Did you know, that a starter is a pretty complicated mechanical assembly? I know now :D
Look at the images, there are a lot of details! :)
Yeah, I've seen this 👍🏼
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Alexander has gone to great lengths to detail all the internal components. That was the purpose of his model and this post. Where are the internals for your model?
An industrial servo motor like this is designed for a completely different application and environment. It would require many supplemental mechanical and electrical components to make it even possible to use as a starter motor. And even then, it would wind up doing a very poor job because it wasn’t designed for the task. It would likely fail in a very short period of time because of the vibration and heat.
They make starter motors the way they do because of the task they are required to perform. They are self contained with all required components, and are quite durable in an extremely hostile environment.
 I'm not saying the motor you specified isn't a great motor. It probably is. Using a starter motor in a place where this servo motor would normally be used would also be a terrible mistake. Starter motors are designed for extreme torque and extremely short duty cycle operations. Whereas most servo motors are designed for continuous duty at their moderately rated torque.
Kudos to a job well done. The detail you have included is extraordinary.
Very much appreciated, Bob!
As you mentioned in your comments, of course the servo motor is a completely different application.
Of course there are much better solutions on the market, especially concerning the durability and power for start-stop systems. The hitachi starter is round about 30 years old and my aim was primary to show the great engineering behind the old design!
i NOT AGREE.
WAS ONLY A PROPOSAL.
IS MUCH BETTER SOLUTION FOR HEAT DISSIPATION.
THE CONTROLLER COSTS LITTLE MORE BUT IS MUCH BETTER FOR THE
ARE USED BY TO..TA ON HYBRID SYSTEMS CONTROL.
See the edit to my answer above. I'm sure the servo motor you specified is a good one. Whether it might be used as an engine starter is irrelevant to the topic of discussion. I apologize to Alexander for chasing that squirrel.
I believe you have missed the whole point of Alexander's original post. It was to showcase the internal detail of one particular starter motor that he painstakingly disassembled and measured. Whether there have been technological improvements or replacements since that particular model was produced might be interesting. In my humble opinion, to be relevant we should probably discuss actual proven starter motor technology rather than unrelated industrial motors designed for automation.
To stay at the topic of the thread I show you a video from Mahle where they show their current generation of starters. It's a great animation and you can see the similarity to the old starter I designed. There is not a lot of changes inside, surprisingly:
What's interesting is even with modern systems that automatically start and stop the engine when stopped at stop-lights, They still use the same basic starter setup. They are optimized with enhanced wear components but they still use the basic brushed DC motor, solenoid and Bendix arrangement. There are a very few systems that use hybrid motor/generator technology that's essentially engaged full time. However for vehicles that are purely Internal combustion powered, they still use the old system.
Agreed, that's also my state of teh knowledge: The start-stop systems just use a reinforced "classical" starter. It is optimized in terms of power (engine has to start quicker), heat-resistance (modern turbo-engines are much hotter) and wear due to the higher amount of start-cycles. But anyway automotive managers "don't like to pay high prices", so the good old design has been kept until today.
Van wrote about hybrid systems. Here the engine-gearbox assembly are much more complicated than the classic one. A classic starter is not needed anymore since there is at least one electrical machine which is often able to whether start the engine and/or move the vehicle at lower speeds where you can start the engine by using the kinetic energy.
The possibilities to arrange the engine/gearbox/electrical machine(s) are nearly limitless. One of the established hybrid drive trains is the toyota prius which is so simple but works since decades!
Yes, when building thousand of vehicles, cost is the primary factor for something like a starter motor. A few cents saved here and there add up to huge profits in the end. While something like a servo motor might do the job more efficiently, and possibly more effectively, its cost just can’t be justified.
Newer starters have incorporated a planetary gearbox like the one in the video you shared. I’m sure that’s because the cost of gearbox is offset by the smaller DC motor and associated copper savings. The DC motor is still basically the same design. Just smaller, with a lower torque and higher RPM.
I’m surprised we haven’t seen a device (servo motor?) that combines the functions of the alternator and the starter in every vehicle. Making the stop start functions much more seamless and also reducing component counts for some real cost savings. It could essentially turn every vehicle into a hybrid to some degree.
Let me say :
Principal startter engine producer in the world: