These motors are designed for the application requirements of variable speed drive systems. You can Variable Drive Motor expect both the subsequent types of motors:
• Constant Torque: Motors specifically designed to handle continuous torque loads, such as for example conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors specifically designed to handle adjustable torque loads such as for example pumps and fans.
Due to fast switching and reflections in the cables, motors are subject to more voltage stress in the windings when fed by frequency converters than with sinusoidal supply voltage. The result of these voltages is definitely an increase as high as 2.5 times the motor’s nominal voltage. This stresses the motor winding insulation and may cause it to break down, resulting in possible sparking. ABB recommends:
Between 500 V or more to 600 V, the motor needs to have reinforced winding insulation, or the drive must have a du/dt filter.
Above 600 V, the motor will need reinforced winding insulation and the drive is required to possess a du/dt filter.
If the cable size between your drive and motor is higher than 150 meters and the voltage is between 600 and 690 V, the electric motor will need to have reinforced winding insulation.
A variable-frequency drive is something for controlling the rotational swiftness of an alternating electric current electric engine. It handles the frequency of the electrical power supplied to the electric motor. A variable frequency drive can be a specific type of adjustable-rate drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-swiftness drives (VSD), AC drives, or inverter drives.
Automatic frequency control consist of an primary electric circuit converting the 
alternating electric current into a immediate current, then converting it back to an alternating current with the mandatory frequency. Internal energy reduction in the automatic frequency control is ranked ~3.5%
Variable-frequency drives are trusted on pumps and machine device drives, compressors and in ventilations systems for large buildings. Variable-frequency motors on supporters save energy by enabling the volume of atmosphere moved to match the system demand.
Reasons for employing automatic frequency control can both be linked to the features of the application and for saving energy. For instance, automatic frequency control can be used in pump applications where in fact the flow is usually matched either to volume or pressure. The pump adjusts its revolutions to confirmed setpoint with a regulating loop. Adjusting the movement or pressure to the actual demand reduces power usage.
An AC motor quickness control-also known as a adjustable frequency drive, adjustable frequency drive, variable acceleration drive, adjustable rate drive and AC inverter-is an electro-mechanical object that can be utilized to change the output speed of an AC motor by adjusting the input frequency in to the motor.