User Manual EA4709 / EA4718
ElectroCraft
®
E-Mail: [email protected] www.electrocraft.com May 2009
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Demag current
Is the current level at which the motor magnets will start to be demagnetized. This is an
irreversible effect, which will alter the motor characteristics and degrade performance.
Drive
It‘s an electronic device that controls torque, speed and/or position of an AC or brushless
motor. Typically a feedback device is mounted in or on the motor for closed-loop control of
velocity and position.
Driver
Is the electronics which convert step and direction inputs to high power currents and
voltages to drive a step motor. The step motor driver is analogous to the servomotor
amplifier's logic.
Efficiency
The ratio of power output to power input.
Feedback
It is a signal which is transferred from the output back to the input for use in a closed loop
system.
Four quadrants
Refers to a motion system which can operate in all four quadrants; i.e., velocity in either
direction and torque in either direction. This means that the motor can accelerate, run, and
decelerate in either direction.
Inductance
The electrical equivalent to mechanical inertia; that is, the property of a circuit, which has a
tendency to resist current flow when no current is flowing, and when current is flowing has a
tendency to maintain that current flow.
