Stepper Motor Controllers

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Stepper Motor Controllers

STEPPER MOTOR DRIVER BASICS:

A stepper motor driver or step motor drive receives signals from an indexer or controller (usually a computer). Step signals and direction signals are received and converted into electrical pulses and sent to the stepper motor. One pulse is needed tor every step. Therefore, in full step mode and using a standard 200 step motor, 200 pulses would be needed to complete one full revolution of the stepper motor. The frequency of the pulses from the stepper motor controller would control the speed that the motor rotates. (more)

(Continued from Above) The speed and torque of a stepper motor is a function of the flow of current from the stepper motor driver to the windings of the motor. The factor that limits the current flow, or limits the time it takes for the windings to become energized is referred to as inductance. To compensate for inductance, most stepper motor drives are designed to provide more voltage than the step motor's rated voltage. The higher the voltage from the stepper motor drive, the higher the level of torque relative to speed. Usually, the output voltage from the stepper motor driver ( also referred to as bus voltage) should be rated from five and up to twenty times higher than the stepper motor's rated voltage. So, to protect the motor from damage, the stepper motor driver should be current limited to the current rating of the stepper motor.