Power frequency direct air compressor
J-55AG
Quantity
The motor directly drives the compressor, causing the crankshaft to rotate, driving the The Working principle of power frequency and frequency conversion:
I. Power frequency startup: star delta startup mode, starting with 5-8 times of rated current, has a great impact on the power grid, which is easy to cause instability of the power grid and threaten the operation safety of other electrical equipment, and causes abnormalities.
2、 Variable frequency starting: it can be started smoothly through the controller or PID regulator inside the frequency converter.
Advantages of power frequency and frequency conversion:
1、 Variable frequency starting with stable air pressure
As the variable frequency screw air compressor utilizes the stepless speed regulation characteristics of the frequency converter, it can be started smoothly through the controller or the PID regulator inside the frequency converter; When the gas consumption fluctuates greatly, the reaction can be quickly adjusted. Compared with the upper and lower limit switch control of power frequency operation, the air pressure stability is doubled.
2、 Variable frequency startup will not affect startup
1. Since the frequency converter itself contains the function of soft starter, the starting current is within 1.2 times of the rated current, and the starting impact is very small compared with the power frequency starting with more than 6 times of the rated current.
2. This kind of impact will greatly reduce not only the power grid, but also the entire mechanical system.
3、 Variable frequency starting variable flow control
The air compressor driven by power frequency can only work at a fixed displacement, while the variable frequency air compressor can work in a wide range of displacement. The frequency converter adjusts the motor speed according to the actual air consumption and controls the air displacement. And when the air consumption is low, the air compressor can automatically sleep, which greatly reduces the energy consumption.
4、 Variable frequency starting can improve the voltage adaptability of AC power supply
1. The frequency converter adopts the over modulation technology, which can make enough drive motors work when the AC power supply voltage is slightly low; When the voltage is slightly higher, the voltage output to the motor will not be higher.
2. For the occasion with its own power, variable frequency drive can show its advantages.
3. According to the characteristics of the motor (the variable frequency air compressor works below the rated voltage under the energy-saving state), the effect is obvious for places with low voltage.
5、 Lower noise in frequency conversion starting
Most working conditions of variable frequency startup are lower than the rated speed, reducing the mechanical noise and wear of the host, and extending the service life of maintenance and use.
6、 Power frequency startup is more constant
Because the air compressor driven by power frequency can only work at a fixed displacement, it will always maintain a stable working state, so it will be more stable as a whole.
7、 Power frequency startup is better than power
Generally, manufacturers who make energy-saving transformation will choose power frequency, so the specific power is clear at a glance.
The above are the differences and advantages between frequency conversion and power frequency. If the daily working time is long, it is recommended to purchase an air compressor started by frequency conversion, a permanent magnet plus a frequency conversion regulating machine, which is conducive to energy conservation. If the daily working time is short and the gas consumption time is short, it is recommended to select power frequency startup for more stability.
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I. Power frequency startup: star delta startup mode, starting with 5-8 times of rated current, has a great impact on the power grid, which is easy to cause instability of the power grid and threaten the operation safety of other electrical equipment, and causes abnormalities.
2、 Variable frequency starting: it can be started smoothly through the controller or PID regulator inside the frequency converter.
Advantages of power frequency and frequency conversion:
1、 Variable frequency starting with stable air pressure
As the variable frequency screw air compressor utilizes the stepless speed regulation characteristics of the frequency converter, it can be started smoothly through the controller or the PID regulator inside the frequency converter; When the gas consumption fluctuates greatly, the reaction can be quickly adjusted. Compared with the upper and lower limit switch control of power frequency operation, the air pressure stability is doubled.
2、 Variable frequency startup will not affect startup
1. Since the frequency converter itself contains the function of soft starter, the starting current is within 1.2 times of the rated current, and the starting impact is very small compared with the power frequency starting with more than 6 times of the rated current.
2. This kind of impact will greatly reduce not only the power grid, but also the entire mechanical system.
3、 Variable frequency starting variable flow control
The air compressor driven by power frequency can only work at a fixed displacement, while the variable frequency air compressor can work in a wide range of displacement. The frequency converter adjusts the motor speed according to the actual air consumption and controls the air displacement. And when the air consumption is low, the air compressor can automatically sleep, which greatly reduces the energy consumption.
4、 Variable frequency starting can improve the voltage adaptability of AC power supply
1. The frequency converter adopts the over modulation technology, which can make enough drive motors work when the AC power supply voltage is slightly low; When the voltage is slightly higher, the voltage output to the motor will not be higher.
2. For the occasion with its own power, variable frequency drive can show its advantages.
3. According to the characteristics of the motor (the variable frequency air compressor works below the rated voltage under the energy-saving state), the effect is obvious for places with low voltage.
5、 Lower noise in frequency conversion starting
Most working conditions of variable frequency startup are lower than the rated speed, reducing the mechanical noise and wear of the host, and extending the service life of maintenance and use.
6、 Power frequency startup is more constant
Because the air compressor driven by power frequency can only work at a fixed displacement, it will always maintain a stable working state, so it will be more stable as a whole.
7、 Power frequency startup is better than power
Generally, manufacturers who make energy-saving transformation will choose power frequency, so the specific power is clear at a glance.
The above are the differences and advantages between frequency conversion and power frequency. If the daily working time is long, it is recommended to purchase an air compressor started by frequency conversion, a permanent magnet plus a frequency conversion regulating machine, which is conducive to energy conservation. If the daily working time is short and the gas consumption time is short, it is recommended to select power frequency startup for more stability.
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