Why would you want to do that. If the coils are 75ohms and the drive voltage is 12 volts then the maximum current that can flow under steady state (DC) conditions is 12/75 = 0.16amps which is the rated current of the motor. Under pulse drive conditions the mean current will be (much) less due to the inductance of the windings and the fact that the on/off effect of the pulsed drive means the effective power (heating) is less.