These motors are designed for the application requirements of variable rate drive systems. We offer both the subsequent types of motors:

• Constant Torque: Motors specifically designed to handle constant torque loads, such as conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors specifically designed to handle adjustable torque loads such as pumps and fans.
Due to quick switching and reflections in the cables, motors are at the mercy of more voltage stress in the windings when fed by frequency converters than with sinusoidal supply voltage. The result 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 may cause it to breakdown, resulting in possible 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 will need reinforced winding insulation and the drive must have got a du/dt filter.
If the cable length between your drive and motor is greater than 150 meters and the voltage is between 600 and 690 V, the motor must have reinforced winding insulation.
A variable-frequency drive is something for controlling the rotational swiftness of an alternating current electric motor. It regulates the frequency of the electrical energy supplied to the engine. A variable frequency drive is usually a specific kind of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-rate drives (VSD), AC drives, or inverter drives.

Automatic frequency control consist of an Variable Drive Motor primary electric circuit converting the alternating electric current into a immediate current, after that converting it back into an alternating current with the mandatory frequency. Internal energy reduction in the automated frequency control is rated ~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 followers save energy by permitting the volume of surroundings moved to match the system demand.
Reasons for employing automated frequency control can both be related to the features of the application and for saving energy. For example, automatic frequency control is used in pump applications where the flow can be matched either to volume or pressure. The pump adjusts its revolutions to a given setpoint with a regulating loop. Adjusting the circulation or pressure to the actual demand reduces power consumption.
An AC motor swiftness control-also known as a adjustable frequency drive, adjustable frequency drive, variable swiftness drive, adjustable rate drive and AC inverter-is an electro-mechanical object that can be used to improve the output rate of an AC motor by adjusting the insight frequency in to the motor.