JP2012244704A - Outer-rotor motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer-rotor motor that prevents displacement of magnetic pole portions.SOLUTION: An outer-rotor motor 1 comprises: a stator 2; and an approximately annular rotor 10 that is arranged on a radially outer side of the stator 2. The rotor 10 has a second end face plate 43 that has an approximately annular shape, that is provided on a side of a second axial end of an edge 14a of a rotor cup 14, and that restricts displacement of magnetic pole portions 9 to the side of the second axial end. The second end face plate 43 has: an annular portion 43a that is mounted on an inner circumferential surface of the edge 14a and that is axially in contact with a rotor yoke 11; protrusions 43b that project radially inward from the annular portion 43a and that restrict displacement of the magnetic pole portions 9 to the side of the second axial end; and extended portions 43d that each extend from an inner circumferential surface 43c of the annular portion 43a as positioned between each circumferentially adjacent pair of the magnetic pole portions 9, to a side of a first axial end. The extended portions 43d restrict circumferential displacement of the magnetic pole portions 9 by both circumferential side surfaces 43g thereof in contact with the magnetic pole portions 9.

Description

  The present invention relates to an abduction motor.

  Conventionally, as an external rotation type electric motor, a plurality of permanent magnets are arranged on the inner peripheral surface of a rotor yoke, energized to a stator coil arranged opposite to the inner side in the radial direction of the rotor, and the rotor is driven by a rotating magnetic field generated by the coil. What was comprised so that it might rotate was known.

  For example, as shown in FIG. 14, in the abduction type electric motor 100 described in Patent Document 1, a casing 122 is fixed to a casing 121, and a sleeve 122 is inserted into the casing 121. The crankshaft 123 is coaxially disposed in the sleeve 122 with a bearing 124 and an oil seal 125 interposed between the crankshaft 123 and the sleeve 122. A rotor yoke 126 formed in a bowl shape is coaxially fastened to the end of the crankshaft 123, a magnet 128 is fixed to the inner periphery of the rotor yoke 126, and a cooling fan 129 is fixed to the rotor yoke 126. . A stator 130 is fixed to the end of the sleeve 122 with bolts 131, and a magnet 128 provided on the rotor yoke 126 coaxially fixes the stator 130 so as to form a slight air gap with the stator 130. Go.

JP 2000-175396 A

  However, in the abduction type electric motor 100 described in Patent Document 1, since the magnet 128 is only fixed to the inner periphery of the rotor yoke 126, the magnet 128 is displaced during the rotation of the rotor yoke 126 and falls off. There is a risk that.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an abduction type electric motor capable of suppressing displacement of a magnetic pole portion.

In order to achieve the above object, the invention according to claim 1
A stator (for example, a stator 2 in an embodiment described later);
A substantially annular rotor (for example, a rotor 10 in an embodiment described later) disposed on the radially outer side of the stator;
An abduction-type electric motor (for example, an abduction-type electric motor 1 in an embodiment described later),
The rotor is
A plurality of magnetic pole portions (for example, a magnetic pole portion 9 in an embodiment described later) that are magnetized in the radial direction and arranged at predetermined intervals in the circumferential direction so as to alternately reverse the magnetization direction in the circumferential direction;
It is connected to a rotating shaft (for example, a rotating shaft 13 in an embodiment described later), extends in the radial direction at one end in the axial direction, and has an annular edge (for example, in an embodiment described later) on the radially outer side of the magnetic pole portion. A rotor cup provided with an edge 14a) (for example, a rotor cup 14 in an embodiment described later);
A substantially annular rotor yoke (for example, the rotor yoke 11 in the embodiment described later) fixed to the inner peripheral surface of the edge (for example, the inner peripheral surface 14c in the embodiment described later);
A substantially annular end face plate (for example, a second end face plate 43 in an embodiment described later) provided on the other end side in the axial direction of the edge portion and restricting displacement of the magnetic pole portion toward the other end side in the axial direction; With
The end plate is
An annular part (for example, an annular part 43a in an embodiment described later) that is attached to the inner peripheral surface of the edge part and contacts the rotor yoke in the axial direction;
A convex portion that protrudes radially inward from the annular portion and restricts displacement of the magnetic pole portion toward the other axial end side (for example, a convex portion 43b in an embodiment described later);
An extending portion (for example, described later) extending from the inner circumferential surface (for example, an inner circumferential surface 43c in an embodiment described later) of the annular portion located in the circumferential direction toward one end side in the axial direction. Extending portion 43d) in the embodiment,
The extension part is characterized in that circumferential side surfaces (for example, circumferential side surfaces 43g in the embodiments described later) are in contact with the magnetic pole part to restrict displacement of the magnetic pole part in the circumferential direction. .

In addition to the structure of Claim 1, the invention according to Claim 2
The extension part is made of a nonmagnetic material.

The invention according to claim 3 includes, in addition to the configuration according to claim 1 or 2,
The end face plate is characterized in that the annular portion, the convex portion, and the extending portion are integrally formed from a nonmagnetic material.

  According to the first aspect of the present invention, the end face plate provided at the edge of the rotor cup restricts the displacement of the magnetic pole portion toward the other end in the axial direction by the convex portion, and extends in the circumferential direction of the magnetic pole portion by the extending portion. Regulate the displacement of. Thus, the displacement of the magnetic pole part can be restricted by the end face plate.

  According to the second and third aspects of the invention, since the extending part that restricts the displacement of the magnetic pole part in the circumferential direction is made of a nonmagnetic material, it is possible to reduce vortex loss in the extending part during rotor rotation. It becomes.

1 is a cross-sectional view of an abduction motor of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a fragmentary perspective view of the rotor of 1st Embodiment which concerns on this invention. It is sectional drawing of the rotor in the BB line of FIG. It is a front part of the rotor shown in FIG. FIG. 4 is a partial perspective view showing a second end face plate of the rotor shown in FIG. 3. It is a fragmentary perspective view of the rotor which concerns on a comparative example. It is sectional drawing of the rotor in the CC line of FIG. It is sectional drawing of the rotor in the DD line | wire of FIG. It is a fragmentary perspective view of the rotor which concerns on the 1st modification of this invention. It is sectional drawing of the rotor which concerns on the 2nd modification of this invention. It is sectional drawing of the rotor which concerns on the 3rd modification of this invention. It is sectional drawing of the rotor which concerns on the 4th modification of this invention. It is sectional drawing of the conventional abduction type electric motor.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

(First embodiment)
As shown in FIGS. 1 and 2, the abduction motor 1 of the present embodiment includes a stator 2 fixed to a motor housing 21 with bolts 22 around a shaft center O, and a radially outer side of the stator 2. A substantially annular rotor 10 that is disposed to face each other with a slight air gap S and is rotatable around the axis O is configured.

  The stator 2 includes a stator core 3 and a plurality of coils 4. The stator core 3 is configured by laminating a plurality of electromagnetic steel plates in the axial direction (perpendicular to the paper surface in FIG. 1), and a plurality of teeth 3b formed to project radially outward from the annular support portion 3a. Have A plurality of convex portions 3d each having a bolt hole 3c are provided inside the support portion 3a, and the stator core 3 is fixed to the motor housing 21 by bolts 22 inserted through the bolt holes 3c. The coil 4 is formed by winding the winding 6 around the teeth 3b of the stator core 3 through an insulator 7 formed of a synthetic resin having insulating characteristics.

  The rotor 10 is coupled to a plurality of magnetic pole portions 9 that are magnetized in the radial direction and alternately reverse the magnetization direction in the circumferential direction at predetermined intervals in the circumferential direction, and to the rotary shaft 13 and axially. An edged disc-shaped rotor cup 14 that extends in the radial direction at one end side (the back side in FIG. 1 and the right side in FIG. 2) and has an annular edge portion 14a on the radially outer side of the magnetic pole portion 9; A rotor yoke 11 that is fixed to the inner peripheral surface 14c of the edge 14a of the cup 14, holds the magnetic pole portion 9 from the outside in the radial direction, and is configured by laminating substantially annular electromagnetic steel plates in the axial direction. The other end in the axial direction (the front side in FIG. 1 and the left side in FIG. 2) is opened.

  The plurality of magnetic pole portions 9 are magnetized in the radial direction and are arranged at a predetermined interval in the circumferential direction so as to alternately reverse the magnetization direction in the circumferential direction, and are composed of a pair of substantially rectangular magnets 12. The pair of magnets 12 are fixed to the inner peripheral surface 11b of the rotor yoke 11 with an adhesive, for example. Specifically, in the magnetic pole portion 9a configured by fixing the pair of magnets 12 to the inner peripheral surface 11b of the rotor yoke 11, assuming that the radially outer side is the N pole, it is adjacent to the magnetic pole portion 9a via a predetermined interval. The mating magnetic pole portion 9 b is configured by fixing a pair of magnets 12 to the inner peripheral surface 11 b of the rotor yoke 11 so that the radially outer side is the S pole. In addition, the magnetic pole part 9 does not necessarily need to be comprised from a pair of magnet, and may be comprised from one magnet.

  The rotating shaft 13 is rotatably supported with respect to the motor housing 21 by ball bearings 23, and the rotor 10 is rotationally driven around the axis O by a rotating magnetic field generated by the stator 2. A resolver 24 that detects the magnetic pole position of the rotating shaft 13 is disposed between the rotating shaft 13 and the stator 2.

  The rotor cup 14 is made of a non-magnetic material, and an edge portion 14a extends from the radially outer end portion of the shaft coupling portion 14b connected to one axial end side of the rotating shaft 13 and extending in the radial direction to the other axial end side. Is formed.

  As shown in FIGS. 3 and 4, the inner peripheral surface 14 c of the edge portion 14 a of the rotor cup 14 has the first end face plate 41 and the second end plate on the one end side in the axial direction and the other end side in the axial direction across the rotor yoke 11. The end face plate 43 is fixed. The first and second end face plates 41 and 43 are made of a nonmagnetic material, and are preferably made of austenitic stainless steel such as SUS304 or SUS305.

  The first end face plate 41 is formed in a substantially annular shape, and is fixed so as to be sandwiched between one axial side surface 11 f of the rotor yoke 11 and the shaft coupling portion 14 b of the rotor cup 14. The inner peripheral surface 41a of the first end face plate 41 is smoothly connected to the inner peripheral surface 14d of the shaft coupling portion 14b to form one surface. Further, the inner peripheral surface 41a of the first end face plate 41 is formed so as to be located on the radially inner side with respect to the inner peripheral surface 11b of the rotor yoke 11, and restricts the displacement of the magnet 12 toward one end in the axial direction. .

  As shown in FIGS. 3 to 6, the second end face plate 43 is attached to the inner peripheral surface 14 c of the edge 14 a of the rotor cup 14, and substantially contacts the other axial end surface 11 g of the rotor yoke 11 in the axial direction. An annular ring part 43a, a plurality of convex parts 43b projecting inward in the radial direction from the annular part 43a and restricting the displacement of the magnet 12 toward the other axial end, and in the circumferential direction And an extended portion 43d extending from the inner peripheral surface 43c of the annular portion 43a located between the adjacent magnetic pole portions 9 toward the one end side in the axial direction, and extending between the annular portion 43a and the convex portion 43b. The protruding portion 43d is integrally formed from a nonmagnetic material.

  The extending portion 43d extends in the axial direction so that the outer peripheral surface 43e contacts the inner peripheral surface 11b of the rotor yoke 11 located between the magnetic pole portions 9 adjacent in the circumferential direction, and the inner peripheral surface 43f is inclined and formed. Is done. Further, the axial width of the extending portion 43d is formed to be smaller than the axial width of the rotor yoke 11, and the radial width is formed to become smaller toward one end side in the axial direction. The extending portion 43d is formed such that both circumferential side surfaces 43g are in contact with the magnetic pole portion 9 (magnet 12), and restricts displacement of the magnetic pole portion 9 in the circumferential direction.

  Thus, the second end face plate 43 provided on the edge portion 14a of the rotor cup 14 restricts the displacement of the magnetic pole portion 9 toward the other end side in the axial direction by the convex portion 43b, and the magnetic pole portion by the extending portion 43d. Since the displacement of the magnetic pole portion 9 in the circumferential direction is regulated, the effect of suppressing the displacement of the magnetic pole portion 9 can be enhanced as compared with the case where the magnetic pole portion 9 is simply fixed with an adhesive or the like.

(Comparative example)
Here, the rotor 10A according to the comparative example is shown in FIGS. Since the rotor 10A has the same basic configuration as the rotor 10 of the first embodiment of the present invention, the same portions are denoted by the same reference numerals, the description thereof is simplified or omitted, and only different portions are detailed. To do.

  The second end face plate 43A of the rotor 10A according to the comparative example is formed in a substantially annular shape that is substantially equal to the first end face plate 41, and the protrusion 43b and the extension provided in the rotor 10 of the first embodiment. It does not have a protruding part 43d. In addition, a plurality of step portions projecting radially inward in pairs at predetermined intervals in the circumferential direction to restrict displacement of the magnetic pole portion 9 (magnet 12) in the circumferential direction on the inner circumferential surface 11b of the rotor yoke 11 11c is formed.

  In the rotor 10A of the comparative example configured as described above, since the rotor yoke 11 is formed by laminating electromagnetic steel plates, the stage of the rotor yoke 11 that restricts the displacement of the magnetic pole portion 9 in the circumferential direction when the rotor rotates. Vortex loss may occur in the portion 11c, and the motor efficiency may deteriorate.

  On the other hand, in this embodiment, since the extension part 43d which controls the displacement to the circumferential direction of the magnetic pole part 9 consists of nonmagnetic materials, it becomes possible to reduce the vortex loss in the extension part 43d.

  As described above, according to the outer rotation type electric motor 1 of the present embodiment, the second end face plate 43 provided on the edge portion 14a of the rotor cup 14 has the axial direction of the magnetic pole portion 9 and the like by the convex portion 43b. Displacement toward the end side is restricted, and displacement of the magnetic pole part 9 in the circumferential direction is restricted by the extending part 43d. As described above, the displacement of the magnetic pole portion 9 can be restricted by the second end face plate 43.

  Furthermore, since the extending portion 43d that restricts the displacement of the magnetic pole portion 9 in the circumferential direction is made of a nonmagnetic material, it is possible to reduce vortex loss in the extending portion 43d even during rotation of the rotor.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the second end face plate 43 has the annular portion 43a, the convex portion 43b, and the extending portion 43d integrally formed from a nonmagnetic material, but is not necessarily limited thereto. It is sufficient that at least the extending portion 43d is made of a nonmagnetic material.

  Moreover, in the above-mentioned embodiment, although each convex part 43b of the 2nd end surface plate 43 was formed so that the one magnet 12 might be opposed (refer FIG. 3), it is not limited to this, As shown in FIG. 10, the pair of magnets 12 may be formed so as to face the pair of magnets 12, so that the displacement of the pair of magnets 12 toward the other end side in the axial direction may be restricted by one convex portion 43 b.

  As shown in FIG. 11, the extending portion 43 d is formed so that its axial width is substantially the same as the axial width of the rotor yoke 11, and one end in the axial direction is in contact with the first end face plate 41. May be.

  Further, as shown in FIG. 12, the extending portion 43d is formed such that its axial width is substantially the same as the axial width of the rotor yoke 11, and its inner peripheral surface 43f is horizontal to the axial direction. Also good.

  Further, as shown in FIG. 13, the extending portion 43d has an axial width substantially the same as the axial width of the rotor yoke 11, and the radial width increases toward the one end side in the axial direction. May be formed so as to be inclined.

DESCRIPTION OF SYMBOLS 1 External rotation type motor 2 Stator 9 Magnetic pole part 10 Rotor 11 Rotor yoke 12 Magnet 13 Rotating shaft 14 Rotor cup 14a Edge part 14c Inner peripheral surface 43 2nd end surface plate (end surface plate)
43a Ring part 43c Inner peripheral surface 43b Convex part 43d Extension part 43g Both sides in the circumferential direction

Claims (3)

A stator,
A substantially annular rotor disposed on the radially outer side of the stator;
An abduction motor comprising:
The rotor is
A plurality of magnetic pole portions magnetized in the radial direction and alternately arranged in the circumferential direction at predetermined intervals so as to alternately reverse the magnetization direction in the circumferential direction;
A rotor cup coupled to the rotary shaft and extending radially in the axial direction at one end, and provided with an annular edge on the radially outer side of the magnetic pole portion;
A substantially annular rotor yoke fixed to the inner peripheral surface of the edge;
A substantially annular end face plate that is provided on the other axial end side of the edge portion and restricts displacement of the magnetic pole portion toward the other axial end side;
The end plate is
An annular part attached to the inner peripheral surface of the edge part and in axial contact with the rotor yoke;
A convex portion that protrudes radially inward from the annular portion and restricts displacement of the magnetic pole portion toward the other end side in the axial direction;
An extending part extending from the inner peripheral surface of the annular part located between the magnetic pole parts adjacent in the circumferential direction toward one end side in the axial direction,
The extension part is an abduction type electric motor characterized in that both side surfaces in the circumferential direction abut against the magnetic pole part and restrict displacement of the magnetic pole part in the circumferential direction. The abduction motor according to claim 1, wherein the extension portion is made of a nonmagnetic material. 3. The abduction motor according to claim 1, wherein the end plate includes the annular portion, the convex portion, and the extending portion that are integrally formed from a nonmagnetic material.

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