How is a stepper motor constructed?
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Stepper motors are synchronous motors. The stepper motor is made up of a magnetic rotor and several spatially offset stator coils. In order to generate a magnetic field, a current flows through the coils. Reversing the current direction changes the polarity of the electrical magnetic field. If this takes place in a defined sequence, a rotating stator field results that follows the toothed permanent magnet of the rotor. The electrical pulses thus determine the speed of the rotary magnetic field and the rotor transforms these pulses into a mechanical rotary motion with a defined step angle.
The rotor of the motor is ball bearing mounted on both sides of the motor. It has no commutators or slip ring capsules which means the expected service life of a motor depends on the load that acts on the ball bearings. We state that our motors have a L10h service life of approx. 20,000 operating hours when they are operated with the nominal loads (see Datasheet).
