Motor Control

03 8753 2881

Talk to us about your motor control needs!
We are well experienced in all common types of motor control.

DOL Starters
DOL starting of small motors is very common on small motors and is usually the cheapest method.  This applies to both single and three phase motors up to about 7.5kW, where local supply authorities usually require some form of assisted starting.  We have plenty of experience with DOL starting, dual speed and star-delta starters.

When a motor needs to vary the speed, for control or for energy efficiency a Variable Speed Drive (VSD) is used.  These are also commonly referred to VVVF or VFD’s.  Most VSD’s work by converting the incoming AC to DC voltage and then re-modulate a AC signal varying its frequency to suit the motors required speed.
We recommend Schneider and ABB Drives.

Like a VSD, these are used reduce starting current (or for mechanical sympathy) but once started are usually bypassed and the motor runs at full speed.  They can be used for de-acceleration and are typically 20-40% less in cost than a VSD.  However once bypassed they do not generate the same heat.
We typically stock and use Schneider SoftStarters.

Servos are like VSD’s in a roundabout way but have a position feedback that can accurately position a load, measure the force and typically respond to direction or speed changes rapidly.  Servos are 3 to 4 times the cost of VSD/ motor solution.
We favor the Allen Bradley and Mitsubishi Servo Systems.

DC Drives
DC Drives are still common place in industry.  Modern Vector AC drives have similar characteristics, like full torque at low speeds, and should be used due these days as DC motors require high maintenance times.
We use typically use the Parker (or Euroytherm) 590 DC Drives.