Equivalent circuits of three-phase induction motor

The equivalent circuits as in Fig. 1 can be represented the
steady state behavior of a three-phase induction motor.
Where
R1 : stator resistance
X1 : stator leakage reactance
Rc : core loss resistance,
Xm : magnetizing reactance,
R2 : rotor resistance referred to stator,
X2 : rotor leakage reactance referred to stator,
Xeq : equivalent leakage reactance ( X1 + X2 ),
s : slip

From the six-impedance and approximate equivalent circuits,
the equations of stator current ( I1 ) and power factor ( PF )
can be expressed as in (1) and (2) respectively.

Fig. 1. Equivalent circuits of three-phase induction motor
a) six-impedance b) approximate

Source pdf
http://www.eng.mut.ac.th/upload_file/product/43.pdf

Calculation Equivalent of induction motors program

Calculation the equivalent circuit of AC induction motors program

REMCAD

The program is designed for users and designers of electric-motor
drives with AC induction motors powered by Frequency inverters.

DESCRIPTION OF THE PROGRAMThe RemCad program can be

used for:1.1 the storage of basic machine data1.2 the calculation

and drawing of the characteristics on the basis
of the Equivalent Circuit (Torque, PowerFactor, Efficiency,
InputPower etc.)1.3 The export of the calculated data
The calculation and drawing of the characteristics on the basis of
the equivalent circuitThe following characteristics are drawn and

calculated:- the Moment characteristic dependant on frequency

and current
(current being the parameter)- the PowerFactor characteristic

dependant on frequency and current (current being the parameter)-

the Efficiency characteristic dependant on frequency and current
(current being the parameter)- the InputPower characteristic

dependant on frequency and current (current being the parameter)

The calculation is performed on the basis of the equivalent circuit
of the asynchronous machine.

Fig 1. Equivalent Circuit Diagram of AC induction machine

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