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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:

Electric DC motor model

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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