JPH1169724A - Device for mounting of encoder onto motor shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device in which a center deviation is not generated between an encoder and a motor shaft, by a method wherein a connecting hole is recessed and formed in the encoder and an encoder main shaft which is installed so as to protrude from a braking-gap adjusting plate is fitted to, inserted into, and connected directly to, the connecting hole. SOLUTION: An input shaft 11 which is fitted to, inserted into, and connected directly to, connecting hole 10 which is recessed and formed in a rotary encoder E is installed coaxially with a motor shaft D in a boss part at a braking-gap adjusting plate 4. Then, the input shaft 11 is connected directly to the encoder E by a locking pin 12 in the radial direction. An encoder-mounting leaf spring 13 is attached to an encoder holding plate E' by a bolt B3, and the mounting leaf spring 13 is fixed to a motor case. Thereby, the distance between the encoder E and the motor shaft D is shortened, and the encoder E can be built in a fan cover in which a braking-plate cooling fan is housed. The encodr part E does not protrude form the fan cover, it is hardly subjected to the influence of an external force, and there is no fear that a center deviation due to an external force is generated between the motor shaft D and the encoder E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor having an encoder mounted thereon.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a device for mounting an encoder on a motor has a brake plate 1 fixed to a shaft end of a motor shaft D of a motor M with a key or the like so as to be detachable. A braking operation plate 2 is disposed so as to face the braking member 1 ′, and the braking operation plate 2 is excited by an electromagnet 3 attached to the motor M side by a bolt B 1, against the extension biasing force of the spring S. Separated from member 1 '(moved to the right in FIG. 3)
To release the braking, and the demagnetization of the electromagnet 3 causes the spring S
The urging force of (1) presses the braking operation plate 2 against the braking member 1 'to generate a braking force.

The boss 4A of the braking gap adjusting plate 4 attached to the braking plate 1 with bolts B2 is provided with a threaded hole for screwing the shaft end D 'of the motor shaft D. '
By rotating the screw hole in the screwing or unscrewing direction, the brake plate 1 is adjusted and moved in the axial direction, and the braking gap with the brake operating plate 2 is adjusted to increase or decrease the braking action force. Adjust.

A connecting shaft 4B projecting from the boss 4A of the braking gap adjusting plate 4 coaxially with the motor shaft D is connected to a connecting member 5A.
Is connected to the input shaft 6 of the encoder E, and an output cable C is attached to the encoder E.

[0005]

In the above prior art, the connecting member 5 is connected to the input shaft 6 protruding from the encoder E and the connecting shaft 4B protruding from the boss of the braking gap adjusting plate 4. As a result, the mounting length of the brake plate 1 and the encoder E in the axial direction increases, and the encoder cover 8 further protrudes in the axial direction from the fan cover 7 of the cooling fan F mounted on the brake plate 1. Had to be mounted.

[0006] However, if the encoder cover 8 is protruded in the axial direction, the encoder cover 8 is lifted up in the work of transporting and adjusting the motor, and an external force is likely to be applied. Misalignment between the motor E and the motor shaft D is likely to occur, and the output accuracy of the encoder E is reduced.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a brake gap adjusting plate fixed to a boss portion of a brake plate externally fixed to an end of a motor shaft, and the brake gap adjusting plate is coaxial with the motor shaft. This problem has been solved by projecting an encoder input shaft, fitting the encoder input shaft directly into a connection hole recessed in the encoder, and attaching a detent member to the encoder holding plate.

[0008]

The connecting hole is formed in the encoder, and the encoder input shaft protruding from the braking gap adjusting plate is directly inserted into the connecting hole, so that the axial mounting length between the braking plate and the encoder is smaller than before. The encoder can be stored in the cooling fan cover of the brake plate.

[0009]

FIG. 1 is a front view of a cross section of a main part of the present invention, FIG. 2 is a side view of a part of FIG. 1, and the same symbols as those in FIG.

The boss 4A of the braking gap adjusting plate 4 has
An input shaft 11 that is fitted and directly connected to a connection hole 10 formed in the rotary encoder E and protrudes coaxially with the motor shaft D. The input shaft 11 is directly connected to the encoder by a stop screw 12 in a radial direction. As shown in FIG. 2, an encoder mounting plate spring 13 is mounted on the encoder holding plate E 'with bolts B3, and the mounting plate spring 13 is fixed to the motor case.

Accordingly, the encoder holding plate E 'is prevented from rotating by the mounting plate spring 13, and the number of rotations of the motor shaft D is counted by the rotary encoder.
To output a pulse signal. Further, the coil spring 13 interposed between the ball bearing of the motor shaft D and the end surface of the brake plate boss portion is used to drive the brake plate 1 when the inverter is driven at a low frequency.
This is to prevent vibration.

[0012]

According to the present invention, the input shaft connecting hole is formed in the encoder, and the input shaft projecting coaxially with the motor shaft is directly inserted and connected to the brake gap adjusting plate mounted on the brake plate. The distance between the motor shaft and the motor shaft has been shortened, and the encoder can be built into the fan cover that houses the cooling fan for the brake plate. Therefore, there is no possibility of misalignment due to external force between the motor shaft and the encoder shaft, and a motor directly connected to the encoder can be obtained without impairing the normal operation of the encoder.

[Brief description of the drawings]

FIG. 1 is a front view of a cross section of a main part of the present invention.

FIG. 2 is a partial side view of FIG.

FIG. 3 is a front view showing a cross section of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Braking plate 4 Braking gap adjustment plate 7 Cooling fan cover 10 Encoder input shaft connection hole 11 Encoder input shaft 13 Detent member

Claims (1)

[Claims] 1. A brake gap adjusting plate is fixed to a boss portion of a brake plate externally fitted and fixed to an end of a motor shaft, and an encoder input shaft coaxial with the motor shaft is projected from the brake gap adjusting plate. An encoder mounting device in which an input shaft is directly fitted and inserted into an input shaft connecting hole recessed in an encoder, and a rotation preventing member is mounted on an encoder holding plate.