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  • LittleHairyApe commented on Chris Project's instructable DC Motor Speed Controller3 months ago
    DC Motor Speed Controller

    Oh for goodness sake! This thread is done. I stand by my original answer even more than I initially did.

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  • LittleHairyApe commented on Chris Project's instructable DC Motor Speed Controller3 months ago
    DC Motor Speed Controller

    Actually the datasheet is quite adequate for its intended usage as a design tool. It is not a substitute for competent design, SPICE-type simulation, and nuts and bolts physical prototyping. I would respectfully suggest to you that the reason you may have had trouble in the past with your mosfets is not the mosfet's fault. It might be, because mosfets are not generally intended to be operated in linear mode. Mosfets and igbt's are primarily intended to be operated in switch mode. Basically there is no reason, imhto, to operate a power switching device in its linear region any more except technical naivete or laziness. Pulse width modulation in switch mode is the accepted alternative. But if you don't agree, I would be happy to discuss design specifics outside of this comment section. We...see more »Actually the datasheet is quite adequate for its intended usage as a design tool. It is not a substitute for competent design, SPICE-type simulation, and nuts and bolts physical prototyping. I would respectfully suggest to you that the reason you may have had trouble in the past with your mosfets is not the mosfet's fault. It might be, because mosfets are not generally intended to be operated in linear mode. Mosfets and igbt's are primarily intended to be operated in switch mode. Basically there is no reason, imhto, to operate a power switching device in its linear region any more except technical naivete or laziness. Pulse width modulation in switch mode is the accepted alternative. But if you don't agree, I would be happy to discuss design specifics outside of this comment section. We are getting a bit off topic.

    If you read the question carefully, it asks if this setup will work with a 12 v motor. Yes it will work with a twelve volt motor. It's not complicated. Its a 55v, 110a mosfet controlling a nine volt battery. Typically nine volt batteries can't supply 110a for very long, so barring the improbably ridiculous, and assuming it is properly snubbed for higher currents, it will work albeit inefficiently. Also I'm not the op.

    This circuit is a far from an optimal solution. This circuit is more suitable as mosfet test fixture (with modifications like adding a snubber) than as a real world motor controller. May I ask what your intended application is, what your motor's specs are, and those sorts of nitty-gritty details?

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  • LittleHairyApe commented on Chris Project's instructable DC Motor Speed Controller3 months ago
    DC Motor Speed Controller

    True. :D

    Yes.http://www.irf.com/product-info/datasheets/data/irf3205.pdf

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