Servomech

®

1.4TECHNICAL FEATURES

The performance tables show the main technical features and performance characteristics for eachtype of actuator.They are ideal for quick reference when requiring specific details for control applications in positioningand speed. GENERAL FEATURES: Rod diameter = external diameter of the driving rod Protective tube diameter = external diameter of the outer protective tube Motor flange = European standard IEC B14 or B5 frame size Max. dynamic load. = max. load that the specific actuator size can lift. The max. load is achieved with low speeds, which means slow ratio (RL). When increasing the speed the load isreduced, because the actuator has the same motor and therefore a constant power. Max. push or pull load = max. push or pull load admitted when the actuator is in industrial still position. Generally the max. push load is higher than the max. pull load due to the biggermechanical resistance of the fixing parts on housing side. The max. push loaddepends on the stroke length (refer to graphs on page 18). Ratio = Exact ratio of the driving gears between electric motor and linear leadscrew. Linear travel for 1 input shaft turn = linear travel in mm performed by the actuator for each input shaft turn. This information is useful when the actuator is equipped with encodermounted on the input shaft to quantify the total number of pulses for the requiredlinear travel. Example:encoder 100 pulses per revolutiontravel for 1 input shaft turn = 0,25 mm result: 400 pulses for 1 mm travel Weight = mass in kg referred to actuators of 100 mm stroke length without motor. The total weight of an actuator can be obtained adding to the given weight for 100 mm stroke,the weight increment for each further increase of 100 mm stroke.The weight of the motor is stated in tables on pages 100-104. ACME SCREW LINEAR ACTUATORS FEATURES: 1-start acme screw = acme screw external diameter and lead of the trapezoidal thread in [mm]. The lead gives the actuator feed or travel in mm for each acme screw turn, i.e. foreach turn of the wheel leaded by the driving gear. 2-starts acme screw = acme screw external diameter and effective lead of the trapezoidal thread in [mm]. The effective lead gives the actuator feed or travel in mm for each input turnof the acme screw. The value in brackets states the pitch between the two contiguous threads. BALL SCREW LINEAR ACTUATORS FEATURES: Diameter
× pitch = ball screw external diameter and thread lead in [mm]. Dynamic load C = max. operating load admitted on the nut. The max. load values acceptable on the ball nut are also necessary for the nut lifetime calculation. Static load C
= max. static push or pull load admitted on the nut. The max. load values admitted on the ball nut cannot be considered as performances valuesachievable by the actuator, because the real performances depend on the motor power and on the actuator components strength. Ball circuits quantity = is the total number of ball complete circuits under load.
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