Torque characteristic of the DC motor
actual connection of the motor
Speed can be controlled by vary Va. We call it an amateur
control. it can also be done vary Vf we called in field control but due to the initially
slow response this is not taken for server control. We keep vs fixed.
Torque speed characteristic is almost vertical due
to large gradient( Km^2w/Ra ). so motor speed is almost constant irrespective
of indication ‘o’ near control speed motor (for a given Va)
at 100% Va get the maximum speed or the base speed
by lowering Va. we can set the speed smoothing at any value between base speed and zero.
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