Energy Saving VSD\VFD\Inverter Air Compressor with Pressure Control

We create high end Three-coil Motor Energy Saving Air Compressors, Variable Frequency Screw Air Compressor 8bar, Heavy Screw Air Compressor and services based on high-quality talents and advanced technology. In order to increase staff communication and cultivate team spirit, our company often organizes various activities to active the spare time of everyone. We focus on the needs of our users and continue to innovate and make our products easy to use.

1. The permanent magnet motor remains high efficiency at low speeds.

2. Equipped with intelligent micro computer system.

3. Compared with the fixed speed compressor, energy saving 22%-40%.

4. Adopt high efficiency cooling system.

5. The larger system volume fluctuations, the more obvious energy-saving effect.

Energy-saving principle of air compressor soft start

Air compressor soft start is divided into two types: one is to start with variable frequency constant torque and current limit; the other is to start with thyristor voltage regulation, also known as intelligent soft start.

1. Comparison of two types of soft start

①Technical performance. It adopts variable frequency speed regulation to start, which has good static and dynamic performance when starting. Even at low speed, the motor torque can be adjusted at will, and the motor can be started with constant torque. The starting current can be limited to the rated current below the rated current. Intelligent Soft start, because the torque is reduced according to the second power of the voltage ratio when starting, the starting torque is very small, the soft starter has current feedback, and constant current starting can also be used, that is, keeping the starting current constant during the starting process , Until the motor is close to the synchronous speed. In terms of technical performance, variable frequency speed regulation start is suitable for loads with larger starting torque, which are generally larger than occasions, such as reciprocating air compressors, centrifugal separators, loaded conveyors, crushers, screw types or Rotary air compressors, centrifugal fans, centrifugal pumps, no-load starting conveyors and various no-load starting equipment. compressor low pressure

②Economical, the investment cost of using frequency converter to adjust speed is twice or even three times higher than that of intelligent soft start.

Based on the above technical performance and economy, the starting method that can be actually promoted by industrial and mining enterprises is the latter.

2. Smart soft starter

The intelligent soft start is mainly composed of a voltage regulating circuit composed of three pairs of anti-parallel thyristors connected in series between the power supply and the controlled motor. The microprocessor is the control core. The whole start process is automatically carried out under the control of digital program software. The starter uses the electronic switching characteristics of three pairs of thyristors, and the microprocessor in the starter controls the trigger pulse to change the trigger delay angle. The trigger delay angle of the thyristor can change the conduction time of the thyristor. , So that z* finally changes the magnitude of the three-phase voltage added to the stator windings. The characteristic of asynchronous motor stator voltage regulation is that the motor torque is approximately proportional to the square of the stator voltage, and the current of the motor is proportional to the stator voltage. , The starting torque and initial current limit of the motor can be achieved through the control of the stator voltage. The motor stator voltage is controlled by the conduction angle of the thyristor, so different initial phase angles can achieve different terminal voltages to meet different load starting characteristics. During the start of the motor, the conduction angle of the thyristor gradually increases, and the output voltage of the thyristor also gradually increases. The motor accelerates from zero until the thyristor is fully turned on and the start is completed, thus realizing the stepless smooth start of the motor. The z* maximum value of the starting torque and starting current can be set according to the load condition. compressor low pressure

Basic characteristics of intelligent soft starter

1) Adopting microprocessor full digital self-control monitoring, the starting current rises steadily with a constant slope when starting, there is no impulse current to the grid, and no large voltage drop is caused, ensuring the stability of the grid voltage, starting torque, current, voltage , Time can be set according to different loads, can obtain z*best current impact and z*best torque control characteristics, which greatly reduces the impact of motor torque on the load, and also meets the starting torque of different work objects Different requirements to protect the driven mechanism.

2) The motor start is not affected by the fluctuation of the grid voltage. Due to the introduction of current feedback in the phase shift circuit of the thyristor, the motor maintains a constant current and starts smoothly during the starting process. At the same time, because the starting current is set as the fixed value, when the grid voltage fluctuates, the control circuit automatically increases or decreases the thyristor conduction angle to maintain the original set value, which can protect the constant starting current. Some soft starters also Using dual power isolation to ensure that the control part is not interfered by various strong currents.

3) According to the different working objects, the motor can choose a variety of start and stop methods, and different starting methods have different starting torques. Generally, the initial torque range of soft start of the motor is selected. From the initial torque, it can be started at the level of the starting torque according to user requirements. The stator voltage of the motor increases steplessly during the ramp acceleration time, and the acceleration ramp time is set by the user , The motor can stop freely and softly, the time of soft stop can be adjusted, and the characteristic of soft stop greatly prolongs the life of electrical contacts. compressor low pressure

4) Simple structure, light weight, no noise, small footprint, as a non-contact control, the service life of the soft starter is much longer than that of the traditional contactor. If used properly, it can be as long as several decades. Easy to install, operate and use. The smooth and gradual starting process of the soft starter can reduce the vibration and noise of the equipment, extend the life of the motor and the driven machinery, and improve the working environment of the workers.

5) Multiple protections such as overcurrent, overload and power failure can be selected to ensure the safety of equipment and motors. Soft start can provide fast fault diagnosis information for monitoring and protection of equipment, such as current limit, overload, phase failure, rotor lock, etc. The protection setting value can be specified by the user, and the protection performance is reliable. Some soft starters also have automatic phase sequence recognition. , Phase sequence protection function.

6) With standard RS-232C interface, with communication function. The intelligent soft starter transmits data through a standard interface, and can be integrated into a network to realize decentralized control and centralized management. Its all-digital setting and external control functions are greatly convenient for users, and the performance and price ratio are high. The intelligent soft starter has a friendly human-machine interface. It displays the operating voltage, operating current, maximum current when working, and displays the fault category when it is faulty. It has a convenient external control interface, with digital delay start control, soft stop control input, and start delay relay. Various functions such as output and fault relay output. compressor low pressure

We focus on the challenges and pressures that customers care about, and solve technical problems in the application of Energy Saving VSD\VFD\Inverter Air Compressor with Pressure Control for customers. We will continue to uphold the business philosophy of creating contributions that we have adhered to so far. In the process of working hand in hand with customers, suppliers, employees and many other stakeholders to develop business, we have a greater influence on society and shoulder the responsibility of making contributions to society.

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