These motors are made for the application form requirements of variable velocity drive systems. We offer both the following types of motors:

• Constant Torque: Motors Variable Drive Motor particularly designed to handle continuous torque loads, such as 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 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 is definitely an increase as high as 2.5 times the motor’s nominal voltage. This stresses the electric motor winding insulation and may 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 must have a du/dt filter.
Above 600 V, the motor will need reinforced winding insulation and the drive is required to have a du/dt filter.
If the cable length between the drive and engine 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 a system for controlling the rotational rate of an alternating electric current electric electric motor. It settings the frequency of the electrical power supplied to the engine. A variable frequency drive is usually a specific kind of adjustable-swiftness drive. Variable-frequency drives are also called adjustable-frequency drives (AFD), variable-velocity drives (VSD), AC drives, or inverter drives.

Automatic frequency control consist of an primary electrical circuit converting the alternating current into a immediate current, after that converting it back into an alternating current with the required 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 large buildings. Variable-frequency motors on followers save energy by permitting the volume of air flow moved to complement the system demand.
Reasons for employing automatic frequency control can both be related to the functionality of the application form and for conserving energy. For instance, automatic frequency control is utilized in pump applications where in fact the flow can be matched either to volume or pressure. The pump adjusts its revolutions to a given setpoint via a regulating loop. Adjusting the stream or pressure to the actual demand reduces power intake.
An AC motor acceleration control-also known as a adjustable frequency drive, adjustable frequency drive, variable quickness drive, adjustable rate drive and AC inverter-is an electro-mechanical object that can be utilized to change the output velocity of an AC motor by adjusting the insight frequency into the motor.