PIC16F84A HDD-Motor driver video2

	Duration: 00:54 minutes Upload Time: 2007-07-06 04:22:40 User: DataMatrix47 :::: Favorites :::: Top Videos of Day
Description: Second video for harddrive brushless motor. I'm still having speed contol issues :(
Comments
Ghalebi2 ::: Favorites  2007-07-17 18:52:29 i didnt get u, can anyone explain what the heck is going __________________________________________________
DataMatrix47 ::: Favorites  2007-07-19 10:42:44 I've taken a 3 coil motor from an old harddrive an i am trying to get it to work without hte electronics from the harddrive. Because it's a brushless motor, i have to turn on and off each coil to create a rotation. __________________________________________________
DataMatrix47 ::: Favorites  2007-07-19 10:43:03 It works by outputting sequence of bytes to the port. This is the pattern from the sequence: 011, 010, 110, 100, 101, 001 and allover again. The LEDs are connected with the coils, so that you can also see the pattern on the leds, but because of the high frequency of the pattern change you can't see anything else than a pretty blinking lights. __________________________________________________
DataMatrix47 ::: Favorites  2007-07-19 10:43:15 I have perfected the contoller program, so that the motor accelerates gradualy to a point, that the power from the PIC isn't enought for getting more speed. __________________________________________________
Ghalebi2 ::: Favorites  2007-07-19 16:26:53 does this circuit has a beinifit! i mean u can get a better results if u drove a stepper motor directly from the PIC. how long ur assembly code is? __________________________________________________
DataMatrix47 ::: Favorites  2007-07-20 14:56:01 The assembler code can bi printed on a standart A4 page with 12pt font. I've started this project, because another hobby of mine is modelism (toy RC planes) and as far as I've learned, brushes motors are pretty powerful, but they are also pretty expensive. So i had a motor from an old HDD, a PIC microcontroler and the knowledge to do it. The problem with the original electronics from the HDD is the board was too big and requires +5V and +12V supply, which you can't put on a light weight plane. __________________________________________________
aruanboggy ::: Favorites  2007-09-18 20:41:21 the motor that drive the plates of the hdd works on magnets right? i'm not really into this stuff. am i right? __________________________________________________
DataMatrix47 ::: Favorites  2007-09-19 05:08:36 Yes, your're right. The're fixed on the rotating part of the motor. __________________________________________________
aruanboggy ::: Favorites  2007-09-19 08:04:28 cool, thanx __________________________________________________
cresstt ::: Favorites  2007-10-11 08:38:39 how fast can the motor & pic combination can go ? whats you fet driver like ? __________________________________________________
DataMatrix47 ::: Favorites  2007-10-11 20:03:12 It's not very fast and lacks power, because the PIC gives out about 25miliAmpers and the motor should work on something more like a 0.5-1A. I've recently tried the concept again with a 3 pin brushless motor from a CD-Rom and a motor driver L293D. It's much faster and more powerful, but if it runs for more than 8sec. the driver heats up extremely and i shut it down at that point. Probably, the problem is that the driver gives to 1.2A but the CD motor requires 2-3A and my power unit is 0.5A. __________________________________________________
DataMatrix47 ::: Favorites  2007-10-11 20:03:23 If someone suceeds with this concept, please send me a message or response video, I'm very interested. __________________________________________________
Aitopes ::: Favorites  2007-11-05 17:46:59 Hello! Very interesting. You can try driving the motor with 3 mosfet... PD:Are you sure that this pattern (011, 010, 110, 100, 101, 001) is ok? Ariel. __________________________________________________
DataMatrix47 ::: Favorites  2007-11-06 16:22:46 The pattern is correct. The only problem, as I recently discovered is that the current is too low. If i had a 2A driver that would be a difrent story. My current driver(L293D) is incapable of driving the motor correctly and it heats to the extreme 65 degrees Celsius in a 10-20 seconds and I always turned it off before the smell of baked electronix :P :) __________________________________________________