When to consider Medium Voltage motors?

Most induction motors run on supply voltages under 600V. Motors operating at low voltages limit the output power and current carrying capacity for large and heavy industrial loads. To address these issues, Medium Voltage motors are designed.

MV motors are present everywhere from utilities to process industries in applications such as large compressors, crushers, fans, conveyors, pumps, and other related machines.

There are several factors to consider when evaluating new installation of a medium voltage motor.

“Motors operating at low voltages limit the output power and current carrying capacity for large and heavy industrial loads. To address these issues, Medium Voltage motors are designed.

1. Application

It’s a well-known fact that electric motors consume 50% of the energy generated for the industry. Therefore, making the right decision on large application loads becomes much important. Medium voltage motors are typically designed with a form coil winding design which provides better cooling and improved reliability in operations.

Another important factor to consider is the way in which the load will be energized and controlled. Generally, the utilities will provide a provision for DOL, reduced voltage starting or a variable frequency drive. In certain cases, the application will determine the starting method which further narrows down the selection process.

2. Cost

Medium voltage is relevant for heavy applications which require a motor with an output of 500 HP and above. The higher voltages in these instances make it possible to use smaller cables thereby decreasing cost of distribution cables. By increasing the voltage, the current is lowered which in turn allows to use smaller distribution cables. This becomes more significant in cases where the cables must be laid over long distances.

3. Other Considerations

When you move from low to medium voltage machines, the pool of experienced and knowledgeable people is reduced significantly. Most of the technicians do not possess the knowledge about procedures and protocols that come with higher voltage designs. As an owner of these systems, it becomes inevitable to have a team that understands the science behind medium voltage equipment and be capable to address the arising issues in house. The use of medium voltage motors therefore requires comprehensive advice and close dialogue.