On test server
Harddisk hub motor
The heads
Coil + parking position bumper
The heads
Magnet with parking position 'thing'
Harddisk - heads and platters
The heads
The heads
The heads
I don't like what I see
Samsung SpinPoint - 2006/05/26
Harddisk - heads and platters
Max headroom - NOT
Time to say goodbye !
The remaining parts
A head
A head
A head
A head
A head
A head
The new board
Purple mockup of the new board
Harddisk - stuff thrown away
Optimized ISR runtime - 8th pulse
Optimized sampling-ISR runtime
Optimized ISR runtime - 1st pulse
1st optimization attempt - 8th pulse
1st optimization attempt - 1st pulse
1st optimization attempt
Starting values - 8th pulse
Starting values - 1st pulse
Starting values - overview
Fully interrupt driven soft-uart receiver
Fully interrupt driven soft-uart receiver
Fully interrupt driven soft-uart receiver on an AT…
"The last Hope"
Japan won
Japan won
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FIFA Women's World Cup 2011 - FAN-atics
Nipon flag
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In it went
Debugging avrdude - arduino.c
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Harddisk hub motor
It is indeed a BLDC motor. The coils are Y-wound.
The left pad goes to the center point N, the remaining are the 3 phases U,V,W. Single-coil-resistance is about 1.6 Ohm.
The disk's PCB contains a Hitachi HA13645 driver. Unfortunately I just can't find a datasheet for that.
From what I've read so far, driving these with back EMF detection on the un-driven coils could be quite difficult.
scholar.lib.vt.edu/theses/available/etd-09152003-171904/u...
www.atmel.com/dyn/general/tech_doc.asp?doc_id=10416
The left pad goes to the center point N, the remaining are the 3 phases U,V,W. Single-coil-resistance is about 1.6 Ohm.
The disk's PCB contains a Hitachi HA13645 driver. Unfortunately I just can't find a datasheet for that.
From what I've read so far, driving these with back EMF detection on the un-driven coils could be quite difficult.
scholar.lib.vt.edu/theses/available/etd-09152003-171904/u...
www.atmel.com/dyn/general/tech_doc.asp?doc_id=10416
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