JP2008182845A - motor - Google Patents

Abstract

【Task】
To provide a motor capable of further increasing the magnetic flux passing through a laminated core.
[Solution]
An armature 30 including a laminated core 20 formed by laminating a plurality of steel plates 21, and a coil 12 arranged on the laminated core 20, and arranged on the radially outer side of the armature 30 and of the armature 30 In a motor 10 including a permanent magnet 11 having a length in the rotation axis direction that is longer than a length in the rotation axis direction of a portion where the coil 12 of the laminated core 20 is disposed, a steel plate 21 constituting the lamination core 20 is The outer peripheral portions 21a of the laminated steel plates 21 are configured to be spaced apart in the rotation axis direction.
[Selection] Figure 2

Description

  The present invention relates to a motor.

A known motor is described in Patent Document 1 described later. As shown in FIG. 3, the motor includes an armature 3 including a laminated core 1 formed by laminating a plurality of steel plates and fixed to the rotating shaft 5, and a coil 2 disposed on the laminated core 1. A permanent magnet 4 which is disposed radially outward of the armature 3 and whose length in the rotation axis direction of the armature 3 is longer than the length in the rotation axis direction of the portion where the coil 2 of the laminated core 1 is disposed; It is equipped with.
JP 2003-47195 A

  In the above-mentioned thing, the height dimension (rotation-axis direction length) of the laminated core 1 of the part by which the coil 2 is arrange | positioned is smaller than the height dimension of the permanent magnet 4, and it faces the permanent magnet 4 among the laminated cores 1. The height dimension of the part (outer peripheral part) is not sufficient with respect to the height dimension of the permanent magnet 4. For this reason, the laminated core 1 cannot efficiently collect the magnetic flux of the permanent magnet 4, and there is room for improvement in increasing the magnetic flux passing through the laminated core 1 and increasing the torque of the motor.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a motor that can further increase the magnetic flux passing through the laminated core.

  In order to solve the above-described problem, the technical means taken in the present invention includes: an armature including a laminated core formed by laminating a plurality of steel plates; and a coil disposed on the laminated core; A permanent magnet disposed radially outward of the child and having a length in the rotation axis direction of the armature that is longer than a length in the rotation axis direction of the portion where the coil of the laminated core is disposed. In the motor, the steel plate constituting the laminated core is configured such that outer peripheral portions of the laminated steel plates are formed with an interval in the rotation axis direction.

 Preferably, a bent portion is provided on the outer peripheral portion of the steel plate constituting the laminated core, and the bent portion is formed such that portions corresponding to the outer peripheral portion of the steel plate are spaced apart.

  Preferably, the bent portion includes a first portion that is orthogonal to a portion of the steel plate where the coil is disposed and extends in the rotation axis direction, and is orthogonal to the first portion and radially outward of the laminated core. It is good to have the 2nd part extended.

  According to the present invention, the steel plates constituting the laminated core are formed such that the outer peripheral portions of the laminated steel plates are spaced apart from each other in the rotation axis direction. (Rotational axis direction length) becomes larger than the conventional one. Thereby, since the number of magnetic fluxes received per unit material of the laminated core increases, the magnetic flux passing through the laminated core can be further increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic sectional view of a motor 10 according to the present invention, and FIG. 2 is a diagram showing a detailed structure of a laminated core 20.

  The motor 10 includes an armature 30 including a laminated core 20 (laminated iron core) and a coil 12, and a permanent magnet 11. The laminated core 20 is formed by laminating a plurality of steel plates 21 (see FIG. 2), and is fixed to the rotating shaft 14. The coil 12 is disposed on the laminated core 20. The permanent magnet 11 is made of ferrite or the like. The permanent magnet 11 is disposed outside the armature 30 in the radial direction (the left-right direction in FIG. 1) and is fixed to the inner peripheral surface of the motor case 13. The permanent magnet 11 is formed such that the length of the armature 30 in the rotation axis direction (vertical direction shown in FIGS. 1 and 2) is longer than the length in the rotation axis direction of the portion where the coil 12 of the laminated core 20 is disposed. The rotating shaft 14 is rotatably supported by the motor case 13 via a ball bearing 15. The rotating shaft 14 rotates integrally with the laminated core 20. A commutator 16 is fixed to the rotating shaft 14. The commutator 16 is electrically connected to the coil 12 provided in the laminated core 20. The commutator 16 is electrically connected to a current supply source (not shown).

  As shown in FIG. 2, the laminated core 20 is formed by laminating a plurality of steel plates 21 (numbers are only a part). The laminated core 20 includes a laminated portion 22 and a bent portion 23. The laminated portion 22 is a portion in which the steel plates 21 are laminated without a gap in the rotation axis direction (height direction). The laminated portion 22 is provided on the inner side (left side in FIG. 2) of the laminated core 20 in the radial direction (left and right direction in FIG. 2). The coil 12 is disposed in the stacked portion 22. The dimension in the height direction of the laminated portion 22 is smaller than the dimension in the height direction of the permanent magnet 11. The bent portion 23 is provided on the outer side of the laminated core 20 in the radial direction (the right side in FIG. 2). The bent portion 23 is provided on the outer peripheral portion 21 a (the number is only a part) of the steel plate 21 constituting the laminated core 20. The bent portion 23 is bent so as to be separated in the rotation axis direction of the armature 30. The bent portion 23 is orthogonal to the portion of the steel plate 21 where the coil 12 is disposed and extends in the rotation axis direction, and the bent portion 23 is orthogonal to the first portion 23a and is perpendicular to the first portion 23a. And a second portion 23b (numbered only partially) extending radially outward (rightward in FIG. 2). That is, the steel plates 21 constituting the laminated core 20 are formed such that the outer peripheral portions 21a of the laminated steel plates 21 are spaced apart in the rotation axis direction.

  In an Example, the outer peripheral part 21a of the rotation axis direction center part of the steel plate 21 which comprises the lamination | stacking core 20 is not spaced apart (it does not have the bending part 23), and the steel plate 21 outside the rotation axis direction center part The outer peripheral portions 21a are separated from each other. Specifically, it is preferable that the outer peripheral portions 21a of four or more steel plates 21 arranged on the outer side in the rotation axis direction constituting the laminated core 20 are formed so as to be spaced apart.

  Moreover, as the bending part 23, the space | interval of the outer peripheral parts 21a of the steel plate 21 may be spaced apart by curving the outer peripheral part 21a of the steel plate 21 in the rotation axis direction of the armature 30.

  In the motor 10 of the present invention, the steel plate 21 constituting the laminated core 20 is formed so that the outer peripheral portions 21a of the laminated steel plates 21 are spaced apart from each other in the rotation axis direction. The height dimension (length in the rotation axis direction) of the laminated core 20 becomes larger than that of the conventional one. Thereby, since the number of magnetic fluxes received per unit material of the laminated core 20 increases, the magnetic flux passing through the laminated core 20 can be further increased.

  As a result, it is possible to realize a motor that can obtain a larger torque with the same size as the conventional one (motor torque increase) and a motor that can obtain a torque equivalent to the conventional one with a smaller size than the conventional one. (Motor size reduction and weight reduction).

1 is a schematic cross-sectional view of a motor 10 according to the present invention. The figure which shows the detailed structure of the laminated core 20. FIG. The figure which shows a well-known motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor 11 Permanent magnet 12 Coil 20 Laminated core 21 Steel plate 21a Outer peripheral part 23 Bending part 23a 1st part 23b 2nd part 30 Armature

Claims (3)

An armature including a laminated core formed by laminating a plurality of steel plates, and a coil disposed in the laminated core;
A permanent magnet disposed radially outward of the armature and having a length in the rotational axis direction of the armature that is longer than the length in the rotational axis direction of the portion of the laminated core where the coil is disposed; In a motor comprising:
The motor comprising the steel plates constituting the laminated core, wherein outer peripheral portions of the laminated steel plates are formed at intervals in the rotation axis direction. The bent portion is provided in the outer peripheral portion of the steel plate constituting the laminated core, and the bent portion is formed with portions corresponding to the outer peripheral portion of the steel plate spaced apart from each other. The motor described.   The bent portion includes a first portion that is orthogonal to a portion of the steel plate where the coil is disposed and extends in the rotation axis direction, and a second portion that is orthogonal to the first portion and extends radially outward of the laminated core. The motor according to claim 2, further comprising:

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