Torque constant and back-EMF constant (Motors #4)

[@wanderfra42]

Thanks a lot for this high quality lesson, very clear and complete!

[@CadPixel-why-not2455]

understood torque. best explanation of torque

[@ShinodaKwok]

OMG! What a high quality video! Love it!

[@johncgibson4720]

Excellent. I am trying to find a propeller that extends my drone's flight time, and I see the motor manufacturer's torque data with different propellers and input current. From this video's understanding, I can see the percent of power wasted as heat and percent of power used by the propeller. So now I can find a propeller for my RPMs that is most efficient.

[@lyontypes]

good fresher and just in time for quiz 2:) i love the clarity of the concepts!

[@diegogallego9370]

Brilliant explanation! theory and practice.

[@adanner]

Thank you for subscribing to my channel. Keep watching and learning. Please do spread the word so others can learn too.

[@smiiks2691]

Amazing!

[@aliaatarek7106]

this playlist is what i dreamt of please make dc machines course in that same manner of combining practical and theoretical.

[@chereba7309]

Great explanation! Thanx!

[@backyardmachinist]

Thank you sharing this knowledge. You stated that the back EMF increases untol the motor reaches its operating speed (no load condition). What would the back EMF be if the motor were to be loaded?

[@outagas2008]

Do ke and kt have to be re-determined for a different voltage? I want to use a 12V motor at 8V. PS. Great videos!

[@VTeslaV]

For a permanent magnet DC motor or pmsm what is the back EMF/voltage measured in when calculating the Ke? Is it the Peak, Peak-Peak or RMS value of the voltage? Similar question for the Kt constant, when controlling a motor you normally set the Iq current vector. Can you calculate the Nm torque on the motor by multiplying this value with the Kt?

[@VTeslaV]

Why I'm asking is because I have a motor that states in the datasheet that it should be 6.2v(RMS)/kRPM so 6.2v rms per 1000RPM. I'm trying to calculate the maximum torque I can apply at 0 RPM when using an FOC motor controller. When using this controller the Iq current is way lower than the actual current going into the device. If I calculate the Ke from the 6.2vRMS/kRPM I get a Ke/Kt of 0.06. The internal resistance of the motor is only around 0.05 ohm, my powersupply is 42. This would result in a stall current of around 840A with a torque of 50Nm. The motor in question is only around 10x10cm big and will probably explode at this power consumption of 35280w. I'm also wondering if there is a maximum magnetic field/force you can pull a neodynium magnet inside a motor that will ultimately limit the motor in this situation.

[@xiaoping186]

哇哦

[@leizhao1387]

coooooool

[@MAZEMIND]

1st

[@nutnutnutnitnitnit2568]

2nd