Electric Actuators Designed to Replace Fluid Power Systems: A Practical Industrial Automation Guide

For decades, pneumatic cylinders and hydraulic actuators have dominated industrial motion control. Their popularity stems from simple control methods, robust force output, and straightforward installation. A valve energizes, fluid moves, and the actuator extends or retracts. The concept is easy to understand and even easier to maintain.

However, modern manufacturing facilities face increasing pressure to improve energy efficiency, reduce maintenance requirements, eliminate leaks, and achieve greater positioning accuracy. These requirements have accelerated the adoption of electric actuators across industries ranging from packaging and assembly to semiconductor manufacturing and process automation.

Unlike traditional fluid-powered systems, electric actuators provide precise position control, programmable motion profiles, repeatable movement, and real-time diagnostic capabilities. Engineers can control acceleration, velocity, deceleration, and stopping position without relying on pressure regulators, flow controls, or mechanical adjustments.

Historically, these advantages came with a significant drawback. Electric motion systems often required servo drives, PLC programming, communication networks, tuning software, encoder feedback systems, and specialized motion control expertise.

For many facilities, especially those replacing simple pneumatic cylinders, this complexity created a major adoption barrier.

Modern integrated electric actuator platforms seek to eliminate this challenge by combining actuator mechanics, motor control electronics, and configuration software into a single package. The result is a system that delivers the benefits of electric motion while maintaining the operational simplicity that made pneumatic systems so popular.

This article examines SMC's e-Actuator platform and explores how integrated electric motion systems are helping manufacturers transition away from traditional fluid power technologies.

For facilities modernizing automation infrastructure, these technologies increasingly complement advanced PLC & PAC Systems, Industrial HMI Platforms, and Motion Control Solutions used throughout modern manufacturing operations.

Figure 1. The e-Actuator series in a demonstration unit from SMC.

Why Manufacturers Are Replacing Pneumatic and Hydraulic Actuators

Pneumatic systems remain one of the most widely used motion technologies in industrial automation. Compressed air is readily available in most factories, and pneumatic cylinders offer reliable operation for many applications.

Hydraulic systems continue to dominate applications requiring extremely high force output, including presses, heavy machinery, metal forming equipment, and large industrial actuators.

Despite these advantages, fluid power technologies introduce several operational challenges.

Compressed air systems are inherently inefficient. Significant energy losses occur during air compression, distribution, storage, and exhaust. Air leaks often develop throughout aging facilities, increasing energy costs without contributing useful work.

Hydraulic systems present different concerns. Fluid contamination, seal degradation, leaks, environmental considerations, and ongoing maintenance requirements increase lifecycle costs.

Electric actuators address many of these issues directly.

• No compressed air consumption
• No hydraulic fluid maintenance
• No leakage concerns
• Lower operating noise
• Improved positioning accuracy
• Programmable motion profiles
• Integrated diagnostics
• Higher energy efficiency

Perhaps most importantly, electric actuators provide precise control over movement rather than simply moving between two fixed endpoints.

This capability enables engineers to create flexible production systems capable of supporting multiple products, recipes, and operating modes without mechanical adjustments.

The Traditional Complexity of Electric Motion Systems

Although electric actuators offer significant performance advantages, traditional servo-based motion systems often require considerably more engineering effort than pneumatic installations.

A conventional electric motion solution typically includes:

• Servo motor
• Servo drive
• Motion controller
• Encoder feedback
• Communication network
• Programming software
• Power distribution hardware
• Safety integration

In many industrial facilities, engineers simply need a cylinder to move from Position A to Position B. Installing a complete servo system for such a simple requirement can introduce unnecessary complexity and cost.

This challenge explains why pneumatic cylinders remain common despite their limitations.

The engineering effort required to configure, commission, and maintain a traditional motion control system often outweighs the benefits for simple linear movement applications.

Integrated electric actuators attempt to bridge this gap by providing servo-level positioning performance while maintaining the simplicity of traditional fluid power control methods.

Understanding the SMC e-Actuator Concept

The SMC EQFS e-Actuator series approaches motion control from a practical perspective.

Instead of requiring engineers to purchase separate motors, drives, feedback systems, and controllers, the actuator integrates these components into a compact assembly.

This architecture dramatically reduces installation complexity.

The integrated controller automatically manages:

• Position control
• Motor commutation
• Acceleration control
• Deceleration control
• Position feedback
• Motion sequencing
• Fault monitoring

As a result, the user interacts with the actuator much like a pneumatic cylinder.

Simple digital inputs command motion, while the internal controller handles the sophisticated calculations and control algorithms operating behind the scenes.

Figure 2. Integrated controller with dedicated power, I/O, and configuration interfaces.

Integrated Controllers: Simplifying Electric Motion Deployment

One of the most significant barriers to electric actuator adoption has historically been controller complexity.

Traditional servo systems often require extensive configuration and specialized expertise.

Integrated controller architectures simplify deployment by embedding the motion intelligence directly into the actuator assembly.

From an installation standpoint, engineers primarily interact with three connections:

• 24 VDC power input
• Digital I/O interface
• Configuration interface

This design eliminates much of the wiring complexity commonly associated with standalone motion control systems.

Machine builders benefit from reduced panel space requirements, simplified documentation, and faster commissioning procedures.

Maintenance personnel also benefit because troubleshooting becomes significantly easier when the drive and actuator operate as a unified system.

Electrical Infrastructure Advantages Over Fluid Systems

One of the often-overlooked benefits of electric actuators involves facility infrastructure.

Pneumatic systems require extensive support equipment before a single actuator can operate.

This infrastructure may include:

• Air compressors
• Dryers
• Filters
• Pressure regulators
• Storage tanks
• Distribution piping
• Leak management programs

Hydraulic systems require equally substantial infrastructure investments.

These systems typically include pumps, reservoirs, valves, heat exchangers, filtration systems, and extensive piping networks.

Electric actuators eliminate many of these requirements.

Power distribution infrastructure already exists throughout most industrial facilities. Extending electrical connections to remote locations is often significantly easier than installing new compressed air or hydraulic networks.

This advantage becomes especially important in facility expansions and modernization projects.

Engineers can deploy motion systems in locations where compressed air may be unavailable or prohibitively expensive to install.

Understanding the Power and I/O Connections

The e-Actuator utilizes a straightforward wiring approach that aligns with common industrial automation practices.

The power connector receives standard 24 VDC control power, allowing compatibility with existing industrial power systems.

Most modern automation platforms already utilize 24 VDC power architectures for sensors, controllers, HMIs, and communication equipment.

This compatibility simplifies system integration.

Figure 3. Power and digital I/O pin assignments used by the integrated controller.

The digital input architecture differs slightly from many conventional PLC input modules.

Because the actuator internally references the supply voltage, external devices must share a common electrical reference.

Understanding this relationship becomes important during system integration.

Proper grounding and common reference management help ensure reliable operation while minimizing electrical noise and communication issues.

Engineers integrating electric actuators with Allen-Bradley ControlLogix, Siemens SIMATIC S7, or Schneider Modicon Quantum systems should verify common power reference practices during installation.

Industrial Applications That Benefit Most from Electric Actuators

Not every pneumatic or hydraulic application should automatically be converted to electric motion.

However, certain applications can benefit significantly from electric actuator technology.

Examples include:

• Packaging machinery
• Pick-and-place systems
• Assembly equipment
• Electronic manufacturing
• Pharmaceutical processing
• Food and beverage production
• Laboratory automation
• Semiconductor equipment

These applications frequently require repeatable positioning, flexible movement profiles, and reduced maintenance requirements.

Electric actuators deliver advantages that are difficult to achieve using traditional fluid power systems.

As manufacturing environments continue adopting smart factory strategies, electrically controlled motion systems increasingly align with Industry 4.0 objectives centered on connectivity, diagnostics, efficiency, and operational visibility.

Software Configuration: Where Electric Motion Becomes Practical

For many engineers, software configuration represents the biggest concern when transitioning from pneumatic cylinders to electric actuators.

Traditional motion control platforms often require extensive parameter setup, communication mapping, axis configuration, tuning procedures, and programming expertise.

The objective of the e-Actuator platform is fundamentally different.

Rather than exposing hundreds of motion parameters, the software focuses on configuring only the settings necessary for common industrial applications.

This approach dramatically shortens commissioning time while maintaining the performance advantages of electric motion.

The configuration software automatically identifies the connected actuator model and presents only the relevant parameters for adjustment.

As a result, engineers spend less time navigating complicated menus and more time optimizing machine performance.

Connecting to the e-Actuator Setup Tool

Configuration is performed using the dedicated e-Actuator Setup Tool provided by SMC.

The software communicates through the dedicated M12 configuration port located on the integrated controller.

After establishing communication, the software automatically detects:

• Actuator type
• Stroke length
• Controller version
• Available operating modes
• Current parameter settings

This automatic detection process eliminates many of the manual setup procedures traditionally associated with servo systems.

For machine builders deploying multiple actuators, this capability can significantly reduce startup time.

Commissioning technicians can quickly verify configurations, adjust settings, and validate operation without extensive programming knowledge.

Figure 4. Available operating modes within the e-Actuator Setup Tool.

Operating Modes Explained

One of the most innovative aspects of the platform is its ability to emulate familiar pneumatic valve behavior.

Maintenance technicians and machine operators already understand how pneumatic directional valves function.

By replicating these control methods, the learning curve for electric motion becomes substantially smaller.

The platform offers three primary operating modes.

Single Solenoid Mode

This mode behaves similarly to a spring-return pneumatic valve.

When the digital input activates, the actuator travels toward the commanded position.

When the signal is removed, the actuator automatically returns to its home position.

This operating mode is ideal for:

• Part ejection systems
• Simple positioning devices
• Clamping mechanisms
• Reject gates
• Loading stations

Many pneumatic cylinder applications can be replaced directly using this control method.

Double Solenoid Mode

Double solenoid mode mimics the behavior of a double-solenoid directional valve commonly used in pneumatic automation.

One digital input commands extension while a second input commands retraction.

The actuator maintains its position until a new command is received.

This approach offers greater control flexibility and closely resembles traditional industrial machine designs.

Applications include:

• Transfer systems
• Material handling equipment
• Automated assembly stations
• Indexing mechanisms
• Packaging equipment

Closed Center Mode

Closed center mode introduces a capability unavailable in most conventional pneumatic cylinders.

In addition to extension and retraction positions, the actuator can move to an intermediate position.

This enables three-position control using only two digital inputs.

The ability to stop at a configurable center position creates opportunities for more sophisticated machine operation without requiring a full servo motion controller.

Applications include:

• Multi-position part handling
• Sorting systems
• Inspection stations
• Transfer mechanisms
• Product positioning systems

This functionality highlights one of the major advantages electric actuators hold over conventional fluid power technologies.

Bridging the Gap Between Pneumatics and Servo Control

The operating modes demonstrate an important trend occurring throughout industrial automation.

Manufacturers increasingly seek solutions that combine the simplicity of traditional automation with the flexibility of modern digital technologies.

Electric actuators occupy a unique position within this transition.

They provide significantly greater functionality than pneumatic cylinders while avoiding much of the complexity associated with full servo motion platforms.

This balance is particularly attractive for machine builders developing equipment for customers who may not possess specialized motion control expertise.

Simple digital commands remain familiar to maintenance personnel, while advanced motion profiles remain available to engineering teams.

Advantages of Integrated Motion Profiles

One of the biggest limitations of pneumatic cylinders is the lack of precise motion control.

Although flow controls can influence speed, achieving repeatable acceleration and deceleration profiles remains difficult.

Pneumatic cylinders typically move as quickly as system pressure and load conditions allow.

This often creates:

• Mechanical shock
• Product damage
• Noise generation
• Component wear
• Reduced positioning accuracy

Electric actuators solve these issues through programmable motion profiles.

The controller continuously regulates motor output to achieve controlled movement throughout the entire travel path.

This results in smoother operation, improved repeatability, and longer equipment life.

In high-speed manufacturing environments, reducing impact forces can significantly improve machine reliability and product quality.

This benefit alone often justifies the transition from pneumatic systems to electric motion technologies.

Configuring Speed, Acceleration, and Position Parameters

Perhaps the greatest advantage electric actuators offer over fluid-powered systems is complete control over movement characteristics.

With pneumatic cylinders, engineers typically adjust flow control valves and regulator settings to influence speed. While this approach works for many applications, performance can vary depending on load conditions, air pressure fluctuations, and component wear.

Electric actuators eliminate these variables by allowing motion parameters to be defined directly within the controller.

Instead of relying on pressure and flow restrictions, engineers can establish precise values for:

• Acceleration rate
• Maximum travel speed
• Deceleration rate
• Target positions
• Intermediate positions
• Travel timing

This level of control significantly improves consistency across production cycles.

Every movement follows the same profile regardless of minor environmental or operating variations.

Figure 5. Position, speed, acceleration, and deceleration settings can be configured through the setup software.

Why Motion Profiles Matter in Modern Manufacturing

Motion quality has become increasingly important as production systems evolve.

Older manufacturing equipment often prioritized speed above all else. As long as the cylinder extended and retracted quickly, the system achieved its objective.

Today's manufacturing environments demand much more.

Production lines now handle delicate products, lightweight materials, precision assemblies, and highly customized product variants.

Excessive impact forces can damage products, reduce quality, and accelerate equipment wear.

Programmable motion profiles help eliminate these issues.

Instead of abruptly striking mechanical stops, electric actuators can gradually accelerate, maintain a controlled travel speed, and smoothly decelerate before reaching the target position.

The benefits include:

• Reduced mechanical shock
• Lower vibration levels
• Improved product quality
• Longer machine life
• Reduced maintenance costs
• Higher positioning accuracy

These advantages become especially important in industries such as electronics manufacturing, pharmaceutical production, semiconductor fabrication, and automated assembly operations.

Configurable Positioning Beyond Mechanical End Stops

Traditional pneumatic cylinders typically operate between two fixed mechanical limits.

If a different position is required, engineers often need to install mechanical stops, redesign hardware, or select a different actuator stroke length.

Electric actuators provide considerably greater flexibility.

The software allows engineers to define operational positions independently of the actuator's physical travel limits.

This means a single actuator can support multiple machine configurations without mechanical modification.

Examples include:

• Product-specific recipes
• Multiple package sizes
• Flexible assembly operations
• Automated changeovers
• Adaptive production systems

As manufacturers increasingly pursue flexible manufacturing strategies, this capability becomes a significant competitive advantage.

Instead of physically adjusting machinery between production runs, operators can simply select a new recipe through the machine interface.

The actuator automatically moves according to the new configuration parameters.

Industry 4.0 and Smart Manufacturing Benefits

The migration from fluid power to electric motion aligns closely with broader Industry 4.0 initiatives.

Modern factories increasingly depend on connected equipment capable of providing operational visibility, diagnostic information, and performance analytics.

Pneumatic cylinders generally offer limited feedback.

At best, engineers may install external sensors to determine extended and retracted positions.

Electric actuators inherently generate much richer operational data.

Examples include:

• Position feedback
• Motion status
• Cycle counts
• Error conditions
• Travel timing
• Performance trends
• Operating history

This information can support predictive maintenance initiatives and improve overall equipment effectiveness.

When integrated with modern Industrial Communication Networks and Industrial Computing Platforms, electric actuators become valuable data sources within connected manufacturing environments.

Energy Efficiency Comparison: Electric vs Pneumatic Systems

Energy efficiency remains one of the strongest arguments for electric actuator adoption.

Compressed air is often described as one of the most expensive utilities within a manufacturing facility.

Generating compressed air requires substantial electrical energy.

Additional losses occur through:

• Compression inefficiencies
• Distribution piping losses
• Pressure drops
• Air leaks
• Valve losses
• Exhaust losses

Industry studies frequently estimate that a significant percentage of compressed air produced within factories never performs useful work.

Electric actuators convert electrical energy directly into mechanical motion.

This direct conversion process generally achieves much higher overall system efficiency.

For facilities operating hundreds of actuators across multiple production lines, the cumulative energy savings can become substantial.

These savings often improve the total cost of ownership calculation when comparing electric and pneumatic technologies.

Reducing Maintenance Requirements

Maintenance considerations extend beyond energy consumption.

Fluid power systems require ongoing attention to maintain reliable operation.

Common maintenance activities include:

• Leak detection
• Seal replacement
• Filter servicing
• Pressure adjustment
• Lubrication management
• Air quality monitoring
• Hydraulic fluid replacement

Electric actuators eliminate many of these requirements.

Although mechanical components still require periodic inspection, the absence of compressed air and hydraulic fluids simplifies long-term maintenance strategies.

Many facilities pursuing reliability-centered maintenance programs increasingly view electric motion systems as a method for reducing unplanned downtime and maintenance workload.

Figure 6. Motion parameters can be written directly to the actuator, simplifying commissioning and future configuration changes.

Industrial Applications Where Electric Actuators Deliver the Greatest Value

Although electric actuators can replace many pneumatic cylinders, the greatest return on investment often occurs in applications requiring flexibility, accuracy, and repeatability.

Not every machine benefits equally from electric motion.

Simple push-and-retract applications operating continuously at high speed may still favor pneumatic technology due to lower upfront costs.

However, applications requiring controlled positioning, product changeovers, or multiple operating modes frequently benefit from electric solutions.

Some of the most successful deployments include:

• Automated assembly systems
• Packaging machinery
• Case packing equipment
• Product inspection stations
• Robotic transfer systems
• Electronic manufacturing lines
• Medical device production
• Semiconductor processing equipment

In these environments, the ability to modify motion parameters through software rather than hardware adjustments creates significant operational advantages.

Packaging Machinery Modernization

Packaging equipment represents one of the largest opportunities for electric actuator adoption.

Traditional packaging systems often contain dozens of pneumatic cylinders responsible for:

• Product positioning
• Carton handling
• Gate operation
• Part rejection
• Case loading
• Label positioning

As product variety increases, manufacturers frequently struggle with lengthy changeover procedures.

Mechanical adjustments become necessary whenever package dimensions change.

Electric actuators allow these adjustments to occur automatically.

Instead of manually repositioning stops and guides, operators simply select a new product recipe.

The machine then automatically adjusts actuator positions according to stored configuration parameters.

This capability significantly reduces changeover time while improving repeatability.

Many packaging OEMs now combine electric actuators with Industrial HMI Systems to create user-friendly setup interfaces that simplify machine operation.

Automated Assembly Systems

Assembly operations often require considerably more positioning precision than pneumatic cylinders can reliably provide.

Components must align accurately before insertion, fastening, welding, or inspection procedures occur.

Electric actuators offer repeatable positioning performance that supports:

• Component insertion
• Press-fit assembly
• Fastener positioning
• Connector installation
• Part transfer operations

Because positioning is software-defined, engineers can easily modify movement profiles as products evolve.

This flexibility becomes increasingly valuable in manufacturing environments producing multiple product variants on shared production equipment.

Food and Beverage Production

Food manufacturing facilities continue exploring alternatives to pneumatic systems for both operational and sustainability reasons.

Compressed air remains common throughout food processing plants, but reducing overall air consumption can significantly improve energy efficiency.

Electric actuators provide additional advantages including:

• Reduced energy consumption
• Improved positioning consistency
• Lower maintenance requirements
• Simplified sanitation procedures
• Improved process repeatability

Applications such as filling, sorting, packaging, and material handling frequently benefit from the precise control characteristics offered by electric motion systems.

Machine Builders and OEM Design Advantages

Machine builders face constant pressure to reduce engineering effort while improving machine performance.

Integrated electric actuators help achieve both objectives.

Traditional motion systems often require coordination among multiple suppliers including actuator manufacturers, drive vendors, cable suppliers, and control system providers.

An integrated actuator platform consolidates much of this complexity.

Benefits for OEMs include:

• Reduced component count
• Simplified electrical design
• Faster assembly
• Reduced panel space requirements
• Simplified documentation
• Shorter commissioning cycles

These advantages can significantly reduce machine development costs while improving standardization across equipment platforms.

Integration with Modern PLC Platforms

One reason electric actuators continue gaining popularity is their compatibility with modern industrial control systems.

The simple digital input architecture allows straightforward integration with virtually any PLC platform.

Common integration platforms include:

• Allen-Bradley ControlLogix
• Allen-Bradley CompactLogix
• Siemens SIMATIC S7
• Mitsubishi MELSEC iQ-R
• Omron CJ Series
• Schneider Modicon Quantum

Because the actuator controller handles the motion calculations internally, the PLC only needs to provide simple command signals.

This architecture minimizes programming requirements while preserving compatibility with existing automation infrastructure.

When Pneumatic Systems Still Make Sense

Despite the advantages of electric actuators, pneumatic technology remains highly effective for many industrial applications.

Engineers should evaluate requirements objectively rather than assuming newer technologies automatically provide the best solution.

Pneumatic cylinders often remain advantageous when:

• Extremely high cycle rates are required
• Position accuracy is not critical
• Existing air infrastructure is available
• Initial cost is the primary concern
• Environmental conditions are severe
• Simple end-to-end movement is sufficient

The most successful engineering decisions result from evaluating total lifecycle costs rather than focusing exclusively on initial purchase price.

In many facilities, a combination of pneumatic, hydraulic, and electric motion technologies provides the optimal solution.

The Future of Industrial Motion Control

The future of industrial automation will likely involve increasing adoption of intelligent electric motion systems.

Several industry trends continue driving this transition:

• Industry 4.0 initiatives
• Predictive maintenance programs
• Energy efficiency goals
• Flexible manufacturing requirements
• Digital transformation projects
• Workforce skill shortages

Integrated electric actuators address many of these challenges simultaneously.

They provide enhanced diagnostics, software-configurable operation, improved energy efficiency, and simplified maintenance while remaining accessible to technicians familiar with traditional automation systems.

As controller technology continues advancing, electric actuators will likely become even easier to deploy while offering increasingly sophisticated capabilities.

Conclusion

Electric actuators are no longer limited to complex servo-controlled applications. Modern integrated solutions such as the SMC e-Actuator platform demonstrate how electric motion can achieve the simplicity traditionally associated with pneumatic systems while delivering the precision, flexibility, and efficiency advantages of modern motor control technology.

By integrating controllers directly into the actuator assembly, simplifying wiring requirements, and providing intuitive software configuration tools, these systems reduce many of the barriers that previously discouraged electric motion adoption.

For manufacturers pursuing improved efficiency, reduced maintenance, enhanced positioning accuracy, and greater production flexibility, electric actuators offer a compelling alternative to conventional fluid power systems. While pneumatic and hydraulic technologies will continue serving important industrial roles, integrated electric motion solutions are becoming an increasingly attractive option for next-generation automation systems.