Project - Speed Control of a Direct Current (DC) motor
solution:
- Here the Speed control of a DC motor is either done manually by the operator or by means of an automatic control device.
- This is different to speed regulation where the speed is trying to be maintained or regulated against the natural change in speed due to a change in the load on the shaft
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so the speed can be varied by changing:
- The terminal voltage of the armature V
- The external resistance in armature circuit Ra
- The flux per pole
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So Terminal voltage and external resistance involve a change that affects the armature circuit while flux involves a change in the maginetic field
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so Therefore speed control of DC motor can be classified into:
- Armature Control Methods
- Field Control Methods
- Here first we need to creat simulink model of the DC motor and make it as subsytem called the DC motor
Simulink model for the DC motor:
Parameters:
Block Parameters Of Discrete PID Controller:
Initially Kp=1,Ki=1,Kd=0, After Tuning we set Kp,Ki,Kd as 31.58, 82.37, 2.35 Respectively. To Obtain Desing Control Objectives Of settling time ,overshoot and Steady State Error within the limit.
Plotting while Tuning as settling time as 1.51 sec:
Plotting while Tuning as overshoot is less than 5%:
Plotting while Tuning as Steady State Error is less than 1%:
Final Plot After Updating into Block:
Maintaining Stability of a dynamic system:
Scope Results:
1) To maintain a desired speed for the motor (case 1:Desired Speed = 50):
2) To maintain a desired speed for the motor (case 2:Desired Speed = 230):
Here by observing the above two graphs we change the desired speed as 50 in the case1 and 230 in the case 2
But here both the plots reamains same
So by this we can say that we maintained desired speed of a DC motor
Conclusion:
we have desined In this project a Simulink model for the DC motor as shown in Figure 1.and also we Use the Proportional Integral and Derivative PID control design knowledge gained in the training to design develop and test a controller to maintain a desired speed for the motor
All the required images and files are attached with answer body as above and below