| Customization: | Available |
|---|---|
| After-sales Service: | Fast Service |
| Warranty: | One Year |
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Magnetic powde Clutch HOLLOW shaft type for plastic machinery
General introduction:
The magnetic powder clutch is composed of active rotor (input shaft),driven rotor(output shaft)
and yoke with excitation coil. The three parts are assembled relative concentric and form a system which can rotate relatively. The annular gap between active rotor and driven rotor is full of magnetic alloy powder which has high magnetic conductivity.
The magnetic powder will be in the state of loose situation when the current do not pass the excitation coil, the magnetic powder will be thrown on the inner wall of active rotor, in this case, there will not exist the interaction force between the active and driven rotor. So the magnetic powder clutch is in the state of separation, no torque transmission exits.
The magnetic powder in the working chamber will link in a link state under the action of the magnetic flux generated from the yoke when the current pass the excitation coil. The magnetic powder clutch can transfer torque relying on the shear force generated from magnetic chain and the friction generated from the magnetic powder and working face. In this situation, the magnetic powder clutch is in the combination state.
When the current is cut off, the magnetic flux will disappear along with the disappearance of the magnetizing current, the magnetic powder will be in the state of loose under the action of gravity again, and will be thrown on the inner wall of active rotor under the action of the centrifugal force.
In this case, the magnetic powder clutch will be in the state of separation again.
The magnetic powder clutch and brake have the same principle, the magnetic powder brake will form as long as driven rotor of the magnetic powder clutch is fixed.
Features:
The magnetizing current has a linear relationship with torque
The transmission torque has a linear relationship with the magnetizing current. The size of the torque can get controlled within larger range. Under normal circumstance, the magnetizing current
Has a linear relationship with transitive torque within range of 5%-100% rated torque.
Stable slip torque:
The slip rotational speed between driven rotor and active rotor do not affect the transitive torque when the magnetizing current retain unchanged, as shown in chart 4.That is to say, the static friction torque and the dynamic friction torque have no difference. Therefore, the torque can retain constant stably. The features are applied to tension control, users can control the tension of the roll material effectively as long as adjustment the magnetizing current accurately.
Prevention heat phenomenon from slip
The friction part will generate heat inevitably or even destroyed when it keep continuous sliding.
But this device has a complete cooling set, it will not generate a lot of heat after long time running and it has a long service life.
Due to the features of the magnetic powder clutch and brake ,they have been widely used in paper making ,printing, plastic items, rubber industry, textile industry and dyeing, wire and cable, metallurgy industry and tension control of winding and unwinding in roll material processing industry. A complete set of schematic of tension control system is as follows:
Notes:
Don't overload, meanwhile cool to appropriate temperature.
The value of the torque/rotational speed/slip power should be less than the rated value, The cooling model(natural cooling. forced air cooling/water cooling)should depend on the maximum slip power when it works and the cooling air should filter the water and oil. The temperature detector and the alarm device should be installed to prevent high temperature which can affect the service life of the magnetic powder.(the highest temperature is 80 degree)
The life of the magnetic powder clutch and brake rely on the life of the magnetic powder. Generally speaking, its service life is 4500-7500 hours in the state of non overloaded, but its service life can extend several times in some cases, such as: the working torque of the magnetic powder clutch/brake, relative slip rotational speed and slip power can be reduced to 50%-70% of the rated value. This is to say, the margin can be enlarged as soon as possible when designing.
Concerning the torque:
After the magnetic powder clutch and brake working, the magnetic powder will be in grinding at the beginning which lead to the torque decreasing slightly, but the gap can be compensated through adjustment the current.
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