How to carry out the normal selection and capacity matching of the inverter - News - Global IC Trade Starts Here.

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Proper selection of an inverter is a challenge that many engineers and professionals face. It's not enough to just choose the inverter body based on its specifications — it's essential to ensure that the inverter is correctly matched to the system requirements. The following points provide a comprehensive guide to selecting the right inverter for different applications.

First, consider the load characteristics when choosing an inverter. Use the actual motor current as the primary basis for selection, rather than relying solely on the motor’s rated power. Keep in mind that inverters can introduce higher harmonics, which may reduce the motor’s power factor and efficiency.

If the inverter will be used with long cables, it's recommended to either increase the inverter size by one rating or install an output reactor at the inverter output to minimize voltage spikes and protect the motor.

When controlling multiple motors in parallel, ensure the total cable length from the inverter to each motor stays within the acceptable range. For special environments like high temperatures, high switching frequencies, or high altitudes, the inverter may need to be oversized due to derating effects.

For high-speed motors, select an inverter slightly larger than standard models. When using inverters with pole-changing motors, pay close attention to the inverter’s maximum rated current to avoid exceeding its capacity. Explosion-proof motors require the inverter to be placed outside hazardous areas since standard inverters are not explosion-proof.

When driving gear reduction motors, take into account the lubrication method of the rotating parts and avoid exceeding the maximum speed tolerance. For wound rotor asynchronous motors, there is a risk of overcurrent tripping due to ripple currents, so a slightly larger inverter is advisable.

Synchronous motors typically experience a 10%–20% reduction in output capacity when driven by an inverter compared to commercial power supply. For high-torque fluctuation loads like compressors or vibration machines, choose an inverter with a higher rated current than the peak load requires.

Roots blowers have high starting currents, so make sure the inverter has sufficient capacity. Always check the inverter’s protection level to ensure it matches the environmental conditions. Lastly, single-phase motors are generally not suitable for inverter control.

Ensuring the correct inverter selection and proper capacity matching is crucial for achieving a reliable and efficient variable frequency drive system. Choosing the right inverter type based on the load characteristics is key. Here are some general guidelines:

(1) Constant torque loads: These devices maintain a consistent torque across the speed range. A constant torque inverter with 150% overload capability for one minute is ideal.

(2) Square torque loads: Examples include centrifugal fans and water pumps, where torque is proportional to the square of the speed. These systems require inverters with limited overload capabilities, typically 110%–120% for one minute.

(3) Constant power loads: Common in machine tools and winding mechanisms, these loads have high torque at low speeds and lower torque at higher speeds. Inverters for such applications should be selected accordingly to match the specific power requirements.