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Need schematics for electronic speed controler for a 3 phase hard drive (HDD) motor. Answered

Hello. I have a problem. I've bought an old HDD for fun, if I can say so, it works, but I want to use the 3 phase motor for some applications, out of the HDD enclosure, so the question is how to start the motor?...I mean, I know that I need an electronic board to do that, so where I can find some schematics?...P.S. Don't ask me the brand name of HDD, cuz I don't know! Thnx and sorry for my bad english, I'm from Romania ;)

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steveastrouk

7 years ago

The thing is, you trade off reliability and simplicity in the motor, against more complicated driviers - in a hard drive, the driver is well integrated into the chips on board - a hard disk spins at one fixed speed.

You CAN do this by using PWM and three channels on an Arduino, you synthesise three, 120 Degree separated sine waves.

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Timofte Andrei

7 years ago

i'm sorry if i'm wrong...i'm not actually a pro...i was thinking that is a stepper cuz when i've turned the plate mounted on the motor it felt like impulses if you understand what i mean...So...the new question is...who know's where i can find schematics to make this motor working without built-in HDD controller :D tnx

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frollardTimofte Andrei

Answer 7 years ago

Again, you need a BRUSHLESS MOTOR controller. They are finely balanced and tuned to this type of motor and making one requires more knowledge than I can offer -- other than 'buy one, they're cheap".

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steveastrouk

7 years ago

Its not a stepper, its a three phase motor.

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frollardsteveastrouk

Answer 7 years ago

Indeed!
Someone on hackaday recently built one but it used pulsed instructions rather than sine-waveform and the motor was hard to control past a few hundred rpm since the timing is SO important.

Author: Tip: But an "electronic speed controller" for brushless motors. It will save you a headache.