Electric Cylinders

Read here below the most frequent questions about electric cylinders.
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  • What is a linear actuator ?

    Many different devices are defined as “linear actuators”. All of them convert the rotary movement given by the motor into a linear movement, applied on the rod or on the saddle that moves the object. Be careful not to confuse the screw-jacks with the electric cylinders. Whatever could be its shape, the screw-jack (force multiplier), is based on the coupling between a motor and a screw; this coupling generates a liner movement. This happens both with trapezoidal acme screw or with ball screw, through a group “endless screw and gear”, with its incorporated reduction gear. The reduction values of this device can be very high, but its transmission efficiency is very low, about 0.3 overall, and having a running frequency usually about 30% of time.

  • What is an Electric Cylinder ?

    An electric cylinder, thanks to the motor which drives it, and to the electronic which controls it, is able to do all kinds of cycles, speeds, positionings and force controls, both in traction and in thrust. In the electric cylinder the ratio between motor and screw is 1:1 in the series having the motor in-line. it can rarely have higher ratio in the parallel motor series. The transmission efficiency of a well projected cylinder usually gets to 0.9, having a running frequency 100% of time.

  • What’s the difference between linear motorization and parallel one ?

    The cylinders having on line motorization mount the motor directly on the screw axle; the connection is obtained through a flexible coupling, better if in 3 parts. Main characteristic of the on line motorization is the total reliability and precision of the system, and, if well dimensioned, the capability to transmit very high torques, apart from the rpm. Of course the lenght dimensions are bigger; and being the motor placed on the backside cylinder head, it is almost impossible to mount the fixings on this side. The cylinders having parallel motorization mount the motor on the side of the cylinder and they are connected through a belt transmission device having ratio usually 1:1. The blocking is almost always obtained through splins and not through keys. The overall dimensions are smaller and it is possible to mount the fixings (hinges or others) on the backside. The power torque that can be transmitted is linked to the motor’s rpm and to the belt’s dimensions. It is necessary an accurate calculation of the safety coefficient of the belt. Due to evident reasons, the price of the parallel motorization is higher than the price of the linear one.

  • What are the motorizations available for an Electric Cylinder ?

    The electric cylinder usually gets installed “servomotors”: brushless, step, and, more rarely, DC motors.

  • What’s the maximum thrust an Electric Cylinder can achieve ?

    The thrust we can achieve, considering the type and the size of the cylinders, can get to about 10,000 N, always depending on the static and dynamic loads of the installed screw nuts.

  • What’s its maximum speed ?

    The maximum speed an electric cylinder can achieve depends on the type of screw (trapezoidal or ball screw), on its pitch, and on the motor: from 0.1 rpm to 8,000 rpm.

  • How many cycles an Electric Cylinder can make?

    The electric cylinder, if properly projected and dimensioned, can make hundreds of millions of cycles. Anyway we have always to keep in mind that the electric cylinder is a mechanic object needing constant maintenance, as indicated in the technical sheets and maintenance manuals.

  • In which applications it is recommendable to use an Electric Cylinder of the Economic series?

    The Economic Series (with trapezoidal screw) can be used when the working speed, the cycles number for minute and the requested precision are not too high. The Economic series, despite its name, is an optimim cylinder and must be always taken into consideration.

  • In which applications is it recommendable to use an Electric Cylinder of Lightened series ?

    The Lightened series (ball screw, for small and medium weights) can be used when the working speed, the cycles number for minute, and the requested precision, are more important. In particular, when the requested precision of the final positioning is less than 0.1 mm, or the working cycles are quite high, more than 5 or 6 per minute.

  • in which applications is it recommendable to use an Electric Cylinder of the Heavy-Duty series?

    The cylinders of the Heavy Duty Series are recommended, instead of Regular Series ones (ball screw, for medium and heavy weights), when it is necessary to increase the mechanical resistance to kickbacks or to unknown / uncontrolled load peaks. The main constructive difference, if compared to the Regular Series ones, regards the bearings bench (please see their differences in our catalogue).

  • in which applications is it recommendable to use an Electric Cylinder with flexible shaft transmission motor drive ?

    The use of the flexible shaft transmission motor driving electric cylinders (of whatever Series) is reccomandable when the placing of the motor in the same enviroment of the cylinder is problematic or dangerous. Keep in mind that sometimes some applications could be impossible to be obtained. The max length of the flexible shafts is 4 meters.

  • What does distingush Eurosei Electric Cylinders from the other ones available on the market?

    Eurosei cylinders are different from all others cylinders on the market because of some peculiar constructive solutions which increase the mechanical characteristics and applications, offering a better and longer reliability. Furhermore, Eurosei is the only Company offering many series of cylinders for the same size; this allows to improve the performancies reducing the costs, satisfying the real needs of the endusers.

  • Is it possible to have any special cylinder?

    It is possible to manufacture in quite short time special cylinders in terms of stroke, in terms of paticular features, or particular shapes.

  • In which applications is it recommendable to use an Electric Cylinder ?

    Electric Cylinders are recommended every time pneumatic or hydraulic cylinders cannot be used, due to the required performancies: when during the working stroke one or more intermediate positions are requested, when compressed air is not available, when the repeatability of certain operations (speed or position) must be granted whatever is the weight to be moved, whatever is the temperature, and whatever is the technical skill of the operator. Electric cylinders are also recommended when the dimensions are relevant and when the power consumption is an important feature.

  • How much does an Electric Cylinder cost?

    The price of an Electric Cylinder is usually higher then the price of a pneumatic one and it is similar to the price of an hydraulic cylinder. Anyway what really makes the difference is not the price itself, but the capability to solve a problem in applications otherwise impossible.

  • Is it true that the Electric Cylinders have the lower specific power consumption ?

    It  has actually been proved in several studies that electric cylinders has to be considered the cheapest choice in terms of power consumption; specially when the single operation's cost is very little. There are some situations in which the operation cost, using hydraulic cylinders, becomes higher than the value generated from the operation itself.


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