For a PMSM BLDC machine configured to use the PMSM Variable Ld/Lq motor type, a JSON file is required to define the motor characteristics. The file must contain the following information:
Parameter (JSON key) | Value type | Unit | Description | Example |
|---|---|---|---|---|
PolePairs | int | Number of pole pairs of the machine. | "PolePairs": 2 | |
DqTransformAngleOffset | double | degree | Angle offset applied to the DQ Transform, before Id and Iq are referenced to look up Ld, Lq, and Fm. A value of 0 indicates that the D axis is aligned with Phase A when the rotor angle θ=0. In other words, the active power reaches a maximum when Id is at a maximum. This is the default behavior. For more information, see the DQ Transform description. | "DqTransformAngleOffset": 0 |
Ra | double | Ohm | Phase A Resistance of the machine | "Ra": 0.04 |
Rb | double | Ohm | Phase B Resistance of the machine | "Rb": 0.04 |
Rc | double | Ohm | Phase C Resistance of the machine | "Rc": 0.04 |
Id_axis | double[] | A | One dimensional array of the current values along the Direct axis of the stator. This array must be the same size as Iq_axis, and its values must be arranged in ascending order. | "Id_axis": [ -50.0, 0.0, 50.0 ], |
Iq_axis | double[] | A | One dimensional array of the current values along the Quadratic axis of the stator. This array must be the same size as Id_axis, and its values must be arranged in ascending order. | "Iq_axis": [ -50.0, 0.0, 50.0 ], |
Ld | double[][] | H | Two dimensional array of the Direct inductance values. The size of this array must be n x n, where n is equal to the number of current values in Id_axis and Iq_axis. Figure 1 below describes how the inductance values are mapped from the JSON file array to the Ld table. | "Ld": [
[
0.0004,
0.00042,
0.00041
],
[
0.00041,
0.00044,
0.00043
],
[
0.0004,
0.00042,
0.000425
]
],
|
Lq | double[][] | H | Two dimensional array of the Quadratic inductance values. The size of this array must be n x n, where n is equal to the number of current values in Id_axis and Iq_axis. Figure 1 below describes how the inductance values are mapped from the JSON file array to the Lq table. | "Lq": [
[
0.0004,
0.00042,
0.00041
],
[
0.00041,
0.00044,
0.00043
],
[
0.0004,
0.00042,
0.000425
]
],
|
Fm | double[][] | Wb | Two dimensional array of the Permanent Magnet Flux Linkage values. The size of this array must be n x n, where n is equal to the number of current values in Id_axis and Iq_axis. Figure 1 below describes how the inductance values are mapped from the JSON file array to the Permanent Magnet Flux Linkage table. | "Fm": [
[
0.1,
0.1,
0.1
],
[
0.1,
0.1,
0.1
],
[
0.1,
0.1,
0.1
]
]
|
An example Motor Model File in JSON format is available here:
This file is intended for use as a template only; it does not contain valid simulation data.