Learning Forum

[Abdur Rahman]

Hi, 

 I am trying to obtain unbalance magnetic force acting on the rotor of a PMSM. Could anybody suggest me how can I obtain radial and tangential force acting on the rotor of a PMSM? Can I get it directly using field calculator, if so, please explain step by step? Also, please explain how can I write the Maxwell stress tensor formula, as shown in the figure, in the field calculator.   Thanks. 

Fx can also be expressed as eqn (4)

[DELI]

hi, you can use field calculator to create named expression for radial and tangential force.

Br=ScalarX(ToCylindrical(,offset<0mm, 0mm, 0mm>))

Bt=ScalarY(ToCylindrical(,offset<0mm, 0mm, 0mm>))

mu0=1.25664E-06

Fmst_r= /(-(*(Br, Br), *(Bt, Bt)), *(mu0, 2))

Fmst_t= /(*(Br, Bt), mu0)

 

 

 

[GLUO]

Hello,

Please use the radial flux density to get the radial force.

For radial flux density in field calculator:

Input > Quantity > B
Vector > Scal? > ScalarX
Input > Function > Scalar > PHI
Scalar > Trig > Cos
General > *
Input > Quantity > B
General > Smooth
Vector > Scal? > ScalarY
Input > Function > Scalar > PHI
Scalar > Trig > Sin
General > *
General > +
Select Add and set the name of expression as B_radial

[GLUO]

You can also rightclick the design name to enable harmonic force calculation. The tangential and the radial force will be ready in the report. MST is defined as Fmst_r=(Br^2-Bt^2)/(2*mu0), Fmst_t=Br*Bt/mu0.

GL