LAUNCHXL-F28069M: How to increase data captured by scope in simulink, real time motor control

Mar120

Part Number: LAUNCHXL-F28069M

Hi,

currently running the setup described in https://au.mathworks.com/matlabcentral/fileexchange/49109-dual-motor-control-with-ti-launchxl-f28069m-launchpad

using a single motor with the code. while running the motor there is a delay when adjusting the desired speed attached below. The delay occours when the scope is added to measure the estimated speed, but becomes more responsive to speed adjustments after about 1 minute of operation. Along with this the scope data received is only the last 5-10 data points (depending on the duration selected in the settings: code/external mode control panel/ signal and triggering )captured so it is difficult to plot the response of the motor with changes in speed. The scope settings have sampling time of 0.01s. Attached also is the setting for the signal and triggering settings as well as the scope settings.

Any help would be much appreciated,

Simulink PMSM motor control model.

settings for scope, gain and rate transmission.

External Signal and triggering settings

regards,

Mary.

over 6 years ago

0 venkatesh chilapur over 6 years ago

Mastermind 6460 points

Hi,

We are looking in to this, in the meantime, please consider reaching out to MathWorks support to get MathWorks Motor Control experts to work through this case.
www.mathworks.com/.../contact_us.html

0 venkatesh chilapur over 6 years ago in reply to venkatesh chilapur

Mastermind 6460 points

Hi,

If you observe breaks in the scope traces you can try the following to improve logging performance:

- Increase serial baud rate

- Decrease the number of signals selected for logging

- Decrease the model base rate

When running external mode, be careful not to increase the acquisition frequency beyond the functional range of 10kHz. Please refer the MATLAB Answer post below which gives details on modeling workarounds using Rate Transition block and DSP buffer blocks that can help step up the acquisition frequency up to 50KHz on F28379D board. The same but underlying concepts can be used on any board.

https://in.mathworks.com/matlabcentral/answers/353179-how-to-increase-acquisition-frequency-in-real-time-ti-board-f28379d

The above link also contains information on the 2-Model approach which is seen as an alternate to external mode simulation for fast data logging up to 200kHz.

HTH,

C2000™︎ microcontrollers

C2000 microcontrollers forum

LAUNCHXL-F28069M: How to increase data captured by scope in simulink, real time motor control