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In the production process of the enterprise, the application of pumps and fan equipment is very extensive, and the power consumption of such equipment is very large, and its energy consumption accounts for a large proportion of the total energy consumption of the enterprise. At present, our country is deepening the reform of the market economy system and the market competition can already be described as "tragic". Therefore, in order to enhance its own competitiveness, enterprises must optimize their production technologies and techniques, and reduce energy consumption and energy consumption during the production process Production costs, improve product price competitiveness.
1 frequency changer function
In the realization of motor control equipment often used is the inverter, the device to achieve the motor control is to change the frequency of the power output. In the process of enterprise production, we must pursue better control of the motor, and to achieve better control of the entire motor, you must use the inverter, through the device to achieve AC motor overcurrent voltage protection, overload protection and frequency Speed, at the same time the overall system of energy utilization and efficiency of the inverter is also responsible for regulation.
2 different types of frequency converter
2.1 different switching mode under the inverter classification Â
Different switches, the type of inverter is also different, according to the switch classification, the inverter can be divided into four categories: First, SPWM control inverter; second, PAM control inverter; third, SVPWM control inverter; Fourth, PWM inverter. In these four different types of frequency converter, PAM control is a pulse amplitude modulation, which by changing the pulse width of the pulse column to achieve the waveform and the output value of the modulation, in order to achieve the variable frequency drive functions; and PAM control, PWM control is pulse width modulation control, that is, when adjusting the waveform and output, it can be used to change the pulse width of the way, in order to achieve the inverter frequency conversion function; on the basis of PWM, change the modulation pulse is the SPWM control , In order to achieve the sine wave output, you need to follow the law of sine, arranged in the appropriate pulse width to filter and output waveforms, often used in production to the tributary AC inverter; and SVPWM control is space vector pulse width modulation, PWM A method of technical modulation, PWM will be inserted into the three-phase stator windings of the motor to promote the production of rotating magnetic field in the stator, so as to drive the motor to rotate.
2.2 According to the working principle of the inverter classification Â
In accordance with the working principle of split, the inverter can be divided into three types: the first is vector control inverter, the second is V / f control inverter, the third is slip frequency control inverter. V / f control inverter can ensure the frequency and the output voltage is a positive correlation, so you can achieve the consistency of the motor flux, effectively avoiding the weak magnetic and magnetic saturation problems; the so-called slip speed control is in speed Adopting the method of changing the slip of induction motor, the speed determines the slip requirement, and the slip frequency control technology can improve the dynamic performance and static performance of the system to a certain extent. The most important feature of vector control inverter is the DC motor Speed ​​control, according to vector changes in the method of decomposition of stator winding current induction motor, DC motor can achieve the magnetic field current component.
3 fan, pump frequency energy-saving analysis of the working principle Â
Fan, pump frequency To achieve energy efficiency, there are two ways: one is soft-start energy saving, one is energy-saving inverter. The following specific introduction of these two energy-saving methods of energy-saving principle:
3.1 About soft start Energy saving
As the motor is Y / D start or start directly, the rated current of 4 to 7 times is the starting current, which will have a huge impact on the power supply grid and mechanical and electrical equipment, if the power supply capacity is very high, it will be activated Resulting in great damage, such as the valve and the baffle was the current and vibration damage, thereby shortening the life of the equipment and so on. After installing the inverter energy-saving device, the soft-start function of the inverter can automatically adjust the starting current at the beginning to zero, so that you do not have to worry about the current generated will exceed the rated current, to a certain extent, reduce the impact on the grid, played Extend the life of the valve and equipment, thus saving the cost associated with inverter maintenance.