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stepping motor

Stepper motors are drives that execute a more or less finely graduated rotary motion. For this purpose, stepper motors are controlled with power signals that supply current to the individual windings of the stepper motor in the correct sequence.

Like any other motor, a stepper motor consists of a stator, which consists of one or two windings per phase, and a rotor. The rotor is moved by the stator field, and the direction of the movement depends on the direction of the stator field. A reversal of the magnetic field causes the rotor to rotate in the opposite direction.

The stator windings are controlled by a power stage with switching transistors. The power stage is controlled by a logic circuit which regulates the constant supply current by means of pulse width control. The pulse width is controlled via a feedback control loop leading from the power stage to the switching logic. Based on the clock frequency and the pulse width, the step frequency and width can be controlled.

Informations:
Englisch: stepping motor
Updated at: 07.05.2007
#Words: 167
Links: rotary, power (P), current, phase, field
Translations: DE
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