Quote:
Originally Posted by NiHaoMike
Being able to run faster than 3600RPM allows the use of low pressure refrigerants that were previously impractical. My friend Brittany Benzaia has developed a centrifugal compressor with a switched reluctance motor that operates at over 100kRPMs, allowing the use of water as a refrigerant in air conditioning.
Synchronous motors are more common in inverter drives since they're easier to understand. But newer control algorithms have closed the gap somewhat. Another interesting part about the Shannon Liu quadrature drive is how it actually does some filtering and FFTs on the motor current to detect the actual rotor speed without a resolver, exploiting the pulsating torque characteristics of reciprocating and rotary compressors. I don't think that would work very well on a scroll...
Filtering is needed, but much less than you think. Take apart an old PC power supply and you'll see that the filter is quite small.
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Water as a refrigerant ? Bet that would chap the refrigerant / chemical companies ? They would need to figure out a way to get the EPA to ban it . Or , at least , heavily regulate it .
God bless
Wyr