<P> Repulsion motors are wound - rotor single - phase AC motors that are a type of induction motor . In a repulsion motor, the armature brushes are shorted together rather than connected in series with the field, as is done with universal motors . By transformer action, the stator induces currents in the rotor, which create torque by repulsion instead of attraction as in other motors . Several types of repulsion motors have been manufactured, but the repulsion - start induction - run (RS - IR) motor has been used most frequently . The RS - IR motor has a centrifugal switch that shorts all segments of the commutator so that the motor operates as an induction motor once it is close to full speed . Some of these motors also lift the brushes out of contact with source voltage regulation . Repulsion motors were developed before suitable motor starting capacitors were available, and few repulsion motors are sold as of 2005 . </P> <P> Where speed stability is important, some AC motors (such as some Papst motors) have the stator on the inside and the rotor on the outside to optimize inertia and cooling . </P> <P> A conical rotor brake motor incorporates the brake as an integral part of the conical sliding rotor . When the motor is at rest, a spring acts on the sliding rotor and forces the brake ring against the brake cap in the motor, holding the rotor stationary . When the motor is energized, its magnetic field generates both an axial and a radial component . The axial component overcomes the spring force, releasing the brake; while the radial component causes the rotor to turn . There is no additional brake control required . </P> <P> The high starting torque and low inertia of the conical rotor brake motor has proven to be ideal for the demands of high cycle dynamic drives in applications since the motor was invented, designed and introduced over 50 years ago . This type of motor configuration was first introduced in the USA in 1963 . </P>

Study and identify the type of given ac moter