Unipolar motor

A unipolar motor is a type of small DC electric motor commonly found in small, portable cassette players. It is also used in stepper motors.

Its name is derived from its construction, which employs a magnetic strip wrapped around the inner wall of the housing such that one of its poles faces the inside, while the other faces outward. Although a true unipolar magnet (magnet with only one pole) exists only in theory, the name is appropriate for its function. The motor behaves as if the magnet were unipolar^{[citation needed]}, since only one of its poles is influencing the armature.