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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

IRMS

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

and can contain up to 33 values. All its values must be greater than zero and strictly increasing. Linear interpolation will be performed by the model to compute values between defined data points.

Code Block
languagejson
"NoLoadStatorCurrent": [
  5.0,    
  10.0,    
  17.0
],

NoLoadLineToLineVoltage

VLL,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

and can contain up to 33 values. All its values must be strictly increasing. Linear interpolation will be performed by the model to compute values between defined data points.

Code Block
languagejson
"NoLoadLineToLineVoltage":  [
  120.0,
  230.0,
  300.0
],

NoLoadFrequency

f

double

Hertz

Frequency used during the no-load test.

  This

 This value cannot be zero.

Code Block
languagejson
"NoLoadFrequency": 60,

NominalStatorLeakageInductance

Lls

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.

Code Block
languagejson
"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).

...

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.

...

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

View file
nameMagnetizing Inductance JSON Template.json

Note

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

...