Frequency conversion requirements for the pump
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1. Can two pumps with variable frequency drives be represented this way in the data sheet? 2. Do \"variable speed\" and \"variable frequency\" mean the same thing? 3. Must the inverter be installed in an inverter control cabinet? Is it best to use an inverter motor?
Speed variation can be achieved using a gearbox or frequency conversion. If variable frequency speed control is used, a variable frequency motor is required for the motor
First of all, you are talking about frequency conversion, not speed regulation – it’s a different concept. To achieve variable frequency speed control for the pump, you can add an inverter. An inverter is an electrical device whose size is determined by its power rating; therefore, the appropriate inverter should be selected based on the power of the pump. The advantages of frequency converters are that they enable speed control, save energy, extend the lifespan of pumps, and reduce maintenance costs. Additionally, there is now a speed control device that is more energy-efficient than frequency converters – the permanent magnet variable frequency drive. Its advantage is that it uses less energy compared to frequency converters, but its disadvantage is its high cost.
Generally, it is not cost-effective to use an inverter for motors below 50kw.
If variable frequency is to be used, a variable frequency motor is required