variable drive motor

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

• Constant Torque: Motors 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 speedy switching and reflections in the cables, motors are subject to more voltage tension in the windings when fed by Variable Drive Motor frequency converters than with sinusoidal supply voltage. The effect of these voltages is definitely an increase of up to 2.5 times the motor’s nominal voltage. This stresses the engine winding insulation and will cause it to break down, resulting in possible sparking. ABB recommends:

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 needs to have reinforced winding insulation and the drive must have got 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 acceleration of an alternating electric current electric engine. It handles the frequency of the electrical energy supplied to the engine. A variable frequency drive is usually a specific type of adjustable-velocity drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed 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 loss in the automatic frequency control is ranked ~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 moved to complement the system demand.
Reasons for employing automated frequency control can both be related to the efficiency of the application form and for saving energy. For instance, automatic frequency control is used in pump applications where in fact the flow is usually matched either to quantity or pressure. The pump adjusts its revolutions to a given setpoint via a regulating loop. Adjusting the flow or pressure to the real demand reduces power consumption.
An AC motor speed 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 used to improve the output swiftness of an AC motor by adjusting the input frequency in to the motor.

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