The results of our study show that in horizontal reciprocating motions with short reciprocating cycles (less than 1 min), the operating energy consumption of electric actuators is usually lower than the operating energy consumption of the cylinders, ie more energy efficient. When the reciprocating cycle is long (greater than 1 min), the cylinder becomes more energy efficient. This is firstly because the controller of the electric actuator usually needs to consume about 10W of power when the terminal is stopped, and the cylinder only has solenoid valve power consumption and gas leakage, generally less than 1W, that is, the longer the terminal stop time is, the more advantageous it is to the cylinder; Secondly, the rated efficiency of the motor under continuous rotation conditions can reach more than 90%, but the average efficiency under the table-shaped acceleration/deceleration rotation condition in linear reciprocating motion (screw conversion) is less than 50%. In the vertical reciprocating motion, the holding action of the clamping workpiece requires continuous supply of current to the electric actuator to overcome the gravity, and the cylinder only needs to close the solenoid valve and consume less electrode. Therefore, the electric energy consumption of the electric actuator is not very large compared to the cylinder in the vertical reciprocating motion.
It can be seen from the above that the motor itself is very efficient, but considering the efficiency drop and the power consumption of the controller in the reciprocating linear motion, the electric actuator does not necessarily have to be more energy-efficient than the cylinder. The specific comparison depends on the actual working conditions, ie the installation direction, reciprocating Movement cycle and load rate, etc.