Editing Determining motor pole count
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+ | [[File:Wyedelta.jpg|thumb|3 phase AC/BLDC motor winding schemes. A, B and C represent the phase wires coming out of motor.]] | ||
If magnetic pole count of permanent magnet AC/BLDC motor is unknown, there is an easy way to determine it experimentally. | If magnetic pole count of permanent magnet AC/BLDC motor is unknown, there is an easy way to determine it experimentally. | ||
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Needed items: | Needed items: | ||
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#3 phase AC/BLDC motors | #3 phase AC/BLDC motors | ||
#Adjustable lab DC power supply | #Adjustable lab DC power supply | ||
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Procedure: | Procedure: | ||
#Wire DC power supply + and - wires between any of two leads of the motor. I.e. + to A and - to B while C is not connected. | #Wire DC power supply + and - wires between any of two leads of the motor. I.e. + to A and - to B while C is not connected. | ||
− | #Use the PSU to drive some DC current to the windings. Don't exceed motor's current rating. A good starting value may be | + | #Use the PSU to drive some DC current to the windings. Don't exceed motor's current rating. A good starting value may be 20-30% of motor continuous current. Now motor should start holding position as the rotor's magnets snap to the driven windings. |
#Rotate motor shaft by hand or tool and count the distinct snapping positions per one revolution. | #Rotate motor shaft by hand or tool and count the distinct snapping positions per one revolution. | ||
#Motor pole count is twice as much as the number of snapping positions found in the previous step. I.e. if motor snaps 2 times per revolution, it means that motor has 4 magnetic poles. | #Motor pole count is twice as much as the number of snapping positions found in the previous step. I.e. if motor snaps 2 times per revolution, it means that motor has 4 magnetic poles. | ||
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*If motor is too stiff to rotate, reduce current. | *If motor is too stiff to rotate, reduce current. | ||
*If snaps can't be felt, increase current to make them stronger. | *If snaps can't be felt, increase current to make them stronger. | ||
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