Mirror shaft processing factory introduces you to the motor shaft current

First we have to analyze the cause of the current formation. Under normal circumstances, there is a lubricating oil film between the rotating shaft and the mirror shaft, which acts as an insulation. For lower shaft voltages, this layer of lubricant film still protects its insulation without generating shaft current. However, when the shaft voltage increases to a certain value, especially when the motor is started, the lubricating oil film in the mirror shaft is not formed stably, the shaft voltage will break through the oil film and discharge, forming a loop, and the shaft current will be in metal contact from the mirror shaft and the rotating shaft. Point passing, because the metal contact point is small, the current density of these points is large, and the high temperature is generated instantaneously, so that the mirror shaft is partially melted, and the melted mirror shaft alloy splashes under the action of the rolling pressure, so that the mirror surface Small pits are burned on the inner surface of the shaft. For its prevention, we must guard against it for its reasons.

 1. In order to prevent shaft current from being caused by magnetic imbalance, etc., an insulating spacer is often added at the mirror shaft seat and the mirror shaft bracket of the non-shaft end to cut off the circuit of the shaft current.

 2. In order to avoid the shaft current caused by the insulation damage of other motor accessories, it is often required that the maintenance personnel carefully inspect and strengthen the insulation of the wires or gaskets to eliminate unnecessary shaft current hazards.

 3. Install a grounding carbon brush on the shaft end to reduce the shaft potential, make the grounding carbon brush reliably ground, and make reliable contact with the rotating shaft to ensure that the shaft potential is zero potential, thereby eliminating the shaft current. Generally, through the above processing, the shaft current of most motors is negligible, which has not substantially harmed the motor-drive mechanism. However, the advantage after processing is that the actual service life can be increased from tens of hours to tens of thousands of hours. Therefore, it is still necessary for its prevention.

The above is the relevant information introduced by the mirror axis processing factory. If you need to know more, please contact us!