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Brushless DC motor
A brushless DC motor with permanent magnets and three phase coil excitation.
Problem Type:
Plane problem of DC magnetics.
Geometry:
Axial length of the motor is 40 mm.
Given:
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:
Results:
Flux density in brushless DC motor with permanent magnets and three phase coil excitation:
