#robotics Logs

Mar 27 2020

07:48 PM DaRock: hey guys
07:54 PM DaRock: I'm trying to solve a problem regarding motors - new to this as I need to design everything from scratch this time
07:54 PM DaRock: I'm looking at the specs on the data sheet, and the figures I'm calculating don't add up, and I can't find an answer via google - or at least maybe I'm looking for the wrong thing
08:17 PM rue_mohr: k
08:17 PM rue_mohr: give me some numbers
08:18 PM DaRock: which ones do you want?
08:19 PM DaRock: Torque constant is 0.0610
08:19 PM DaRock: (no units mentioned btw)
08:19 PM DaRock: motor constant 0.1305
08:19 PM DaRock: torque is in kg-cm (yeah pooh!)
08:20 PM DaRock: I'm looking for ~200mNm torque, so around ~2kg-cm on this graph
08:21 PM DaRock: speed I need is around 2200rpm - so ~230 rad/s
08:22 PM DaRock: rated voltage i 12v, rated power 126W - max 230W
08:23 PM DaRock: no load is 18800rpm
08:23 PM DaRock: no load current is 2.4A
08:24 PM DaRock: stall torque is 4.79kg-cm
08:25 PM DaRock: sorry - what am I doing? The data sheet is here: https://www.jaycar.com.au/medias/sys_master/images/images/9363124944926/YM2774-dataSheetMain.pdf
08:35 PM DaRock: I'm calculating W as around 45-47W using the speed x torque equation
08:35 PM DaRock: which gives me current at around 5A
08:36 PM DaRock: but the sheet shows 36A @ 200mNm