Brushless CD-ROM motor operated from MATLAB -- II

[VorVZakonie]

holly shit! i love this video !! it changed my life !!!

[yonathan90]

one + , one - , and one what?

[RamiroR]

I remember having one of these and finding it so frustrating the fact that I couldn't make it spin without equipment

[Haunted360]

Pretty good. Though, it would be better if you made MATLAB have a speed control. So you could run it at 24x, 16x etc...

[frogvillage]

try maple 7.0..it would run much faster....

[valiza123]

I tried this experiment. At this speed it takes 1.5 amps. As it reaches maximum speed (at that voltage) the current draw falls to 0.5 amps.

[XGCKrazyK]

this is the stupidest video on youtube

[christopherphaneuf]

@XGCKrazyK agreed.

[LBCFCSS]

@XGCKrazyK This video is not that stupid. Think of this. This video could give someone the idea to attach it onto a pair of roller blades inserting pressure detectors so if you lean forwards the motor spins and vice versa. This could lead onto new motor powered blades with increased speed. With developers seeing this done they might create more powerful motors making the go even faster. So now your at a running speed without doing anything but leaning forwards slightly.

[XGCKrazyK]

@LBCFCSS Their gonna use CD ROM drive motors for their roller blades? i think not. you would need something like a wheel chair motor that has a gearbox on it for the required torque to move someone on roller blades. All this video is, is a brush-less 3 phase dc motor spinning... big deal.. id rather watch paint dry, he doesn't explain how he used a three-phase inverter or anything. And as for the thing u lean forward an go forward its been made, its called a SEGWAY.

[cheetawolf]

are there any CD motors that are like a CPU fan woth integrated hall effect thingies so there are jsut 2 wires to connect to a battery?

[christopherphaneuf]

this is essentially the same as stepper motor operation, since it was running open loop, without the feedback of the hall effect sensors. the speed was determined by the frequency of the pulses. i wasn't trying to simulate its operation as a CD drive nor was i reinventing the brushless motor -- it was simply to demonstrate the fundamentals of the motor and to back up an idea i had regarding the motor's potential integration with a rotary valve.

[chamath1985]

Um it was rotating slow. How did you power it? How much voltage vs amperes? Plz reply.

[christopherphaneuf]

i don't recall the details of that setup since it was a one-day experiment as part of a 10 week internship in 2007. i used a PCI data acquisition device to send low-level digital signals (controlled by signal generators in MATLAB), with the proper relative phase alignment, to six transistors (for 3-phase inversion), providing the electrical commutation needed to operate a synchronous motor. the power supply connected to the inverter was likely at 9 or 12 volts.

[SVKmellow]

i also noticed that you have to have three signals controlling the motor but I have no idea what what signals I should send... maybe you could post your experience :) ?

[SVKmellow]

ok i tried it out... and it is definitely just the three contacts i mentioned. The voltmeter detects the same resistance and when i hooked it up it did move a bit, but I I don't know the sequence :( could you please post the sequence you used or redirect me to a website ?

[criticaboutvids]

sorry but what does brushless mean?

[speedstakerguy]

it means u dont have to eat pickled eggs every day

[criticaboutvids]

wow, thanks for making it a bad comment although i am just a curious little being, asking a simple question.

[jtdreisb]

a brushless motor does not contain brushes to send signals to switch the polarity of the coils. They do not wear out as fast but require more programming and knowledge of the motor because the coil polarity must be changed manually by the code sending signals to the device.

[JoelThedude4u]

you are wrong, I believe a DC motor is anything that runs on DC current, such as this motor. Its called a steeper motor, because it moves by steps. The selection of which fields to activate makes the motor move step byu step until rotation is achieved. A AC motor runs on AC voltage, whicn means the positive will change to negative and so on inverting the magentic fields. current goes both ways, in DC only one way.

[AZURA888]

This is brushless not a DC motor so you have to cennect it to a driver or a pulse generator to move it.

[themahen]

Can you Please Tell Me Where Did you Connect the 3 wires to?.I Tryed Connect To Wires With batteries.1 Wire to positive and 1 more to negative by this way the motor does not spin at all but it moves a bit then stop.Pls Tell My How u connect this wires ^-^