Magnetizing Inductance File [JSON]

For an Induction Machine with Saturation, a JSON file is required to define the saturation characteristics of the machine. The file must contain the following information:

Parameter (JSON key)	Symbol	Data Type	Units	Description	Example
NoLoadStatorCurrent	I_RMS	double[]	Arms	One dimensional array of root-mean-square stator current values measured under no-load test conditions. This array must be the same size as NoLoadLineToLineVoltage. All its values must be greater than zero and strictly increasing.	"NoLoadStatorCurrent": [ 5.0, 10.0, 17.0 ],
NoLoadLineToLineVoltage	V_LL,RMS	double[]	Vrms	One dimensional array of root-mean-square, line-to-line voltage values measured under no-load test conditions. This array must be the same size as NoLoadStatorCurrent, and its values must be strictly increasing.	"NoLoadLineToLineVoltage": [ 120.0, 230.0, 300.0 ],
NoLoadFrequency	f	double	Hertz	Frequency used during the no-load test. This value cannot be zero.	"NoLoadFrequency": 60,
NominalStatorLeakageInductance	L_ls	double	Henry	Nominal value of the stator leakage inductance calculated using the locked-rotor test. If this value is zero, the resulting magnetizing inductance is calculated ignoring the voltage drop in the stator leakage inductance.	"NominalStatorLeakageInductance": 0.0008

For additional details about the locked-rotor test and the no-load test, please refer to the IEEE Standard Test Procedure for Polyphase Induction Motors and Generators (IEEE-112).

Parameter Constraints

The following constraints apply to the parameters defined in the file. If the current and voltage measurements are not compatible with the nominal parameters, an error will be thrown.

(1)

Example

{
  "NoLoadStatorCurrent": [
    5.0,
    10.0,
    17.0
  ],
  "NoLoadLineToLineVoltage": [
    120.0,
    230.0,
    300.0
  ],
  "NoLoadFrequency": 60,
  "NominalStatorLeakageInductance": 0.0008
}

An example Magnetizing Inductance File in JSON format is available here:

This file is intended for use as a template only; it does not contain valid simulation data.