Description
If you go to some old buildings and take the elevator, when PP220 3BSC690099R2 starts and stops, people often have a strong sense of impact and dizziness, which is very uncomfortable; If you take a new type of elevator, even a high-speed elevator, the passengers can hardly feel the vibration and impact when starting and stopping, and the comfort is greatly improved;
In the past, the air volume of the electric fan was adjusted and selected by the gear switch. There were high, medium and low gears. The air volume was from large to small, and the speed of the fan was from high to low; Now the new fan can realize stepless speed regulation, and there is no obvious gear for the air volume. The PP220 3BSC690099R2 can realize seamless switching from high speed to stop;
PicSource:NIO es8
If the 0-100km/h acceleration time of fuel vehicles is less than 6s, it is basically out of reach with ordinary people. PP220 3BSC690099R2 belongs to high-end luxury consumer products; The advent of all kinds of electric vehicles directly shortened this indicator to less than 5s, and the overall landing price was only hundreds of thousands or even hundreds of thousands, so that consumers can easily realize their dream of running faster.
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The above examples are within our reach. Although we may not be able to see the actual frequency converter, in fact, there are frequency converters or frequency conversion devices behind or inside these devices that are silently contributing to us.
Why do elevators that once made people feel uncomfortable now become very comfortable; Is it easy to get the feeling of pushing back that was hard to get in the past? This is actually due to the benefits and improvements brought by the application of frequency conversion technology.
PicSource:Thyssen-Krupp
Through the use of frequency converter, the elevator improves its acceleration curve when starting/stopping, making the car run more smoothly, so that people can get a more comfortable riding experience; The speed of the fan motor is adjusted with the help of a frequency converter to make its operation and speed change more smooth and smooth; The hybrid vehicle is equipped with a frequency conversion inverter to convert the DC power in the battery into AC power, and the drive motor and engine work at the same time to easily achieve the acceleration that previously required a super horsepower engine to achieve.
PicSource:Altivar | Schneider Electric
In the industrial field, the frequency converter with a huge base is serving all walks of life to improve people’s lives.
To put it simply, users use frequency converters mainly to solve these problems:
Production process needs
The frequency converter needs to help machines and equipment complete some of the most basic application functions in industrial production.
speed control
Due to the difference of production rhythm and product materials, the equipment needs to flexibly adjust the running speed of material delivery.
By adding a frequency converter on the power supply side of the material conveying motor, the speed of the material conveying motor can be adjusted at any time according to needs with the help of its variable frequency AC output, so as to achieve flexible adjustment of the material conveying speed.
As stated in “What is a frequency converter”:
n = 60 f(1-s )/ p
N is the motor speed (r/min);
F is the power frequency (Hz);
S is the slip rate;
P is the number of poles of motor winding;
The inverter can change the motor speed n by changing the output power frequency f.
Torque control
In some applications such as reeling and unwinding, it is necessary to accurately control the tension that the material bears. The conventional way is to use a tension controller (such as magnetic particle tension controller); Now more and more users begin to use frequency converter to control the tension.
PicSource:FR A800 | Mitsubishi Electric
The theoretical basis for inverter to control motor torque is mainly the following two formulas:
Motor power:
P = 1.732 * U * I * cos φ
P: Power (w);
U: Voltage (V);
1: Power supply current (A);
cos φ: Power factor, namely the cosine function of the angle of phase difference between voltage and current;
Motor torque:
T = P / n
T: Motor torque (Nm);
P: Motor power (w);
n: Motor speed (rad/s);
It is easy to see from the above two formulas that the motor output torque can be controlled by adjusting the motor power supply voltage, current and speed
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