What is stepper motor? Classification of stepper motor

It is a combination of features of the permanent magnet stepper motor and variable reluctance stepper motor. The most commonly used hybrid stepper motor is the two-phase type. This type contains four poles and operates on one phase on excitation. It gives excellent performance in step revolution, speed, and torque. Its step angle ranges from 200 to 400 steps per revolution.

Also Read: Induction Motor definition and working principles

  • Claw tooth permanent magnet motor-

It is also known as a ‘can-stack stepping motor’ because its stator consists of a metal can. Teeth are punched out of the circular metal sheet and then a bell-shaped circle is drawn out. Next, the teeth are drawn inside to form claw teeth. The stator stack is made by joining two bell-shaped casing, where the teeth of both bell-shaped casings are intermeshed and toroid coil is placed inside them.

Although this type of motor has a low manufacturing cost, its step angle is difficult to reduce.

Also Read: Induction Motor definition and working principles

  • Single phase stepping motor-

This type of motor is designed to work from a single phase power supply. These are commonly used in clocks, timers, and counters. A single phase stepping motor uses one or more permanent magnets which are required to raise the torque to input power ratio in a miniature motor. Its stator is made of silicon steel stamping with two poles.

 

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