Permanent Magnet Stepper Motor

The permanent magnet design motor is perhaps the most common among several types of stepper motors. As the name implies, it adds permanent magnets to the motor construction. This type of stepper motors is also referred as can-stack motor or tin-can motor. The main advantage of this motor is its low manufacturing cost. This type of motor has 48-24 steps per revolution.

Construction Permanent Magnet Stepper Motor:

In this motor, the stator is of multipolar and its construction is similar to that of variable reluctance stepper motor as discussed above. It consists of slotted periphery on which stator coils are wound. It has projected poles on the slotted structure where the wound windings can be two or three or four-phase.

The end terminals of all these windings are bought out and connected to the DC excitation via solid state switches in the drive circuit.

The rotor is made up of a permanent magnet material like a ferrite that can be in the shape of either cylindrical or salient pole, but usually it is of smooth cylindrical type. The rotor designed to have an even number of permanent magnetic poles with alternate North and South polarities.