JP2799284B2 - Stepping motor support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting structure for a stepping motor, and more particularly to a supporting structure for a stepping motor in which vibration during driving is reduced.

[0002]

2. Description of the Related Art A stepping motor can obtain a rotation amount proportional to the number of pulses by applying a rectangular pulse current, and can be controlled with high accuracy by an open loop. Used.

[0003]

However, due to the characteristics of the motor, the stepping motor rotates while repeatedly starting and stopping every pulse. Therefore, at the time of low-speed driving, the motor itself becomes a vibration source by repeatedly starting and stopping, causing noise and inducing vibration of the equipment. Such vibrations become more remarkable as the weight of the supporting structure of the stepping motor decreases and the rigidity thereof decreases, which is a major problem in reducing the size and weight of the device. Furthermore, when the stepping motor is driven at a low speed, vibrations actually remain at the start / stop of each pulse, and the remaining vibrations hinder smooth driving and quiet operation.

The present invention has been made in view of the above circumstances, and provides a simple and lightweight stepping motor support structure capable of suppressing motor vibration.

[0005]

The present invention SUMMARY OF] is secured to motor support plate counter-output shaft side of the stepping motor, the bullet
One end of the support rod capable of being displaced is fixed to the motor support plate and the other end is fixed to the stepping motor support, and the output shaft of the stepping motor is rotatably supported by the stepping motor support. Is what you do.

[0006]

The spring system absorbs and releases the rotational reaction force when the stepping motor is started and stopped for each pulse, so that the rotational displacement for each pulse is smooth and vibration is suppressed.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, 1 is a stepping motor,
Reference numeral 2 denotes a motor bracket fixed to the base of the device, and reference numeral 3 denotes a motor support plate.

The motor support plate 3 is fixed to the end face of the main body of the stepping motor 1 on the side opposite to the output shaft with bolts 4. One end of a support rod 5 is fixed to four corners of the motor support plate 3, and the other end of the support rod 5 is fixed to the motor bracket 2.
Thereby, the stepping motor 1 is supported on the motor bracket 2. An output shaft 6 of the stepping motor 1 is penetrated through the motor bracket 2, a pinion gear 7 is fitted to a tip of the output shaft 6, and a bearing 8 is fitted to a penetrating portion of the output shaft 6.

The main body of the stepping motor 1 is supported by the motor bracket 2 via the motor support plate 3 and the support rod 5 and the output shaft 6
Are rotatably supported by the motor bracket 2.

The support rod 5 is made of an elastic material such as steel, and has a flexibility to bend appropriately in response to a reaction force when the stepping motor 1 starts and stops.
The diameter and rod length are determined. Further, the support rod 5 is provided symmetrically with respect to the axis of the stepping motor 1, so that a reaction force at the time of starting and stopping causes bending in the rotation direction with respect to the axis of the stepping motor 1. I have. As described above, since the output shaft 6 is supported by the motor bracket 2 via the bearing 8, even if the support rod 5 is bent, the radial displacement of the output shaft 6, that is, the pinion gear 7, does not occur. .

Although not shown, the pinion gear 7
Is engaged with a driven gear.

Next, the operation of this embodiment will be described.

FIG. 3A shows the rotational displacement of the output shaft 6 itself when a rectangular pulse drive current is applied to the stepping motor 1. FIG. 3B shows the apparent rotational displacement of the output shaft 6, that is, the rotational displacement of the output shaft 6 based on the motor bracket 2.

As described above, the support rod 5 responds to the reaction force when the stepping motor 1 starts and stops at every one pulse, and has flexibility enough to flex appropriately. In the drawing, a delay indicated by X occurs with respect to the rotational displacement of the output shaft 6 itself, resulting in a smooth rise, and when the stepping motor 1 stops, the output shaft 6
After the rotation of the support rod 5 itself, rotation by the deflection Y of the support rod 5 is added, so that a smooth stop is achieved. Thus,
Vibration at the time of starting and stopping is suppressed.

When the stepping motor 1 is driven at a low speed, the phenomenon of starting and stopping becomes remarkable. Actually, minute vibrations accompanying the starting and stopping remain, but the support rod 5 absorbs such minute residual vibrations. Thus, a smooth operation of the stepping motor 1 is realized.

The supporting structure is a stepping motor 1
It is a vibration system using itself as a mass and the support rod 5 as a spring. The spring constant is changed by appropriately selecting the cross-sectional area, length, or material of the support rod 5, and the required start / stop smoothness is achieved. Obtainable.

Further, the stepping motor 1 only needs to be elastically supported in the rotation direction about the axis. For example, the stepping motor 1 has a structure in which the main body of the stepping motor 1 is rotatably supported on a base or the like and a spring is provided between the main body base. There may be. Further, the stepping motor 1 is fixed to the supporting portion of the stepping motor via the motor bracket 2, but the motor bracket 2 may be omitted and the stepping motor 1 may be directly mounted on a base or the like.

[0019]

As described above, according to the present invention, a simple and lightweight structure is achieved, and an excellent effect that a smooth and quiet drive of the stepping motor is realized is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a diagram showing an actual rotational displacement and an apparent rotational displacement of a stepping motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stepping motor 2 Motor bracket 3 Motor support plate 4 Bolt 5 Support rod 6 Output shaft 7 Pinion gear 8 Bearing

Claims (1)

(57) [Claims] 1. A stepping motor, wherein a motor support plate is fixed to an opposite output shaft side of a stepping motor, one end of an elastically displaceable support rod is fixed to the motor support plate, and the other end is fixed to a stepping motor support portion. Wherein said output shaft is rotatably supported by said stepping motor support.