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Mike,
The 3:1 reduction is to multiply torque. If I had a motor that was low RPM high torque, then I would direct couple the motor to the compressor. However, I got this motor surplus for $50 and said to my self, "I can make this work." New this motor is like $1,000. If I were to source a special motor for direct drive it would be even more. So, you work with what you have.
Good comment on the speed. Paul, can we have overspeed sensor tie in on this controller?
Roger
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