Can someone explain me the DC Motor Figure result?

Question

Alex Kolegkas 2023-1-5

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回答： Sabin 2023-1-5

https://ch.mathworks.com/help/physmod/sps/ug/motor-torque-speed-curves.html

Hello everyone,

As i see on the figures (characteristics) for the 5 different type of motors, We have a linear characteristic on the DC motor after 5629 RPM (Torque- speed characteristic) and after 5626 RPM (Power-speed characteristic). I can't understand the model - why we don't have a linear characteristic starting from 0 RPM or 0 Watt.

Thank you in advance

Yours,

Alex kolegkas

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Answer 1

Sabin 2023-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/1888917-can-someone-explain-me-the-dc-motor-figure-result#answer_1142127

The problem here is that Simscape data logging is limited to 10000 points but in the DC-Motor case the solver needs more points to simulate 60 seconds. Therefore, the plot function is displaying only the last part of the characteristics. A quick workaround would be to uncheck the ‘Limit data points’ box in the Configuration Parameters/Simscape: