A brushless DC motor with permanent magnets and three phase coil excitation.
Plane problem of DC magnetics.
Axial length of the motor is 40 mm.
The four magnets are made of Samarium-Cobalt with relative permeability of 1.154 and coercive force of 550 kA/m.
The current densities for the coil slots are as follows:
phase A: 1.3 A/mm2,
phase B: -1.3 A/mm2,
phase C: 0 A/mm2
The inner and outer frames are made of Cobalt-Nickel-Copper-Iron alloy.
The B-H curve for the Cobalt-Nickel-Copper-Iron alloy:
The B-H curve for the steel:
Flux density in brushless DC motor with permanent magnets and three phase coil excitation: