View Full Version : using harddisk motor for propller clock

02-24-2005, 08:30 PM
hi all
i recently dismattled my old HDD for its head driving motor.i dono what it is,imean servo or some thing else.it looks same as in the below picture(having 4 terminals).now i want to use this motor for my propeller clock(http://www.bobblick.com/techref/projects/propclock/propclock.html)
this motor shld run Continuously when ever power is switched on.so if any one know how to drive it.(a simple powering circuit)
pls help me

some links of propeller clock



02-26-2005, 01:37 AM
no replies :cry:

02-26-2005, 10:42 AM
hi friend ,
well have u thrown away the pcb that came with the hard-disk .this is because the motor is not a dc motor that u can attach to a battery and it will start running u need a control circuit for it its actually a type of stepper motor in which the windings r connected in star mode (assuming that it has 4 pins).so u definately need a controller to run it.

02-26-2005, 05:42 PM
no i did't.i have its pcb.i think if we sort some terminal bertween power and data line the motor will run.but i have no idea.how to do.
any one

02-27-2005, 04:24 AM
hey i hop this my help u:




02-27-2005, 10:08 PM
hi friend ,
there is one prob to remove the motor u would have removed the platters and the heads .if u connect the motor to the pcb and connect the pcb to 5 &12v power supplies the motor will spin for 10 sec and will stop this is becase th circuits r so designed the if the reading heads dont read any data from the platter they turn off the motor as a preventive measure. instead try making ur own t-bridges with mosfets and micro-conts then this will work or ask some body else as i dont know how else to sole this prob.

02-28-2005, 10:14 AM
if your really need to make a propeller clock,try using a normal DC brushless motor,the ones found in CPUs.

One of the links provided by you uses this kind of motor...
Its much lighter and quieter than a HDD motor.

03-01-2005, 06:12 PM
i agree.but why iam choosing HDD motor is bcz of its compact ness and smooth operation.it runs very smoothly.and can get 2500-3000 r.p.m easily.and fixing of the propeller board on HDD motor is very easy.

03-05-2005, 10:11 PM
what you have there is a brushless motor
you will need a brushless dc controller to make it work
you will find schematics here and software here:
http://rcgroups.com/forums/ on the DYI section

You might also wanna look at this:
for bether torque(Wye) or speed(Delta)

have fun

03-10-2005, 04:45 PM
recently i found a new propeller clock schematic.http://hot-streamer.com/hilo90mhz/electronics/prop_clock.htm.in this he is providing built in pulser circuit to drive disk driver motors.have a lookhttp://hot-streamer.com/hilo90mhz/electronics/prop_clock/schematic2.gif
can we seperate this circuit from rest to drive HDD motor.is it possible.if yes pls give a modified schematic