Hengli Motor takes you to understand the mechanism of motor shaft current generation

The reason for the generation of motor shaft current is due to shaft voltage. And the shaft voltage is generated through the alternating magnetic flux of the motor shaft. Normally, the electromagnetic field of a motor is symmetrical and there is no axial magnetic field. When the magnetic circuit of the motor is asymmetric, or when the frequency converter supplies power or the permanent magnet is excited, there will inevitably be axial alternating magnetic flux.

Therefore, the main reason for the generation of shaft voltage is the asymmetry of the magnetic circuit between the motor stator and rotor, and the imbalance of the power supply, which in turn forms an alternating axial magnetic field that induces shaft potential inside the magnetic shaft. When the end cap, bearing, shaft, and casing form a conductive circuit, induced current flows through the bearing, causing it to heat up and suffer from electrical corrosion damage.