These motors are created for the application requirements of variable velocity drive systems. We offer both the subsequent types of motors:
• Constant Torque: Motors specifically designed to handle constant torque loads, such as for example conveyors, positive displacement pumps, cranes, etc.
• Variable Torque: Motors particularly designed to handle variable torque loads such as for example pumps and fans.
Due to speedy 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 is definitely an increase as high as 2.5 times the motor’s nominal voltage. This stresses the engine winding insulation and may cause it to break down, resulting in possible sparking. ABB recommends:
Between 500 V and up 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 is required to have a du/dt filter.
If the cable duration between the drive and engine is higher than 150 meters and the voltage is between 600 and 690 V, the engine will need to have reinforced winding insulation.
A variable-frequency drive is something for controlling the rotational quickness of an alternating electric current electric electric motor. It settings the frequency of the electrical energy supplied to the electric motor. A variable frequency drive can be a specific kind of adjustable-swiftness drive. Variable-frequency drives are also called adjustable-frequency drives (AFD), variable-quickness drives (VSD), AC drives, or inverter drives.
Automatic frequency control contain an primary electric circuit converting the alternating electric current into a immediate current, then converting it back to an alternating electric current with the mandatory frequency. Internal energy reduction in the automatic frequency control is rated ~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 functionality of the application form and for saving energy. For example, automatic frequency control can be used in pump applications where the flow is definitely matched either to quantity or pressure. The pump adjusts its revolutions to confirmed setpoint via a regulating loop. Adjusting the movement or pressure to the actual demand reduces power consumption.
An AC motor acceleration control-also referred to as a variable frequency drive, Variable Drive Motor adjustable frequency drive, variable acceleration drive, adjustable quickness drive and AC inverter-is an electro-mechanical object that can be utilized to improve the output rate of an AC electric motor by adjusting the input frequency in to the motor.