In fact, the commutator blades in the commutator are not numbered, but in order to borrow the needs of bias wiring, as well as the needs of technical exchange and recording, we number the commutator blades in the commutator in four cases.
1. Number of commutator when facing the right-hand winding
2. Number of commutator when the right-hand winding is biased
3. Number of commutator when facing the left row winding
4. The number of the commutator when it is biased towards the right winding is rare because of the left winding. The most commonly used are the number of the commutator when it is facing the right winding and the number of the commutator when it is biased towards the right winding.