JPH0312049Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a flat motor suitable for fan motors for general industrial use, electrical equipment, etc.

Configuration and Problems of Conventional Example As shown in FIGS. 1 and 2, this type of conventional motor has a flat armature 1 having a commutator, which is connected to one side of the plane of the flat armature 1 through a gap in the thrust direction. A bracket 4 having a bearing 3 is disposed for the permanent magnet 2, and a yoke 5 for receiving the magnetic flux of the permanent magnet 2 is disposed on the other side, and the yoke 5 is provided with springs at opposing positions at 180 degree intervals in the inner diameter direction. Two brush holders 7 are arranged to hold the brushes 6 to be energized, and
A housing 8 having a bearing 9 and covering this brush holder 7 is fixed. The armature shaft 10 is rotatably supported by the bearings 3 and 9.

According to the above configuration, the brush 6 is
Since the brush holders 7 protruded from the tips of the brush holders 7 arranged at 180 degree intervals, the commutator could not be inserted and assembly was difficult.

In addition, the armature 1 due to the misalignment of the concentricity with the bearing 3
Since the bearings 3 and 9 may fall down and come into contact with the permanent magnet 2 or the yoke 5, it is necessary to ensure the concentricity of the bearings 3 and 9, which requires high costs to improve the machining accuracy and assembly accuracy of these parts. It was becoming.

Furthermore, since the bearing 9 is located near the brush, wear powder from the brush 6 may cause the bearing 9 to lock, abnormal noises, etc.
There was a problem in that the inner diameter of the yoke was not fixed, so it vibrated slightly.

Purpose of the invention This invention fundamentally solves the above-mentioned problems.The bearing that supports the armature shaft of the flat armature is provided only on the bracket side, and the shaft is supported on one side, thereby reducing the fall of the armature. At the same time, two brush retainers are formed integrally with a resin-molded cover at positions where the commutator on the opposite side of the bearing faces, and the angles of these two brush retainers are arranged at 60 degrees or 90 degrees. By making it easier to assemble, and by separating the brush and bearing, a high-quality and inexpensive flat motor is provided.

Structure of the invention The invention consists of a bracket with a permanent magnet and a cantilever-supported bearing fixed to both sides of a flat armature on one side facing the plane of the armature through an axial gap, and on the other side. A yoke that receives the magnetic flux generated by the permanent magnet is disposed on the side thereof, and a brush cover formed by molding an insulating material is fixed to this yoke.

Inside this cover, a hole into which a commutator is inserted and two brush storage areas that hold brushes are integrally formed at an angle of 60 degrees and 90 degrees, and these two
A bulge is formed by expanding the hole into which the commutator is inserted by the required amount on the side facing the brush accommodating portion on the equal dividing line of the angle formed by the brush accommodating portion.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that the same components as those in the above conventional example will be described using the same numbers.

In the figure, reference numeral 1 denotes an armature, in which a plurality of flat coils are connected to a commutator 11, aligned, and covered with resin molding, and integrated with an armature shaft 10 that transmits rotational force. is fixed. A bracket 4 to which a permanent magnet 2 is fixed via an air gap is disposed on the side opposite to the commutator side of the armature 1, and the armature shaft 10 is supported on a cantilever by this bracket 4. A metal bearing 12 is fixed thereto. On the other hand, on the opposite flat plate surface where the commutator 11 is located, a yoke 5 is disposed facing the permanent magnet 2 with a gap interposed therebetween.

A cover 14 made of molded synthetic resin is fixed to the yoke 5, and a hole 15 and a hole 60 into which the commutator 11 is inserted are fixed to the cover 14.
The commutator 1 is placed on the side opposite to the brush storage portions 13 on the equal dividing line of the angle formed by the two brush storage portions 13 arranged at an interval of 2 degrees.
A bulge 15a is formed by expanding the hole 15 into which the holder 1 is inserted by a required amount.

When assembling the above configuration, the gap adjustment washer 1 is attached to the bearing 12 fixed to the bracket 4.
After inserting the armature 1 through the armature 6 and fixing the yoke 5 to the bracket 4, the brush cover 14 is eccentrically inserted so that the commutator 11 of the armature 1 is located in the bulge 15a of the brush cover 14. After that, the cover 14 is moved toward the center, and the tip of the brush 6 is pressed by the outer periphery of the commutator 11 and pushed into the brush storage part 13, thereby fixing the bracket 5 at a predetermined position on the cover 14. I can do it.
Thereby, even if the brush 6 protrudes from the tip of the brush storage part 13, assembly can be easily performed. Furthermore, since the inner end surface of the cover 14 comes into contact with the center of the yoke 5, subtle vibrations of the yoke 5 can be prevented.

In addition, in the description of this embodiment, the brush storage section 13 is referred to as
Although they are arranged at intervals of 60 degrees, this is determined by the direction in which the commutator 11 presses the brush 6 and the electrical design, and it is most desirable to set them at 60 degrees or 90 degrees.

Effects of the invention As described above, in the present invention, since the armature has a cantilevered structure, it is easy to prevent the armature from tilting, and there is little influence from the machining accuracy of the parts. Further, by forming a bulge in the commutator insertion hole of the cover, assembly of the motor can be facilitated. Further, it is possible to provide an inexpensive and highly reliable flat motor that can prevent subtle vibrations of the yoke and eliminate the influence of carbon powder on the bearing portion.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional flat motor, Figure 2 is a sectional view of a conventional flat motor.
3 is a partially cutaway view of the flat motor of the present invention, and FIG. 4 is a plan view of the cover of the motor. 1... Armature, 2... Permanent magnet, 4... Bracket, 5... Yoke, 6... Brush, 10... Armature shaft, 11... Commutator, 12... Bearing, 13...
...brush storage section, 14...cover, 15a...bulge, 15...hole.

Claims (1)

[Scope of utility model registration request] It consists of a flat armature with a commutator, a bracket with a permanent magnet and a bearing, a yoke fixed to this bracket, and a brush cover made of an insulating material fixed to this yoke. A hole is formed inside into which the commutator is inserted, and the two brush housings are rotated at 90 degrees or
The commutator is placed at positions separated by an angle of 60 degrees, and the hole into which the commutator is inserted is expanded by the required amount on the side facing the brush storage part on the equal dividing line of the angle formed by these two brush storage parts. A flat motor.