In general, electric servo drives are more expensive than pneumatic servo drives, but they are also subject to specific requirements and occasions. Some low-power DC motors make up an electric slide (electric servo system) that is actually cheaper than a pneumatic servo system.
Such as: when the load is 1.5kg, the working stroke is 80mm, the speed is between 2~170mm/s, the precision is ¡ FESTO uses an electric servo system consisting of a small electric slide, a controller, a motor cable, a control cable, a programming cable, and a power cable at a working condition of 0.1 mm and an acceleration of 2.5 m/s2. The price is higher than that of a pneumatic servo system. 25% cheaper. The same is true for cylinders with piston rods. It should be noted that if an AC motor is used, the price of the composed electric servo system is about 40% higher than that of the pneumatic servo system.
From the point of view of the cost of purchase and application, the current cylinder still has obvious advantages. For the pneumatic system, the control system and the actuator are very simple. Each cylinder only needs to be equipped with a solenoid valve to complete the switching of the gas path, and the motion control is performed. The probability of the cylinder failure is relatively small, the maintenance is simple and convenient, and the cost is low. Also low.
For the electric actuator, although the electric energy is relatively simple to obtain and the energy cost is low, the purchase and application cost are high, and not only the motor needs to be configured, but also a mechanical transmission mechanism and corresponding driving components are needed. At the same time, the use of electric actuators requires a lot of protection measures. Wrong circuit connections, voltage fluctuations and overloading of the load can cause damage to the electric drive. Therefore, it is necessary to install a protection system on the circuit and the machine, which adds a lot of extra expenses. In addition, since the electric actuator drive unit has a large number of parameterization settings and a high degree of integration, in the event of a failure, the entire component is replaced. Moreover, when the driving force required by the system increases, it is also necessary to replace the components in a complete set. Therefore, the comprehensive comparison shows that the cylinder has a big advantage in the purchase and maintenance costs.