, and there are many effective magnetic fluxes that interact with the stator and contribute to rotation. Also in the second component 10B having the consequent pole type structure, since most of the magnetic flux at the magnetic poles of the magnet 14n is aligned in the radial direction, the effective magnetic flux that interacts with the stator and contributes to rotation increases. On the other hand, since the magnetic field in the core magnetic pole portion 13a is slightly weakened, the amount of effective magnetic flux aligned in the radial direction is reduced, and leakage magnetic flux that escapes in the axial direction is likely to be generated. For this reason, if the second component 10B is disposed at the axial end of the rotor 10 where leakage flux that escapes in the axial direction is likely to occur, the amount of leakage flux at the core magnetic pole portion 13a increases.

  Considering this, in the rotor 10 of the present embodiment, the first component 10A having a normal structure using magnets 12n and 12s of both magnetic poles at the axial end is divided and arranged so that the axial direction of the rotor 10 is increased. Reduction of leakage magnetic flux escaping in the axial direction at the end is achieved. Thereby, an effective magnetic flux increases and it can contribute to the high output of a motor.

Next, characteristic effects of the present embodiment will be described.
(1) In the rotor 10 of the present embodiment, the first component 10A having a normal SPM structure in which the bipolar magnets 12n and 12s are fixed to the outer peripheral surface of the rotor core 11 and the single-pole magnet 14n are the outer peripheral surface of the rotor core 13. The other pole is fixed to the outer pole of the rotor cores 11 and 13 and the magnet 12n of each of the constituent parts 10A and 10B is fixed to the outer peripheral surface of the rotor cores 11 and 13. 12s and 14n are covered with the cover member 15 to prevent scattering, and the first component 10A is divided into two parts, and each first component 10A is arranged on both axial sides of the second component 10B. . That is, the leakage magnetic flux that escapes in the axial direction is likely to be generated at the axial end portion of the rotor 10, and the magnetic field is slightly weakened at the core magnetic pole portion 13a in the continuous pole type structure. Increases leakage flux. In the present embodiment, in consideration of this, the first component 10A having the normal structure is divided and arranged on both sides in the axial direction of the second component 10B having the consequent pole type structure. Thus, most of the magnetic flux at the axial end of the rotor 10 is aligned in the radial direction, and the leakage magnetic flux escaping in the axial direction can be reduced. As a result, the effective magnetic flux increases, and the output of the motor can be increased.

  (2) In the present embodiment, the cover member 15 is configured in a cylindrical shape with a nonmagnetic metal plate so as to be attached to the target constituent portions 10A and 10B by external fitting. Accordingly, the cover member 15 can be easily configured and can be easily mounted on the rotor 10. Further, in the present embodiment, the cover member 15 is configured to be continuous beyond the constituent portions 10A and 10B, which can contribute to a reduction in the number of components.

  (3) In the present embodiment, the magnets 12n and 14n of the first and second components 10A and 10B arranged in the axial direction are configured to have the same shape in the axial direction. Thereby, if each magnet 12n and 14n is formed so that it may continue beyond each structure part 10A and 10B, it can contribute to reduction in the number of parts.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 2A to 2C, in the rotor 10x of the present embodiment, the first component 10A having a normal structure (SPM structure) is a first component having an IPM structure (embedded magnet type structure). It is replaced with 10A1.

  An annular rotor core 21 made of a magnetic metal material is used for the first component 10A1, and a pair of rotor cores 21 having a length of about 1/8 of the entire axial length of the rotor 10 is used. The two components 10B are integrally connected to both axial sides of the rotor core 13 respectively. The rotor core 21 is formed with receiving holes 21a having a substantially straight line perpendicular to the radial direction at equal angular intervals of 120 °. A rectangular plate-shaped N-pole magnet 22n is inserted and fixed in each accommodation hole 21a. The core portion on the radially outer side of each accommodation hole 21a functions as an N-pole magnet-side magnetic pole portion 21b in cooperation with the magnet 22n. Each magnet-side magnetic pole portion 21b is configured at an equal angular interval of 120 °, and is configured at an angular range of approximately 60 °.

  The core portion between the magnet side magnetic pole portions 21b is configured as a core magnetic pole portion 21c that functions as an S pole. Each core magnetic pole part 21c is configured at an equal angular interval of 120 °, and is configured in an angular range of approximately 60 °. Each accommodating hole 21a is formed larger on both sides than the magnet 22n and extends from both sides of the magnet-side magnetic pole part 21b to the vicinity of the outer peripheral edge of the rotor core 21, thereby connecting each core magnetic pole part 21c and each magnet-side magnetic pole part 21b. Magnetically separated in the circumferential direction. A total of “6” magnetic poles are formed by the magnet-side magnetic pole portion 21b having the number of magnetic poles “3” as well as the core magnetic pole portion 21c having the number of magnetic poles “3”, thereby forming a continuous pole type structure.

  In the rotor 10x of the present embodiment, since the cover member 15 is not necessary for the first component 10A1 having the IPM structure, the cover member 15 shortened according to the axial length of the second component 10B is provided. Only the second component 10B is attached by external fitting. The first component 10A1 that does not require the cover member 15 is configured to be large radially outward by the thickness of the cover member 15, and is attached to the outer peripheral surface of the first component 10A1 and the second component 10B. The member 15 is configured to be flush with the outer peripheral surface of the member 15. Incidentally, the cover member 15 is attached to the second component 10B before the first component 10A1 is connected to the second component 10B.

  Accordingly, the first end portion 10A1 of the IPM structure whose outer diameter is enlarged is divided and arranged at the end portion in the axial direction of the rotor 10x where the leakage magnetic flux that escapes in the axial direction is likely to be generated. The magnetic separation distance from the stator at the portion is reduced, and the leakage magnetic flux escaping in the axial direction is reduced. Thereby, an effective magnetic flux increases and it can contribute to the high output of a motor.

Next, characteristic effects of the present embodiment will be described.
(1) The rotor 10x of the present embodiment includes a first component 10A1 having an IPM structure in which a magnet 22n is inserted into the rotor core 21 and a second component 10B having a consequent pole type structure similar to the first embodiment. , The magnet 14n of only the second component 10B fixed to the outer peripheral surface of the rotor core 13 is covered with the cover member 15 to prevent scattering, and the first component 10A1 is divided into two parts. The component 10A1 is arranged on both sides in the axial direction of the second component 10B, and further expanded so that the outer diameter of the first component 10A1 matches the outer diameter of the cover member 15 provided in the second component 10B. It is configured. That is, as described in the first embodiment, a leakage magnetic flux that escapes in the axial direction is likely to be generated at the axial end of the rotor 10x. Therefore, in the present embodiment, this is taken into consideration and the second component of the continuous pole type structure. The first component 10A1 having the IPM structure is divided and arranged on both sides in the axial direction of 10B, and the outer diameter of the first component 10A1 that does not require the cover member 15 is enlarged to constitute the axial end portion of the rotor 10x. Thus, the magnetic separation distance from the stator becomes small, and the leakage magnetic flux escaping in the axial direction can be reduced. As a result, the effective magnetic flux increases, and the output of the motor can be increased.

  (2) Also in the present embodiment, since the cover member 15 is formed in a cylindrical shape with a nonmagnetic metal plate so that the cover member 15 is attached to the component portion 10B by external fitting, the cover member 15 can be easily configured, and the rotor 10 It becomes easy to attach to.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 3A to 3C, the rotor 10y of the present embodiment is formed by replacing the first component 10A1 of the IPM structure (embedded magnet type structure) with the first component 10A2.

  An annular rotor core 31 made of a magnetic metal material is used for the first component 10A2, and a pair of rotor cores 31 having a length of about 1/8 of the entire axial length of the rotor 10 is used. The two components 10B are integrally connected to both axial sides of the rotor core 13 respectively. The first component 10A2 uses three N-pole magnets 32n having the same shape as the magnet 14n of the second component 10B in the axial direction (may be integrated with the magnet 14n), and the rotor core 31 has a magnet 32n. The frame-like portions 31a following the outer peripheral shape are formed at equal angular intervals of 120 °, and magnets 32n are respectively inserted and fixed in the receiving holes 31b formed inside each frame-like portion 31a.

  Between the magnets 32n, core magnetic pole portions (saliency poles) 31c functioning as S poles are formed at equal angular intervals of 120 °. Each core magnetic pole part 31c has the same shape as the shape of the magnet 32n and the frame-like part 31a combined in the axial direction, and the diameter and diameter of the cover member 15 are larger than the core magnetic pole part 13a of the second component part 10B. Largely configured outward in the direction. That is, in the first component 10A2, since the cover member 15 is not necessary as in the case of the first component 10A1, the cover member 15 is attached only to the second component 10B by external fitting, and the first component 10A2 In FIG. 2, the cover member 15 is configured to have a larger diameter outward than the thickness of the cover member 15. The outer peripheral surface of the frame-like portion 31a that accommodates the magnet 32n of the first component 10A2 and the outer peripheral surface of the core magnetic pole portion 31c are flush with the outer peripheral surface of the cover member 15 that is attached to the second component 10B. It is configured. Further, between the core magnetic pole portion 31c and the frame-like portion 31a that accommodates the magnet 32n, gaps S2 that are slightly narrower than the second component portion 10B are provided in the circumferential direction. A total of “6” magnetic poles are formed of the core magnetic pole portion 31c having the number of magnetic poles “3” and the magnet 32n having the number of magnetic poles “3”, thereby forming a continuous pole type structure.

  As a result, the first end portion 10A2 of the IPM structure whose outer diameter is enlarged is divided and arranged at the end portion in the axial direction of the rotor 10y that easily generates a leakage magnetic flux that escapes in the axial direction. The magnetic separation distance from the stator at the portion is reduced, and the leakage magnetic flux escaping in the axial direction is reduced. Thereby, an effective magnetic flux increases and it can contribute to the high output of a motor.

Next, characteristic effects of the present embodiment will be described.
(1) Also in the rotor 10y of the present embodiment, the first component 10A2 having an IPM structure in which the magnet 32n is inserted into the rotor core 31 and the second component 10B having a contiguous pole structure similar to the previous embodiment, , The magnet 14n of only the second component 10B fixed to the outer peripheral surface of the rotor core 13 is covered with the cover member 15 to prevent scattering, and the first component 10A2 is divided into two parts to form the first components. The parts 10A2 are arranged on both sides in the axial direction of the second component part 10B, respectively, and further expanded so that the outer diameter of the first component part 10A2 matches the outer diameter of the cover member 15 provided in the second component part 10B. Has been. That is, as described in the previous embodiment, since the leakage magnetic flux that escapes in the axial direction is likely to be generated at the axial end portion of the rotor 10y, this embodiment takes this into consideration and the second constituent portion of the continuous pole type structure. The first component 10A2 having an IPM structure is divided and arranged on both sides in the axial direction of 10B, and the outer diameter of the first component 10A2 that does not require the cover member 15 is enlarged to constitute an axial end portion of the rotor 10y. Thus, the magnetic separation distance from the stator becomes small, and the leakage magnetic flux escaping in the axial direction can be reduced. As a result, the effective magnetic flux increases, and the output of the motor can be increased.

  (2) Also in the present embodiment, since the cover member 15 is formed in a cylindrical shape with a nonmagnetic metal plate so that the cover member 15 is attached to the component portion 10B by external fitting, the cover member 15 can be easily configured, and the rotor 10 It becomes easy to attach to.

  (3) In the present embodiment, the magnets 32n and 14n of the first and second components 10A2 and 10B arranged in the axial direction are configured to have the same shape in the axial direction. Thereby, if each magnet 32n and 14n is formed so that it may continue beyond each structure part 10A2 and 10B, it can contribute to reduction in the number of parts.

In addition, you may change embodiment of this invention as follows.
In each of the above embodiments, the first component 10A, 10A1, 10A2 to be divided is set to about 1/8 of the axial length of the rotor 10, 10x, 10y (1/4 in total), and the second component 10B However, the ratio of the first component 10A, 10A1, 10A2 and the second component 10B may be changed as appropriate.

  In each of the above embodiments, as a cover means for preventing scattering of the magnets 12n, 12s of the first component 10A, the magnet 14n of the second component 10B, etc., a cover is formed by forming a cylindrical shape with a nonmagnetic metal plate material. However, the present invention is not limited to this. For example, it is changed to a mode in which a predetermined shape is formed in advance using a resin material, or a mode in which the resin material is integrally formed with the rotor 10, 10x, 10y. May be.

In the first embodiment, the cover member 15 is configured to be continuous beyond the first and second component parts 10A and 10B. However, for example, the cover member 15 may be provided separately for each component part 10A and 10B.
The magnets 12n and 14n of the first embodiment and the magnets 32n and 14n of the third embodiment may be integrally formed.

  In the second embodiment, the first component 10A1 is configured with an IPM structure and a continuous pole type structure using a single-pole magnet 22n. However, an IPM structure using a bipolar magnet may be used.

  In each of the above embodiments, the number of magnetic poles on the rotor 10, 10x, 10y side is configured as “6”, but the number of magnetic poles may be changed as appropriate.

  10, 10x, 10y ... rotor, 10A, 10A1, 10A2 ... first component, 10B ... second component, 11, 13, 21, 31 ... rotor core, 12n, 12s, 14n, 22n, 32n ... magnet, 13a, 21c, 31c ... core magnetic pole part, 15 ... cover member (cover means), S1, S2 ... gap.

Claims (5)

A first component in which N-pole and S-pole magnets are alternately fixed to the outer circumferential surface of the rotor core in the circumferential direction;
The magnetic pole magnet on one side is fixed to the outer peripheral surface of the rotor core in the axial direction in the same direction as the first component, and the core magnetic pole portion functioning as the magnetic pole on the other side is provided on the rotor core. A second component in which magnets and core magnetic poles are alternately arranged in the circumferential direction with gaps;
Cover means for covering at least a magnet fixed to the outer peripheral surface of the rotor core;
The rotor is characterized in that the first component part is divided into two parts and arranged on both axial sides of the second component part. N-pole and S-pole magnets are alternately inserted into the rotor core in the circumferential direction, or a magnetic pole magnet on one side is inserted into the rotor core, and the rotor core has a core magnetic pole portion that functions as the magnetic pole on the other side. A provided first component;
The magnetic pole magnet on one side is fixed to the outer peripheral surface of the rotor core in the axial direction in the same direction as the first component, and the core magnetic pole portion functioning as the magnetic pole on the other side is provided on the rotor core. A second component in which magnets and core magnetic poles are alternately arranged in the circumferential direction with gaps;
Cover means for covering at least a magnet fixed to the outer peripheral surface of the rotor core;
The cover means is provided only for the second component,
The first component is divided into two parts and arranged on both sides in the axial direction of the second component, and the outer diameter of the first component coincides with the outer diameter of the cover means provided in the second component. A rotor that is configured to be enlarged. The rotor according to claim 1 or 2,
The said cover means is comprised by the nonmagnetic metal board | plate material at the cylinder shape, and is mounted | worn with the said structural part used as object by external fitting. The rotor according to any one of claims 1 to 3,
A rotor, wherein the magnets of the first and second components arranged in the axial direction have the same shape when viewed in the axial direction.   A motor comprising the rotor according to claim 1.

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