With the continuous progress of industrial automation, inverters have also been widely used, energy conservation and environmental protection as the core of China's industrial economy, pointing out the direction for the sustainable development of China's industry, but also useful to promote the sustainable development of China's inverter industry, so that China's inverter profession continues to expand the market share of the industry, and with a strong development force has become an important base point for the development of China's industrial economy.
Frequency conversion and energy saving are mainly used in the occasions where it is necessary to change the speed of the communication motor, change the mechanical characteristics of the drive and then reach the requirements of the production process, and are more used in fans and pumps. When the motor can only run at an additional speed, its drive machinery can only run at a certain additional speed.
1. Speed regulation of ordinary motor:
By changing the input voltage and frequency of the three-phase asynchronous motor, its speed can be controlled. When the efficiency of the cooling fan decreases at low speed of ordinary motors, the temperature rise becomes larger, so the motor load should be reduced according to the frequency.
2. High-speed operation can be carried out:
Generally, the frequency of the power supply is 50Hz, which is fixed. The output frequency of the inverter can reach up to 650Hz (EH600A series). The EH600H series can reach a maximum output frequency of 1500Hz.
General-purpose motors cannot achieve high speed only by improving the frequency, and the mechanical strength must also be considered. When the carrier frequency of the inverter is high at high speed, the inverter must be degraded.
3. Soft start and soft stop:
The acceleration and deceleration time of the inverter can be set between 0.1 and 6500.0 seconds. When running, the inverter needs to set the appropriate acceleration and deceleration time.
4. Fast and accurate start and stop:
The starting current is small, and the motor heats up small. The capacity determines the acceleration and deceleration time, and the capacity level of the motor and inverter should be improved, and the proportional relationship between the acceleration and deceleration time and the load should be adjusted.
5. Forward rotation can be easily completed:
Since the steering switch is performed by the IGBT, the loss of the original contactor disappears, and reliable interlocking operation can be carried out. When used for lifts, it is necessary to use a motor with a hugging brake, and there should be a mechanical organization to maintain the steering when changing the steering.
6. Electric braking:
Because the mechanical energy can be converted into electrical energy in the inverter during deceleration, the motor will automatically brake. By applying DC braking to the motor at zero speed, the motor can be stopped quickly. The inverter has only 20% of the braking force. When it is necessary to increase the braking force, an external braking unit and braking resistor are required. Inverters with built-in braking units only need an external braking resistor.
7. Motor speed regulation in harsh environments:
Since three-phase asynchronous motors can be used, explosion-proof, submersible or special-shaped motors can be easily used. The explosion-proof motor should be matched with the inverter for explosion-proof test to determine. The general-purpose inverters produced by our company are not explosion-proof.
8. One inverter can regulate the speed of multiple motors:
The inverter can adjust the speed of multiple motors together. The additional current of the inverter should be greater than 1.1 times of the total current of the motor. At the same frequency, the speed will be different due to the different characteristics and loads of the asynchronous motor. Together, each motor should be heated with an overload relay to maintain the motor.
9. The power supply capacity of the motor when starting does not have to be too large:
Unlike the power frequency power supply, which has a large starting current (5-6 times the additional motor of the motor), the maximum maximum motor current does not exceed 100-150% when the variable frequency power supply is started.
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