These motors are made for the application form requirements of variable quickness drive systems. We offer 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 rapid switching and reflections in the cables, motors are at the mercy of more voltage tension in the windings when fed by frequency converters than with sinusoidal supply voltage. The effect of these voltages can be an increase of up to 2.5 times the motor’s nominal voltage. This stresses the engine winding insulation and can cause it to break down, resulting in feasible sparking. ABB recommends:
Between 500 V or more to 600 V, the motor will need reinforced winding insulation, or the drive will need to have a du/dt filter.
Above 600 V, the motor needs to have reinforced winding insulation and the drive is required to have got a du/dt filter.
If the cable length between your drive and engine is greater than 150 meters and the voltage is between 600 and 690 V, the electric motor must have reinforced winding insulation.
A variable-frequency drive is a system for controlling the rotational speed of an alternating current electric electric motor. It settings the frequency of the electrical energy supplied to the engine. A adjustable frequency drive can be a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-quickness drives (VSD), AC drives, or inverter drives.
Automatic frequency control consist of an primary electric circuit converting the alternating current into a Variable Drive Motor immediate current, after that converting it back to an alternating electric current with the mandatory frequency. Internal energy reduction in the automated frequency control is ranked ~3.5%
Variable-frequency drives are widely used on pumps 
and machine device drives, compressors and in ventilations systems for huge buildings. Variable-frequency motors on fans save energy by enabling the volume of surroundings moved to complement the system demand.
Reasons for employing automatic frequency control may both be related to the functionality of the application form and for conserving energy. For example, automatic frequency control can be used in pump applications where in fact the flow is 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 real demand reduces power consumption.
An AC motor rate control-also referred to as a variable frequency drive, adjustable frequency drive, variable rate drive, adjustable speed drive and AC inverter-is an electro-mechanical object that can be utilized to improve the output speed of an AC electric motor by adjusting the insight frequency in to the motor.