i wanna make a underwater rov for a competition. I'm gonna use six brushless dc motors - 4 for horizontal, 2 for vertical. I'm not really sure which motor i should use and i dont know which specs are important to me for operating a rov underwater. What number of specs value can i use for my rov? What do you suggest? If you know a brushless dc motor for me to use, i wanna know it. The vehicle is probably gonna be around 3,5 kg. I hope you'll understand me.
Thank You Mike. The video queue that I generate, from requests, is typically 8-12 weeks long. I don't have the list in front of me, however, from what I remember it's set for a March 30th release.
Why is the output power equal to 22V X 60A - isn't that the input power? Where are the "Iron Losses" accounted for in your analysis? Don't those "Iron Losses" dominate and limit the real world output power available from of these types of motors (i.e. those with really low winding resistances)?
Hey G Mack. Thanks for the question. The final sum was brushed over very quickly. Total input power is approximately 1300w. You then subtract out the Iron and Copper Lost totaling about 150w. Working out power output over power input, gives you approximately the 88% I mention in the video considering copper and Iron losses.
Iron Losses include all items on the left side of the board. Frictional mechanical losses and Iron losses are both captured in the Io value of the motor constant as calculated at the bottom left of the white board.
@@RCexplained Sorry - I assumed that Io was "No load current" because that's the only thing that I've ever seen on motor data sheets! But, I've never seen complete specs, like this www.maxongroup.com/medias/sys_master/root/8841181200414/EN-208.pdf for any of these RC motors, have you? Can you please share or point to them?
Great explanation! I'm assuming that the no load current was measured at 22 V in this example, right?
i wanna make a underwater rov for a competition. I'm gonna use six brushless dc motors - 4 for horizontal, 2 for vertical. I'm not really sure which motor i should use and i dont know which specs are important to me for operating a rov underwater. What number of specs value can i use for my rov? What do you suggest? If you know a brushless dc motor for me to use, i wanna know it. The vehicle is probably gonna be around 3,5 kg. I hope you'll understand me.
THere's far too many unknowns to provide you with a motor selection. How many watts of power do you need per motor?
Awesome content!! Been watching your videos a lot lately. Werent you going to upload how to measure the resistance of one phase of a motor?
Thank You Mike. The video queue that I generate, from requests, is typically 8-12 weeks long. I don't have the list in front of me, however, from what I remember it's set for a March 30th release.
Is Rm phase resistance or Line resistance?
Also I didn't find any explanation for standard 3-phase brushless motors!
Why is the output power equal to 22V X 60A - isn't that the input power? Where are the "Iron Losses" accounted for in your analysis? Don't those "Iron Losses" dominate and limit the real world output power available from of these types of motors (i.e. those with really low winding resistances)?
Hey G Mack. Thanks for the question. The final sum was brushed over very quickly. Total input power is approximately 1300w. You then subtract out the Iron and Copper Lost totaling about 150w. Working out power output over power input, gives you approximately the 88% I mention in the video considering copper and Iron losses.
@@RCexplained Thanks, but I thought the 150W was the sum of the copper and friction losses. I didn't see any additional iron losses.
Iron Losses include all items on the left side of the board.
Frictional mechanical losses and Iron losses are both captured in the Io value of the motor constant as calculated at the bottom left of the white board.
@@RCexplained Sorry - I assumed that Io was "No load current" because that's the only thing that I've ever seen on motor data sheets! But, I've never seen complete specs, like this www.maxongroup.com/medias/sys_master/root/8841181200414/EN-208.pdf for any of these RC motors, have you? Can you please share or point to them?
Io is no load current and what is required to calculate Iron Losses as well as frictional losses.