Cousin of OSW (Open Sim Wheel)

Hello everyone. I plan to build a DD wheel base. I have a DC motor from aku cordless lawn mower. I don't know the exact motor specifications. I only know that it is 24V and 3850 rpm. Based on very similar models from the same manufacturer, I assume that the motor has about 900W. Which power supply do you recommend? I plan to buy a power supply from ebay 24V 30A 720W. I have an STM32 board and an OMRON E6B2 CWZ1X 1800 PR encoder. Are 1k ohm resistors acceptable for this encoder? Which resistors do you recommend?

Hi everyone, I'm new and sorry for my English. I just picked up the MY1020 motor and when rotating the shaft it does not turn smoothly, I feel jumping, if the steering wheel turns like this, it will be worse than the steering wheel on the gear wheels
Is my engine broken? Unfortunately, I do not have all the parts yet to check if the motor will work differently under voltage

Thank You for help
Best Regards

it will be fine when you power it up

Thank you for your response, I connected my1020 with bts7960 + arduino (without encoder) and nothing has changed. I also connected it to + 12v and it worked for 5 minutes but after turning it off, it still did not run smoothly I am sending a video where you can see "jumps"

I'm planning to use, the MY1020 1000W 48V motor, along with a motor driver that can apparently run at 100A. You have suggested to use a 12V PSU but may I know, how much wattage and amperage should I look for? Would a 12v 100a 1200w work?

Here is a link to the motor driver: https://www.ebay.co.uk/itm/100A-DC-motor-drive-Module-High-Power-motor-speed-Control-Dual-Channel-H-bridge/261605228016?_trkparms=ispr=1&hash=item3ce8e2fdf0:g:5~cAAOSwPe1UI38T&amdata=enc:AQAFAAACcBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkXKoKcbeZcOrOku%2BoOBl%2BS2i1OETflUuScKWn%2F6xDFVdZzanMRgMVxWci5g0o24%2FaknMYL9OuALtikpB7RjD3HwR2%2BQo44jG3UCsfm%2FvAsnOoj8LX6CVH7C2rPCU6n7Jp1TF6Rcse9dSugVclDVvTz%2FJYmsGM%2Fz3MhWQwVUuEz9%2BoUXHyFHaY26UvbXJ9TTRd16CZALjKHqYMIn8zU6BXBSC30D7iJwGX0xUQmqQdqgriQMU19knRzvIRQ6Zrw%2BldePKgx%2FBrXyIE2KaqZ1M5mBtLcaVdVn7iTyBFDaRfm5MmLv0ewj2uSJ%2B9hT0I6CnnwuG3P5wLIokRt0B7uN2bnH2yQgya1%2Bh7H92ur3JvtsLdHD3dl17X9kSl47h8jmHJWTAxn22X7vMXhf2qxOsIMcKK4NzvEoXqS%2FCFCTrguZF3mXXOxmRTziJg7SNI8NvkjxmW09yY7GBXzhHWyUCM4UsCk32xRJetpAwTl1cKBJLEiRj%2FRCLcIh%2FPBIAXQZc5bbnOrWFdZACE2qgSI7M%2FAcf9I5zIo%2Fr1UOaMBkzHvJ5KdaDMTd%2B9%2Fxj1Gf35oS%2BV9HbUkGNPqXxBuMYywyJcJ%2FizhaqDSxsjqHKHet1coofFiWL%2FaXXMlPQJUuX7aRKB6uTXfA1bVaV2FB6zr5LEPRglvdbhUDf5ih%2FIUsMrerWcEPFJuKfv99N41xftiwfHxSE90p7TjwpLgZ2DG5q7DZuAyIkp6cItRKQQL6kKx1sT%2BtgnRpKrBo480vcJkyuY6wdCvX768yCqif%2Bn5C86vA%3D%3D|cksum:261605228016efbdbf205ebd48d6913a303057c22ec3|ampidL_CLK|clp:2334524

what made you think it would turn smoothly when the power was off !

A lil update, would this PSU's work? The HP DPS-1200FB-1 A Server PSU:

It will work, but please read my old statement; 12 Volt might be too low to produce that current on a 48 V motor. It was some time ago, but I think I needed almost 11 volt to produce 80 A at stall with my 36 Volt motor.

I read through this thread, maybe I missed it, but could you just tell me the specs here instead?

Maybe you misunderstood my question, but if I were to use a 48v 1000w MY1020 with a 100a driver, what PSU would you recommend? I have tried to search for a 24v 100a psu but I am unable to find one, maybe I don't know the exact numbers, or maybe you have some listings or examples for me?

I didn't missunderstand you, it will work surely, but I cannot guarantee that you have use for all the 100 Amps. Because it is a 48 V motor, i guess that the max Amps will be about 60-70 A @ 12 V.

What will you recommend then?

As you stated by yourself, a 24 Volt PS would be better, but it will still work with a 12 V, but you probably aren't gonna get all the possible torque from the motor.

How many amps? The most I've seen is 40A in my area

Hope you'll reply to this, took 2 years of planning but I finally took a dive and bought the 48v 1kv MY1020 and a soldering iron. I have a few questions:

1. What wire/cable gauge should I get for this project, including the wires for the board along with the wires for the DC drivers and motor?

2. I read your reply again, maybe I misunderstood, but I suppose with your statement I should either get a 12v with 80 or below Amp PSU or 24V with around 80+ amps since I'll only be able to use 70A of the 12v PSU?
(Primarily asked this because I'm having trouble finding a 24v PSU with more than 40A in my area and wanted to know if the 100A 12v would be ample for my usage in the meantime)

3. Will running the system on a 12v 80A+ PSU get me at least 5nm?

4. Should I use 3 IBT-2's for the 12v 80+A PSU or is 2 of them enough?

5. Do you have a photo of a torque test of your system? A friend of mine is telling me not to trust you and that you're making a lot of speculations

I'd like to note that I've read through this thread so many times this week from page 1, it's killing me that I can't get any answers, maybe I missed something, I don't know why I chose to do this with no experience but I really hope you can help ;w;

First, I don't use the MY1020 anymore. It's replaced by a Hoverboard motor based build.
1. You need at least 5mm2 wires for the motor (I used 2 x 2.5mm2 for my MY1020)
2. Correct. You will get the most Amps/torque when the motor don't move (Stall). If you check the data for the motor, you might found the numbers. The torque is proportional to the current.
3. https://www.motiondynamics.com.au/images/detailed/2/1020_motoren.jpg
If you look at this table, you can see 21.3 Amps give you 2.8 Nm, that's 0,13145 Nm/A, so roughly, you will get 50 A x 0,13145 = 6,57 Nm @ 50 A.
4. I'm not sure of how much current you will get with a 12 V supply, but max 25 A/IBT-2 to be on the safe side.
5. I don't have any photos, and I don't need to prove anything to anyone... Just read the datasheet on the motor.

If you already have the motor, measure the winding resistance with an multimeter or make a VA circuit with the motor locked so it cannot rotate, then you can figure out everything. Because the motor will act like a dyno when it start to rotate, the current will be less with the rotation speed. That's why the current is "only" 21.3 A @ 3250 rpm with 48 VDC. That's also why we can use this kind of motor for ffb, because it's practical at "stall" all the time, and don't produce any back EMF that limits the current flow. (Stall = 0 rpm)

Regarding number 4, I may have made a mistake, but I bought a 100A 12V PSU because it was way cheaper from the lower amp-ed PSU's. Will it burn out the IBT-2's or can I control how much amps is being fed regardless of the PSU's specs?

I guess that you will not get more that maximum 60-70 A with 12 V. You can also limit the max output in the ffb software whatever you have plan to use. If you limit the output to 50%, the RMS voltage will not go over 6 Volt and will produce a current of 30-35 Amps I guess...

60-70A sounds good to me, since you said it'll be roughly 5-6nm. Thanks for the help!