/sci/ - Science & Math

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Anonymous Tue Nov 8 12:09:18 2011 No.4015603 [Reply] [Original]

>Run my computer repair business
>Laptop brought in. Needs cooling fan replaced.
>Brushless DC
>Not available for purchase ANYWHERE
>Gonna have to repair this bitch that is pretty melted

>Time to learn about DC Brushless motors
>Open wikipedia. See this.

>Stator flux linkage is estimated by integrating the stator voltages. Torque is estimated as a cross product of estimated stator flux linkage vector and measured motor current vector. The estimated flux magnitude and torque are then compared with their reference values. If either the estimated flux or torque deviates from the reference more than allowed tolerance, the transistors of the variable frequency drive are turned off and on in such a way that the flux and torque will return in their tolerance bands as fast as possible. Thus direct torque control is one form of the hysteresis or bang-bang control.

>Music Starts: http://www.youtube.com/watch?v=PoXy-0JhbLA

>>	Anonymous Tue Nov 8 12:10:31 2011 No.4015609 Just buy a new one. Fuck.

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