Motor Control From Scratch - Part5 | DQ-model of PMSM motor & Understanding Torque Equation
ฝัง
- เผยแพร่เมื่อ 17 พ.ค. 2024
- #ElectricVehicle #MotorControl
In this video, we will derive the dq model of PMSM motor. This will help us in simulating field-oriented control (FOC) in the next video. The equations we learn here will help us analyze the control dynamics well. Then, we will look at the torque equation in dq form and understand its implications.
If you like the content, please consider subscribing.
This is part 5 of the series - Motor Control From Scratch.
Check out this playlist for other videos in this series:
• Motor Control From Scr...
You can get the free trial of MATLAB (Motor Control Blockset) from here:
in.mathworks.com/products/mot...
To learn MATLAB and Simulink, check out their tutorial videos:
matlabacademy.mathworks.com/?...
To understand why synchronous inductance is 3L/2 - check out Appendix B of this thesis:
krex.kstate.edu/dspace/bitstr...
--
0:00 : Deriving Motor Model
6:00 : Understanding Torque Equation
9:00 : Summary
--
Disclaimer:
This video is for educational purposes only. Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational, or personal use tips the balance in favor of fair use. - วิทยาศาสตร์และเทคโนโลยี
If you have any questions, leave them over here and Thanks for the support you'll have shown.
This applies for PMSM motor or all motors?
These exact equations do not hold true for all the motors. But the idea remains the same. You write the KVL equation for the three-phases in ABC form and then apply Clarke and Park Transform to get the equation in DQ quantities.
@@thesubcooledmind7910 what about single phase PM synchronous motor, can you guide me please
Hi, You did not use Ld and Lq in the equation for DQ, You simply use Ls. I think it is wrong. How can we convert Ls into Ld and Lq? Please let me know about it.
can you please make a video on sensorless algorithm
Thank you for creating this great series. Happy to have found it, looking forward to the next episodes!
Sir, in the video u said Ls (Synchronous Inductance). What is the formula to calculate it?
crystal clear explanation sir, I request you to upload more videos.
Straight to the point very helpful. Thank-you!
Good job. Clear explanation. Perfect visuals. I'll recommend this playlist to my friends. You're awesome. Please keep going and continue making more informative videos.
I am doing a PMSM FOC experiment, but I am not sure how can i calculate my angle theta and how to give the phase current in an aligned position?
Thank you for the videos, the content is really good, looking forward for more content.
Thank You Sir
Great video sir! Keep up your good work!!
an you please tell me from which literature you took out the equations?
I am trying to model outer rotor PMSM in SImulink. Can we use the same equations and simulink PMSM blocks (from Simscape Electrical ) to implement this, or do we need to make it some changes to it?
Hi, really a great explanation! Can you please tell me from which literature you took out the equations? I would need the literature to cite it in my thesis...
Excellent work. People like you make youtube have quality content :)
Thanks 😀
Sir you are great..these videos help me a lot..Thank you very much sir❤
Good explanation..thanks
I'm glad I started working in electric vehicle domain in 2020, otherwise, I had to understand so many things which you explain so simply.
That's great, which company you work for?
Hello sir, can you please guide me how can we do precise position calculation for pmsm motor with hall sensor. ?
It depends on where the hall sensor is placed. There are quite a few magnetic position sensors available that attach a magnet to the shaft of the sensor and get precise position information. For example, check out this IC from Infineon - www.infineon.com/cms/en/product/sensor/magnetic-sensors/magnetic-position-sensors/angle-sensors/tle5501-e0001/
How will you select your DC link voltage of you are going for DTC? Any idea. (For a motor rated at 48v).
Thank you for the clear video. Could you please share the calculations for phase currents to d,q frame at 4:22 to 4:33 please?
Very good
Nice video
How mutual inductance is L/2 ?
Hi, You did not use Ld and Lq in the equation for DQ, You simply use Ls. I think it is wrong. How can we convert Ls into Ld and Lq? Please let me know about it.
great video, accent is the challenge
Hello, I got two questions.
Isn't it better to describe model of motor (both electric and mechanical part) by one big plant with state space? Or it's rather better to split in 2 models?
And one more, I am not sure, how we can estimate rotor's position by only measuring back-EMF. Did i understand it properly (when we know, back-EMF is perpendicular to rotor flux and from that we can determine theta?) Please correct me if I am wrong.
Thanks for answer and by the way, this series is great and I really enjoy watching it. Keep doing it bro.
1. Whatever approach you take, the equations for the model remains the same and so the output. Model it the way you are comfortable with.
2. Yes, your understanding is correct. Since, back-emf is perpendicular to the rotor flux - you can know the rotor position. To understand it in-depth, please look at some documents on sensorless FOC.
Thanks. I am glad that you have enjoyed watching these videos. Happy Learning!
Can you provide more details on how to calculate motor angle.
In practise if we use a PMSM motor can we always assume that Ld=Lq? so is mtpa for pmsm just a straight line on the q axis?
I understand that it is important for IPMSM but I'm not sure if i should care about this for PMSM.
Yes. Everything you said is correct.
If you have PMSM motor in hand, how to find it is alligned to phase A or 90 degrees apart. Which simulation model need to be considered, before going for hardware test.
When you give +ve DC supply to phase A and connect phase B and phase C to GND, the rotor aligns with phase A. You can use this information to tune your encoder.
@@thesubcooledmind7910 that means we must need absolute encoder right? or is it possible with inc encoder. if so, please provide
Incremental Encoder should work. I do not remember the details but you can check out some documents from TI.
Then what would be the id ref in a salient machine?
The id_ref is usually set by MTPA algorithm. I will be covering that in future videos.
Could you please give source for Vd and Vq equations
This thesis will help you - krex.k-state.edu/dspace/bitstream/2097/1507/1/JamesMevey2009.pdf