TasV Posted October 5, 2013 Posted October 5, 2013 (edited) Has anyone had a chance to compare the new EV3 M motor to the PF M motor? If so how does it compare in terns of power and RPM? How does the size compare to the M PF Motor (I have an EV3 M motor on the way to play with). Edited October 5, 2013 by TasV Quote
Quarryman Posted October 5, 2013 Posted October 5, 2013 Well, I can't say anything about RPM or power since I have no means of measuring those, but when it comes to size the EV3 M motor is slightly bigger. It's 9 studs long (I think this is mainly from the RJ12 connector taking up a lot of space), 3 studs wide and mostly 3 studs tall. It does have two 3 studs long beams sticking out of the bottom making it 4 studs tall at those points. Quote
lukeandahalf Posted October 5, 2013 Posted October 5, 2013 Would love to see a picture comparison! Quote
Jim Posted October 5, 2013 Posted October 5, 2013 Not the best pictures, but better than nothing. Quote
Philo Posted October 5, 2013 Posted October 5, 2013 I have not yet put EV3 motors on my test bench... Anyway, some data has been published by LEGO: http://education.lego.com/en-us/lego-education-product-database/mindstorms-ev3/45503-m-motor http://powerfunctions.lego.com/en-us/ElementSpecs/Default.aspx#8883 ...and a comparison image: Quote
lukeandahalf Posted October 6, 2013 Posted October 6, 2013 Thanks both Jim and Philo, very interesting! Quote
TasV Posted October 6, 2013 Author Posted October 6, 2013 Thank Jim and Philo... you guys are legends! Is stall torque and maximum torque the same thing? My understanding of this is that the stall torque is the torque (force) when the rotation of the motor = zero. Is maximum torque the same thing or is it running torque? I think max. and stall are the same thing. Should the PF max torque units be Nmm instead of mNm? Isn't Nmm just Newton millimetres? If so... the EV3 motor has a stall torque of 12N/cm and the pF a max. torque of 40Nmm... which is 4N/cm??? yes??? So... it generates more torque than the PF M motor (which I would expect with fewer RPM too). Quote
Philo Posted October 6, 2013 Posted October 6, 2013 It's difficult to sort out things without detailed curves... but it seems that the 40mN.m at 300mA is an "operational limit", not the stalled torque. According to my measurements, stall torque of PF-M is around 11N.cm at a 850mA current (see image below). And btw, 1mN.m = 1milliNewton.meter = 1N.mm = 1Newton.millimeter = 0.1Newton.centimeter. EV3 M-motor should indeed have more torque, but maybe the core motor is less powerful? (from size I don't think so). Will see soon on my test bench! Quote
TasV Posted October 6, 2013 Author Posted October 6, 2013 Thank you, Philo. I look forward to seeing the results of your tests. Will you publish them here or on your website? Quote
Philo Posted October 6, 2013 Posted October 6, 2013 On my website, but I'll announce it here... Quote
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