CD-ROM motor on steroids - testing 12kW DIY BLDC controller

[R0ckR2]

i would care for my fingers

[ganeshranjit]

hi.i tried to find a sercuit diagram to drive this motor but i couldnt.please can u give me your diagram please.

[zolberserk]

can I control a brush-less cd-rom motor using the voltage of a brushed cd-rom motor with some sort of using the voltage of the bushed motor as signal to the brush-less motor controller? and keep the same rpm as the brushed motor for the given voltage/signal. I want to convert a brushed motor cd-rom unit to brushless motor unit. the controller of the brush-less motor is integrated on the cdrom but I can't control it.

[astlin]

sweet. where to get circuit layout?

[TheInvertKid]

so is it better to have a disk spinning at 50mph or sumthing?

[circuitdotlt]

@TheInvertKid It's better than 13kg wheel spinning at 50mph in middle of living room.

[xmodalloy]

Can you possible send me a link of the instructions on how you made the controller? I could use something like this for controlling the hub motors on an Electric car, if I could bump the amperage up a tad, should be able to stack some FETs though.

Thanks!

[circuitdotlt]

@xmodalloy,

Unfortunately, no. I have not documented it, actually there is no schematic for it, everything is still in my head. I intend to use it with big hub motors and enormous RC motors, but it still needs a lot of work.

[xmodalloy]

@circuitdotlt Awesome brain if you can design a brushless ESC from nothing, I congratulate you.

Is it using any sensors, or is it detecting the back EMF?

[circuitdotlt]

@xmodalloy,

Thank you :)

Yes, it is using three hall effect sensors (industry standard), one per phase. I'm running it with Space Vector Pulse Width Modulation, so it is very hard to do with back-EMF, like in traditional way. It is possible to get phase timing from main current sensor, but hall effect sensors are more reliable.

By the way, hardware is nothing compared to software running on it. I'm still at ~30% in writing firmware for it.

[xmodalloy]

@circuitdotlt Well, it's pretty awesome that you can do it from scratch, I doubt I could design the circuit or write the firmware myself, I might hire you for a job over the internet next year when I build my real electric car from scratch, since I am going to need someone capable of helping me design the drive-train from scratch. I already have a overall design of the car and motors, but I have no idea how to go about building a powerful enough ESC for each of the four ~20KW hub motors.

[davidpaulin]

isn't that dangerous ?

[xoomas]

Nu nice :) bus mano next "project" ;)

[punchas19]

iskirpk dantukus ir kaip balgarke naudokis xDD