I am struggeling to understand the following:
If I consider a synchronous motor with only one polepair and apply dc-voltage to two of the three phases this results in a static magnetic field. The rotor, represented as a magnet, would aline like shown in drawing_1:
If I now try to rotate the rotor it "locks" in this one position.
My questions about this are:
- Have I drawn the polepairs the belong together correctly?
- Are the shown positions in which the rotor would lock correct?
- Why wouldn't the rotor lock in two more positions? 90° from the positions as shown in a) and b) ?
(I took the pictures from this animation: https://www.renesas.com/sites/default/files/inline-images/fig3-a-bldc-monitor-en.gif )