Modifying DC Machine Block in Simulink for Custom Motor Specifications

Hello MATLAB Community,

I'm working on an assignment where I need to design a DC-DC converter for a DC motor drive system in an electric vehicle using Simulink. My challenge is customizing the DC machine model in Simulink to accurately represent the motor's specific specifications. The motor's specs are:

• Rated Power: 50 kW
• Rated Voltage: 200V DC
• Rated Current: 250A

The assignment's objective is to develop a DC motor drive system that integrates with a DC-DC converter.

I need to model a DC motor in Simulink that matches these specs but have found that the preset models in the DC machine block do not fit these requirements.

Could you guide me on how to adjust these parameters in an existing block or create a custom model to reflect my motor's specifications accurately?

Any suggestions or detailed steps would be greatly appreciated. I will attach the Matlab file under this question for reference.

Thank you for your help!

Answer 1

[Ganesh]

Hi @Badr Al-Sabri,

The "DC Machine Block" that you are using in your Simulink Model is intended to be used with Mechanical Inputs and does not talk about a DC Motor. From your use case, I understand that this is not the block you intend to use.

Kindly refer to the below documentation to understand the working of a "DC Machine Block":

https://in.mathworks.com/help/sps/powersys/ref/dcmachine.html

The system that you intend to build can be found in the link below:

https://in.mathworks.com/help/sps/ug/example-modeling-a-dc-motor.html

You may use the "DC Motor Block" and modify the parameters according to your specifications. This also gives you freedom to modify individual block properties of the model.

Hope this helps!

[Badr Al-Sabri]

Thank you Sir for your valuable answer.

This website: https://in.mathworks.com/help/sps/ug/example-modeling-a-dc-motor.html uses simscape block.

Instead I am not used to Simscape, but...

Can I use the DC machiene block and add a supply volage at the (F+ and F-) and add a resistor so I can make the current = 250 A?

Because my motor specs should be:

• Rated Power: 50 kW
• Rated Voltage: 200V DC
• Rated Current: 250A

Because I am doubt, because all videos in Youtube that design the same objective of my assignment uses a DC machine block.

No one is using the simscape blocks (this is not an escape)

But I want to know more, because of you I have finished the Power Electronics onramp course, so I can be use to Simscape blocks.