Pros and cons of Protool-Milwaukee brush and brushless screwdrivers

Hello, I'm a new user and I'm just learning. So correct me if something goes wrong. I wanted to analyze the advantages and disadvantages of brush and brushless screwdrivers as well as a comparison of selected models and advice on the purchase of appropriate equipment by reliable users. The models I would like to compare are the Protool 18-4 (brushless with electronic clutch) / Milwaukee M18 CDD or CPD (mechanical clutch) and DeWalt DCD985l2 (brush, mechanical clutch).
I mean universal use from what I was looking for on the internet brushless screwdrivers seem to have the same advantages (more power, longer battery life, no wearing out brushes and commutator). Marketing shows this tightly hiding the flaws, but on the forum I found one post in which the user writes:
Brushless motors in this type of power tool is a minor misunderstanding.
So far, they work well in devices that work at maximum revolutions and powers. In addition, strong magnets beautifully attract every magnetic particle and the housing has a beautiful crap.
In addition, they are much more expensive and it is easier to destroy such an engine on a construction site.
There is also the question of the clutch if the EC motor in the screwdrivers is so failure-free that the manufacturers indicate the colossal time of extending the operation of such a motor. Will the clutch live to a similar time? Is it a profitable business?
And most importantly, ELECTRONICS a lot of people on the forum write that it is a new technology and that it is underdeveloped, it often breaks down etc. grandfather and anything new is attacking right away, not backed up by wise arguments.
By writing nonsense, reliable arguments supported by knowledge and practice would be useful to help us all choose the right equipment for a given field and price range, other models of screwdrivers are also welcome.

One more issue of the clutch itself, comparing the two types of electronic and mechanical, and the advantages and disadvantages of such a solution

Buddy, I don't know what you are measuring at, but think about what you wrote in the context of my arguments:
- usually the first thing that falls in the screwdriver is the battery, is it worth buying a second or rather the next machine?
- even in market equipment, the transmission and the engine survive the battery many times
- the control of the commutator motor is very simple and rather reliable
- the brushless motor is undoubtedly more efficient and has a higher torque, especially in the low speed range
- with a brushless motor, you set the speed with a button, within the limit of reasonable loads, you have this constant value; With a commutator motor you set the average voltage value and the rotational speed is the result of the load
- due to the method of controlling the brushless motor, the regulator is a highly developed element (the need to use a processor, an extended power stage) and only the future will show how durable it is, will the repair be profitable in the event of a failure?
- is there a need for such a solution in your application (price)
- I do not think that I am attached to some solution and do not condemn others, here it is usually economic reasons that decide and these are the real realities of our beautiful country
- as for the clutch, with a brushless motor it is "sewn" into the regulator's program and rightly so because it gives more possibilities of shaping the tightening torque and simplifies the transmission, with a commutator motor the regulator is too simple to precisely adjust the torque and therefore mechanical clutches are used

small
You wrote
the brushless motor is indisputably more efficient and has a higher torque, especially in the low rev range
Are you sure?

If you want a good screwdriver then buy the HD18DD or the impact HD18PD.

Indestructible, 3-year warranty, the cost of brushes is all PLN 20.

Good indestructible
There is no such destructible power tool

monter8 wrote:

...
I mean universal use from what I was looking for on the internet brushless screwdrivers seem to have the same advantages (more power, longer battery life, no wearing brushes and commutator). Marketing shows this tightly hiding the flaws, but on the forum I found one post in which the user writes:
Brushless motors in this type of power tool is a minor misunderstanding.
So far, they work well in devices that work at maximum revolutions and powers. In addition, strong magnets beautifully attract every magnetic particle and the housing has a beautiful crap.
In addition, they are much more expensive and it is easier to destroy such an engine on a construction site.
There is also the issue of the clutch if the ec engine is so failure-free in the screwdrivers that the manufacturers indicate the colossal time of extending the operation of such an engine. Will the clutch live to a similar time? Is it a profitable business?
Well, and most importantly ELECTRONICS a lot of people on the forum write that it is a new technology and that it is not refined, it often breaks down, etc. with grandfather and anything new is immediately attacking without wise arguments.
By writing nonsense, reliable arguments supported by knowledge and practice would be useful to help us all choose the right equipment for a given field and price range, other models of screwdrivers are also welcome.

One more issue of the clutch itself, comparing the two types of electronic and mechanical, and the advantages and disadvantages of such a solution

In total, from what I noticed with screwdrivers with a commutator motor, the problems most often concern the commutator itself, because with higher loads and 1 pair of brushes, grooves appear in them quite quickly due not only to the brushes but to the teeth that were to improve contact and conductivity in this place . The brushes are similar in structure to those installed in automotive starters and sometimes their dimensions, and thus the contact surface with the commutator, are similar to those of two-track vehicles or small cars. The clearance in the brass rotor bushing will appear much faster.
In terms of magnets, in cordless power tools with a commutator, they are mounted on the stator and also attract filings. As for electronics, sentences can be divided because you also need to control the speed (some Hall sensor) and the issue of the current flowing in the stator windings at higher load and the parameters, method of assembly and heat dissipation from the transistors controlling the motor operation remains.

I have Ryobi equipment with a brushless motor, it has more power than the classic one, and the battery life is also much better. I use a lot and I can see the difference.

I have quite a lot of experience in working with professional power tools, but I have never had a brushless motor device in my hands (apart from a store). However, I would advise against buying such a tool in the case of unprofessional / occasional use due to the fact that I have a lot of experience in repairing other devices using brushless motors - they are practically indestructible - those that I replaced in my professional work, in one case the winding was damaged by an aggressive environment and Several dozen others it was a mistake of the manufacturer using an engine designed to work with a straight-tooth gear without a thrust bearing, used in work with a hypoid gear (with about 600 reports of drive failures per year) In over 90%, the failures were related to control systems / gear wear and it is not a problem if we have an integrated motor driver plus passive elements on the board, if the manufacturer of the power tool floods everything with resin apart from the heat sink, repairing such a tool after the warranty will become unprofitable. In other words, I would decide to buy brushless equipment if such a tool would earn for itself during the warranty period. Otherwise, I would advise you not to buy a cordless screwdriver at all, because spending about PLN 100 you can have a network Chinese with a double planetary reduction (two-speed) and I know a kitchen furniture installer who worked with such a screwdriver for three years without failing only by changing brushes - of course, you can not have with you everywhere extension cord - but we will gain an uninterrupted moment on the spindle and practically ready to work immediately.

małek wrote:

- As for the clutch, with a brushless motor, it is "sewn" into the program of the regulator, and very rightly so, because it gives more opportunities to shape the tightening torque and simplifies the gearbox. With a commutator motor, the regulator is too simple for precise torque control and therefore mechanical clutches are used.

In most brushless screwdrivers the clutch is mechanical, only expensive models from leading manufacturers are equipped with electronic clutches, such as Fein, Flex, Festool. I would add that the torque control in brushless motors gives us the opportunity to control it in order not to exceed the set setting - it is about not breaking the thread, for example. But this does not change the fact that the torque is best formed in mechanical gears anyway, and at all devices with a brushless motor are not simpler. An example of this would be the flagship Fein, Flex, Festool machines, which have a four-stage planetary gearbox. As far as I can tell, practically all screwdrivers on the market have a two-stage planetary gearbox, differing only in the number of gears (two - for the possibility of switching off one section of satellites and one for working all the time with a double set of satellites (¶ these are the cheapest models, usually no name). The only exception to what I wrote is Makita's brush model with three gears.