The most popular step angle is 1.8°.įigure 2.57. The step angle depends on the method of construction and is generally in the range 0.9-5°. The rotor consists of a cylindrical magnet which is axially magnetized. Typically, the stator has eight salient poles which are energized by a two-phase winding. Hybrid: The hybrid stepper motor is a combination of the previous two types. PM stepper motors give a large step angle, ranging from 45° to 120°. Permanent magnet: The rotor used in the PM-type stepper motor consists of a circular permanent magnet mounted onto the shaft. This type of stepper motor provides small to medium-sized step angles and is capable of operation at high stepping rates. The number of teeth on the rotor and stator, together with the winding configuration and excitation, determines the step angle. Variable reluctance: This type of stepper motor has a soft iron multi-toothed rotor with a wound stator. There are three basic types of stepper motor: 1. Stepper motors are capable of driving a 2.2 kW load with stepping rates from 1000 to 20 000 per second in angular increments from 45° down to 0.75°.
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