These motors are designed for the application requirements of variable swiftness drive systems. We offer both the subsequent types of motors:
• Constant Torque: Motors specifically designed to handle continuous torque loads, such as 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 fast switching and reflections in the cables, motors are subject to 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 of up to 2.5 times the motor’s nominal voltage. This stresses the electric motor winding insulation and can cause it to break down, 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 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 motor 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 Drive Motor variable-frequency drive is something for controlling the rotational swiftness of an alternating electric current electric engine. It settings the frequency of the electrical power supplied to the engine. A variable frequency drive can be a specific kind of adjustable-swiftness drive. Variable-frequency drives are also called adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, or inverter drives.
Automatic frequency control consist of an primary electric circuit converting the alternating electric current into a immediate current, after that converting it back to an alternating electric current with the required frequency. Internal energy loss in the automated 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 enthusiasts save energy by enabling the volume of atmosphere moved to match the system demand.
Reasons for employing automatic frequency control can both be linked to the features of the application form and for saving energy. For instance, automatic frequency control can be used in pump applications where in fact the flow is certainly matched either to quantity or pressure. The pump adjusts its revolutions to confirmed setpoint via a regulating loop. Adjusting the circulation or pressure to the real demand reduces power intake.
An AC motor velocity control-also referred to as a variable frequency drive, adjustable frequency drive, variable swiftness drive, adjustable velocity drive and AC inverter-is an electro-mechanical object that can be utilized to change the output acceleration of an AC electric motor by adjusting the insight frequency into the motor.