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 |
 |
 |
| Salient-poled steel | Permanent-magnet 2-pole | Permanent-magnet 4-pole | Commutator | Commutator |
 |
 |
 |
 |
 |
| Squirrel-cage copper | Squirrel-cage brass | Salient-poled squirrel-cage | Semihard-steel | Solid-steel |
|
|
|
|
|
| Salient-poled steel | Permanent-magnet 2-pole | Permanent-magnet 4-pole | Commutator | Commutator |
|
|
|
|
|
| Squirrel-cage copper | Squirrel-cage brass | Salient-poled squirrel-cage | Semihard-steel | Solid-steel |