Servo Electric Cylinder vs. Hydraulic Cylinder vs. Pneumatic Cylinder – Performance Comparison

1. Components

Actuators

From the perspective of actuator components, pneumatic systems primarily rely on solenoid valves, filters, pressure regulators, and other elements working in tandem with cylinders. Their power source is an air compressor, and the cost per axis is relatively low. In contrast, each axis in an electric cylinder system requires a servo drive as the power output unit. In this regard, the hardware cost of servo electric cylinders and drive systems is clearly higher.

Control Devices

In terms of control components, both pneumatic and electric cylinder servo systems require PLCs or other controllers. Pneumatic systems use relays to control solenoid valves, and additional sensors are needed for complex motion control. Electric cylinder systems, however, can achieve various motion functions directly through servo drives without requiring extra control components.

2. System Design

Hardware

Pneumatic systems involve more components, making the system more complex, which results in higher hardware design time and costs. Electric cylinder systems, on the other hand, have a much simpler structure—consisting only of the cylinder, drive, and controller—making hardware integration easier.

Software

From an application standpoint, it is difficult to distinguish a clear gap between the two, as this heavily depends on the specific use case.

3. System Assembly

Mechanical Assembly

Pneumatic systems require more installation effort due to the greater number of components involved. Besides installing cylinders, workers must also mount solenoid valves, filters, pressure regulators, and sometimes sensors. With electric cylinders, only the cylinder itself needs to be installed (the rod attachments are the same as traditional cylinders), and power/feedback connections are made via plug-and-play cables to the drive.

Wiring

Pneumatic systems require wiring for solenoid valves, valve manifolds, and air supply lines. If position feedback is needed, additional sensor wiring is necessary. Electric cylinder systems only require motor power and feedback cables.

Control Cabinet

Additionally, the cabinet integration cost for pneumatic systems is slightly higher due to the variety of components, whereas electric cylinder cabinets only need standard servo drives.

4. Production & Operation

The most significant difference in production and operation lies in energy consumption costs. As previously mentioned, pneumatic cylinders rely on compressed air as an intermediate medium, and air leakage during operation reduces energy efficiency. Electric cylinders, however, directly convert electrical energy into mechanical motion, resulting in higher energy efficiency.

Energy cost calculations can be referenced as follows:

• Pneumatic cylinder energy cost = Compressed air consumption per cycle × Number of cycles × Cost per unit of compressed air

• Electric cylinder energy cost = Power consumption per cycle × Number of cycles × Electricity cost per unit