It will be effective to use simple half wave motor speed control with small universal  ac/dc motors. Two amps RMS is the maximum current capability. The control gives excellent torque characteristics to the motor because speed dependent feedback is provided, even at low rotation speeds. By closing switch S1, thus bypassing the SCR, we can achieve normal operation at maximum speed.

UNIVERSAL MOTOR SPEED CONTROL WITH LOAD DEPENDENT FEEDBACK FOR MIXER SEWING MACHINE ETC1 circuit schematic

[Circuit’s schematic diagram source:¬† seekic.com]