I am planning to build a quadcopter, so I searched about motor drivers, then I thought "Do I really need a motor driver?", I mean the only thing I want to control is the motors' speeds, so won't MOSFET be enough for that?
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asked Jan 19, 2019 at 14:55
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1\$\begingroup\$ Yes, you really do need motor drivers. I recommend you look up just how the kinds of motors used in quadcopters work; they're usually three-phase permanent-magnet AC motors. \$\endgroup\$– HearthCommented Jan 19, 2019 at 14:57
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3\$\begingroup\$ For a start, how will you get velocity (RPM) feedback to your control system if you use a simple DC motor? \$\endgroup\$– TransistorCommented Jan 19, 2019 at 15:04
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1\$\begingroup\$ What happens if something blocks the rotor? \$\endgroup\$– HearthCommented Jan 19, 2019 at 15:28
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1\$\begingroup\$ How precisely can you control motor speed using just a MOSFET? How precisely do you need to control speed in order to maintain stable flight? Do every motor and every MOSFET have exactly the same characteristics? \$\endgroup\$– Elliot AldersonCommented Jan 19, 2019 at 15:36
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4\$\begingroup\$ Quadcopter motors are not controlled for a desired speed, rather the loop is closed around the behavior of the aircraft. Small ones using brushed motors do indeed use a single FET per motor PWM'd from the processor. Spend some time working with an open source firmware reflashed into a 20 gram toy before you think about doing anything fully original or larger. The wildly ignorant replies you are getting demonstrate why you should pursue experiential knowledge somewhere like rcgroups rather than guesses from first principles here. \$\endgroup\$– Chris StrattonCommented Jan 19, 2019 at 17:05
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