Vector motors are definite purpose motors that are responsive to the other forces within the processes they power. A 3 phase motor, their variable frequency drive control method contributes to a force sensitive switching system which responds quickly to speed and rotational force changes. This attribute makes them the motor of choice for applications such as conveyors, machine tools, pumps, and fans, as well as cranes, hoists, and other material handling equipment. These Marathon motors are built for open controls but can be used in closed-loop systems, as well. Products vary by HP, voltage, shaft diameter, frame, motor enclosure design and other considerations.