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ptc-49758001-Visitor
1-Visitor
February 20, 2013
Solved

DE, error, This function cannot be used here

  • February 20, 2013
  • 1 reply
  • 3264 views

I cannot solve a nonlinear DE, the Odesolve gives the error "This function cannot be used here" (Mathcad 15 M020), please help!

Best answer by AndyWesterman

Hello Ivanov,

Looking at your worksheet , I think that the problem comes from the definition of mu.

The DE initial condition i.0(0)=0 means that the diferential equation has to calculate the L.0 value for i=0 & the mu function in this case will return NaN so the calculation must fail.

For a magnetic material I would not expect the mu value to increase asympototically to infinity but rather plateau at a value determined by the material & core parameters.

Hope this helps


Regards

Andy

1 reply

P
ptc-49758001-VisitorAuthor
1-Visitor
February 20, 2013

Mathcad file with english symbols.

A
AndyWesterman12-AmethystAnswer
12-Amethyst
February 20, 2013

Hello Ivanov,

Looking at your worksheet , I think that the problem comes from the definition of mu.

The DE initial condition i.0(0)=0 means that the diferential equation has to calculate the L.0 value for i=0 & the mu function in this case will return NaN so the calculation must fail.

For a magnetic material I would not expect the mu value to increase asympototically to infinity but rather plateau at a value determined by the material & core parameters.

Hope this helps


Regards

Andy

P
ptc-49758001-VisitorAuthor
1-Visitor
February 21, 2013

Thank you very much!

Yes, this is a mistake comes from the definition of mu. I made a correction.

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