[Getdp] problem with machine_magstadyn_a.pro
Joseph Frippiat
joseph_frippiat at voo.be
Sat Feb 13 12:38:31 CET 2016
I'm modeling a rotating eddy current brake whith Onelab and the library
machine_magstadyn_a.pro .
My problem is that the torque does not drop when the rotor speed
decreases to 0 rpm...
In the model, the smooth solid steel rotor is outside and the stator is
inside.
I give an initial speed to the rotor and I apply a dc voltage to the
windings of the stator.
In the original formulation, Torque_mag tends always to accelerate the
rotor. That's why I've modified lightly the mechanical formulation like
this (the machine is a generator) :
Equation {
GlobalTerm { DtDof [ Inertia * Dof{V} , {V} ] ; In DomainKin ; }
GlobalTerm { [ Friction[] * Dof{V} , {V} ] ; In DomainKin ; }
GlobalTerm { [ Torque_mec[] , {V} ] ; In DomainKin ; }
If(Flag_MachineType) // Motor
GlobalTerm { [ -Torque_mag[] , {V} ] ; In DomainKin ; }
Else // Generator
GlobalTerm { [ Torque_mag[] , {V} ] ; In DomainKin ; }
EndIf
GlobalTerm { DtDof [ Dof{P} , {P} ] ; In DomainKin ; }
GlobalTerm { [-Dof{V} , {P} ] ; In DomainKin ; }
}
Joseph
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