Brushless DC motor torque - QuickField simulation example
A brushless DC motor with permanent magnets and three phase coil excitation.
How to calculate the torque of a brushless DC motor as a function of rotor position?
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
Solve a sequence of DC-magnetic rotor positions with the specified phase currents and calculate electromagnetic torque at each position.
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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