Describe the main features of a DC electric motor and the role of each feature

Motors and Generators > 1. Motors and Magnetic Forces >

Describe the main features of a DC electric motor and the role of each feature

  • Current supplied produces interacting magnetic field which keeps the motor spinning
  • Armature: laminated (reduces eddy current) ferromagnetic cylinder, rotates on axle to give actual motion, concentrates magnetic field to increase torque.
  • Coil: Wrapped around armature, medium for current, better motion with more coils at right angles
  • Split ring commutator: Changes direction of current to allow motion to continue
  • Brushes: Allows current flow into split ring
  • Magnets: Produce external magnetic field, curved magnets can improve torque (coil plane is always parallel)
  • Axle: provides centre of rotation