1. The speed regulation power is high, which is an efficient speed regulation method. This is because after the frequency change, the motor is still working in close proximity to the synchronous speed, and the rated slip is fundamentally adhered to. It's just that in the frequency conversion equipment system, there will be conversion loss, and because of the influence of higher harmonics, the loss of the motor increases, and then the power decreases.
2. The speed regulation scale is wide, generally up to 20:1, and has a high speed regulation power in the entire speed regulation scale. Therefore, frequency conversion speed regulation is suitable for occasions with a wide scale of speed regulation and often working under low load.
3. The mechanical characteristics are hard, and the speed change rate is less than 5% when there is no automatic control; When the automatic control is selected, it can do high-precision work, and the speed shake rate can be controlled at about 0.5%|——1%.
4. In case of failure of the frequency conversion equipment, it can withdraw from the work and be directly supplied by the power grid, and the pump or fan can still continue to work.
5. It can be used as a starting equipment, that is, the motor is started to a certain speed through the frequency conversion power supply, and then the frequency conversion power supply is disconnected, and the motor can be directly connected to the power frequency power supply to accelerate the pump or fan to full speed.
When switching from variable frequency power supply to power frequency power supply, there is generally an impulse current, the grid voltage drops instantaneously, and the motor is subjected to mechanical shock. In order to prevent this phenomenon, a reactor can be connected in parallel between the motor and the power frequency power supply, so that the generation of impulse current can be pressed when starting. If the prime mover is a synchronous motor, it is necessary to perform "synchronous switching".
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