This kind of motors come in different ratings and these are mostly used by beginners bcoz the ease with which u can control them , these can rotate in both direction when the power supply is interchanged
when u give + of power supply to one terminal the motor and - ve of power supply to other terminal of the motor the motor wuld rotate in one direction, when u revrse the terminals of power supply the motors rotate in different direction.
Generally this motor comes with a speed of 2400 1200 rpm which are used in taperecorders but then this wuld not give enough torque so we use gears to get speed varyinf from 10 rpm to 1000 rpm (as speed increases torque desrceses) .
I l talk more abt stepper motors once i start of with elcectronics parts
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