LTSpice Tutorial - Modeling a DC brushed motor

#32 #ltspice
In this tutorial video I take a swing at modeling an electro-mechanical component in LTspice - the standard DC brushed motor. For a component so basic and common its actually quite complex in its operation. But that just makes the challenge of modeling it more fun! Hope you enjoy it as much as I did.

Please check out also these relevant links mentioned in the video:

ElectroBoom's DC motor video:
Website about motor spice modeling:
Spice files:

If you liked this video be sure to check out my other videos and you can also subscribe to be up to date with all the new ones!

Tutorial series
EP1-Getting started:
EP2-AC simulation and the Baxandall tone control circuit:
EP4-How to import libraries and component models:
Ep5- Stock example simulations to play with:
Ep6- Basics of FFT analysis and .four statment:
EP7- Dependent voltage and current sources
Ep8- Turning a datasheet into a component model
EP9- Independent voltage and current sources
Ep10- .wave statement and audio file processing
Ep11 The effect of temperature on your circuit
EP12 Modeling a DC brushed motor
Ep13- Worst Case, Monte Carlo and Gaussian statistics circuit analysis
EP15- SMPS EMI and electrical noise and filters
EP16- Feedback loop simulation
Ep17 - Verifying Simulation Models
Ep18 - Simulating Capacitors
Ep 19 - Simulating Inductors
EP 20 - Noise simulations
Ep21 - Models and Libraries

Music:
Creative Commons — Attribution 3.0 Unported — CC BY 3.0

[kieranj]

Absolutely amazing, thank you!. Analog Devices / Linear Tech should kidnap you and have you do all their tutorials & content creation. The channel, The Signal Path was my ultimate favorite channel, now I have two ultimate favorite channels, thanks again!!!

[rahulsutradhar]

The best ltspice tutorial playlist as far as I know❤️

[shahzaibshamim]

The guy with an outstanding skills on LTSpice!

[rohitchaturvedi]

Please keep making these videos, these are gold.

[plinsburg]

It's great the you've shared the model. Very useful, thank you.

[machineability]

Thank you for sharing this work. Well done!

[butterfly]

Great video as always.
For the viewers out there that are in need of a little fun I propose a drinking game. Each time Fesz is saying the word 'so' you drink. I wonder how many of you can last until the end of the video :)))

[DoctorMangler]

Another great video, I really wanted to do this and I wasn't sure where to begin. Thanks a ton!

[modddjo]

multumim prietene foarte detaliat si precis.

[bertoid]

This is brilliant! I find your knowledge of LTSpice and ability to engineer reality into it astounding.
I'm not sure I would call it simple though, it looks pretty complex to me!

But I suspect that you may have made an invalid assumption:-
You said there is a moment when no coil is connected as the brushes cross over the small gap in the commutator. But in reality I expect that for that short moment, there are TWO coils connected to the supply, as the brush touches both contacts. Imagine a larger motor with carbon brushes, which are much wider than the gap between contacts, where this would be even more pronounced.
Do you agree? Does this affect your model?

Can you/have you considered folding the complexity of this model into a simply used general component that can be dropped into any LTSpice circuit?
Maybe that is so simple as to not be worth mentioning, but I certainly have no clue about how to do it.

I found this video because I wanted to play with simulating control of universal motors (eg: electric drill). In that case, the permanent magnets are replaced by field coils in the stator, which are in series with the rotor and brushes. I imagine that adding that aspect to the model would be easy (for you, not me!).

[ThanhNguyen-opeb]

can I use the timer 555 to replace your VCO circuit ? Is it possible ? Because I found it easy to implement and more understandable.

[misteredron]

hi FesZ I could not download your model on google drive.. :(

[jorgerive]

This was a great video. Well done, and thank you. Any chance you might work through a BLDC motor model?

[EVAECHO]

Hi, how can one find out the motor inductance and the motor inertial from the motor data sheet? Any tips? Thanks.

[nunobrum]

Nice explanation.
I was wondering about simulating actually the three coils each with it's own EMF loop. What do you think about this approach?
Any advises against it (ex: simulation convergency...speed, etc...)
The reason for this is that I would like to have in the simulation the amount of dV/dt generated by te coil commutation and how it affects the coils adjacent to it. I mean, I guess there is some energy passed by one coil to the other.
Would like to have your comments on this.
Thanks again for the nice video.

[zoshieee]

Hello, The video is amazing, Could you please explain how to make a model for BLDC motor

[ashishj]

Hi, I think there is a small errror in schematic: Source B11 should be I(B7) and label B10 should be changed to B11. Then B14, B15, B16 should point to label B11

[jonnordstrom]

What a great presentation. I have been looking for a good motor model recently and yours is the best I've found. Would it be possible to send me the.asc file to try? Thanks

[pratosh]

How easily can a BLDC motor be modeled !?

[sewingmachinesindetail]

Thank you for a very well explained simulation of DC motors. What is the motor inductance and resistance that matched your motor? I like to estimate the typical L/R time constant of DC motors.