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Magn4: Electric motor

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.

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.