BLDC Back EMF parameters file

How to specify Back EMF parameters in the Schematic Editor ?

The BLDC block has a "Back EMF profile" parameter, in the "Electrical" tab, which is a dropdown. When the "User defined" option is selected, you are allowed to specify a file which should contain the Back EMF values in the “Back EMF profile table" field.

This file has to be in a specific format which is described below.

What is the format of the Back EMF parameters file ?

The Back EMF parameters are described in a JSON format. The following parameters must appear in the file.

Paremeter (JSON key)	Value type	Unit	Description	Example

Paremeter (JSON key)

Value type

Unit

Description

Example

backEmfValues

double[1024]

N/A

One dimensional array of the back EMF waveform values.

The range of values must be from -1 to 1!

Needs to be 1024 values!

"backEmfValues": [
-0.0,
-0.005,
-0.01,
[…]
0.01,
0.005
],

All the examples above concatenated would give in a valid JSON format: