JP2002345180A - Stator for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for motor which is effective for reduction of manufacturing cost. SOLUTION: Each of magnets 20, 21, allocated symmetrically for a shaft in the external circumferential side of an armature, is formed into a shape to form a cylindrical recessed surface to the front surface of a rectangular parallelopiped, having the front surface directed to the axial center of armature. A plate-like yoke member 22 is provided adjacent to one end of magnet 20 and one end of magnet 21, while a plate-like yoke member 23 is also provided adjacent to the other end of magnet 20 and the other end of magnet 21. A stator 17 is held in the radial direction and axial direction by a housing 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator installed inside a housing, and more particularly to a motor stator including a magnet and a yoke member.

[0002]

2. Description of the Related Art In this type of conventional motor stator, a yoke member is generally formed in a cylindrical shape having a circular or oval cross section, and also serves as a case. The magnet is formed in an arc-shaped cross section, arranged in the yoke member, and fixed to the case with an adhesive or a spring.

[0003]

SUMMARY OF THE INVENTION A cylindrical yoke member comprises:
Generally, it is manufactured by subjecting an iron plate to deep drawing or cutting a steel pipe, and belongs to an expensive component among electric motor components.

Although it is effective to form the yoke member into a cylindrical shape and also serve as a case in order to make the motor versatile, in a motor installed inside a housing, the yoke member is not necessarily a cylinder. You don't need to be.

An object of the invention of this application is to provide a motor stator which is effective when the yoke member is not required to be cylindrical and which is effective in reducing the manufacturing cost.

[0006]

According to the invention of this application, in a motor stator installed inside a housing, each of a first and a second magnet arranged axially symmetrically on the outer peripheral side of the armature is provided. A rectangular parallelepiped having a front surface facing the axis of the armature, the front surface of which has a cylindrical concave surface, and one end of the first magnet and one end of the second magnet One yoke member is adjacent to the other end of the first magnet and the other end of the second magnet is adjacent to a second yoke member in the form of a plate. It is a stator for an electric motor characterized by being held.

Although this motor stator has two yoke members, each yoke member is plate-shaped, so that the manufacturing cost of the yoke member is lower than the manufacturing cost of one cylindrical yoke member. Significantly reduced.

In the above stator for an electric motor, each of the first and second yoke members is provided with at least one pair of a first pair of locking portions disposed adjacent to opposing surfaces of the first and second magnets. By providing them, the interval between the two magnets may be maintained. Further, each of the first and second yoke members has a second pair of locking portions disposed adjacent to both side surfaces of the first magnet and the second yoke member.
The first magnet, the second magnet, the first yoke member, and the second yoke member are relatively positioned by providing a third pair of locking portions disposed adjacent to both side surfaces of the first magnet. It is good also as making it do.

[0009]

FIG. 1 is a sectional view showing an electric motor portion of an electric actuator according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. In FIG. 3, the winding coils of the armature are not shown.

1 to 3, reference numeral 10 denotes a housing molded using a resin material, which is fixed to an actuator housing (not shown). An electric motor 11 and a worm 12 are installed in the housing 10. The motor 11 includes a rotating shaft 15 supported by the housing 10 via bearings 13 and 14, an armature 16 coupled to the rotating shaft 15, a stator 17 surrounding the outer periphery of the armature 16, and fixed to the rotating shaft 15. Flat commutator 18 and brush 19 attached to housing 10
Are the main components. The worm 12 is located between the bearings 13 and 14 and is connected to the rotating shaft 15.

The stator 17 of the electric motor 11 includes a pair of magnets (permanent magnets) 20, 21 and a pair of yoke members 22,
23. The magnets 20 and 21 are connected to the armature 16
Are arranged axially symmetrically on the outer peripheral side of the, and have the same shape. FIG. 4 is a front view of the magnet 20, and FIG.
Is a left side view of the magnet 20, and FIG. 6 is a bottom view of the magnet 20. The magnet 20 has a cylindrical concave surface 20 on the front surface of a rectangular parallelepiped having an armature 16 with a front surface 20a facing the axis.
b. Yoke member 22,
Reference numeral 23 denotes a plate-like member. The yoke member 22 is adjacent to one ends of the magnets 20 and 21, and the yoke member 23 is adjacent to the other ends of the magnets 20 and 21.

As shown in FIGS. 1 to 3, the yoke member 22 has two first pairs of locking portions 22 a adjacent to the front faces of the magnets 20 and 21, and the yoke member 22 has two side surfaces of the magnet 20. Adjacent second pair of locking portions 22b
And a third pair of locking portions 22c adjacent to both side surfaces of the magnet 21. The yoke member 23 includes the yoke member 2
2, two pairs of a first pair of locking portions 23 a adjacent to the facing front of the magnets 20 and 21 are provided, and a pair of second locking portions 2 adjacent to both side surfaces of the magnet 20 are provided.
3b and a third pair of locking portions 23c adjacent to both side surfaces of the magnet 21. The gap between the magnets 20 and 21 is maintained by the locking portions 22a and 23a. Locking part 22
b, 22c, 23b, 23c, the magnets 20, 21 and the yoke members 22, 23 in the axial direction of the armature 16.
Relative movement is restricted.

The housing 10 has a concave portion 10a in which the yoke member 23 fits, and has a side wall 10b that comes into contact with the back surfaces of the magnets 20, 21. When the housing 10 in which the electric motor 11 is assembled is fixed to the actuator housing, the stator 17 is sandwiched between the housing 10 and the actuator housing. Thus, when the housing 10 is fixed to the actuator housing, the stator 17 is held in the radial direction and the axial direction by the housing 10 and the actuator housing.

The magnets 2 are attached to the yoke members 22 and 23.
An additional portion adjacent to the back surface of 0 or 21 may be provided.

[0015]

As described above, according to the invention of this application, the manufacturing cost of the yoke member can be reduced, and the motor can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electric motor portion of an electric actuator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

4 is a front view of the magnet 20. FIG.

5 is a right side view of the magnet 20. FIG.

6 is a bottom view of the magnet 20. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Electric motor 12 ... Warm 15 ... Rotating shaft 16 ... Armature 17 ... Stator 20, 21 ... Magnet 22, 23 ... Yoke member

Claims (1)

[Claims] 1. A stator of an electric motor installed inside a housing, wherein each of first and second magnets arranged axially symmetrically on the outer peripheral side of the armature has a front face facing an axis of the armature. And a plate-shaped first yoke member is adjacent to one end of the first magnet and one end of the second magnet. The other end of the magnet and the second
A plate-shaped second yoke member is adjacent to the other end of the magnet, and is held in the radial direction and the axial direction by the housing.