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Example of External Circuit Conversion Setup

If external circuit coupling is ON in the magnetic transient analysis, conversion for external circuit can be set up on the [Magnetic analysis tab].

Example of conversion setup is explained here.

Examples

The following are the setup examples of full model and partial models of an IMP motor.

Motor type: Permanent magnet synchronous motor(IPM), Inner rotor

Number of poles: 12 poles, 18 slots

Coil connection: 3 series, 2 parallels

Number of turns of coil: 35 (Set up on the [Current tab] of Body Attribute.)

Phase resistance of coil: 6Ω

Connection type of coils: Y connection, concentrated winding

Coils are placed on the stator core.

Red: U-phase coil

Green: V-phase coil

Blue: W-phase coil

Select [Do not convert]

Resistance of each FEM coil: 4Ω

As the phase resistance is 6Ω with 3 series and 2 parallels, resistance of each coil is 4Ω.
The same calculation can be performed with 12Ω by combining three FEM coils in series as one.

Select [Convert]

Number of series: 3

Number of parallels: 2

Resistance of each FEM coil: 6Ω

External circuit conversion is ON. One FEM coil is placed in each phase of the external circuit. The resistance of each coil is equal to the phase resistance. It is 6Ω.

Select [Do not convert]

Amplitude of the 3-phase DC power source

Voltage of voltage source: Phase voltage/number of series=V/3

Current of current source: Phase current/number of parallels=I/2

As external circuit conversion is OFF, the value of input power must be converted for a partial model.
Therefore, the voltage is divided by the number of series, and the current is divided by the number of parallels.

Resistance of each FEM coil: 4Ω

As external circuit conversion is OFF, the value must be converted for a partial model.
Therefore, the resistance of each coil is 4Ω.