 Texas Zepher wrote: |
| Coreless motors that have the perminant magnet turning inside of the fixed wire windings field. Depending on how the power is applied to the windings the magnet adjusts its position accordingly. Many submersible fish tank filter motors work this way from simple 60Khz AC power. The power to the windings can be controlled digitally creating exact movements of the armature so one can create things like stepper motors, and variable speed based on frequency. |
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That's one type of coreless motor. The other type has the windings wound into a cup shape with a sort of epoxy holding them together, and they're mounted to the armature with the usual DC motor commutator at one end. The permanent magnet is a cylinder shape and has a hole going through the middle for the motor's shaft. The cup-shaped windings turn around the cylinder-shaped magnet.