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 for example conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors particularly designed to handle adjustable torque loads such as for example pumps and fans.
Due to speedy switching and reflections in the cables, motors are subject to more voltage tension in the windings when fed by frequency converters than with sinusoidal supply voltage. The result of these voltages can be an increase as high as 2.5 times the motor’s nominal voltage. This stresses the engine winding insulation and will cause it to breakdown, resulting in feasible 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 must have got a du/dt filter.
If the cable duration between your drive and electric motor is higher than 150 meters and the voltage is between 600 and 690 V, the engine will need to have reinforced winding insulation.
A variable-frequency drive is a system for controlling the rotational rate of an alternating current electric engine. It settings the frequency of the electrical energy supplied to the engine. A variable frequency drive is usually a specific type of adjustable-quickness drive. Variable-frequency drives are also Variable Drive Motor called adjustable-frequency drives (AFD), variable-acceleration drives (VSD), AC drives, or inverter drives.
Automatic frequency control consist of an primary electrical circuit converting the alternating electric current into a immediate current, then converting it back into an alternating electric current with the mandatory frequency. Internal energy loss in the automatic frequency control is rated ~3.5%
Variable-frequency drives are trusted on pumps and machine tool drives, compressors and in ventilations systems for large buildings. Variable-frequency motors on enthusiasts save energy by permitting the volume of air moved to complement the system demand.
Reasons for employing automatic frequency control can both be related to the functionality of the application and for saving energy. For example, automatic frequency control can be used in pump applications where in fact the flow is definitely matched either to quantity or pressure. The pump adjusts its revolutions to confirmed setpoint via a regulating loop. Adjusting the stream or pressure to the actual demand reduces power intake.
An AC motor speed control-also known as a variable frequency drive, adjustable frequency drive, variable speed drive, adjustable quickness drive and AC inverter-is an electro-mechanical object that can be used to change the output swiftness of an AC engine by adjusting the insight frequency in to the motor.