Thank you for the response once again guys.
The reason I ask about the V/Hz ratio is the following: As you decrease the Hz (and consequently voltage) the power the motor can supply decreases as per
P=SQRT(3)*I*V*eff*PF.
If P decreases as RPM decreases, this is how you obtain the constant...
Hello!
Thank you for your help. "Torque control mode" is what I am referring to.
Without going into too much detail: A mass is being hauled by a cable hooked up to a "main winch". This is not what I am designing however. My design is for another winch, which provides a constant back tension...
Thank you LionelHutz!
The motor is from WEG, they publish the motor curve. I found a motor that was rated above 5 Nm. It's a 1.1 kW motor (4 pole) with a rated speed = 1735 RPM and a rated torque = 6.4 Nm.
Your help has been great, but the main trouble I am now having is not the motor...
Hello,
So attached I have a photo of a tentative motor (0.37 kW, 4 pole, 3 phase, rated speed = 1705 RPM, rated torque = 2.07 Nm). I also have my load. I aim to use a VFD, as my load Is over a range of speeds. Using a V/Hz ratio of 7.67 I have worked out that my rated motor torque will stick at...
