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Magn4: Electric 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.
The four magnets are made of Samarium-Cobalt with relative permeability of 1.154 and coercive force of 550000 A/m. The current densities for the coil slots are as follows:
1,300,000 A/m2 on R+, -1,300,000 A/m2 on R-,
1,300,000 A/m2 on S+, -1,300,000 A/m2 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 |
140 |
160 |
180 |
200 |
240 |
2500 |
B (T) |
0.19 |
0.65 |
0.87 |
1.04 |
1.18 |
1.24 |
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 |
Results:
Flux density in brushless DC motor with permanent magnets and three phase coil excitation:
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