Hi Members,
I have a pool pump application where I would like to vary the speed of the motor. This is a highly marketable application with accent on power saving. "Save our planet" Eco system.
Pool (centrifugal pumps) are usually driven by 2 pole PSC motors.
(Permanent Split Capacitor).
A dual wound type motor with one main and one auxiliary winding.
The application is "Variable torque" RPM X HP is not a linear relationship.
Double the RPM requires eight times the original horsepower.
Reducing the RPM is in the opposite direction.
Half the speed requires 0.125 times the original horsepower.
Speed change effects: Flow is directly proportional.
Pressure is to the square of the difference in speed.
The pool pump application therefore only needs about 100 RPM reduction in speed to drop load from 1500 watts out to about 600 watts out.
A VFD controller therefore requires only a small reduction in frequency for a pool pump application. It needs to be varied via a potentiometer.
My specific application is two horsepower (1500 watt) 2 pole (2900 RPM).
Power input: 240\1\50 to output 240\1\45-50 approxomately.
A VFD of this size would suit all pool pump motors below two horsepower.
(As long as they are PSC motors).
Where can I buy one? Dont suggest building one. I am too old for projects. TIA. Frank.
I have a pool pump application where I would like to vary the speed of the motor. This is a highly marketable application with accent on power saving. "Save our planet" Eco system.
Pool (centrifugal pumps) are usually driven by 2 pole PSC motors.
(Permanent Split Capacitor).
A dual wound type motor with one main and one auxiliary winding.
The application is "Variable torque" RPM X HP is not a linear relationship.
Double the RPM requires eight times the original horsepower.
Reducing the RPM is in the opposite direction.
Half the speed requires 0.125 times the original horsepower.
Speed change effects: Flow is directly proportional.
Pressure is to the square of the difference in speed.
The pool pump application therefore only needs about 100 RPM reduction in speed to drop load from 1500 watts out to about 600 watts out.
A VFD controller therefore requires only a small reduction in frequency for a pool pump application. It needs to be varied via a potentiometer.
My specific application is two horsepower (1500 watt) 2 pole (2900 RPM).
Power input: 240\1\50 to output 240\1\45-50 approxomately.
A VFD of this size would suit all pool pump motors below two horsepower.
(As long as they are PSC motors).
Where can I buy one? Dont suggest building one. I am too old for projects. TIA. Frank.