# Build a permanent magnet dc servo motor driven by a full-bridge

Consider a permanent magnet dc servo motor with the following parameters:

Tem(rated) = 10Nm

Rated Speed in rpm Nrpm = 3700

kT = 0.5Nm/A

kE = 0.5V/rad/s

Ra = 0.37Ω

La/Ra = 4.05 × 10−3 s

Jeq = 0.0079kg-m2

The servo motor is driven by a full-bridge four-quadrant dc-dc converter operating from a 200V dc bus. The motor is delivering a torque of 5Nm at a speed of 1500rpm. The switching frequency is 20kHz.

1. Build the above dc motor and power electronic converter in Simulink.

Using the simulation model, determine the peak-peak ripple in the armature current for the above operating condition in open-loop?

2. Design the current loop for a crossover frequency of 1kHz and the speed controller for a crossover frequency of 100Hz.

3. Build the closed loop model in Simulink. In the model, For a step increase in load torque from 5Nm to 10Nm, with the speed reference at rated value, plot the response of the system speed and armature current.

"We Offer Paper Writing Services on all Disciplines, Make an Order Now and we will be Glad to Help"