RE: Wakey wakey Dumbo6 Dec 2021 11:22
With all due respect Dumbputer, a permanent magnet doesn't provide power. It provides a magnetic field which can be measured in terms of flux, & flux density. If I recall correctly, a motor consist of a stator winding and an armature winding. In a permanent magnet motor, current is fed to the armature which produces a magnetic field which interact with the magnetic field of the permanent magnet which cause the armature to rotate, thereby converting electrical energy into mechanical energy, ie motion. With an induction motor, electrical energy is fed to the stator winding which creates a magnetic field. That magnetic field induce a voltage in the armature winding which cause a current to flow which produces a magnetic field which then interact with the stator magnetic field which cause the armature to rotate. Again, electrical energy converted to motion. The power fed to the induction motor is in the for of alternating voltage and current. No power produced by the permanent magnet, and the electrical energy applied to the motor isn't free.