topic Re: Motor Control Class: Lecture 9 - Open Loop Control System in Model-Based Design Toolbox (MBDT)

Motor Control Class: Lecture 9 - Open Loop Control System

Daniel_Popa — Sun, 25 Jun 2017 09:35:48 GMT

In this 9th lecture of the motor control course we discuss open loop control system and how to build a Simulink model to allow us to control the BLDC motor without closing the speed control loop. We start from the models developed in previous lecture and by putting together all these models we will spin up for the first time the BLDC motor based on Hall sensor commutation.

Main topics:

- What is Open Loop Control system and how is it different from a Closed Loop Speed Control system ;

- Build the Simulink model for Open Loop control of BLDC motor;

Objectives:

- Understand the benefits of Open Loop Control system;

- Validate all the concepts we learn so far;

- Apply and reuse all the models we developed so far in this course;

- Spin the motor for the first time;

NOTE: Chinese viewers can watch the video on YOUKU using this link

注意：中国观众可以使用此链接观看YOUKU上的视频

Additional information:

- pdf attached with slides shown in this video;

- Simulink model used in this video;

Original Attachment has been moved to: Lecture9.zip

Update revisions:

February 25, 2019

update the model to work with Model-Based Design Toolbox for MPC57xx Automotive Version 3.0.0 .

May 06, 2020

update the model to work with Model-Based Design Toolbox for MPC57xx Automotive Version 3.2.0 .

Re: Motor Control Class: Lecture 9 - Open Loop Control System

darrin_weiss — Wed, 09 Jan 2019 16:16:59 GMT

Hi, this is a great course!

I have a question/problem: When running the code generated by this example, it appears that the power stage becomes disabled when Freemaster connects to the target. Any ideas why, and what to do to get the power stage re-enabled? Also, why are some model variables not visible in Freemaster? (For example, "PhaseA", "EN", etc)

Re: Motor Control Class: Lecture 9 - Open Loop Control System

darrin_weiss — Tue, 22 Jan 2019 16:29:13 GMT

More info. It seems that the EN and RST lines have constant glitching when Freemaster is connected. Is there a setting to prevent this?

Re: Motor Control Class: Lecture 9 - Open Loop Control System

Daniel_Popa — Tue, 22 Jan 2019 18:02:12 GMT

Hello darrin.weiss@baesystems.com‌

Please check this article: https://community.nxp.com/thread/491022

Best regards,
Daniel

Re: Motor Control Class: Lecture 9 - Open Loop Control System

darrin_weiss — Tue, 22 Jan 2019 22:27:46 GMT

OK thank you dumitru-daniel.popa , progress! I now have the motor spinning and can connect with Freemaster after making the changes in the link above.

I want to mention that the connection of the motor phases that works on my system does not match the instructions. For me the following connections work (using a Linix 45ZWN24-40). I ran my own manual test using (A:White, B: Blue, C: Green) and observed the same hall states as implemented in the model, yet the motor performance was very poor until connecting as indicated below. I welcome comments/analysis on this observation.

Motor:

PHA : BLUE

PHB: GRN

PHC: WHT

Feedback:

1: Red

2: Black

3: White

4: Green

5: Blue