Glossary

Used in power section of servo drives to invert the PWM signal to the servo motor.

The range of position increments in which the axis is considered by the controller to be at the commanded position point. Can be thought of in terms of +/- N position increments from the commanded position.

An electronic unit that converts high-level commands from a host computer, PLC, or operator panel into step and direction pulses needed by a stepping motor driver.

An axis or axes in the process of moving to a pre-programmed position, at a defined velocity and acceleration/deceleration rate.

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.

The property of an object to resist change in velocity unless acted upon by an outside force. Higher inertia objects require larger torques to accelerate and decelerate. Inertia is dependent upon the mass and shape of the object.

For most efficient operation, the system coupling ratio should be selected so that the reflected inertia of the load is equal to the rotor inertia of the motor.

A coordinated move of two or more axes in a linear and/or circular motion.

A drive that converts an AC power source to DC, then back to a variable frequency AC power source for a 3 phase induction motor.