Learning Forum

[uwindsorspz]

Hello All,nIf calculation the electromagnetic force for electric motor in ansys and workbench, anyone knows which part of the flux density has been considered?nIs the flux density in the stator teeth tip part or even the flux density in air gap near to slot considered>?nThanks.n

[Navya C]

Hi,nCan you provide more information regarding which force are you talking about and on which part of the motor?nIf you have any application please share the sketch for better understanding of your question.nnRegardsnNavyan

[uwindsorspz]

Hello Navya,nnThanks for your reply.nFor the harmonic vibration analysis of the electric machines, the electromagnetic force in the air gap is the excitation, which is generated by the ansys maxwell. And the electromagnetic force on each stator teeth tip is simulated in the workbench. Could I ask which part of the flux density are considered in the simulation? Is that the red arch shown in the picture?.Thanks,nAtlasnn

[DELI]

Flux density is calculated in the entire region. If you are using Maxwell stress tensor method to calculate harmonic fore, the force will be along the arc in air gap.n

[uwindsorspz]

Hello deli,nThanks for your reply.nI know there are two methods can be used to calculate the EM forces in airgap, Maxwell tensor method and virtual work method. During the simulation in ansys, could we change the method for the calculation?nThanks a lot.nAtlas.n

[DELI]

nYes, you can use both maxwell stress tensor and virtual force in Maxwell, equation and the line will be different.nnn

[uwindsorspz]

Thanks a lot for the detailed explanation.nCould I ask where could I get these slides? it may help me to understand the background knowledge.n

[DELI]

Sorry this is from an internal presentation, I can only share the generic part. Hope it helpsIf you are looking for more in depth support, feel free to submit a service request. n

[uwindsorspz]

Thanks a lot for the reply.nn

[Tennywang]

Hi,nAdd something, flux density formula: FB=B?A=BAcos? F B = B ? A = BA cos ? , where B is the magnitude of the magnetic field (having the unit of Tesla, T), A is the area of the surface, and ? is the angle between the magnetic field lines and the normal (perpendicular) to A.n