Advantages And Disadvantages Of Each Type Of Dynamometer

One of the most unknown aspects of dynamometers is the wide variety of products on the market. It is true that many of them are aimed at more industrial users, but this does not prevent us from knowing the advantages and disadvantages of each of them.

Having the necessary tool for the task we are doing is essential. Something that applies to small tools such as screwdrivers, but also to larger ones such as dynamometers. A segment in which, compared to what it may seem, there is a great variety of products to turn to, depending on what we want to do at all times. So that you have more information about each of them when choosing which is the best dynamometer for your workshop, we are going to take a look at the most common dynamometers and what are their advantages and disadvantages.

Analog dynamometers

The first model that we are going to analyze is the analog dynamometer, in which the spring itself indicates the corresponding force measure. These models have the advantage of being economically priced and of being offered in different sizes and capacities. On the side of the disadvantages we find some such as the fact that their scales are usually scarce and are not usually the most suitable for large loads. Something to which it does not help that the product has to be normally fastened by the user or fastened to the wall or ceiling. All this without forgetting the lower precision of this analogue system when it comes to giving us the measurement carried out.

Digital dynamometers

In the case of digital dynamometers, we forget the torsion spring as a reference element, seeing it replaced by a complete digital display. Something that makes the measured values ​​much easier to see and that has the additional advantage of adding more precision to them, according to the number of decimal places that the screen includes.

Aside from the inconveniences, the limitation of the scale is still maintained, which, although it is larger than in analog models, can continue to fall short for cases in which we have to make measurements of large weights or forces. However, the wide variety of models available makes it easier to choose the precise model.

Hydraulic dynamometers

We make the leap into the world of industrial dynamometers, starting with hydraulic models. These have a complete operating and cooling system with which it is possible to run tests and trials at high speed levels with low inertia and for a long time, at least as long as the cooling system is able to withstand the process.

This is precisely one of the main drawbacks of this system, which requires a significant investment in that cooling system. Something that involves the installation of water tanks, pumps and cooling elements. This liquid also intervenes in braking, so that when measuring torque, the coolant can generate alterations in the results, which must be taken into account. Some aspects that also generate a greater need for maintenance than other models, due to having to take care of the refrigeration part.

Electric eddy current dynamometers (Eddy)

Eddy-type dynamometers or eddy current electric dynamometers are an alternative to hydraulic models, having as main advantage the high level of torque for braking even at very low revolutions. Something that allows a high level of control precision regardless of the rate of rotation or torque we are using. On the other hand, except in the models that are air-cooled, it is possible to have an independent brake control, since in the water-cooled models it is easier to manage said braking. As the last advantages of these models we find a high resistance and a simpler and less expensive maintenance, especially in the air-cooled models.

On the disadvantage side we have the cost, which is increased more in the water-cooled models, due to the additional installation required. With respect to air-cooled models, the time during which full power braking can be used is reduced, and a lower speed must be used just after, depending on the dynamometer’s ability to dissipate heat.

Electric dynamometers

Electric dynamometers, whether of alternating or direct current, have the same advantages as the Eddy models that we have just mentioned, also having less inertia. Something to which is added the possibility of using them also as an engine for testing transmissions and other passive elements. On the cons side we find greater inertia than in a mechanical model, considerable product and controller cost and limited power capacity, so they are not suitable for tests or demands of very high operating power.

Inertial dynamometers

As the last featured model we are going to analyze the inertial dynamometers. These models are the simplest of all those that we have discussed in the industrial segment, which has several advantages. One of them is their low cost and low maintenance, so they are highly recommended for simple tasks. They are also easier to manage and control than the more complex models, so if you don’t have great needs this is all you need.

On the inconvenience side, we find problems such as the need for a good processing system to achieve adequate results. It is also necessary to know that this model always offers the same load and that it depends on the acceleration. Something that prevents, for example, that they can perform stabilized load tests. Finally, it should be remembered that these models also have lower accuracy, mainly due to the presence of external elements that cannot be measured during use, as well as the inertia of other rotating elements.

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