Brushless DC motor torque - QuickField simulation example
A brushless DC motor with permanent magnets and three phase coil excitation.
How to find BLDC motor magnetic field distribution?
Answer Typical applications Geometry
Axial length of the motor is 40 mm.
Given
The current densities for the coil slots are as follows:
The inner and outer frames are made of Cobalt-Nickel-Copper-Iron alloy.
The B-H curve for the steel:
Task
Results
Engineering question
Set up a plane-parallel QuickField DC Magnetics problem for a brushless DC motor and evaluate magnetic field distribution from computed field results.
BLDC motors, permanent magnet rotors, brushless motor assemblies
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Simulation problem
Problem Type
Plane-parallel problem of DC magnetics.
The four magnets are made of Samarium-Cobalt with relative permeability of 1.154 and coercive force of 550 kA/m.
phase A: 1.3 A/mm²,
phase B: -1.3 A/mm²,
phase C: 0 A/mm²
The B-H curve for the Cobalt-Nickel-Copper-Iron alloy:
Calculate the torque as a function of rotor position.
The maximal torque is 0.094 N*m.
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