Powder Dynamometers
OMSHAM powder Dynamometers, use fine magnetic Metal Powder to offer braking torque.
Easy wide range torque control
Braking torque control over a wide range can be achieved easily, for braking torque changes in proportion to the excitation current.
Usable under continuous slip conditions
With the use of fine magnetic powder to transmit braking torque, continuous slip on the operating surface is possible and since braking torque is independent of slip speed, braking torque transmission performance is always stable.
Stable Torque transmission
With ideal operating surface, torque stability is maintained, even when the current is repetitively switched ON and OFF
Large Heat Capacity
Highly heat tolerant powder and have an ideal cooling structure that can be used under extremely demanding continuous slip conditions.
Smooth engagement and driving
Coefficients of static and dynamic frictions are nearly equal, which eliminates shocks during complete engagement and allows load-proportionate acceleration/deceleration.
Basic Structure and Operation
It consists two concentric parts - a driving member and a driven member each supported by their own bearing supports and free to move. In between the driving and driven member, fine magnetic powder is filled. A excitation coil is placed outside to provide excitation current to the powder.
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When coil is not excited, the driving and driven member are free to rotate and remain dis-engaged. When coil is excited, magnetic flux passes through the powder, and powder forms a bridge between the driven and driving member and offers friction. With this, both members gets engaged and torque is transmitted from driving member to driven member. By varying the excitation, the friction force is varied and there by torque transmission from driving member to the driven member.
Now, we arrest one member with the load sensing arrangement. In such case, the other member offers friction for the rotation. The friction offered can be controlled by varying excitation and can be sensed by the load sensing arrangement.
Applications
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Small Motor Testing
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Testing of various rotating components in automobiles and other industries
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Test equipments for educational institutes
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