 | S1, S3 brush without operating problems. |  | |  | S5 normal operation with low dust influence. | | Damaged brush surface status | |  | S7 scratches.
Causer: low load. |  | S9 scratches and tranches.
Causer: very low load. |  | S11 partial dark area on a uniform porous surface.
Causer: unadjusted neutral zone or auxiliary poles. |  | S13 burning of incoming or outgoing lamella.
Causer: intensive sparking due to collector ovallity, low brush preasure or unadjusted holder. |  | S15 erosioned brush surface.
Caused: overload, contact lost. |  | S17 lamellas replica on brush surface.
Causer: incorrect winding connection. |  | S19 „double surface“.
Causer: brush position changing due to rotating direction. |  | S21 cooper shatters.
Causer: consequent of cooper insertion usually (fig. L10). |  | S23 broken edges.
Causer: very rised lamella, oval collector, brush jumping when motor is idle. |
|
