E (volts) = (d [magnetic-flux] / dt) * N So the EMF (E) = rate of change of magnetic flux with time, multiplied by the number of loops in the coil.
If you increase the strength of the magnets, you will find that the no-load speed of the motor decreases for a given supply voltage, but the torque increases for a given current. You could increase the voltage to get the original speed back, but if you do that then you should current-limit the motor driver so that you do not feed it more current than it would have if it were running from 6V.
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