Reminder from the supplier of energy feedback devices for frequency converters: What is the principle of energy saving for frequency converters? In fact, energy conservation of frequency converters is not absolute. They themselves consume electricity and have losses. The main purpose of frequency converters is to regulate the speed of asynchronous motors. Some devices use more electricity if the motor is larger, but the power factor is low, which means that electricity is wasted by the motor. Using frequency converters can improve the power factor, so energy conservation can be achieved.
Variable frequency energy-saving:
In order to ensure the reliability of our production, various production machinery will have some flexibility in designing power. The motor cannot operate at full load. In addition to meeting the requirements of power drive, excess force increases the consumption of active power, which leads to the waste of electrical energy. When the pressure is high, the operating speed of the motor can be reduced. It can also save energy under constant pressure. When the motor speed changes from N1 to N2, the change in motor shaft power (P) is as follows: P2/P1=(N2/N1) 3, indicating that reducing the motor speed can achieve significant energy-saving effects.
Dynamic adjustment energy-saving:
Quickly adapt to load changes and provide the most effective voltage. The frequency converter has a measurement and control output function of 5000 times per second in the software, which ensures that the output of the motor always runs efficiently.
Self frequency conversion function saves energy:
The V/F curve can be automatically adjusted through the frequency conversion function: while ensuring the output torque of the motor, the V/F curve can be automatically adjusted. The output torque of the motor decreases, and the input current decreases, achieving an energy-saving state.
Variable frequency startup energy-saving:
When the motor is started at full voltage, due to the starting torque of the motor, it needs to absorb 7 times the rated current of the motor from the power grid, resulting in a large starting current and voltage fluctuations in the power grid. There are still many damages, which will increase line loss and damage. After soft start, the starting current can be reduced from 0 to the rated current of the motor, reducing the impact of starting current on the power grid, saving electricity costs, and reducing the inertia of starting inertia to ensure high inertia equipment and prolong its use.
Improve power factor and save energy:
The motor generates torque through the electromagnetic action of the stator winding and rotor winding. The winding has an inductive effect. For the power grid, impedance characteristics are inductive, and motors absorb a large amount of reactive power during operation, resulting in a low power factor. After adopting a variable frequency energy-saving speed regulator, its performance has been changed to AC-DC-AC. After rectification and filtering, the load characteristics have changed. The frequency converter has impedance characteristics against the power grid, high power factor, and reduces reactive power loss.