Motor Control Systems and Variable Speed Drives

Variable speed drives (VSDs) allow loads driven by AC induction motors (such as fans and pumps) to operate in a wide range of speeds compared to the motor fixed speed. VSDs are also called variable-frequency drives, adjustable-speed drives, variable-frequency inverters, or frequency converters.

VSD installations can increase energy efficiency (in some cases energy savings can exceed 50%), improve power factor and process precision, and provide other performance benefits such as soft starting and over-speed capability. They also can eliminate the need for expensive and energy-wasting throttling mechanisms such as control valves and outlet dampers.

VSDs can provide significant savings in applications such as:

• Variable air volume air conditioning systems
• Chilled water pumping
• Exhaust air systems, such as dust extraction, paint shop exhaust, and fume cupboards
• Refrigeration systems
• Some modern compressors (including air and refrigeration compressors)

Ryan Wilks can design, manufacture and install your motor control and VSD system.