variable drive motor

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

• Constant Torque: Motors particularly designed to handle constant torque loads, such as conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors specifically designed to handle variable torque loads such as for example pumps and fans.
Due to rapid switching and reflections in the cables, motors are at the mercy of 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 breakdown, resulting in possible sparking. ABB recommends:

Between 500 V and up 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 must have got a du/dt filter.
If the cable size between the drive and engine is greater 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 something for controlling the rotational speed of an alternating electric current electric engine. It handles the frequency of the electrical power supplied to the electric motor. A adjustable frequency drive is definitely a specific type of adjustable-swiftness drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-rate drives (VSD), AC drives, or inverter drives.

Automatic frequency control contain an primary electrical circuit converting the alternating electric current into a immediate current, then converting it back into an alternating electric current with the required frequency. Internal energy loss in the automated frequency control is ranked ~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 fans save energy by permitting the volume of atmosphere moved to complement the system demand.
Reasons for employing automatic frequency control may both be related to the efficiency of the application and for conserving energy. For example, automatic frequency control is utilized in pump applications where the flow can be matched either to volume or pressure. The pump adjusts its revolutions to confirmed setpoint with a Variable Drive Motor regulating loop. Adjusting the movement or pressure to the real demand reduces power intake.
An AC motor speed control-also known as a adjustable frequency drive, adjustable frequency drive, variable swiftness drive, adjustable swiftness drive and AC inverter-is an electro-mechanical object that can be utilized to change the output velocity of an AC electric motor by adjusting the insight frequency in to the motor.