Hello, can someone please help me connect a dc motor to this pwm control circuitry.

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Anant
Anant 2024-10-28，14:12
评论： Shivam Gothi 2024-10-30，4:00
I wanted help in connecting a dc motor to this control circuitry given in Simulink such that the as the duty cycle changes, the speed of the DC motor changes proportionally. If possible then please complete the circuit and share the file with me in the comments as I have project submission tomorrow afternoon. I have attached the model above.

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Shivam Gothi
Shivam Gothi 2024-10-29，6:08
Hello @Anant,
As per my understanding, you are trying to drive a DC machine using the control circuit made using NE555 timer. Your aim is to vary speed by turning the knob.
You can do this by using a buck converter that receives gate pulses from the control circuit. The output of buck converter drives the DC motor. I am suggesting one of the possible way to do it in the below screenshot.
Here, I have used the model “DC Motor” available in “Simscape > Electrical > Electromechanical > Brushed Motors”. I am using a frictional load to model mechanical load torque on the machine.
https://www.mathworks.com/help/releases/R2024a/sps/ref/dcmotor.html
In the above Simulink model, I am turning the “duty Cycle control knob” and observing the speed output of the DC motor on the scope. Below scope shows the speed of the DC motor.
I have attached the Simulink model. To know more information about the block used, navigate to the ”help” tab of the “block parameters” for that particular block.
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Anant
Anant 2024-10-29，16:58
Also please tell me why does the simulation take too much time for a 100k potentiometer than a 470k one?
Shivam Gothi
Shivam Gothi 2024-10-30，4:00
Hello @Anant,
Also provide the electrical parameters of motor such as its resistance and inductance. You can alse pulg in the values in the model and check whether it is working as per your satisfaction.
The back-emf constant can be approximately calculated by (rated terminal voltage / rated speed (in RPM))

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