DC Parallel Shaft Gearmotors are used with zinc die-castings. It includes porous bronze sleeve on gear case ball bearings on motor. It has phenolic high speed and hardened steel gears.
Permanent magnet field dc rotary motors have proven to be reliable drives for motion control applications where high efficiency, high starting torque, and linear speed-torque curves are desirable characteristics. A stator coil that generates magnetic flux constitutes the permanent-magnet dc servomotor; this generator is always a permanent magnet made by ferromagnetic ceramics or rare earths. An armature that includes the current carrying winding that surrounds a rotary ferromagnetic core. A commutator that provides an electric connections by means of brushes between the rotating armature winding and the external feed winding, according to a commutation logic determined by the rotor motion. It is typically a dc-to-dc converter, whereas for a brushless dc servomotor it is typically a dc-to-ac converter, whose frequency is dictated by the angular velocity of the rotor.