A brushless DC motor with permanent magnets and three phase coil excitation.
Problem Type:
A nonlinear plane-parallel problem of magnetostatics.
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 550000 A/m. The currents for each phase coil are as follows: 13.5 A on R+, –13.5 A on R–, 13.5 A on S+, –13.5 A on S–, and zero on T+ and T–. The inner and outer frames are made of Cobalt-Nickel-Copper-Iron alloy.
The B-H curve for the Cobalt-Nickel-Copper-Iron alloy:
H (A/m) | 20 | 60 | 80 | 95 | 105 | 120 |
B (T) | 0.19 | 0.65 | 0.87 | 1.04 | 1.18 | 1.24 |
H (A/m) | 140 | 160 | 180 | 200 | 240 | 2500 |
B (T) | 1.272 | 1.3 | 1.32 | 1.34 | 1.36 | 1.45 |
The B-H curve for the steel:
H (A/m) | 400 | 600 | 800 | 1000 | 1400 | 2000 | 3000 | 4000 | 6000 |
B (T) | 0.73 | 0.92 | 1.05 | 1.15 | 1.28 | 1.42 | 1.52 | 1.58 | 1.60 |
See the Magn4.pbm problem in the Examples folder.