The electric motor with commutator has the coiled rotor, supplied with switch and brushes. There are two types of commutator motor: the repulsor motor and the series motor .
In the repulsion motor the brushes are short-circuited and, by the action of electromagnetic induction, the stator field produces a current in the rotor winding, which, in turn, will generate a magnetic 15hp 254tc motors field whose poles depend on the position of the brushes. The interaction of the fields causes the magnetic force to appear, causing the rotor to rotate.
As this type of engine has high starting torque and high speeds with light loads, it is applied in situations with heavy load starting. The alternating current series motors are similar to those of direct current, but they have an individualized behavior. For example, if a DC-series motor were to be connected to an alternating source, there would be great sparking on the brushes and low current consumption, because of the high impedance of the winding in series, not to mention the reduction in power output and power factor . The series AC motors have high efficiency in applications that have low frequency, mainly in electric locomotives, cranes and elevators.