To select the right size for the electric actuator, the load cycle is key. It is important to differentiate static and dynamic forces. Dynamic forces occur when the actuator is moving (e.g. extending or retracting). Static forces may occur when the actuator is not moving. These forces are externally introduced. The dynamic force is divided in a maximum and mean square force [Fm]. The mean square force over the load cycle serves as the input for calculating the theoretical lifetime of the screw.

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The EMA requires greasing to increase the lifetime of the components and to maintain the efficiency level. The advantage of grease lubrication is that screw assemblies can run for prolonged periods without needing relubrication. The axial bearings are greased for life and internally sealed, therefore they do not require relubrication. When relubricating the actuator please note the recommendations in our datasheet.

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An electric actuator is a stiff construction element. Therefore, in some applications, the actuator can be equipped with a shock absorbing mechanism. E.g. in civil applications, it is required to apply an overload protection according to DIN19704-2:2014. If a shock absorber is not selected, while an application requires one, this could result in damage to the actuator or external structure due to overload. The function of the shock absorber can partly be compared to a pressure relief valve in a hydraulic system. In contrast to a hydraulic relief valve function, the “shock absorbing” stroke length is limited.

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To control your application position switches can be set in the drive software (MLD) using the optional encoder, refer to page 19 in the datasheet. Since the encoder is an absolute device, mechanically connected to the screw. Multiple software switch points can be configured. In the example shown in the datasheet page 22, four software position switches are configured, two lubrication positions and two end (limit) positions for extended and retracted position of the actuator.   

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Optionally the electric actuator is equipped with a multi-turn absolute encoder. The encoder is mounted on the back of the gearbox, mechanically connected to the screw. With the encoder the linear position of the rod can be measured as there is a direct correlation between rotations and linear movement.

An electric actuator has the option to apply manual operation. This allows movement of the actuator in case of power failure. The manual operation option is attached to the back of the electric motor. It consists of a crank with handle, mounting plate and switch.

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The stroke determines the length of the actuator and the screw. The maximum possible length of the screw limits the stroke. The stroke can limit the maximum compressive force of the actuator due to buckling. Besides buckling, the stroke can also limit the maximum linear velocity of the actuator because of centrifugal forces on the screw.