JPH09327151A - Motor provided with brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor, provided with a brake, in which a rotor is separated from a shaft so as to brake only the side of the shaft by a method wherein a means by which the rotor is supported by the shaft so as to be freely rotatable and by which the rotor is coupled to, and separated from, the shaft is provided and a means by which the shaft is braked is provided. SOLUTION: A moving plate 9 is urged in one direction by a spring 7, and a lining 3A is brought into contact with an edge 12 on the side of a rotor 1. Thereby, the rotor 1 is coupled to a shaft 11, and the rotor 1 and the shaft 11 are turned integrally. On the other hand, in a braking operation, an solenoid coil 4 is electrifies, a lining 3B is attracted to the side of the solenoid coil 4, and the moving plate 9 is moved to the side of the solenoid coil 4. Thereby, the lining 3A is separated from the edge 12 on the side of the rotor 1, the lining 3B is simultaneously brought into contact with an edge 13 on the side of the lining 3B, and only the side of the shaft 11 can be braked. That is to say, it can be braked by a smaller braking force.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric motor with a brake.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a structure of a main part of a conventional electric motor with a brake with a lower half omitted. As shown in the figure, a shaft 22, which is a rotating shaft, is rotatably supported on a fixed side (not shown) via a bearing 23. And
The rotor 21 is fixed to the center of the shaft 22 by a key 27, press fitting or shrink fitting, a load 25 is connected to the right side of the shaft 22 in the drawing, and the load is provided on the left side of the shaft 22 in the drawing. A brake 24 having an electromagnetic coil 26 and the like is provided.

Therefore, according to the electric motor with a brake having the above-mentioned structure, the braking force of the brake 24 causes the shaft 22,
The load 25 and the rotor 21 are braked and stopped.

[0004]

SUMMARY OF THE INVENTION As described above, the conventional
In the electric motor with a brake, the rotor 21 that is the drive source and
The shaft 27, which is the driving force transmission circuit of the
Since it is integrally fixed by the
Total GD of shaft 21, load 25 and rotor 21 ^TwoAgainst
Braking force is required. That is, the shaft 21 and the load 25
Not only the braking of the rotor 21 but also the braking of the rotor 21 is required.

Since the rotor 21 is also braked and stopped in this way, the motor itself must be started at the time of restart.

Therefore, in view of the above-mentioned conventional technique, it is an object of the present invention to provide an electric motor with a brake which can separate the rotor from the rotary shaft and brake only the rotary shaft side.

[0007]

According to a first aspect of the present invention which solves the above problems, a rotor is rotatably supported with respect to a rotary shaft, and the rotor and the rotary shaft are connected and disconnected. And a braking means for braking the rotating shaft.

In the second structure, a bearing is provided between the rotor and the rotary shaft to rotatably support the rotor with respect to the rotary shaft, and the end face on the rotor side is provided. An electromagnetic coil provided on an end surface portion of a fixed side facing each other, and an inner peripheral portion that is fitted between a spline provided on the rotary shaft and rotates with the rotary shaft, and an axis of the rotary shaft. A movable plate that is slidable in one direction, and is provided on one side of the movable plate so as to face the rotor-side end face, moves in one direction together with the movable plate, and has a large friction coefficient that contacts the rotor-side end face. It is provided on the other side of the movable plate so as to face the first lining and the end face on the fixed side, and moves in the other direction together with the movable plate by being attracted to the electromagnetic coil side to contact the end face on the fixed side. The second lining with a large friction coefficient and the movable The characterized in that said first lining and urges the one direction and a spring for pressing the end face of the rotor side.

Therefore, according to the electric motor with brake of the above-mentioned first structure, the rotor and the rotary shaft are separated by the connecting means, and the rotary shaft is braked by the braking means in this state, so that only the rotary shaft side is provided. It can be stopped by braking.

In particular, in the electric motor with a brake having the above-mentioned second structure, the rotor and the rotating shaft are connected by bringing the first lining into contact with the rotor-side end face by the spring during operation. While the rotor and the rotating shaft rotate integrally, at the time of braking, the electromagnetic coil is energized, the second lining is attracted to the electromagnetic coil side, and the movable plate is moved to the electromagnetic coil side. It is possible to separate the lining and the end surface on the rotor side, and at the same time to bring the second lining and the end surface on the fixed side into contact with each other, to brake only the rotary shaft side.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing the structure of the essential parts of an electric motor with a brake according to an embodiment of the present invention with the lower half omitted, in which (a) shows a state during operation and (b) shows. Indicates the state during braking.

As shown in the figure, a rotor 1 is provided inside a stator 2, and a rotor 1 is rotatably supported on a stationary side via a bearing 14 at the center of the rotor 1. A shaft 11, which is an axis, is provided. And rotor 1
The needle roller bearing 10 is interposed between the rotor 1 and the shaft 11 so as to be rotatably supported by the shaft 11.

A clutch brake composed of the electromagnetic coil 6 and the linings 3A and 3B is provided on the anti-load side.

More specifically, the electromagnetic coil 4 is embedded in the end face 13 on the housing 6 side facing the end face 12 on the rotor 1 side, and the disk-shaped movable plate 9 is provided between the both end faces 12 and 13. Is provided. The movable plate 9 has an inner peripheral portion fitted to the spline 8 formed on the shaft 11, whereby the movable plate 9 can rotate with the shaft 11 and slide in the axial direction of the shaft 11.

A lining 3A having a large friction coefficient is attached to one side of the movable plate 9 so as to face the end surface 12 on the rotor 1 side. This lining 3A has a movable plate 9
At the same time, it moves to one side and contacts the end face 12 on the rotor 1 side.
On the other side of the movable plate 9, a lining 3B of a cast iron material having a large friction coefficient is attached so as to face the end surface 13 on the housing 6 side. The lining 3B moves in the other direction together with the movable plate 9 by being attracted to the electromagnetic coil 6 side, and contacts the end surface 13 on the housing 6 side.

A spring 7 is attached to the shaft 11. The spring 7 biases the movable plate 9 in one direction to press the lining 3A against the end surface 12 on the rotor 1 side.

Therefore, according to the brake-equipped electric motor having the above structure, during operation, the movable plate 9 is biased in one direction by the spring 7 as shown in FIG.
By bringing A into contact with the end face 12 on the rotor 1 side,
The rotor 1 and the shaft 11 are connected so that the rotor 1 and the shaft 11 rotate integrally.

On the other hand, during braking, as shown in FIG. 1 (b), the electromagnetic coil 4 is energized to attract the lining 3B to the electromagnetic coil 4 side and move the movable plate 9 to the electromagnetic coil 4 side. 3A and the end surface 12 on the rotor 1 side can be separated, and at the same time, the lining 3B and the end surface 13 on the housing 6 side can be brought into contact with each other to brake only the shaft 11 side.

That is, as shown in FIG. 2A, in the conventional motor with a brake (see FIG. 3), the drive source (rotor 2
1) and a transmission circuit (shaft 2) for transmitting the driving force.
2) is always integrally connected, the braking capability of the braking source (brake 24) is the driving source GD ² + transmission circuit (shaft + brake lining) GD ² + load GD ²
Total GD ² but was needed for, as shown in FIG. 2 (b), the brake with motor according to the present embodiment (see FIG. 1), the drive source (rotor 1) is the driving force of the Is rotatably supported with respect to a transmission circuit (shaft 11) for transmitting the power, and the drive source and the transmission circuit are detachably connected by a clutch (clutch brake). The capacity is determined by the fact that the drive source is disconnected from the transmission circuit during braking, so that the transmission circuit GD
Only required for ² + load GD ² total GD ² . Therefore, braking can be performed with a smaller braking force than the conventional one.

In other words, between the braking time and the moment of inertia (GD ² ), there is a relationship of braking time ∝ rotation speed × inertia moment (GD ² ) / braking torque. In the conventional motor with brake, the moment of inertia (GD ² ) ≈driving source GD ² + transmission circuit G
In contrast to D ² + load GD ² , in the motor with brake according to the present embodiment, the moment of inertia (GD ² ) ≈transmission circuit GD ² + load GD
^2, and the only GD ² minutes of the driving source moment of inertia (G
D ² ) becomes smaller. Therefore, in order to secure the same braking time, the braking electric motor according to the present embodiment requires a smaller braking torque than the conventional braking electric motor.

Further, since the rotor 1 is separated from the shaft 11 and only the shaft 11 side is braked, the braking side is not affected even if the rotor 1 is kept rotating at this time. Therefore, if the operation of the electric motor is continued (that is, the rotation of the rotor 1 is continued) and only the load side (shaft 11 side) is stopped, the clutch is engaged and disengaged and the rotor 1 and The load can be started and stopped only by attaching and detaching the shaft 11, and the starting current is good only at the first starting. In particular, in the case of an electric motor with a brake to which a load with a high starting frequency is connected, the starting current is sufficient only at the first starting as described above, so the size of the electric motor can be reduced.

[0023]

As described above in detail with the embodiments of the present invention, according to the brake-equipped electric motor of the present invention, it is possible to perform braking on a load with a smaller braking force than before. In other words, a smaller braking torque than before is required to secure the same braking time. Further, if the operation of the electric motor is continued (that is, the rotation of the rotor is continued) and only the load side (rotating shaft side) is stopped, the rotor and the rotating shaft can be simply attached and detached. The load can be started and stopped and the starting current will only be good at the first start. In particular, in the case of a motor with a brake to which a load with a high start frequency is connected, the starting current is sufficient only at the first start as described above.
It is also possible to reduce the size of the electric motor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a brake-equipped electric motor according to an embodiment of the present invention with a lower half omitted.
The state during driving is shown in (b), and the state during braking is shown in (b).

FIG. 2 is an explanatory diagram showing a comparison between the essential points of the configurations of a conventional electric motor with a brake and the electric motor with a brake according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a main part of a conventional electric motor with a brake, omitting a lower half thereof.

[Explanation of symbols] 1 rotor 3A, 3B lining 4 electromagnetic coil 6 housing 7 spring 8 spline 9 movable plate 10 needle roller bearing 11 shaft 12, 13 end surface

Claims (2)

[Claims] 1. An attaching / detaching means for rotatably supporting a rotor with respect to a rotating shaft, connecting and disconnecting the rotor and the rotating shaft, and a braking means for braking the rotating shaft. An electric motor with a brake characterized by 2. An end face on a fixed side facing a rotor-side end face while rotatably supporting the rotor with respect to the rotary shaft by interposing a bearing between the rotor and the rotary shaft. And an electromagnetic coil provided on the rotary shaft, the inner peripheral portion of which is fitted to a spline provided on the rotary shaft and which rotates with the rotary shaft and is slidable in the axial direction of the rotary shaft. A movable plate and a first lining provided on one side of the movable plate so as to face the rotor-side end face and moving in one direction together with the movable plate to contact the rotor-side end face and having a large friction coefficient; A second frictional member having a large friction coefficient, which is provided on the other side of the movable plate so as to face the fixed side end face, moves in the other direction together with the movable plate by being attracted to the electromagnetic coil side, and contacts the fixed side end face. Lining and urging the movable plate in the one direction And a spring for pressing the first lining against the end face on the rotor side.