University of California, Irvine
EECS 160
Introduction
DC motor systems have a transfer function which governs the behavior of the motor. This
transfer function can be made into a bode plot to show the gain and phase behavior at different
frequencies. Bode plots therefore display important aspects of the transfer function, including
poles, zeros, gain margin and phase mar
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Introduction
DC motor systems have a transfer function which governs the behavior of the motor. This
transfer function can be made into a bode plot to show the gain and phase behavior at different
frequencies. Bode plots therefore display important aspects of the transfer function, including
poles, zeros, gain margin and phase margin.
The objective of this lab was to identify the bode plot parameters of an unknown circuit and to
define its transfer function. A circuit on a DC motor controller was set up by the TA. We tested
this system by inputting different pulse voltages, at 200 mV, 300 mV, 1 V, and 10V, and using
various sinusoidal frequencies. The output voltage was measured and compared to the input
pulse. The resulting calculations were given by the oscilloscope, and defined the phase (deg)
and gain (dB). The transfer function of this lab will follow the format of:
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