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Cordless wrench with 20V/4Ah battery and brushless motor

All is well with ventilation: Forward rotation – switching between the first and second speeds of rotation (and, accordingly, the strength of the impulse).
In addition, the rear side of the wrench is also protected with rubber to avoid damage to the body and internals when falling. I would like to emphasize that a “brushless” (brushless) motor (and, in a correct way, “valve”) is installed in the wrench. — fastening for unloading (or belt),
The gearbox casing is made of metal: The absence of a commutator-brush assembly (the one that sparks, makes noise, reduces efficiency and needs regular maintenance and replacement) gives the following advantages: Reverse rotation – switching between continuous unscrewing mode and stop rotation mode after unscrewing the nut.
The bag is good and durable, I like this kind of packaging of tools more than bulky plastic cases: ¤ cam chuck with an adapter and a key, The bag:
The Chinese combined a friction ring in the fitting, which ensures a quick change of heads and also added a hole, which allows the installation of interchangeable cartridges (included in the kit): Nutdriver: In this mode, the wrench, after unscrewing the nut, performs a few more turns of the head and, on its own, stops the rotation, thereby leaving the nut “baited” on the bolt or stud. It is very convenient and useful so as not to accidentally lose the nut (which can pop out of the head and fall into no one knows where) and carefully unscrew it by hand. – Higher efficiency indicators due to the absence of losses on the sliding contact of the brushes and the collector, respectively, more power and less consumption. — They can work in aggressive and explosive environments, with high humidity. – belt, Glows just below the place of work: The tool is made very well, the plastic molding is good, the handle is finished with rubber anti-slip inserts on both sides: Hence the name "valve" – ​​controlled by valves (electronic keys = transistors).
— wrench, In English, "Brushless Direct Current motor" or https://jiji.co.ke/cars/bmw-535i BLDC motor (literally "brushless DC motor"). Component size:

Not so long ago I did a review on a Chinese cordless grinder, which has been working for me for the third month and, unexpectedly, turned out to be one of the most useful tools, despite the non-standard size of cutting discs for us (which I , nevertheless, I found it on sale in the OBI construction market).
In essence, this is a familiar DC motor turned inside out. The principle of operation of a brushless motor (right) in comparison with a standard brushed motor (left): However, of course, the use of the tool is much wider, the impulse motor of the apparatus allows you to unscrew even very tightly tightened, soured and rusted nuts. — battery 20V/4Ah, Modes: So let’s get started. – They carry a large load in terms of moment.
There are six indicator windows in total: three in the center in a column, it is clear that they show the remaining battery charge.

Three-position switch for the direction of rotation with a middle position that blocks the pull of the trigger:
Existing variants of this element: It has a built-in charge indicator: — additional interchangeable attachments that allow you to make a screwdriver or a drill out of a wrench: Equally powerful in any direction of rotation.
Place for installing a complete mount for unloading or belt, battery seat , fall protection: – bag .
Inside: Comparison of the dimensions of a brushless (left) and conventional brushed DC motor:
¤ hex shank chuck (drills and bits), The magnets move to the rotor, and the windings move to the stator.
Source: _http://www.toolgir.ru/tehnologii-instrumenta-milwaukee-fuel/
Complete set : The literate name of engines of this type in Russian is "valve engine". The seller has several tool kits, the price depends on the type of tool.
There is a platform with a button and indicators above the battery: You can order from a simple "naked carcass" (without everything) to a complete set with a bag, two batteries and additional accessories.
Under it there is a backlight LED, with a turn-off delay (the backlight works for another 5 seconds after the head stops rotating): Continuing the theme of a cordless tool from the Middle Kingdom, this time a powerful brushless wrench with a large battery. —Less noise, less heat, and
virtually no radio interference.
It’s funny that on the tool the indicator has three divisions indicating the battery charge, and on the battery itself there are four windows 🙂
Characteristics: — A simpler and more compact engine design (at least shorter by the thickness of the manifold assembly). — A wide range of rotation speed adjustment (if desired, you can literally “turn” it into a stepper motor). — charger, And the other two dots indicate the mode is on, it is switched by the button. Although not quite correct, but a common and already established option is the “brushless motor” (you have to use it), sometimes the “brushless motor” is used. In the household, such a tool is usually most in demand during a seasonal change of wheels, when winter comes unexpectedly, prices in tire shops skyrocket (even for a simple change of shoes, without rubber overturning), and you can easily stand in line for three or four hours.
The inclusion of this mode is indicated by a dot (only works in unscrewing mode): – The life of the motor is ideally limited only by the life of the bearings. The brush-collector assembly responsible for switching the windings is replaced by electronics – one or more sensors are installed on the rotor that track its position (usually Hall sensors), and the controller, based on this data, applies voltage to the winding that is currently needed, creating a change in fields and rotation .

Cordless wrench with 20V/4Ah battery and brushless motor

Now I suggest you read about the wrench. < /p>
An interesting landing fitting, which has the most common size in our country – 1/2":

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