hey....i am in need of a circuit(external) to run the spindle motor of an old hard drive using a battery.please suggest me a circuit
hey....i am in need of a circuit(external) to run the spindle motor of an old hard drive using a battery.please suggest me a circuit
i actually want the motor for one of my projects & it is necessery that i run with a battery using a controller circuit.so plese suggest a circuit.
i tried tracing the leads of the motor,but the circuit is multilayered and i could'nt trace the leads to the control IC as the leads are inbetween the two outer layers and not visible clearly.I think hard drive motors are BLDC's nowadays (Brushless DC motors) - they're actually run by 3-phase power.
See if you can read the part numbers from IC's near the motor connector. The motor connection harness will probably look like a ribbon with 4 wires/traces in it.
the HDD i have has a four lead stepper.I also found it is a star connection.I don't know what kind of hard drives everybody uses, but most of them nowadays are 3 wire, and they can not just be connected to power, the control IC is a 100 Pin QFP....
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the HDD i have has a four lead stepper.I also found it is a star connection.
i was actually trying to build a hovercraft as the motor had very high rpm and very light & generates less heat.i got 2 batteries of an old toy aeroplane.together it gives 14.4V,which I thought could be decresed to 12V and used.Wow, so your hard drive IS old.... last time I seen a 4 wire one was back in 2000/2001!
I went through my Hard drive archives and did find a 4 wire one from 2001
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.... but it will still require custom circuitry to control the motor, if you are going to be powering this off of batteries, I would suggest looking for an alternative to use.... If you could explain what it is you are trying to do, maybe someone can have a better understanding of your needs....
even i searched for this IC on google and it has to be ordered in bulk starting from 300$.These motors are sensorless brushless motors. They are either delta connected (3-wire) or star connected (4-wire)
What you need is an IC like the TDA5140A
http://www.nxp.com/documents/data_sheet/TDA5140A.pdf
Not sure where you will get one of these. Try Google.
Alternatively, it is possible to design your own using a microcontroller and drivers. Not an easy project though.
I have attached an interesting document from Microchip.