What are the items of DC permanent magnet motor commutator inspection?

Commutation normalization inspection is a common method to find the cause of commutation accidents and troubleshooting DC permanent magnet motor, it includes the following main items, let's understand 

1. measure the interchip resistance of commutator

Measuring commutator interchip resistance can determine whether the lifting piece is broken and whether there is a commutator interchip short circuit. Inter-chip resistance checking is generally done by the step-down method, but special inter-chip resistance measuring equipment can also be used.

2. Commutator swing measurement

When the commutator is deformed or eccentric, it will make the brush jump and the sliding contact are not ideal when running, and it will lead to the deterioration of the commutator when it exceeds a certain value. High speed motors and multiple way armature winding motors are more sensitive.

3. Brush medium-sized surface inspection

Especially for large motors, reversible running motors and high speed motors, the brush neutral position should generally be strictly on the main pole centerline. If the brushes deviate from the neutral line, commutation will occur with overspeed and delay. The longitudinal armature reaction changes the external characteristics of the motor at different speeds in the two steering methods, as well as different external characteristics and different commutation strengths for the two steering methods. When the brush deviation from the neutral position is high, the motor will generate no-load spark when the commutation element enters the main pole flux region.

The above is the items of DC permanent magnet motor commutator inspection, hope it will help you, more related information welcome to consult us at any time