Robot Mechanisms and Mechanical Devices Illustrated - Profe Saul

Chapter 1 Motor and Motion Control Systems 65
Figure 1-52 Exploded view of a
rotary solenoid showing its principal
components.
continues until the balls have traveled to the deep ends of the races, completing
the conversion of linear to rotary motion.
This type of rotary solenoid has a steel case that surrounds and protects
the coil, and the coil is wound so that the maximum amount of copper
wire is located in the allowed space. The steel housing provides the
high permeability path and low residual flux needed for the efficient conversion
of electrical energy to mechanical motion.
Rotary solenoids can provide well over 100 lb-in. (115 kgf-cm) of
torque from a unit less than 2.25 in. (57 mm) long. Rotary solenoids are
Figure 1-53 Cutaway views of a
rotary solenoid de-energized (a)
and energized (b). When energized,
the solenoid armature pulls
in, causing the three ball bearings
to roll into the deeper ends of the
lateral slots on the faceplate,
translating linear to rotary
motion.