O Desafio
Como equipamento elétrico central na produção industrial e no setor civil (ventilação de fábricas, tiragem de caldeiras, aeração de tratamento de esgoto, insuflação de ar-condicionado predial), ventiladores no modo de frequência fixa enfrentam “operação superdimensionada” (motor potente movendo ventilador levemente carregado), consumo excessivo de energia e dificuldade de regulação de velocidade. A solução combina o controle por inversor com as características da carga do ventilador (torque quadrático, potência proporcional ao cubo da velocidade), viabilizando operação eficiente, controle preciso de vazão e gestão inteligente; serve a retrofit e novas obras em metalurgia, química, tratamento de água e HVAC.
A Solução
With the core objectives of "energy conservation first, stability and reliability, and intelligent controllability", this solution conducts design from three aspects: hardware selection, system architecture, and control logic. The specific contents are as follows:
Hardware Selection: Matching Fan Load Characteristics
Inverters are selected based on the fan's rated power, rated voltage, and operating conditions (such as whether it involves shock loads and start-stop frequency). The core selection principles are as follows:
1.Inverter power selection: Considering the inrush current during fan startup (usually 1.5-2 times the rated current), the rated power of the inverter must be ≥ 1.1 times the rated power of the fan. If the fan is used in high-temperature and high-dust environments (such as mine ventilation and metallurgical sintering fans), an additional 10%-20% power margin must be reserved to prevent the inverter from overheating and overloading.
Example: For an 11kW three-phase asynchronous fan, a 15kW general-purpose inverter is recommended. If the ambient temperature is > 40°C, it is necessary to upgrade to an 18.5kW inverter and equip it with a matching cooling fan.
System Architecture: Two Modes (Single Unit and Cluster)