TFF-140SH pmdc micro 12 V dc electric motor

DC motor,brush motors 
Camerablood-pressure meter

Series Excited DC Motor field winding and the rotor winding through the brush 
and the commutator between the phase in series, excitation current and the 
armature current is proportional to the stator flux with the increasing of 
excitation current, torque and power approximation axial current proportional 
to the square, with the torque or current speed increases rapidly declining.