Implement a speed controller model for DC motor drives
Electric Drives/Fundamental Drive Blocks
The Speed Controller (DC) block represents a PI speed regulator model for DC machines. The model is shown in the figure.
The controller outputs the armature current reference, in pu. This current reference is typically used by a current controller to obtain the electromagnetic torque needed to reach the desired speed.
The controller takes the speed reference and the rotor speed of the DC machine as inputs. The speed reference change rate follows the acceleration and deceleration ramps you define in order to avoid sudden reference changes that could cause armature over-current and destabilize the system. To avoid negative speeds, the speed reference has a lower limit of 0 rpm.
The speed measurement is filtered by a first-order low-pass filter. The current reference output is limited between symmetrical lower and upper limits that you define.
Specify the drive type to use:
Chopper based (default)
Specify the number of quadrants to use. The default value is
Base speed of the DC machine, in rpm, typically equivalent to
the nominal operating speed. The default value is
The maximum rate of change of the speed reference to maintain
the machine's currents within rated values. The default value is
Initial speed reference of the DC machine, in rpm. The default
The PI controller's proportional gain. The default value is
The PI controller's integral gain. The default value is
The maximum magnitude of the output current reference, in per-unit.
The default value is
The speed measurement first-order filter cutoff frequency, in
hertz. The default value is
The speed controller sampling time, in seconds. The sampling
time must be a multiple of the simulation time step. The default value
The time step used for the simulation, in seconds. The default
The speed of the machine, in rpm.
The speed reference of the machine, in rpm.
Speed error (difference between the speed reference ramp and the actual speed).
Armature current reference, in per-unit.
The Speed Controller (DC) block is used in the DC1, DC2, DC3, DC4, DC5, DC6, and DC7 blocks of the Electric Drives library.
 Bose, B. K. Modern Power Electronics and AC Drives, NJ: Prentice-Hall, 2002.
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