variable drive motor

These motors are designed for the Variable Drive Motor application requirements of variable rate drive systems. We offer both the following types of motors:

• Constant Torque: Motors particularly designed to handle continuous torque loads, such as for example conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors specifically designed to handle variable torque loads such as pumps and fans.
Due to rapid 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 effect of these voltages can be an increase as high as 2.5 times the motor’s nominal voltage. This stresses the motor winding insulation and can cause it to break down, resulting in possible 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 needs to have reinforced winding insulation and the drive must possess 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 must have reinforced winding insulation.
A variable-frequency drive is something for controlling the rotational speed of an alternating current electric engine. It settings the frequency of the electrical energy supplied to the electric motor. A adjustable frequency drive is a specific type of adjustable-velocity drive. Variable-frequency drives are also 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 current into a immediate current, then converting it back into an alternating electric current with the required 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 fans save energy by permitting the volume of atmosphere moved to match the system demand.
Reasons for employing automatic frequency control can both be related to the functionality of the application and for conserving energy. For example, automatic frequency control is used in pump applications where in fact the flow is certainly matched either to volume or pressure. The pump adjusts its revolutions to confirmed setpoint with a regulating loop. Adjusting the circulation or pressure to the real demand reduces power usage.
An AC motor quickness control-also known as a variable frequency drive, adjustable frequency drive, variable velocity drive, adjustable velocity drive and AC inverter-is an electro-mechanical object that can be used to change the output rate of an AC electric motor by adjusting the input frequency in to the motor.