JPS62152359A - Flat motor - Google Patents

Abstract

PURPOSE:To eliminate leakage flux from a front bracket to a rear bracket, by a method wherein the rear bracket is formed out of a non-magnetic substance wherein a permanent magnet is fixed at one end, and wherein the other end is provided with a plate made of a magnetic substance fixed firmly on the rear bracket. CONSTITUTION:A rear bracket 8 is formed out of a non-magnetic substance. At one end of a plate 19 made of a magnetic substance, a permanent magnet 11 is fixed, and the other end is firmly fixed at the rear bracket 8. Magnetic flux coming from the N pole of the permanent magnet 11 passes through an armature 2 to a front bracket 5, and passes through the armature 2 again to enter the S pole of the permanent magnet 11, and passes through the flux coming from the N pole of the permanent magnet 11 passes through the armature 2 and the front bracket the 5 without the leakage to the rear bracket 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat motor suitable for use in OA and other equipment such as a copy i.

[Conventional technology]

A conventional flat motor of this type is an O servo mode as shown in FIG. In the same figure, (1) is a rotating shaft, and (2) is an armature that is fitted and fixed to this rotating shaft (1), and has a built-in coil (3), and is electrically coupled to this coil (3). It has a commutator (4). One end of the rotating shaft (1) is supported by a bearing (7) arranged in a bearing holder (6) of a front bracket (5) made of a magnetic material, and the other end of the rotating shaft (1) is made of a magnetic material. A bearing (10) is mounted on a bearing holder (9) of a rear bracket (8) consisting of a bearing (10).A ring-shaped permanent magnet αυ is fixed to the armature (2) side of the rear bracket (8). The space created by this permanent magnet αB and the front bracket (5) is
2) It rotates together with the rotating shaft (1). 3 is a brush, which is pressed against the commutator (4) by a spring σ3. α4) is a brush holder for holding the brush (2) and is fixed to the rear bracket (8) by the base (to). The part is the cover.

When voltage is applied to the commutator (4) of the flat motor configured as above through the brush surface, the coil (1)
A current flows through, and due to this current and the magnetic flux of the permanent magnet αD,
Rotational force is generated in the armature (2), and this armature (2)
) rotates together with the rotating shaft (1).

[Problem that the invention seeks to solve]

However, in the flat motor as described above, the magnetic flux leaves the N pole of the permanent magnet αD, passes through the armature (2), returns to the front bracket (5), passes through the armature (2) again, and enters the S pole of the permanent magnet αD. into the rear bracket (
9) that draws a closed loop through the permanent magnet 0
There is one that exits the ON pole, passes through the armature, enters the front bracket (5), further passes through the rear bracket (8), and enters the S pole of the permanent magnet αD, forming a closed loop. In the latter case, when the magnetic flux leaks through the front bracket (5) to the rear bracket (8), the armature (
There is a problem in that the force contributing to the rotation (2) decreases, deteriorating the performance of the flat motor.

The present invention was made to solve this problem, and aims to prevent the performance from deteriorating by eliminating the magnetic flux leaking from the front bracket to the rear bracket.

[Means for solving problems]

The flat motor according to the present invention has a rear bracket made of a non-magnetic material, a permanent magnet fixed to one end, and a plate made of a magnetic material fixed to the rear bracket at the other end.

[Effect]

In the present invention, since the rear bracket is made of a non-magnetic material, magnetic flux does not leak from the front bracket to the rear bracket, and leakage magnetic flux that does not contribute to rotational force is eliminated, thereby preventing performance deterioration of the flat motor. .

〔Example〕

The first factor is a cross-sectional view showing an embodiment of the present invention.

In the figure, except for (81sαD and α9), it is exactly the same as the conventional 7-rat motor. (8) is a rear bracket made of non-magnetic material, and α9 has a permanent magnet 0 fixed to one end. The other end is a plate fixed to the rear bracket (8).

In such a structure, the magnetic flux emitted from the N pole of the permanent magnet passes through the armature (2) and connects to the front bracket (
To 5), pass through the armature (2) again and enter S with permanent magnet 0.
The magnetic flux enters the pole, passes through plate α9, and draws a closed loop <0. Therefore, the magnetic flux coming out from the N pole of the permanent magnet circle is an armature (2
) and pass through the front bracket (5"l) to the rear bracket (8). Furthermore, if the rear bracket (8) is made of an insulating material, the wear caused by the wear of the brush surface. Even if powder accumulates between the brush υ and the rear bracket (8), the brush (
2) The current passes through this wear powder to the rear bracket (8).
There will be no leakage to.

〔Effect of the invention〕

As explained above, according to the present invention, leakage of magnetic flux to the rear bracket is prevented by forming the rear bracket from a non-magnetic material and fixing a permanent magnet to the rear bracket via a magnetic plate. It has the effect of preventing

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional flat motor. In the figure, C1) is the rotation axis, (2) is the armature, (
3) is a coil, (5) is a front bracket, (8) is a beam bracket), 1111 is a permanent magnet, and (to) is a plate. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) An armature with a built-in coil, a shaft fitted and fixed to this armature, a front bracket that supports this shaft and is made of a magnetic material and a rear bracket that is made of a non-magnetic material, and a A flat motor comprising: a permanent magnet that generates magnetic flux in the axial direction; and a plate made of a magnetic material, the permanent magnet being fixed to one end and the other end being fixed to the rear bracket. (2) The flat motor according to claim 1, wherein the rear bracket is made of an insulating material.