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Magnetic sturation in BLDC motor

Magnetic sturation in BLDC motor

Magnetic sturation in BLDC motor

(OP)
How does one calculate the magnetic saturation point of an iron stator brushless DC machine?   I am am trying to figure out the most efficient winding for an outside runner BLDC motor.  Also how can I estimate the no load current at a fixed voltage?

The specs on the Stator are as follows:

OD: 28mm
Lenth: 9mm
Lamination thickness: .2mm
Stator tooth height: 6mm (from base to hammerhead)
Tooth width: 1.5mm
# Stator teeth: 12
# of magnets: 14
Winding pattern: DLRK (AabBCcaABbcC)
Magnet strength: N45
Airgap: .3mm
Magnet thickness: 1.5mm

 

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If it is broken, fix it.  If it isn't broken, I'll soon fix that.

RE: Magnetic sturation in BLDC motor

For an Unfocused Magnetic Circuit (with back iron return path), the Permeance Coefficient PC is

PC = [Magnet Length]/[Gap Length] = 1.5/0.3 = 5

The Gap Field strength is given by

Bg = Br {PC/[PC+1}

If Br for the 45 MgOe RE magnet is 1.2 Tesla, the field strength in the gap is

Bg = (1.2)(5/[5+1])= 1.0 Tesla

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