The precious metal commutation permits operation at low starting voltages because of inherent low contact resistance. The 24-mm-long motor has a black housing that facilitates optimum heat dissipation, an external 12-mm motor diameter, and a 1.5-mm-diameter motor shaft for high rotational stability. For a complete miniature dc-drive system, the motor can be combined with a gearhead and encoder. Planetary, spur, and zero-backlash gearheads come in 10 and 12-mm diameters with various reduction ratios for an output torque up to 300 mNm. Two-channel magnetic encoders provide precise speed control and direction of rotation, as well as driveshaft positioning.

MicroMo Electronics Inc., 14881 Evergreen Ave., Clearwater, FL 33762, (800) 807-9166, micromo.com