JP2008263703A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor to suppress performance deterioration while the motor is reduced in size. <P>SOLUTION: Tip faces of teeth 24 are enlarged along an axial direction of a rotation axis 30 and they are formed by inclining them against the rotation axis 30. Magnets 42 are inclined against the rotation axis 30 so as to face the tip faces inclined against the rotation axis 30. Faces of flange parts 24c of the teeth 24 and the magnets 42 are inclined against the rotary axis 30. Thus, the area of the tip faces of the teeth 24 facing the magnets 42 is secured even if an outer diameter is reduced in the axial direction of the rotation axis 30. Winding 25 is wound so as not to project with respect to the inclined tip faces of the teeth 24 in the axial direction of the rotation axis 30, so that the length of the axial direction of a coil end of the winding 25 is shortened. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor.

  Conventionally, in a brushless motor or the like, a winding is wound around a tooth of a stator core, and a tip surface of the tooth and a magnet are arranged to face each other in the radial direction (radial direction) of the rotating shaft. In such a radial gap motor, when the outer shape of the motor is made to be a flat shape shortened in the axial direction of the rotating shaft, the stack thickness of the stator core formed by stacking thin plates (thickness in the axial direction of the rotating shaft) Becomes thinner due to the coil end portion, resulting in performance degradation, for example, torque reduction.

In order to improve the torque, for example, Patent Document 1 discloses a motor in which at least a part of the opposed surfaces of the salient poles of the stator and the rotor are made non-parallel to the rotation axis. By increasing the facing area, the area where the stator and the rotor attract each other increases, so that the rotational torque can be improved.
Japanese Patent Laying-Open No. 2005-160203 (FIG. 1)

  However, when the motor described in Patent Document 1 is intended to have a flat shape with respect to the axial direction, the stator core is also thinned by the coil end portion, resulting in performance degradation. For this reason, there existed a problem that it was not able to meet the request | requirement of size reduction, maintaining performance.

  This invention is made | formed in view of such a situation, The objective is to provide the motor which can suppress a performance fall, reducing in size.

  In order to solve the above problems, the invention according to claim 1 is a stator in which a plurality of magnetic focusing portions extending along the radial direction are formed along the circumferential direction, and a winding is wound around each magnetic focusing portion; A motor having a magnet facing a tip surface of the magnetic focusing unit and fixed so as to rotate integrally with a rotation shaft, and a housing that houses the stator and the rotor. A tip surface is enlarged along the axial direction of the rotating shaft and formed to be inclined with respect to the rotating shaft, and the magnet is disposed on the rotating shaft so as to face the tip surface inclined with respect to the rotating shaft. The gist is that they are arranged to be inclined.

  According to this configuration, even if the outer diameter is reduced in the axial direction of the rotation axis by inclining the tip surface of the magnetic focusing unit and the magnet with respect to the rotation axis, the tip surface of the magnetic focusing unit and the magnet A facing area is ensured and performance degradation such as torque can be suppressed. Further, by winding the winding so that the winding does not protrude in the axial direction of the rotating shaft with respect to the tip surface of the inclined magnetic focusing portion, the axial length of the coil end of the winding is shortened, and the motor Can be reduced in size in the axial direction of the rotary shaft.

  According to a second aspect of the present invention, in the motor according to the first aspect, the winding winding portion of the magnetic focusing portion around which the winding is wound is formed so as to be inclined with respect to the rotating shaft. This is the gist. According to this configuration, by inclining the winding winding part with respect to the rotation axis, a large number of windings can be formed without increasing the winding wound around the winding winding part in the axial direction of the rotation axis. It can be wound.

  The gist of the invention described in claim 3 is that, in the motor according to claim 2, the winding is wound at an inclination with respect to the rotation shaft so as to be parallel to the magnet. . According to this configuration, the winding can be inclined with respect to the rotating shaft by winding the winding around the inclined winding portion, and the axial length of the winding can be easily shortened. can do.

  According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, the housing is formed in a bottomed cylindrical shape and has a length in the axial direction of the rotating shaft. It is formed in a flat shape that is shorter than the length in the radial direction, and the corner portion on the side opposite to the opening is formed in a tapered shape corresponding to the magnet inclined with respect to the rotation axis. To do. According to this configuration, since the corner portion of the housing is unlikely to interfere with a fan or the like fixed to the rotation shaft of the motor, it can be easily applied to an apparatus including the fan or the like.

  According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, a pair of the rotors are housed in the housing, and the pair of rotors are The magnet is fixed to the rotating shaft so that the inclination of the magnets is different from each other, and the pair of stators are housed in the housing, and the pair of stators have different inclinations of the front end surfaces of the magnetic focusing portions, and The gist is that it is fixed to the housing so as to be parallel to the magnet of the corresponding rotor.

  According to this structure, since each stator and rotor can be reduced in size in the axial direction of the rotating shaft, a motor including a plurality of pairs of stators and rotors can also be reduced in the axial direction. Further, by making the inclinations of the tip surfaces of the magnetic focusing portions of the pair of stators different from each other, the component parallel to the rotation axis of the attractive force generated between the magnetic focusing portion and the magnet depends on the inclination. Therefore, the rotation axis can be restricted from moving in the axial direction by these components. And since the pressing force which restrict | limits the movement of a rotating shaft becomes unnecessary, the resistance by the pressing force is lose | eliminated and the rotation characteristic of a rotating shaft improves.

  According to a sixth aspect of the present invention, in the motor according to any one of the first to fourth aspects, the distal end surface of the magnetic focusing portion and the magnet expand toward the proximal end side of the rotating shaft. The gist is that it is formed so as to be inclined with respect to its rotation axis.

  According to this configuration, the component parallel to the rotation axis of the attractive force generated between the magnetic focusing unit and the magnet is directed toward the base end side of the rotation shaft according to the inclination of the magnetic focusing unit and the magnet. The movement of the rotating shaft can be restricted by bringing the base end of the rotating shaft into contact with the stator.

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can suppress a performance fall, being reduced in size can be provided.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the motor housing 10 is formed in a cylindrical shape with a bottom, and is formed in a flat shape having a larger radius than the length in the central axis direction. The housing 10 is formed with a tapered corner on the side opposite to the opening of the central axis.

  The opening of the housing 10 is closed by a plate 11 formed in a circular plate shape. Then, in the inner space surrounded by the housing 10 and the plate 11, a stator 20 as a stator and a rotor fixed so as to be integrally rotatable with the rotating shaft 30 rotatably supported by the stator 20 and the housing 10. The rotor 40 is accommodated.

  A stay 21 as a fixing portion of the stator 20 is fixed to the center of the inner surface of the plate 11. The stay 21 is formed in a cylindrical shape, and a stepped portion 21c is formed by reducing the diameter of the upper portion 21a compared to the lower portion 21b. Further, a bearing portion 21 d is recessed at the center of the tip (upper end) of the stay 21. A stator core 22 is fixed to the upper portion 21 a of the stay 21. As shown in FIG. 2, the stator core 22 includes a fixed portion 23 formed in an annular shape, and a plurality of teeth 24 extending from the fixed portion 23 toward the radially outer side and arranged in the circumferential direction. . The upper portion 21a of the stay 21 is fitted into the fixed portion 23, and the fixed portion 23 is positioned by engaging the fixed portion 23 with the stepped portion 21c.

  As shown in FIG. 1, the base 24 a of the tooth 24 as a magnetic converging portion is formed to extend radially outward from the outer peripheral surface of the fixed portion 23, and from the tip of the base 24 a to the rotary shaft 30. A winding winding portion 24b that is inclined and extends outward in the radial direction. The teeth 24 are bent at the center in the radial direction as a whole by the base 24a and the winding portion 24b. A winding 25 is wound around the winding winding portion 24b.

  A flange portion 24c is formed at the radially outer end of the winding winding portion 24b. As shown in FIGS. 2 and 3, the flange portion 24 c is formed in a trapezoidal plate shape that extends from the tip of the winding winding portion 24 b to both sides in the circumferential direction and is curved along the circumferential direction. Further, the flange portion 24c is inclined with respect to the rotating shaft 30, as shown in FIG. Therefore, the outer diameter of the stator core 22 is changed (expanded) along the axial direction of the rotating shaft 30.

  Both ends in the axial direction of the flange portion 24c are processed by a plane along a line orthogonal to the rotation shaft 30. Further, the outer peripheral end (lower end) of the flange portion 24 c is chamfered in parallel with the rotation shaft 30. The lower end of the flange portion 24 c is substantially the same as the lower end of the base portion 24 a of the tooth 24 in the axial direction of the rotary shaft 30. Further, the inner peripheral end (upper end) of the flange portion 24 c is located above the upper end of the base portion 24 a of the tooth 24. Such a stator core 22 is formed, for example, by compressing and sintering magnetic powder.

  As shown in FIG. 1, the stator core 22 includes a winding portion 24b inclined with respect to the rotating shaft 30, and a flange inclined with respect to the rotating shaft 30 and inclined in the opposite direction to the winding portion 24b. A first space surrounded by the portion 24c and a plane orthogonal to the rotation shaft 30 is formed. Further, a second space surrounded by a plane passing through the upper end of the flange portion 24c and orthogonal to the rotation shaft 30 and the teeth 24 is formed. A winding 25 wound around the winding winding portion 24b is disposed in the first space and the second space. That is, in the axial direction of the rotating shaft 30, the length of the coil end of the winding 25 is substantially equal to the length of the flange portion 24c.

  As described above, the stay 21 and the housing 10 of the stator 20 support the rotating shaft 30. An annular metal bearing 12 is disposed in the center of the bottom of the housing 10, and a base end 30 a of the rotary shaft 30 inserted through the bearing 12 is inserted into a bearing portion 21 d of the stay 21. The tip of the rotating shaft 30 protrudes from the housing 10.

  A rotor 40 is fixed to the rotary shaft 30 so as to rotate integrally with the rotary shaft 30. The yoke 41 of the rotor 40 is made of a magnetic material and is formed to face the flange portion 24c. Specifically, the yoke 41 is formed in a bottomed cylindrical shape, and is formed in a flat shape having a larger radius than the length in the central axis direction. The housing 10 is formed with a tapered corner on the side opposite to the opening of the central axis. And the inclined part 41a formed in the taper shape of the yoke 41 is formed so that the flange part 24c may be opposed. Further, the open end of the yoke 41 extends in parallel with the rotary shaft 30 to form a cylindrical flange portion 24c.

  On the inner peripheral surface of the yoke 41, a magnet 42 formed in a different diameter cylindrical shape having different diameters along the axial direction of the rotary shaft 30 is fixed. The magnet 42 has a cross-sectional shape that is formed along the oblique portion 41 a and the flange portion 24 c of the yoke 41. That is, the magnet 42 has a slanted portion 42a whose diameter is increased along the axial direction of the rotating shaft 30, and a cylindrical flange portion 42b that extends from the lower end of the slanted portion 42a along the axial direction of the rotating shaft 30. It consists of and. The magnet 42 is magnetized with an N pole and an S pole along the circumferential direction of the rotating shaft 30. Such a magnet 42 is formed, for example, by injection molding by mixing magnet powder and a binder such as epoxy or nylon.

  A Hall element 50 as a magnetic detection element is fixed to the inner surface of the plate 11 so as to face the tip of the magnet 42. Based on the signal output from the Hall element 50, the supply timing of the power supplied to the winding of the stator 20 is controlled.

  In the motor configured as described above, the magnet 42 and the flange portion 24 c of the tooth 24 facing the magnet 42 are inclined with respect to the rotation shaft 30, and the magnet 42 and the flange portion 24 c are the base end of the rotation shaft 30. The diameter is expanded toward the side. For this reason, the attractive force generated between the magnet 42 and the flange portion 24 c is composed of a component that is directed radially inward of the rotary shaft 30 and a component that is parallel to the rotary shaft 30 and that is directed toward the proximal end of the rotary shaft 30. Power. With this suction force, the base end of the rotating shaft 30 is pressed against the bearing portion 21 d of the stay 21. Then, power supply to the winding 25 is controlled based on the output signal of the Hall element 50, a rotating magnetic field is generated in the stator 20, and the rotor 40 is rotated by the rotating magnetic field.

As described above, the present embodiment has the following effects.
(1) The tip surface of the tooth 24 is enlarged along the axial direction of the rotating shaft 30 and is inclined with respect to the rotating shaft 30, and the magnet 42 is opposed to the tip surface inclined with respect to the rotating shaft 30. In this manner, it is arranged so as to be inclined with respect to the rotating shaft 30. Therefore, even if the outer diameter is reduced in the axial direction of the rotating shaft 30 by inclining the surface of the flange portion 24 c of the tooth 24 and the magnet 42 with respect to the rotating shaft 30, the tip surface of the tooth 24 and the magnet 42. The opposing area is ensured, and performance degradation such as torque can be suppressed. Further, the winding 25 is wound around the inclined front end surface of the tooth 24 so as not to protrude in the axial direction of the rotary shaft 30, thereby shortening the axial length of the coil end of the winding 25. The motor can be downsized in the axial direction of the rotary shaft 30.

  (2) The winding portion 24 b of the tooth 24 around which the winding 25 is wound is formed so as to be inclined with respect to the rotating shaft 30. As a result, the winding winding part 24 b is inclined with respect to the rotating shaft 30, so that the winding 25 wound around the winding winding part 24 b does not increase in the axial direction of the rotating shaft 30. The wire can be wound.

  (3) The winding 25 was wound with an inclination with respect to the rotary shaft 30 so as to be parallel to the magnet 42. As a result, by winding the winding 25 around the inclined winding winding portion 24b, the winding 25 can be tilted with respect to the rotating shaft 30, and the length of the winding 25 in the axial direction is easy. Can be shortened.

  (4) The housing 10 is formed in a bottomed cylindrical shape and is formed in a flat shape in which the length in the axial direction of the rotary shaft 30 is shorter than the length in the radial direction, and the corner portion on the side opposite to the opening is The taper is formed in correspondence with the magnet 42 inclined with respect to the rotating shaft 30. As a result, the corner portion of the housing 10 is unlikely to interfere with a fan or the like fixed to the rotating shaft 30 of the motor, so that it can be easily applied to a device including the fan or the like.

  (5) The distal end surface of the tooth 24 and the magnet 42 are formed to be inclined with respect to the rotary shaft 30 so as to increase in diameter toward the base end side of the rotary shaft 30. As a result, the component parallel to the rotating shaft 30 of the attractive force generated between the teeth 24 and the magnet 42 is directed toward the base end side of the rotating shaft 30 according to the inclination of the teeth 24 and the magnet 42. The movement of the rotating shaft 30 can be regulated by bringing the base end of the rotating shaft 30 into contact with the stator. In addition, a spring or the like for generating a pressing force for restricting the movement of the rotating shaft 30 is unnecessary, and the number of parts can be reduced.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 4, the motor of the present embodiment is formed such that two of the motors of the first embodiment are combined by a plate 11. Since details of each part are the same as those in the first embodiment, reference numerals and descriptions are omitted.

  More specifically, the motor housing 60 is constituted by two housings 60a and 60b divided along a plane orthogonal to the rotation shaft 70, and each of the housings 60a and 60b is a housing 60 in the first embodiment. It is formed in the same way. And both the housings 60a and 60b are combined so that each other's opening end may be faced and closed. A metal bearing 61a is fixed to the center of the bottom of the housing 60a, and a metal bearing 61b is fixed to a recess formed in the center of the bottom of the housing 60b. And the rotating shaft 70 is rotatably supported by both bearings 61a and 61b.

  A plate 62 is interposed between the housings 60a and 60b. The plate 62 is formed in a thin annular shape, and its outer peripheral end is fixed to the open ends of the housings 60a and 60b. Thereby, a first accommodation space surrounded by the housing 60 a and the plate 62 and a second accommodation space surrounded by the housing 60 b and the plate 62 are formed. The first accommodation space accommodates the stator 80a and the rotor 90a, and the second accommodation space accommodates the stator 80b and the rotor 90b.

  Both the stators 80a and 80b are formed symmetrically with the plate 62 as an axis, and are formed similarly to the stator 80 of the first embodiment. The rotors 90a and 90b are formed symmetrically with the plate 62 as an axis, and are formed in the same manner as the rotor 90 of the first embodiment.

  Both stators 80 a and 80 b are arranged above and below the plate 62 and are fixed to the inner end of the plate 62. Accordingly, one stator 80 is constituted by both the stators 80a and 80b. Both rotors 90a and 90b are fixed so as to rotate integrally with the rotary shaft 70. Accordingly, one rotor 90 is constituted by both the rotors 90a and 90b.

  The winding 81a of the stator 80a and the winding 81b of the stator 80b are formed in the same manner, and the same amount of power is supplied. The attraction force generated between the stator 80a and the magnet 91a of the rotor 90a by this electric power is a force obtained by synthesizing a component toward the inner side in the radial direction of the rotating shaft 70 and a component toward the plate 62 in parallel with the rotating shaft 70. Become. Further, the attractive force generated between the stator 80b and the magnet 91b of the rotor 90b is a force obtained by synthesizing a component toward the radially inner side of the rotation shaft 70 and a component toward the plate 62 in parallel with the rotation shaft 70. . Therefore, the components that are directed toward the plates restrict the movement of the rotor 90 along the axial direction of the rotation shaft 70. Accordingly, it is not necessary to press the rotating shaft 70 along the axial direction in order to prevent the rotating shaft 70 from moving in the axial direction, and the pressing force does not hinder the rotation of the rotating shaft 70. The rotating shaft 70 rotates, that is, the rotational performance is improved.

As described above, according to this embodiment, the following effects are obtained in place of (5) of the first embodiment.
(5) A pair of rotors 90a and 90b are accommodated in the housing 60, and the pair of rotors 90a and 90b are fixed to the rotary shaft 70 so that the inclinations of the magnets 91a and 91b are different from each other. The housing 60 accommodates a pair of stators 80a and 80b, the pair of stators 80a and 80b have different inclinations of the tip surfaces of the stators 80a and 80b, and the corresponding rotor magnets 91a and 80b. It is fixed to the plate 62 so as to be parallel to 91b.

  According to this configuration, since each of the stators 80a and 80b and the rotors 90a and 90b can be reduced in size in the axial direction of the rotating shaft 70, in the motor having a plurality of pairs of stators 80a and 80b and the rotors 90a and 90b. Can also be reduced in the axial direction. Further, by making the inclinations of the tip surfaces of the pair of stators 80a and 80b different from each other, a component parallel to the rotary shaft 70 of the attractive force generated between the stators 80a and 80b and the rotors 90a and 90b is obtained. Since the directions are opposite to each other in accordance with the inclination, the movement of the rotating shaft 70 in the axial direction can be restricted by these components. And since the pressing force which restrict | limits the movement of the rotating shaft 70 becomes unnecessary, the resistance by the pressing force is lose | eliminated and the rotation characteristic of the rotating shaft 70 can be improved.

In addition, you may change embodiment of this invention as follows.
In each of the above-described embodiments, the teeth 24 are bent. However, the teeth 24 may be bent and the tip end side may be the winding winding portion 24b.

Sectional drawing of the motor of 1st Embodiment. The top view of a rotor. The perspective view of a rotor. Sectional drawing of the motor of 2nd Embodiment.

Explanation of symbols

  10, 60, 60a, 60b ... housing, 20,80,80a, 80b ... stator, 24b ... winding winding part, 25,81a, 81b ... winding, 30,70 ... rotating shaft, 30a ... base end, 40 , 90, 90a, 90b ... rotor, 42, 91a, 91b ... magnet.

Claims (6)

A stator in which a plurality of magnetic focusing portions extending along the radial direction are formed along the circumferential direction, and a winding is wound around each magnetic focusing portion;
A rotor having a magnet facing the front end surface of the magnetic focusing unit, and fixed to rotate integrally with the rotation shaft;
In a motor comprising a housing that houses the stator and the rotor,
The tip surface of the magnetic focusing part is formed with a diameter increased along the axial direction of the rotation axis and inclined with respect to the rotation axis,
The magnet is arranged to be inclined with respect to the rotation axis so as to face the tip surface inclined with respect to the rotation axis.
A motor characterized by that. The motor according to claim 1,
The motor according to claim 1, wherein the winding winding portion of the magnetic focusing portion around which the winding is wound is formed so as to be inclined with respect to the rotating shaft. The motor according to claim 2,
The motor is characterized in that the winding is wound at an inclination with respect to the rotating shaft so as to be parallel to the magnet. In the motor according to any one of claims 1 to 3,
The housing is formed in a cylindrical shape with a bottom, and is formed in a flat shape in which the length in the axial direction of the rotation shaft is shorter than the length in the radial direction. A motor having a taper shape corresponding to a magnet inclined with respect to an axis. In the motor according to any one of claims 1 to 4,
A pair of the rotors are housed in the housing, and the pair of rotors are fixed to the rotating shaft so that the inclination of the magnets is different from each other.
A pair of stators are accommodated in the housing, and the pair of stators are mounted on the housings so that the tip surfaces of the magnetic focusing portions are different from each other and parallel to the corresponding magnets of the rotor. Become fixed,
A motor characterized by that. In the motor according to any one of claims 1 to 4,
The motor according to claim 1, wherein the front end surface of the magnetic focusing portion and the magnet are formed to be inclined with respect to the rotation axis so as to increase in diameter toward the base end side of the rotation axis.

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