JPS6216772Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat motor suitable for use, for example, in a reel motor of a large tape recorder.

Recently, in this type of large tape recorder, the rotating shaft of a motor is directly connected to the reel shaft, and the reel shaft is directly driven to rotate. This is suitable for controlling the rotation of the reel motor and applying servo to the tape tension, for example.

In that case, the reel motor as described above needs to be installed in a narrow space between the chassis and the panel, and needs to be able to generate a large rotational torque. Therefore, as this type of reel motor, a flat motor in which the rotor diameter is larger than the bearing span is generally used.

However, in the above-described tape recorder, when the reel is attached, a force in the lateral direction (bending direction) is likely to be applied to the reel shaft. In this case, since the flat motor has a short bearing span, it cannot sufficiently absorb the bending force, and force is applied to the attachment portion between the bearing and the stator board, which may cause deformation or damage.

In view of these points, the present invention eliminates the above-mentioned drawbacks with a simple configuration. An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a stator substrate, and a stator coil 2 is provided on this substrate 1. Reference numeral 3 denotes a rotor, and a rotor magnet 4 is provided at a portion of the rotor 3 that faces the coil 2.

Reference numeral 5 denotes a rotating shaft, which is connected to the rotor 3 and directly connected to the reel stand 6. Note that 7 is a reel and 8 is a tape. Also, 9 is a panel, 10
indicates sashimi.

Further, reference numeral 11 denotes a bearing, and the rotating shaft 5 has its end abutted against a thrust bearing 12 and is supported by radial bearings 13 and 14. In addition, in the flat motor, the bearing 13,
14 is short, so if a force is applied in the bending direction as shown by arrow a when the reel is attached, the force cannot be sufficiently absorbed.

Therefore, a damper material 16 is provided between the nut 15 and the substrate 1 when the bearing 11 is attached to the substrate 1. Further, the peripheral edge 3a of the rotor 3 is extended toward the substrate 1, and the peripheral edge 3a of the rotor 3 and the substrate 1 are
Reduce the distance between

Therefore, in this flat motor, even if a bending force is applied to the rotating shaft 5 and the bearing 11 when the reel 7 is attached, this force is absorbed by the damper material 16, and if the reel 7 is bent beyond a predetermined level, the peripheral edge of the rotor 3 3a contacts the substrate 1 and prevents it from being bent any further.

This is how a flat motor is constructed, and according to the present invention, even if a force in a bending direction is applied to the rotating shaft, there is no risk that the attachment portion between the bearing and the board will be deformed or damaged.

In addition to absorbing the force in the bending direction described above, the damper material 16 also has the effect of damping vibrations during normal use.

[Brief explanation of the drawing]

The figure is a configuration diagram of an example of the present invention. 1 is a stator board, 3 is a rotor, 5 is a rotating shaft,
11 is a bearing, and 16 is a damper material.

Claims (1)

[Scope of utility model registration request] The rotor diameter is larger than the bearing span, and
In a flat motor in which the bearing is vertically mounted on a stator board, a damper that can be deformed in response to bending stress to the bearing is provided at the attachment portion of the bearing and the stator board, and
A flat motor characterized in that a peripheral edge of the rotor is extended toward the stator substrate, and a distance between the peripheral edge of the rotor and the stator substrate is reduced.