Is there a way to reduce a motor's RPM while increasing Horsepower?

Question

Is there a way to reduce a motor's RPM while increasing Horsepower?

Answer 1

The popular VFD (variable frequency drive) does exactly this. Allows you to control the torque at different speeds by varying the frequency to the AC motor.

The Torque is dependent on the load on the motor and therefore the current to the motor from the VFD.

The VFD is available in either single phase or 3 phase power circuits.

Answer 2

Horsepower is just another name for  (kilowattage * 1.32)  and the **only** way to increase it is to replace the motor.

If you just want more *torque* and fewer RPM, try a reduction gearbox.

Answer 3

Please understand the concept of power and torque :

Torque * RPM * constant = hp

lbf-ft *rev/min * X = 1 hp    

X = 1 / (60 * 87.5) = 1/5250

Torque * RPM * 1/5250 = hp

hp = (Torque * RPM) / 5250

*Actually what is the purpose?

Do you want to increase hp and reduce RPM simultaneously / seperately?

-Depending upon the application,varius methodes can be employed.

1.Reduction of speed:

-Variator

-gear train/gear reducer/belt-pulley system/

chain-sprocket system

-Variable frequency drive.

2.It is obvious that for incresing the horsepower , you have to change the motor.

*My experience with pumps:

while operating the pump at a speed of 2900 rpm,suction was getting starved and failure of seal leakage are the result.

By employing belt pulley system ,pump rpm were reduced to 2600 using affinity laws and we were able to get rid of the problem.

Here, the motor rpm was same,i.e.2900.,but the purpose was solved.

-So, its a matter of application.It could have been better if you have put your purpose in the question.

Answer 4

You can reduce RPM by attaching a taller gear.

Answer 5

While gearing can increase torque while reducing speed, power stays pretty much the same, minus some, usually small, losses in the gearing.

To increase horsepower you probably need a bigger motor.