Magnetic Powder Brake Torque Abnormal Handling
Release Date:03/12/2019
The magnetic powder brake is currently the most ideal automatic actuator. When the magnetic powder brake starts to roll or unwind, the moment the magnetic powder brake starts to slip, a torque higher than the set value appears, which is reflected as a pull at startup. So what are the factors that cause this undesirable phenomenon to occur?
1: Thermal contraction of the driving body During high load operation, the thermally expanded driving body shrinks when it cools down, and there will be magnetic particles meshing between the driven bodies (magnetic gap). After the operation was stopped, a sign that the shaft could not rotate occasionally appeared in the early morning of the next day.
Handling method: ① After the operation is stopped, make the shaft idle a few times continuously. ② If it cannot be rotated, lightly hit the parts such as the couplings mounted on the shaft with a plumb or the like.
2: The magnetic powder deviates. When the magnetic powder is unevenly distributed inside the magnetic powder brake, if the clutch excitation setting is turned on, the magnetic powder will be solidified in an unevenly distributed environment. Rotating in this state will cause the magnetic powder to deteriorate, which will produce higher torque than the set value. Usually, the value is less than a few percentage points of the set torque. However, when the magnetic powder is wet with water or oil, the value may increase when the magnetic powder is deviated from tension.
Handling method: ① Set the delay on to make the excitation turn on for a few seconds after the clutch starts to rotate. ② During clutch deceleration and idling, weak excitation of about 5 to 10% of the rated current is connected.
When the magnetic powder brake fails, the cause should be checked and dealt with in time. In order to avoid some unnecessary failures, it is recommended to choose Tianji transmission high precision high quality magnetic powder brake.
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