These motors are designed for the application form requirements of variable velocity drive systems. We offer both the subsequent types of motors:
• Constant Torque: Motors particularly designed to handle constant torque loads, such as for example 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 effect 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 can cause it to breakdown, resulting in feasible sparking. ABB recommends:
Variable Drive Motor between 500 V or more to 600 V, the motor needs to have 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 is required to have got a du/dt filter.
If the cable length between your drive and electric motor 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 something for controlling the rotational velocity of an alternating current electric electric motor. It controls the frequency of the electrical energy supplied to the engine. A variable frequency drive is definitely a specific kind of adjustable-velocity drive. Variable-frequency drives are also called adjustable-frequency drives (AFD), variable-rate drives (VSD), AC drives, or inverter drives.
Automatic frequency control consist of an primary electric circuit converting the alternating current into a immediate current, after that converting it back to an alternating current with the mandatory frequency. Internal energy loss in the automatic frequency control is rated ~3.5%
Variable-frequency drives are widely used on pumps and machine tool drives, compressors and in ventilations systems for huge buildings. Variable-frequency motors on supporters save energy by enabling the volume of air flow moved to match the system demand.
Reasons for employing automated frequency control may both be linked to the functionality of the application and for saving energy. For example, automatic frequency control is utilized in pump applications where in fact the flow is definitely matched either to volume or pressure. The pump adjusts its revolutions to a given setpoint via a regulating loop. Adjusting the flow or pressure to the actual demand reduces power intake.
An AC motor swiftness control-also referred to as a variable frequency drive, adjustable frequency drive, variable quickness drive, adjustable swiftness drive and AC inverter-is an electro-mechanical object that can be utilized to change the output speed of an AC electric motor by adjusting the input frequency into the motor.