Minimizing the cogging torque in a brushless DC motor
The predicted cogging torque in a brushless DC motor is compared between two different stator geometries: a straight stator and a skewed stator.
Cogging torque is undesirable because it introduces vibration and noise, and also makes precise positioning of the rotor impossible because the rotor tends to lock onto a position where it is aligned with the stator poles. By skewing the stator, the cogging torque can be significantly reduced.
MagNet makes it easy to set up multiple problems for solution at different rotor angles. And MagNet's Static 3D solver reports the magnetic forces and torques experienced by each body in the model, so it is easy to create a torque-angle curve. Open Report (Model 0088)Request MagNet model files - Model Number 0088