Using inverters is one of the ways to reduce energy and save. The use of inverters reduces the energy consumption and therefore reduces the cost of electricity, reduces the starting current and thus prolongs the life of the motor, the possibility of changing the speed and movement of the motor, having protection against overload, the possibility of working the motor in conditions where the input voltage is variable. , the possibility of remote control makes the speed higher than the rated speed of the motor and generally has various advantages, especially for the motor in the system.
In general, inverters are used for the following reasons:< br>
Adapting the speed of inverters with process requirements.
Adapting inverter torque with process requirements.
Energy saving and improving efficiency.
Inverter application in creating variable torque
Loads applied to AC drives are divided into two groups: 1: constant torque 2: variable torque
The energy saving ability of variable torque loads is much higher than constant torque loads. Variable torque loads include pumps and centrifugal fans, which mostly form HVAC applications, which is an abbreviation of the words Heating, ventilation, and air conditioning, which refers to the set of technologies related to heating, ventilation, and air conditioning. It is said to include technologies related to creating comfort through ventilation and creating comfortable temperature conditions for the indoor environments of the building. Constant torque loads include vibrating conveyors, punch presses, stone crushers, machine tools and applications. There are others in which the drive follows a fixed V/F ratio, meaning that as the frequency changes, the voltage will change in the same ratio.
The use of an inverter to reduce energy consumption
AC drives or inverters allow us to consume less energy than other speed control techniques when the load requirements are less than full speed,
Why variable torque loads in inverters Industrial energy saving?
An inverter with its energy saving function first optimizes its slip by determining the amount of force applied to the motor, then the amount of power that should be applied to the motor. will calculate based on the frequency spectrum, motor set parameters, and power measurements.
Most inverters have PID capability for fan and pump applications, which allows the inverter to set-point The basis of real feedback is to maintain the process. A transducer or transmitter is used to detect process variables such as pressure level, liquid flow rate, air flow rate, or liquid level, then the signal is sent to the PLC, which sends feedback from the process to the drive. The drive uses this continuous feedback to adjust itself to maintain the set point.
کاربرد اینورتر در افزایش طول عمر تجهیزات و کاهش تعمیر و نگهداری
Single speed methods start the motor suddenly and subject it to high starting torque and current fluctuations that are up to 10 times full load current. On the other hand, AC inverters uniformly and gradually increase the motor to operating speed in order to reduce mechanical and electrical stress, reduce maintenance costs and increase the life of the motor and related equipment. Soft starters are able to increase the speed of the motor gradually, but due to the voltage control, they can only reduce the starting current from 10 times to 5 times, but in drives, we see that the starting current is rarely higher than the current The motor rating is increased and the drives can be programmed to increase the motor speed much more gradually and smoothly and can run the motor at less than full speed to reduce wear and tear.
Many reasons. And there are different types of inverters in the industry. In some applications, such as paper machines, they cannot start without drives, while in some other applications, such as centrifugal pumps, drives can be very useful for saving energy.
What is the motor or drive controller?
Due to the increasing use of induction motors in industry, the control of these motors has become particularly important. Electric drive in an electric motor is a system that controls the speed and torque of an electric motor. The drive is a system for controlling the rotation speed of an AC motor by controlling the frequency of the power supply applied to the electric motor. adjustable) or VSD (variable speed drive).
Drive performance method
To change the engine speed, it is necessary to change the frequency of the engine. According to the formula N=F*60/P (where N is the speed of the motor, F is the frequency of the mains electricity and P is the number of poles of the motor) it can be seen that to change the speed of N, the value of the frequency of F must be changed.
On the other hand, because the current of the motor is proportional to the ratio of the voltage to the frequency of V/F applied to the motor, then reducing the frequency alone increases the current of the motor. Therefore, to change the speed of the motor, it is necessary to change the frequency and voltage together. A variable frequency and voltage is created and applied to the motor. Changing the frequency and voltage can be done by the user, which can finally control the speed of the motor. By changing the frequency and voltage, the drive keeps the current and starting torque of the motor constant, so it is suitable for starting all motors with different light and heavy loads.