Energy efficiency is one of the biggest reasons to consider permanent magnet VFD technology.
However, it is important to understand that energy savings are not determined by the motor alone.
The complete pumping system matters.
Pump efficiency, motor efficiency, operating point, pipe sizing, pressure setpoint, duty cycle, friction losses and control strategy all influence actual energy consumption.
A permanent magnet motor can provide high motor efficiency, while VFD control allows the pump to reduce speed when full capacity is unnecessary.
In many variable-demand applications, reducing pump speed can significantly reduce the power required by the pump.
This is one of the major advantages of variable-speed pumping.
For this reason, the correct pump selection should be based on the building's real hydraulic requirement rather than simply selecting a pump with a larger motor.
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