JP2011125170A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an motor which effectively reduces the radial vibrations of an armature including the resonance of an armature coil and an insulator. <P>SOLUTION: The motor 10 is equipped with: a rotating shaft 1; a field magnet 2 fixed to the rotating shaft 1; and an armature 3 having a plurality of magnet poles 30 counter to the field magnet 2. Each magnet pole 30 has a core 32 extending in the direction of the radius of the rotating shaft 1 and an armature coil 36 wound around the core 32 via an insulator 14. A coil winding portion 18 of the insulator 14 is provided with a vibration-absorbing portion 20 that absorbs the radial vibrations of the core 32. The vibration-absorbing portion 20 may have a slit to be formed inside the coil winding portion 18 of the insulator 14 or to make the coil winding portion 18 of the insulator 14 out of a rubber elastic material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly to a radial gap type electric motor characterized by the structure of an insulator.

  Conventionally, a radial gap type electric motor is known. Such an electric motor is used in, for example, a compressor of an air conditioner.

  FIG. 9 is a sectional view showing a conventional radial gap type motor. As shown in FIG. 9, the electric motor 90 includes a rotating shaft 1, a field element 2, and an armature 3. The rotating shaft 1 is fixed to the field element 2, and both ends are pivotally supported by a bearing (not shown) fixed to the armature 3. The field element 2 is formed in a cylindrical shape by alternately arranging permanent magnets having different polarities. The armature 3 has a plurality of magnetic pole portions 30 facing the field element 2. Each magnetic pole portion 30 includes a core portion 32 extending in the radial direction of the rotary shaft 1 and an armature winding 36 wound around the core portion 32 via a winding winding portion 38 of the insulator 34. ing.

  In the electric motor 90, the field element 2 rotates about the axis C of the rotary shaft 1 as a central axis by changing the polarity of the magnetic field generated at each magnetic pole portion 30 provided in the armature 3. The polarity of the magnetic field is controlled by the current flowing through the armature winding 36. The driving force due to this rotation is transmitted to another mechanism (not shown) via the rotating shaft 1.

  The insulator 34 is provided to insulate the core portion 32 from the armature winding 36. The insulator 34 is disposed so as to sandwich each core portion 32 from both sides in the axial direction so that each winding portion 38 faces each core portion 32. Further, the insulator 34 is fixed to each core portion 32 by strongly winding the armature winding 36 around the winding winding portion 38.

  In general, the electromagnetic excitation force generated by the operation of the electric motor 90 mainly acts strongly on the armature 3 in the radial direction, and particularly strongly on the core portion 32. This electromagnetic excitation force generates vibration in the core portion 32. This vibration is transmitted to the armature winding 36 via the insulator 34.

  As described above, the armature 3 has high rigidity in the radial direction because each core portion 32 is strongly fixed to the insulator 34 by the armature winding 36. For this reason, the armature 3 is easily affected by the electromagnetic excitation force. The vibration of the core portion 32 causes resonance with the insulator 34 and the armature winding 36 and greatly vibrates the armature 3.

  Further, the vibration of the armature 3 is a direct factor that reduces the energy conversion efficiency for converting the electric energy applied to the electric motor 90 into the driving force, and thus greatly affects the performance of the electric motor 90.

  An electric motor in which such vibration is reduced is disclosed in the following patent document. In the electric motor described in Patent Document 1, a gap is provided between the stator core teeth (core portion 32 in the conventional example of FIG. 9) and the insulator, and this gap causes a vibration absorption effect. Thereby, the vibration of the stator (armature 3 in the conventional example of FIG. 9) is reduced.

  However, in the electric motor described in Patent Document 1, although the electromagnetic excitation force works most strongly in the radial direction of the stator core, the vibration absorption effect for the radial vibration is as much as the vibration absorption effect for the axial and rotational vibrations. I can't hope.

  In addition, since the electric motor described in Patent Document 1 contacts the inner corner portion of the insulator and the corner portion of the tooth and firmly fixes them, the rigidity of the insulator in the axial direction and the rotational direction is reduced. However, the rigidity in the radial direction is not reduced.

  Therefore, in the electric motor described in Patent Document 1, it is difficult to effectively reduce radial vibration of the stator core and resonance with the insulator and the like.

JP 2001-231207 A

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electric motor capable of effectively reducing vibration in the radial direction of the armature including resonance with the insulator and the armature winding. It is to provide.

  An electric motor according to the present invention includes a rotating shaft, a field element fixed to the rotating shaft, and an armature having a plurality of magnetic pole portions facing the field element, and each magnetic pole portion is in the radial direction of the rotating shaft. And an armature winding wound around the core portion via a winding winding portion of the insulator, the winding portion of the insulator having a core portion It is characterized by comprising a vibration absorbing portion that absorbs vibrations in the radial direction.

  The vibration absorbing portion is formed by forming a slit inside the winding winding portion of the insulator.

  A plurality of the slits are formed side by side in the axial direction.

  The slit penetrates in the circumferential direction of the rotating shaft or in the radial direction of the rotating shaft.

  In the vibration absorbing portion, the winding winding portion of the insulator may be formed of a rubber elastic material.

  According to the electric motor of the present invention, since the vibration absorbing portion provided in the winding portion of the insulator effectively absorbs vibration in the radial direction of the core portion, it includes resonance with the insulator and the armature winding. The vibration in the radial direction of the armature can be effectively reduced. Thereby, the energy conversion efficiency of an electric motor improves and the performance of an electric motor can be improved.

  If a slit is formed inside the winding portion of the insulator as the vibration absorber, the secondary moment of inertia in the radial direction of the insulator is reduced and the rigidity of the insulator in the radial direction is reduced, so the insulator is easily deformed. Become. The vibration in the radial direction of the core portion is absorbed by the deformation of the insulator. Thereby, the vibration of the armature in the radial direction can be reduced.

  If a plurality of slits are formed side by side in the axial direction, the rigidity of the insulator in the radial direction can be further reduced, and the above effect can be further enhanced.

  If the slit is penetrated in the circumferential direction of the rotating shaft or in the radial direction of the rotating shaft, the elasticity of the winding portion of the insulator is improved, so that it is possible to further enhance the vibration absorbing effect on the radial vibration of the armature.

  Furthermore, the same effect as described above can be obtained when the winding portion of the insulator is formed of a rubber elastic material as the vibration absorbing portion.

It is a perspective view which shows the electric motor which concerns on this embodiment. It is sectional drawing of the electric motor which concerns on this embodiment along the AA line shown in FIG. It is a perspective view which shows the armature which concerns on this embodiment. It is a perspective view which shows the core part which concerns on this embodiment. It is a top perspective view showing the insulator concerning this embodiment. It is a bottom perspective view showing the insulator concerning this embodiment. It is sectional drawing along the BB line shown in FIG. 5, Comprising: (a) is an expanded sectional view of the insulator which concerns on this embodiment, (b) is an insulator expanded sectional view which concerns on other embodiment. It is a conceptual diagram which shows the force which acts on the armature which concerns on this embodiment. It is sectional drawing which shows the conventional electric motor.

  Hereinafter, embodiments of an electric motor according to the present invention will be described with reference to the drawings. In the present specification, the same reference numerals indicate the same or similar functions and functions. In this specification, “axial direction” and “circumferential direction” are directions indicated by arrows in FIG. 1, and “radial direction” is perpendicular to an axial direction including the direction indicated by arrows in FIG. Meaning any direction.

  As shown in FIG. 1, the electric motor 10 according to the present embodiment is a radial gap type electric motor. The electric motor 10 includes a rotating shaft 1. The rotating shaft 1 is fixed to the field element 2. The field element 2 is formed in a cylindrical shape, and includes a field portion (not shown) on the side peripheral surface. The field element 2 is disposed at the center of the armature 3. The armature 3 has a plurality of magnetic pole portions 30 (see FIG. 2), and each magnetic pole portion 30 faces the field portion of the field element 2. In FIG. 1, the armature winding 36 (see FIG. 2) is not shown. The electric motor 10 generates a magnetic field whose polarity changes at each magnetic pole portion 30 provided in the armature 3 to rotate the field element 2 about the axis C of the rotary shaft 1 as a central axis. Thereby, driving force is obtained.

  As shown in FIG. 2, the magnetic pole portion 30 has a constant width in the circumferential direction (see FIG. 1), a core portion 32 extending in the radial direction, and an armature winding 36 through which a current for generating a magnetic field flows. And the insulator 14 interposed between the core portion 32 and the armature winding 36 to electrically insulate them. The insulator 14 is fixed to the core portion 32 by strongly winding the armature winding 36 around the core portion 32 via the winding winding portion 18 of the insulator 14. A vibration absorbing portion 20 is provided inside the winding winding portion 18 of the insulator 14. The vibration absorber 20 will be described in detail later.

  The rotating shaft 1 is a power transmission member formed in a rod shape. The rotating shaft 1 is fixed to the field element 2, and both ends of the rotating shaft 1 are pivotally supported by a bearing (not shown) fixed to the armature 3. The axis C of the rotating shaft 1 is located on the center of gravity of the electric motor 10. The diameter and length of the rotating shaft 1 are appropriately designed according to the shape and size of the electric motor 10. Examples of the material of the rotating shaft 1 include metals such as iron, but are not particularly limited.

  The field element 2 is a rotor that rotates about the axis C of the rotating shaft 1 as a central axis. The field element 2 is formed in a columnar shape, and the central axis of the column coincides with the axis C. Field portions (not shown) having different polarities are alternately arranged on the side peripheral surface of the field element 2, and the field portions are opposed to the magnetic pole portions 30 provided in the armature 3.

  The shape of the field element 2 is not particularly limited as long as the field portion is configured to face the magnetic pole portions 30. For example, a plate shape, a curved plate shape, or a combination thereof may be used.

  The size of the field element 2 is appropriately designed depending on the size of the electric motor 10 and the like, but it is preferable that the facing area between the field portion and each magnetic pole portion 30 is wide.

  The material used for the field element 2 is preferably a permanent magnet made of a hard magnetic material such as an alnico magnet or a ferrite magnet, but is not limited thereto. An electromagnet can be used for the field element 2.

  The armature 3 is a stator that is fixed to a case (not shown). As shown in FIG. 3, the armature 3 includes a stator core 35, a plurality of insulators 14, and an armature winding 36 (see FIG. 2, which is omitted in FIG. 3).

  The armature 3 is arranged such that a plurality of insulators 14 sandwich the stator core 35 from both sides in the axial direction. At this time, each core portion 32 of the stator core 35 and each winding portion 18 of the insulator 14 face each other. Further, the insulator 14 is fixed to the core portion 32 of the stator core 35 by strongly winding the armature winding 36 around the winding winding portion 18. The core portion 32 wound with the armature winding 36 via the winding winding portion 18 of the insulator 14 constitutes the magnetic pole portion 30.

  The stator core 35 is a core material that constitutes the armature 3. As shown in FIG. 4, the stator core 35 has a plurality of core portions 32 extending between the inner peripheral portion 31 and the outer peripheral portion 33 extending in the radial direction. A part of both end faces located in the axial direction of the core portion 32 is in contact with the winding winding portion 18 of the insulator 14. In the stator core 35 according to this embodiment, the core portions 32 are provided at six locations, but the number of the core portions 32 provided is arbitrary.

  The shape of the stator core 35 is as follows. The inner peripheral portion 31 is formed in a substantially cylindrical shape by intermittently arranging curved plate-like members, and the outer peripheral portion 33 is formed in a cylindrical shape having a larger radial thickness than the curved plate-like member of the inner peripheral portion 31. Yes. The core portion 32 is formed in a substantially rectangular parallelepiped shape, and one end side in the radial direction is connected to the curved plate-like member of the inner peripheral portion 31 and the other end side is connected to the outer peripheral portion 33. Further, the inner circumferential portion 31, the core portion 32, and the outer circumferential portion 33 are formed to have the same axial height.

  The size of the stator core 35 is not particularly limited because it is appropriately designed according to the size of the electric motor 10 and the like. Further, the size of the core portion 32 affects the strength of the magnetic field (magnetic force) generated by the magnetic pole portion 30, and therefore, the design may be changed as necessary.

  As the material of the stator core 35, it is preferable to use a metal, and it is particularly preferable to use a ferromagnetic material such as iron or nickel.

  The insulator 14 is an electrically insulating member provided to insulate the core portion 32 and the armature winding 36. As shown in FIG. 5, in the insulator 14, a plurality of winding winding portions 18 disposed so as to correspond to the positions of the respective core portions 32 are provided between the inner peripheral member 141 and the outer peripheral member 143. Yes. Accordingly, the same number of winding winding portions 18 as the core portions 32 are provided.

  The shape of the insulator 14 is as follows. Like the inner peripheral portion 31 of the stator core 35 described above, the inner peripheral member 141 is formed in a substantially cylindrical shape in which curved plate-like members are intermittently arranged, and the planar shape thereof is the same as that of the inner peripheral portion 31. It is the same as the planar shape.

  The outer peripheral member 143 has a cylindrical shape having a diameter larger than that of the inner peripheral member 141 and the same thickness in the radial direction, and a notch having the same width as the circumferential width of the winding portion 18 is axial. Is formed. The lower end surface of the notch portion is continuous with one surface of the winding winding portion 18.

  The winding winding part 18 is a plate-like member having a certain thickness and having an opening recess 181 (see FIG. 6) formed on one surface. The winding winding part 18 is connected to the inner peripheral member 141 on one end side in the radial direction and to the outer peripheral member 143 on the other end side. The surface on which the opening recess 181 is formed is opposed to a surface continuous with the lower end surface of the notch. The opening edge surface of the surface where the opening recess 181 is formed is continuous on the same plane as the one end surfaces of the inner peripheral member 141 and the outer peripheral member 143. At this time, the other end surfaces of the inner peripheral member 141 and the outer peripheral member 143 are disposed on the same side with respect to the continuous plane.

  The opening recess 181 is provided to reduce the contact area between the winding portion 18 and the core portion 32. The opening recess 181 is formed by forming a step portion in the axial direction from the opening edge surface of the winding winding portion 18. Therefore, the cross section along the radial direction and the circumferential direction of the winding winding part 18 is concave.

  The winding winding portion 18 has an opening edge surface in contact with the core portion 32, and the opening recessed portion 181 does not contact the core portion 32. Opening recess 181 is closed by the contact surface of core portion 32, and a gap is formed between winding winding portion 18 and core portion 32. This gap produces a vibration absorbing effect, so that the axial vibration of the core portion 32 is reduced.

  Further, as shown in FIG. 7A, a vibration absorbing portion 20 is provided inside the winding winding portion 18. The vibration absorbing unit 20 includes a plurality of slits 19 formed side by side in the axial direction. The slit 19 is formed in the radial direction, the circumferential direction, or both. The slit 19 has the same shape in plan view as that of the opening recess 181. There are no particular restrictions on the width and number of the slits 19. For example, only one slit wider than the slit 19 of this embodiment may be provided, or many slits (for example, five or more) narrower than the slit 19 of this embodiment may be provided.

  The size of the insulator 14 is appropriately designed according to the size of the stator core 35. However, the circumferential width of the winding portion 18 must be formed wider than the circumferential width of the core portion 32. This is because a gap is formed in the circumferential direction when the armature winding 36 is wound around the core portion 32 to insulate the core portion 32 and the armature winding 36 from each other.

  As a material of the insulator 14, an electrically insulating material is preferably used. Examples thereof include, but are not limited to, an electrically insulating resin such as a polycarbonate resin and an epoxy resin.

  The armature winding 36 is a conducting wire through which a current for generating a magnetic field in the magnetic pole portion 30 flows. The armature winding 36 has an insulating coating (not shown) on its surface. Both ends of the armature winding 36 are connected to a control circuit terminal (not shown). The number of turns of the armature winding 36 and the like are appropriately adjusted so that a desired magnetic field is generated.

  Next, the effect | action of the electric motor 10 which concerns on this embodiment is demonstrated using FIG. For convenience of explanation, a part of the display of the armature winding 36 is omitted. When the electric motor 10 operates, the electromagnetic excitation force F works in the radial direction of the core portion 32. Due to the influence of the electromagnetic excitation force F, vibration in the radial direction occurs in the core portion 32. The radial vibration generated in the core portion 32 is transmitted to the insulator 14.

  The insulator 14 is fixed with the winding portion 18 in contact with the core portion 32. For this reason, the radial force f from the core portion 32 acts on the winding portion 18 of the insulator 14 due to the influence of the radial vibration transmitted to the insulator 14. The insulator 14 also vibrates in the radial direction due to the influence of the radial force f from the core portion 32.

  Here, in the electric motor 10, the vibration absorbing portion 20 including a plurality of slits 19 formed side by side in the axial direction is provided inside the winding winding portion 18 of the insulator 14, so that the cross section of the insulator 14 in the radial direction is provided. The second moment is reduced. Thereby, the rigidity with respect to the radial direction of the insulator 14 is reduced, and the insulator 14 (particularly, the winding portion 18) is easily deformed. Therefore, the insulator 14 is deformed by the radial force f from the core portion 32.

  Since a part of the radial force f from the core portion 32 works as a force for deforming the insulator 14, the force that causes the radial vibration of the insulator 14 is reduced. That is, the deformation of the insulator 14 reduces the radial vibration generated in the insulator 14. In other words, the vibration in the radial direction generated in the core portion 32 is absorbed by the vibration absorbing portion 20.

  The armature winding 36 is wound in contact with the winding winding portion 18 of the insulator 14. For this reason, the radial force f ′ from the winding portion 18 acts on the armature winding 36 due to the influence of the radial vibration of the insulator 14. Due to the influence of the radial force f 'from the winding part 18, radial vibrations also occur in the armature winding 36.

  However, since radial vibration generated in the insulator 14 is absorbed by the vibration absorbing portion 20, the radial force f 'from the winding portion 18 is very small. Therefore, the radial vibration generated by the armature winding 36 is very small. For example, if the armature winding 36 is wound so as to be displaceable in the radial direction, this vibration can be absorbed.

  In the conventional electric motor 90, since the core portion 32 is firmly fixed to the insulator 34 and the armature winding 36, the rigidity of the armature 3 in the radial direction is strong. For this reason, resonance was caused, and as a result, the armature 3 vibrated greatly. However, since the electric motor 10 according to the present embodiment has a reduced rigidity in the radial direction of the insulator 14, resonance hardly occurs.

  According to the electric motor 10 according to the present embodiment, since the vibration absorbing portion 20 is provided inside the winding winding portion 18 of the insulator 14, the vibration in the radial direction of the core portion 32 can be absorbed. Therefore, the radial vibration of the armature 3 including the resonance with the insulator 14 and the armature winding 36 can be effectively reduced. Thereby, the energy conversion efficiency of the electric motor 10 can be improved, and the performance of the electric motor 10 can be improved.

  In addition, according to the electric motor 10 according to the present embodiment, a plurality of slits 19 formed in the axial direction as the vibration absorbing portion 20 are provided inside the winding portion 18 of the insulator 14, whereby the radius of the insulator 14 is increased. The rigidity with respect to the direction can be reduced. Thereby, the vibration of the armature 3 in the radial direction can be reduced more effectively.

  As mentioned above, although the electric motor 10 which concerns on this embodiment was demonstrated, the electric motor which concerns on this invention can be implemented with another form.

  For example, an embodiment may be provided that includes a vibration absorbing portion that penetrates the slit 19 formed in the winding winding portion 18 shown in FIG. 7A in the circumferential direction, or FIG. 7B. As shown, an embodiment may be provided that includes a vibration absorbing portion 20a in which a slit 19a formed in the winding winding portion 18 is penetrated in the radial direction. According to the electric motor of such an embodiment, since the elasticity of the winding portion of the insulator is improved, the vibration absorbing effect of the vibration absorbing portion with respect to the vibration in the radial direction of the armature can be further enhanced.

  Further, an embodiment in which a plurality of slits are arranged in the radial direction may be used. In such an embodiment, the slit may penetrate in the axial direction. Even in the electric motor of such an embodiment, since the rigidity of the insulator in the radial direction can be reduced, the same effect as described above can be obtained.

  Or the embodiment which formed the coil | winding winding part of the insulator with the rubber elastic material as a vibration absorption part may be sufficient. In the electric motor 10 and the like according to the above-described embodiment, the rigidity of the insulator 14 in the radial direction is reduced by the structure of the insulator 14 (particularly, the internal structure of the winding portion 18). On the other hand, if the winding portion of the insulator is formed of a rubber elastic material as the vibration absorbing portion, the rigidity of the insulator in the radial direction can be reduced due to the material characteristics of the winding portion. Also with the electric motor of this embodiment, as described above, the vibration in the radial direction of the armature can be effectively reduced.

  Furthermore, a sponge-like material having a plurality of holes can be used instead of the rubber elastic material.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces.

1: Rotating shaft 2: Field element 3: Armature 10, 90: Electric motor 14, 34: Insulator 18, 38: Winding winding part 19, 19a: Slit 20, 20a: Vibration absorbing part 30: Magnetic pole part 32: Core Part 36: Armature winding

Claims (5)

A rotating shaft, a field element fixed to the rotating shaft, and an armature having a plurality of magnetic pole portions facing the field element, wherein each magnetic pole portion extends in a radial direction of the rotating shaft. And an armature winding wound around the core portion via a winding winding portion of the insulator,
An electric motor comprising a vibration absorbing portion that absorbs vibration in a radial direction of the core portion at a winding portion of the insulator.   The electric motor according to claim 1, wherein the vibration absorbing portion is formed by forming a slit inside a winding winding portion of the insulator.   The electric motor according to claim 2, wherein a plurality of the slits are formed side by side in the axial direction.   The electric motor according to claim 2 or 3, wherein the slit penetrates in a circumferential direction of the rotating shaft or a radial direction of the rotating shaft. The electric motor according to claim 1, wherein the vibration absorbing portion is formed by forming a winding winding portion of the insulator with a rubber elastic material.

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