Have read somewhere, that brushless DC motors have constant torque.
How can this be true?
Regard motor on the picture:
If constant current flows as red arrows indicate, the magnetic field appears as blue arrows indicate. The permanent magnet (not shown) tends to put it's
S poles appropriate.
All this time, the current remains constant.
Then how the torque can be constant, as the magnet approaches it's final position? Isn't torque decreasing as this happening?
Wouldn't it be more constant torque, if I power the winding coils with three phase sinusoidal current, having phase ahead by some value relative to rotor?