JPS6037334B2 - Electromagnetic induction coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic induction coupling device having a clutch function and a brake function, and more particularly to one that independently obtains the generated starting and braking torques and increases the heat capacity.

In general, electromagnetic induction clutches such as eddy current clutches and induction clutches are widely used for speed control, but because they are clutches, they cannot provide braking torque, so they cannot be used when the load is negative torque or when the load is stopped quickly. If you want to stop it, you will need to use the brakes as well.

In order to solve the above-mentioned disadvantages, the present invention provides an electromagnetic coupling type bag counterfeit having a clutch function and a brake function in a single device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a current type clutch and brake unit, which is an embodiment of the present invention, will be described in detail with reference to the drawings.

In the figure, 1 is a drive shaft, 2 is a first rotating body fixed to this drive shaft 1, and this first rotating body 2 has magnetic poles 2a and 2b.
and an excitation coil 3 held within the magnetic poles 2a and 2b. 4 is the driving shaft, 5 is this driven wheel 4
This second rotating body 5 is a connecting body of the first and second bodies, and the other magnetic bodies 6 and 7,
It is composed of a non-magnetic material 8 which holds these magnetic materials 6 and 7 fixedly at a distance.

Reference numeral 9 denotes a stator fixed to a fixed portion (not shown), and this stator 9 is composed of magnetic poles 9a, 9b and an excitation coil 10 held within the magnetic poles 9a, gb.

Next, the operation of the embodiment will be explained.

While the drive shaft 1 is being rotated by the electric motor,
First, when obtaining the clutch function to start the load, if the exciting coil 3 is excited by a DC power source, a magnetic flux a is generated as shown by the dotted line, so that each magnetic pole 2a of the first rotating body 2
, 2b receive this magnetic flux (1a) and form different poles, and at the same time, one magnetic body 6 of the second rotating body 5 receives an alternating magnetic field via this different pole and generates an eddy current.

The second rotary body 5 is rotated in the rotational direction of the first rotary body 2 by the magnetic field based on this eddy current and the attraction torque of the different polarities, so that the driven shaft 4 is rotationally driven and the load is Driven. That is, the first rotating body 2 and the second rotating body 5 operate as an eddy current type clutch by exciting the excitation coil 3. Next, when obtaining the brake function of braking the load that is being rotated, firstly, the excitation of the excitation coil 3 is cut off, and then the excitation coil 10 is energized. As shown by the dotted line, a magnetic flux b is generated, so the fixation is performed. Since the magnetic poles 9a and 9b of the child 9 receive this magnetic flux (b) and form different poles, the other magnetic body 7 of the second rotating body 5 receives the alternating magnetic field and generates an eddy current.

A braking force acts on the second rotating body 5 due to the magnetic field based on this eddy current and the attraction torque of the different polarities. That is, the stator 9 and the second rotating body 5 operate as an eddy current type flake. By the way, in the conventional device, the magnetic bodies 6 and 7 on one side and the other side are not magnetically isolated, that is, a single magnetic body is used for both clutch and brake functions. The magnetic flux ■ from each exciting coil 3, 10 is applied to each magnetic pole 2a, 2 of the first rotor 2 or stator 9.
b, 9a, 9b, brake torque is generated when the clutch is functioning, and clutch torque is generated when the brake is functioning. Therefore, the clutch and brake torques cancel each other out, causing the clutch and Not only will the brake torque drop, making it impossible to obtain effective torque, but since the clutch and brake functions operate at the same time, there will be heat loss in connection parts that are not originally required, and the heat loss of the entire device will be extremely high. It had fatal drawbacks such as increased size.

Therefore, in the embodiment of the present invention, the second rotor 5 is formed into an annular shape, while the other magnetic bodies 6 and 7 are annularly shaped non-magnetic bodies 8, and the non-magnetic bodies are formed on the inner and outer peripheries of the annular non-magnetic body 8, respectively. Since they are fixed by a distance separated by 8 and magnetically blocked, the above-mentioned drawbacks can be reliably eliminated.

In other words, the excitation magnetic flux of the excitation coil 3 during the clutch function ■
a passes through only one magnetic body 6 and is blocked by the non-magnetic body 8, so that there is no leakage to each magnetic pole 9a, 9b of the stator 9 via the other magnetic body 7, and when the one-way brake function is applied. The excitation magnetic flux b of the excitation coil 10 flows only through the other magnetic body 7, and is shielded by the non-magnetic body 8 as described above, so it passes through the one magnetic body 6 to the first rotating body 2.
This prevents leakage to the respective magnetic poles 2a and 2b.
Note that the present invention is not limited to the embodiments, and various modifications can be made within the scope of the claims.

For example, it can be applied to induction or hysteresis clutches and brakes other than eddy current type clutches and brakes. Further, the arrangement relationship between the stator 9 and the first rotating body 2 may be reversed depending on the application, and the excitation coil 3 or 10
Similar effects can be obtained even if the coil is of a fixed coil type, which is different from the coil rotating type that is built into the first rotating body 2 or the stator 9 and rotates together. As described above, this invention
A first rotating main body on the first rotating main body side and a stator side of the second rotating main body.
Since the second coupling body is magnetically interrupted and fixed, problems such as a decrease in clutch torque or brake torque caused by simultaneous activation of both functions during the clutch function or brake function can be reliably prevented. The configuration for achieving this effect can also be compactly configured without increasing the size, and is excellent in practical terms.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A first rotating body and a stator each having magnetic poles arranged on its circumference, such that different poles alternately appear in each magnetic pole of the first rotating body and the stator. two excitation coils that are magnetized, a second rotating body made of a non-magnetic material disposed between the first rotating body and the stator, a side of the second rotating body on the first rotating body side; a first connecting body made of a magnetic material that is fixed to the magnetic pole of the first rotating main body and can be magnetically coupled to the magnetic poles of the first rotating main body through a gap; An electromagnetic induction coupling device comprising a second coupling body made of a magnetic material that is magnetically isolated and fixed from the coupling body and capable of magnetically coupling with the magnetic poles of the stator through a gap. 2. In the device described in claim 1, the second rotating body has an annular shape, and the first and second connecting bodies are arranged at a predetermined distance between the inner and outer surfaces of the second rotating body. 1. An electromagnetic induction type coupling device, characterized in that the coupling devices are fixed opposite to each other through the coupling device.