I have to find the output power of an AC motor without using a torque sensor.
My idea was to find the voltage and current through the terminals of the motor and then find V*I to get the input power. Then divide that power by the angular velocity of the motor from the shaft encoder to get the torque.
But this method is wrong because there seems to be lot of losses such as heat losses that will reduce power output of the motor. Also, since it is an AC motor the phase keeps changing and my V-I measurement keeps fluctuating. So maybe i will have to use a rectifier, but wont that further reduce teh accuracy of my measurements??
I dont want to buy a torque sensor. Do you guys know how i can accurately measure the output torque of a motor without using a torque sensor??
Thanks in Advance. I will be forever greatful
My idea was to find the voltage and current through the terminals of the motor and then find V*I to get the input power. Then divide that power by the angular velocity of the motor from the shaft encoder to get the torque.
But this method is wrong because there seems to be lot of losses such as heat losses that will reduce power output of the motor. Also, since it is an AC motor the phase keeps changing and my V-I measurement keeps fluctuating. So maybe i will have to use a rectifier, but wont that further reduce teh accuracy of my measurements??
I dont want to buy a torque sensor. Do you guys know how i can accurately measure the output torque of a motor without using a torque sensor??
Thanks in Advance. I will be forever greatful