Issue with harmonic force calculation

- January 20, 2024 at 7:59 pm
  
  sli238
  Subscriber
  
  Help with the issue about harmonic force calculation. The result shows that the result of harmonic force value is negative, and I don't know which part of setup is wrong?
- January 22, 2024 at 3:21 pm
  
  Timos
  Ansys Employee
  
  Hello, the electromagnetic forces generated by the rotating magnetic field in the machine are often sinusoidal in nature. This is because the magnetic field produced by the rotor winding induces a sinusoidal distribution of magnetic flux within the stator core. The resulting force on the stator teeth, which is a function of the interaction between the magnetic field and the stator winding, can be described by a sinusoidal waveform. In addition to the sinusoidal component, there may also be a DC component.
  Did you run the simulation with a higher Stop Time? Is you motor unbalanced? Are there any other asymmetries in the magnetic circuit and the mesh?, or other non-uniformities in the machine design?
- January 22, 2024 at 3:46 pm
  
  sli238
  Subscriber
  
  Hi, Timos, thanks for you reply.
  This motor is 12 slots and 10 poles SPM, I follow all setps of the documents (NVH Analysis setup in Maxwell 2023R1). I check out some result, like MST_Torque, radial force by fields calculation, these result value is positive. Howere, only transientforce_r value is negative. Could you please help me to address this issue?