Pittman brand 22-mm brush-commutated DC gearmotors integrate
planetary gearboxes to meet demanding speed and torque requirements in
applications with tight design envelopes. They ideally suit devices for the medical
and biotech industries, among others, where DC gearmotors must be relatively
small and highly powerful.
These 22-mm DC gearmotors (Series 6000) are available in
three standard motor lengths: 1.256 in./31.90 mm, 1.556 in./39.52 mm, and 1.901
in./48.29 mm. Sturdy gearbox construction incorporates either metal gearing to
promote high torque capacity or economical plastic gearing to reduce audible
noise. Both gearbox versions offer the capability of bi-directional rotation.
Depending on type, the gearboxes range in length from 0.768
in./19.5 mm to 2.02 in./51.3 mm, weigh from 2.9 oz/81 g to 3.7 oz/106 g, and
can deliver reduction ratios from 4:1 to 429:1. Maximum load capabilities range
from 7 oz-in./0.05 Nm to 99 oz-in./0.7 Nm and continuous torque up to 0.7 Nm
can be achieved. Continuous load torque capability will vary with gear ratio,
motor selection, and operating conditions.
Key gearmotor features include skewed five-slot armature design,
bonded neodymium magnets, two-pole stators, heavy-gauge steel housing, silicon
steel laminations, and copper graphite brushes. Options include ball bearings,
EMI/RFI filter networks, leadwire or terminal connection configurations, and
optical encoders. The gearboxes can be specified in various mounting and shaft
configurations; output ball bearings can be added for high radial loads; and
additional reduction ratios can be developed.