Variable frequency drives are also categorized by the following load torque and power characteristics:

Power electronics based variable frequency drives are rapidly making older technology redundant.

The Autotransformer motor starting apparatus is relatively simple compared to solid-state variable frequency drives.

Thus it is not possible to control the motor if the output frequency of the variable frequency drive is zero.

A motor control center can include variable frequency drives, programmable controllers, and metering and may also be the electrical service entrance for the building.

Benshaw is a company that specializes in solid state reduced voltage electric motor controls, motor protection and variable frequency drives.

The low-speed wind tunnel is a closed-circuit, continuous flow tunnel with a 100 hp, variable frequency drive.

The plant has energy-efficient motors, variable frequency drives, and systems to measure and monitor carbon levels.

Other examples of nonlinear loads are battery chargers, electronic ballasts, variable frequency drives, and switching mode power supplies.

Once Stuxnet determines it has infected the targeted system or systems, it begins intercepting commands to the frequency drives, altering their operation.