Optimizing Electric Actuators for Robotic Arm Articulation
MAR 16, 20269 MIN READ
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Electric Actuator Evolution and Robotic Arm Goals
Electric actuators have undergone significant evolution since their inception in the early 20th century, transitioning from simple electromagnetic devices to sophisticated precision control systems. The initial development focused on basic linear and rotary motion applications in industrial automation. By the 1960s, servo motors emerged as a breakthrough technology, introducing closed-loop control systems that enabled precise positioning and speed regulation.
The integration of permanent magnet materials in the 1980s marked a pivotal advancement, dramatically improving power-to-weight ratios and energy efficiency. This period witnessed the emergence of brushless DC motors, which eliminated mechanical wear issues associated with traditional brushed designs. The introduction of rare-earth magnets further enhanced torque density, making compact actuators viable for space-constrained applications.
Digital control revolution in the 1990s transformed electric actuators from analog-controlled devices to intelligent systems capable of complex motion profiles. The advent of field-oriented control algorithms enabled precise torque and flux control, significantly improving dynamic response characteristics. Modern actuators now incorporate advanced feedback systems, including high-resolution encoders and force sensors, enabling sub-micron positioning accuracy.
Contemporary robotic arm applications demand actuators that achieve multiple simultaneous objectives. Primary goals include maximizing torque-to-weight ratios to enhance payload capacity while minimizing overall system mass. Energy efficiency remains paramount, particularly for battery-powered mobile robots where operational duration directly correlates with actuator efficiency. Precision requirements have intensified, with modern applications demanding repeatability within micrometers for assembly and manufacturing tasks.
Speed and acceleration capabilities represent critical performance metrics, especially for high-throughput industrial applications. The ability to execute rapid point-to-point movements while maintaining trajectory accuracy determines overall system productivity. Additionally, actuators must demonstrate exceptional reliability and longevity, as robotic systems often operate continuously in demanding environments.
Emerging objectives focus on adaptive control capabilities, enabling actuators to adjust performance parameters based on real-time load conditions and environmental factors. Integration of artificial intelligence algorithms aims to optimize energy consumption and predict maintenance requirements, reducing operational costs and system downtime.
The integration of permanent magnet materials in the 1980s marked a pivotal advancement, dramatically improving power-to-weight ratios and energy efficiency. This period witnessed the emergence of brushless DC motors, which eliminated mechanical wear issues associated with traditional brushed designs. The introduction of rare-earth magnets further enhanced torque density, making compact actuators viable for space-constrained applications.
Digital control revolution in the 1990s transformed electric actuators from analog-controlled devices to intelligent systems capable of complex motion profiles. The advent of field-oriented control algorithms enabled precise torque and flux control, significantly improving dynamic response characteristics. Modern actuators now incorporate advanced feedback systems, including high-resolution encoders and force sensors, enabling sub-micron positioning accuracy.
Contemporary robotic arm applications demand actuators that achieve multiple simultaneous objectives. Primary goals include maximizing torque-to-weight ratios to enhance payload capacity while minimizing overall system mass. Energy efficiency remains paramount, particularly for battery-powered mobile robots where operational duration directly correlates with actuator efficiency. Precision requirements have intensified, with modern applications demanding repeatability within micrometers for assembly and manufacturing tasks.
Speed and acceleration capabilities represent critical performance metrics, especially for high-throughput industrial applications. The ability to execute rapid point-to-point movements while maintaining trajectory accuracy determines overall system productivity. Additionally, actuators must demonstrate exceptional reliability and longevity, as robotic systems often operate continuously in demanding environments.
Emerging objectives focus on adaptive control capabilities, enabling actuators to adjust performance parameters based on real-time load conditions and environmental factors. Integration of artificial intelligence algorithms aims to optimize energy consumption and predict maintenance requirements, reducing operational costs and system downtime.
Market Demand for Advanced Robotic Arm Systems
The global robotics market is experiencing unprecedented growth driven by increasing automation demands across multiple industries. Manufacturing sectors are leading this transformation, with automotive, electronics, and aerospace companies investing heavily in advanced robotic systems to enhance production efficiency and maintain competitive advantages. The shift toward Industry 4.0 has accelerated the adoption of sophisticated robotic arms capable of performing complex assembly, welding, painting, and material handling operations with superior precision and reliability.
Healthcare applications represent one of the fastest-growing segments for advanced robotic arm systems. Surgical robots equipped with high-precision electric actuators are revolutionizing minimally invasive procedures, enabling surgeons to perform operations with enhanced dexterity and reduced patient trauma. Rehabilitation robotics is also gaining traction, with robotic arms assisting patients in physical therapy and mobility restoration programs.
The logistics and warehousing sector has emerged as a significant driver of market demand, particularly following the e-commerce boom. Companies are deploying robotic arms for automated sorting, packaging, and inventory management to handle increasing order volumes while addressing labor shortages. These applications require actuators capable of rapid, repetitive movements while maintaining consistent performance over extended operational periods.
Service robotics applications are expanding beyond traditional industrial settings into consumer and commercial environments. Restaurant automation, elderly care assistance, and domestic service robots are creating new market opportunities for robotic arm systems with advanced articulation capabilities. These applications demand actuators that combine precision with safety features for human-robot interaction scenarios.
The aerospace and defense industries are driving demand for specialized robotic systems capable of operating in extreme environments. Space exploration missions, satellite servicing, and military applications require robotic arms with exceptional reliability and precision, pushing the boundaries of electric actuator technology development.
Market growth is further supported by technological convergence trends, including artificial intelligence integration, advanced sensor fusion, and improved human-machine interfaces. These developments are expanding the potential applications for robotic arms while increasing performance expectations for their actuator systems, creating sustained demand for optimized electric actuator solutions.
Healthcare applications represent one of the fastest-growing segments for advanced robotic arm systems. Surgical robots equipped with high-precision electric actuators are revolutionizing minimally invasive procedures, enabling surgeons to perform operations with enhanced dexterity and reduced patient trauma. Rehabilitation robotics is also gaining traction, with robotic arms assisting patients in physical therapy and mobility restoration programs.
The logistics and warehousing sector has emerged as a significant driver of market demand, particularly following the e-commerce boom. Companies are deploying robotic arms for automated sorting, packaging, and inventory management to handle increasing order volumes while addressing labor shortages. These applications require actuators capable of rapid, repetitive movements while maintaining consistent performance over extended operational periods.
Service robotics applications are expanding beyond traditional industrial settings into consumer and commercial environments. Restaurant automation, elderly care assistance, and domestic service robots are creating new market opportunities for robotic arm systems with advanced articulation capabilities. These applications demand actuators that combine precision with safety features for human-robot interaction scenarios.
The aerospace and defense industries are driving demand for specialized robotic systems capable of operating in extreme environments. Space exploration missions, satellite servicing, and military applications require robotic arms with exceptional reliability and precision, pushing the boundaries of electric actuator technology development.
Market growth is further supported by technological convergence trends, including artificial intelligence integration, advanced sensor fusion, and improved human-machine interfaces. These developments are expanding the potential applications for robotic arms while increasing performance expectations for their actuator systems, creating sustained demand for optimized electric actuator solutions.
Current State of Electric Actuators in Robotics
Electric actuators have emerged as the dominant force transmission technology in modern robotic arm systems, representing a significant evolution from traditional hydraulic and pneumatic alternatives. The current landscape is characterized by sophisticated servo motor systems integrated with precision gearboxes, advanced control electronics, and intelligent feedback mechanisms that enable precise positioning and force control across multiple degrees of freedom.
Contemporary electric actuator implementations in robotics predominantly utilize brushless DC motors and AC servo motors, which offer superior efficiency, reduced maintenance requirements, and enhanced controllability compared to their brushed counterparts. These systems typically achieve positioning accuracies within micrometers and repeatability tolerances that meet stringent industrial automation standards. The integration of high-resolution encoders, ranging from 17-bit to 23-bit resolution, enables precise angular position feedback essential for complex manipulation tasks.
Power density remains a critical performance metric, with leading manufacturers achieving torque-to-weight ratios exceeding 10 Nm/kg in compact form factors. Modern actuator designs incorporate rare-earth permanent magnet materials, optimized winding configurations, and advanced thermal management systems to maximize power output while maintaining operational reliability. Silicon carbide power electronics and field-oriented control algorithms have further enhanced efficiency levels, with many systems achieving over 90% energy conversion efficiency.
The control architecture landscape has evolved toward distributed intelligence, where individual actuators incorporate embedded processors capable of executing complex motion profiles, safety functions, and diagnostic routines. EtherCAT, PROFINET, and other industrial Ethernet protocols have become standard communication interfaces, enabling real-time coordination between multiple actuators with sub-millisecond synchronization capabilities.
Current technological limitations center around heat dissipation challenges, particularly in high-duty-cycle applications where continuous operation generates significant thermal loads. Gear backlash and compliance issues continue to affect precision in applications requiring sub-micron positioning accuracy. Additionally, the trade-off between speed and torque capabilities constrains performance optimization, as high-speed operations typically compromise maximum torque output and vice versa.
Recent developments focus on direct-drive architectures that eliminate gear reduction mechanisms, utilizing high-pole-count motors with integrated position sensing. These systems address backlash concerns while enabling higher bandwidth control loops, though at the expense of increased motor size and cost. Collaborative robotics applications have driven demand for inherently safe actuator designs incorporating torque limiting, collision detection, and compliant mechanical interfaces.
Contemporary electric actuator implementations in robotics predominantly utilize brushless DC motors and AC servo motors, which offer superior efficiency, reduced maintenance requirements, and enhanced controllability compared to their brushed counterparts. These systems typically achieve positioning accuracies within micrometers and repeatability tolerances that meet stringent industrial automation standards. The integration of high-resolution encoders, ranging from 17-bit to 23-bit resolution, enables precise angular position feedback essential for complex manipulation tasks.
Power density remains a critical performance metric, with leading manufacturers achieving torque-to-weight ratios exceeding 10 Nm/kg in compact form factors. Modern actuator designs incorporate rare-earth permanent magnet materials, optimized winding configurations, and advanced thermal management systems to maximize power output while maintaining operational reliability. Silicon carbide power electronics and field-oriented control algorithms have further enhanced efficiency levels, with many systems achieving over 90% energy conversion efficiency.
The control architecture landscape has evolved toward distributed intelligence, where individual actuators incorporate embedded processors capable of executing complex motion profiles, safety functions, and diagnostic routines. EtherCAT, PROFINET, and other industrial Ethernet protocols have become standard communication interfaces, enabling real-time coordination between multiple actuators with sub-millisecond synchronization capabilities.
Current technological limitations center around heat dissipation challenges, particularly in high-duty-cycle applications where continuous operation generates significant thermal loads. Gear backlash and compliance issues continue to affect precision in applications requiring sub-micron positioning accuracy. Additionally, the trade-off between speed and torque capabilities constrains performance optimization, as high-speed operations typically compromise maximum torque output and vice versa.
Recent developments focus on direct-drive architectures that eliminate gear reduction mechanisms, utilizing high-pole-count motors with integrated position sensing. These systems address backlash concerns while enabling higher bandwidth control loops, though at the expense of increased motor size and cost. Collaborative robotics applications have driven demand for inherently safe actuator designs incorporating torque limiting, collision detection, and compliant mechanical interfaces.
Existing Electric Actuator Solutions for Robotic Arms
01 Electric actuators with integrated control systems
Electric actuators can be designed with integrated control systems that allow for precise positioning and motion control. These systems typically include electronic controllers, sensors, and feedback mechanisms that enable automated operation and remote control capabilities. The integration of control electronics directly into the actuator housing provides compact solutions with improved reliability and reduced wiring complexity.- Electric actuators with integrated control systems: Electric actuators can be designed with integrated control systems that enable precise positioning and motion control. These systems typically include electronic controllers, sensors, and feedback mechanisms that allow for automated operation and real-time adjustments. The integration of control electronics directly into the actuator housing improves reliability, reduces installation complexity, and enables advanced features such as programmable motion profiles and remote monitoring capabilities.
- Compact and miniaturized electric actuator designs: Miniaturization techniques are employed to create compact electric actuators suitable for space-constrained applications. These designs focus on optimizing the arrangement of motor components, gear mechanisms, and housing structures to achieve maximum power density while minimizing overall dimensions. Advanced materials and manufacturing processes enable the production of lightweight yet robust actuators that maintain high performance characteristics in reduced form factors.
- Electric actuators with enhanced durability and environmental protection: Electric actuators can be engineered with protective features to withstand harsh operating environments. These enhancements include sealed housings to prevent ingress of dust and moisture, corrosion-resistant materials, and thermal management systems. The incorporation of robust sealing mechanisms and protective coatings extends the operational lifespan of actuators in demanding industrial, automotive, and outdoor applications where exposure to extreme temperatures, humidity, and contaminants is common.
- Multi-axis and coordinated electric actuator systems: Advanced electric actuator systems can be configured to provide multi-axis motion control through coordinated operation of multiple actuator units. These systems enable complex motion patterns and precise positioning in multiple degrees of freedom. Synchronization mechanisms and sophisticated control algorithms allow for coordinated movement, making them suitable for robotic applications, automated manufacturing equipment, and precision positioning systems that require simultaneous control of multiple motion axes.
- Energy-efficient electric actuator technologies: Energy efficiency improvements in electric actuators are achieved through optimized motor designs, advanced power electronics, and intelligent control strategies. These technologies include the use of high-efficiency motors, regenerative braking systems, and power management algorithms that reduce energy consumption during operation. The implementation of variable speed control and sleep modes further enhances energy efficiency, making these actuators suitable for battery-powered and energy-conscious applications where minimizing power consumption is critical.
02 Linear electric actuators with screw drive mechanisms
Linear electric actuators utilize screw drive mechanisms to convert rotary motion from an electric motor into linear motion. These actuators commonly employ ball screws, lead screws, or roller screws to achieve efficient force transmission and precise positioning. The screw drive configuration provides high load capacity, good positioning accuracy, and self-locking capabilities in many applications.Expand Specific Solutions03 Electric actuators for valve control applications
Electric actuators are specifically designed for controlling valves in various industrial and commercial applications. These actuators provide automated opening and closing of valves with features such as torque limiting, position indication, and fail-safe operation. They offer advantages over manual or pneumatic valve operators including precise control, energy efficiency, and integration with building or process automation systems.Expand Specific Solutions04 Compact electric actuators with gear reduction systems
Compact electric actuators incorporate gear reduction systems to increase output torque while maintaining small form factors. These designs utilize planetary gears, worm gears, or other reduction mechanisms to amplify the motor torque for demanding applications. The compact configuration makes them suitable for space-constrained installations while providing high force output and durability.Expand Specific Solutions05 Electric actuators with position sensing and feedback
Electric actuators equipped with position sensing and feedback systems enable closed-loop control for enhanced accuracy and repeatability. These systems employ potentiometers, encoders, or other sensing technologies to continuously monitor actuator position and provide feedback signals to the controller. The feedback mechanism allows for precise positioning, speed control, and detection of mechanical issues or obstructions during operation.Expand Specific Solutions
Key Players in Electric Actuator and Robotics Industry
The electric actuator optimization for robotic arm articulation represents a rapidly evolving market in the growth phase, driven by increasing automation demands across industries. The market demonstrates substantial scale with diverse applications spanning industrial automation, medical robotics, and specialized environments. Technology maturity varies significantly among key players: established companies like KUKA Deutschland GmbH and Honda Motor Co., Ltd. showcase advanced commercial solutions, while specialized firms such as Fieldwork Robotics Ltd. and Oliver Crispin Robotics Ltd. focus on niche applications. Research institutions including NASA and Commissariat à l'énergie atomique contribute cutting-edge innovations, while component manufacturers like NTN Corp. and HIWIN Technologies Corp. provide essential precision elements. This competitive landscape reflects a maturing ecosystem where traditional automation leaders compete alongside emerging specialists, indicating strong market potential and technological advancement opportunities.
KUKA Deutschland GmbH
Technical Solution: KUKA has developed advanced electric actuator systems for robotic arms featuring high-precision servo motors with integrated position feedback systems. Their actuators utilize brushless DC motors with planetary gearboxes to achieve torque densities up to 15 Nm/kg while maintaining positioning accuracy within ±0.02mm. The company implements advanced control algorithms including adaptive impedance control and force-torque sensing integration to optimize joint articulation performance. Their electric actuators feature modular designs with standardized interfaces, enabling flexible configuration for different payload requirements ranging from 3kg to 1300kg across their robot portfolio.
Strengths: Industry-leading precision and reliability, extensive experience in industrial robotics, comprehensive control software integration. Weaknesses: Higher cost compared to competitors, primarily focused on industrial applications rather than emerging markets.
HIWIN Technologies Corp.
Technical Solution: HIWIN specializes in electric actuator optimization through their proprietary linear and rotary actuator systems designed specifically for robotic arm joints. Their technology incorporates high-efficiency permanent magnet synchronous motors with advanced magnetic encoder feedback systems achieving resolution up to 23-bit absolute positioning. The company has developed thermal management solutions using aluminum heat sinks and forced air cooling to maintain optimal operating temperatures during continuous operation. Their actuators feature integrated safety functions including overcurrent protection and emergency stop capabilities, with communication protocols supporting EtherCAT and CANopen for seamless integration into robotic control systems.
Strengths: Cost-effective solutions with good performance-to-price ratio, strong presence in Asian markets, comprehensive product portfolio. Weaknesses: Limited brand recognition in European and North American markets, less advanced AI integration compared to premium competitors.
Core Innovations in Electric Actuator Optimization
Actuator for a robotic arm with improved configuration
PatentWO2025103725A1
Innovation
- The proposed actuator features a double hollow shaft configuration with a lightweight design, allowing for a high torque-to-mass ratio of 40-80 Nm/kg, and eliminates axis stops to enable multi-turn rotations, facilitating control of robotic arms in welding operations.
articulation FOR ROBOTIZED ARM
PatentActiveFR3065898A1
Innovation
- A joint design with a passage duct connecting axial and radial openings, using a bypass bridge to integrate solid shaft motors, ensuring flexible elements bypass the motor and encoder, and incorporating seals and rotation guides for enhanced rigidity and sealing.
Safety Standards for Industrial Robotic Systems
Safety standards for industrial robotic systems incorporating optimized electric actuators represent a critical framework ensuring operational reliability and personnel protection. The integration of advanced electric actuators in robotic arm articulation systems necessitates comprehensive safety protocols that address both traditional mechanical hazards and emerging risks associated with enhanced precision and power capabilities.
International safety standards, primarily ISO 10218-1 and ISO 10218-2, establish fundamental requirements for industrial robot safety, encompassing risk assessment methodologies, protective measures, and operational guidelines. These standards mandate specific safety functions including emergency stop systems, speed and force limiting, and collaborative operation protocols. The implementation of optimized electric actuators must comply with these established frameworks while addressing unique characteristics such as increased torque density and dynamic response capabilities.
Functional safety requirements under IEC 61508 and ISO 13849 define performance levels and safety integrity levels for control systems governing electric actuators. These standards specify redundancy requirements, diagnostic coverage, and failure rate thresholds that directly impact actuator design and integration. Safety-rated encoders, dual-channel monitoring systems, and predictive maintenance algorithms become essential components when implementing high-performance electric actuators in industrial applications.
Risk assessment protocols must evaluate hazards specific to optimized electric actuators, including thermal management failures, electromagnetic interference, and software-related malfunctions. The enhanced precision and speed capabilities of modern electric actuators introduce new risk scenarios requiring updated safety analysis methodologies. Hazard identification processes must consider failure modes unique to advanced motor control algorithms and sensor fusion technologies.
Collaborative robotics applications demand additional safety considerations when utilizing optimized electric actuators. Power and force limiting requirements, as defined in ISO/TS 15066, establish maximum allowable contact forces and pressures during human-robot interaction. Electric actuators must incorporate real-time force monitoring and immediate response capabilities to ensure compliance with these stringent safety thresholds while maintaining operational efficiency and precision in articulated robotic systems.
International safety standards, primarily ISO 10218-1 and ISO 10218-2, establish fundamental requirements for industrial robot safety, encompassing risk assessment methodologies, protective measures, and operational guidelines. These standards mandate specific safety functions including emergency stop systems, speed and force limiting, and collaborative operation protocols. The implementation of optimized electric actuators must comply with these established frameworks while addressing unique characteristics such as increased torque density and dynamic response capabilities.
Functional safety requirements under IEC 61508 and ISO 13849 define performance levels and safety integrity levels for control systems governing electric actuators. These standards specify redundancy requirements, diagnostic coverage, and failure rate thresholds that directly impact actuator design and integration. Safety-rated encoders, dual-channel monitoring systems, and predictive maintenance algorithms become essential components when implementing high-performance electric actuators in industrial applications.
Risk assessment protocols must evaluate hazards specific to optimized electric actuators, including thermal management failures, electromagnetic interference, and software-related malfunctions. The enhanced precision and speed capabilities of modern electric actuators introduce new risk scenarios requiring updated safety analysis methodologies. Hazard identification processes must consider failure modes unique to advanced motor control algorithms and sensor fusion technologies.
Collaborative robotics applications demand additional safety considerations when utilizing optimized electric actuators. Power and force limiting requirements, as defined in ISO/TS 15066, establish maximum allowable contact forces and pressures during human-robot interaction. Electric actuators must incorporate real-time force monitoring and immediate response capabilities to ensure compliance with these stringent safety thresholds while maintaining operational efficiency and precision in articulated robotic systems.
Energy Efficiency Requirements for Robotic Applications
Energy efficiency has become a critical performance metric for robotic applications, particularly in industrial automation, service robotics, and autonomous systems where operational costs and battery life directly impact system viability. Modern robotic arms must operate continuously for extended periods while maintaining precision and reliability, making energy consumption optimization a primary design consideration.
The automotive manufacturing sector exemplifies stringent energy requirements, where robotic arms perform repetitive tasks for 16-20 hours daily. These applications demand actuators with efficiency ratings exceeding 85% to minimize heat generation and reduce cooling system requirements. Similarly, mobile robotic platforms face even more restrictive energy constraints, requiring actuator systems that can operate for 8-12 hours on single battery charges while maintaining full functionality.
Contemporary energy efficiency standards for robotic actuators typically specify power consumption metrics based on payload-to-power ratios. High-performance applications require actuators delivering at least 10 Nm of torque per watt of power consumption, while precision assembly tasks may accept lower ratios in favor of enhanced accuracy and repeatability.
Thermal management considerations significantly influence energy efficiency requirements, as excessive heat generation reduces actuator lifespan and necessitates additional cooling infrastructure. Effective actuator designs must maintain operating temperatures below 60°C under continuous operation while delivering rated performance, requiring careful balance between power density and thermal dissipation capabilities.
Regenerative energy recovery capabilities represent an emerging requirement for advanced robotic systems. Modern actuators should capture and reuse energy during deceleration phases, potentially recovering 15-30% of consumed energy in typical pick-and-place operations. This capability becomes particularly valuable in high-cycle applications where frequent acceleration and deceleration cycles occur.
Dynamic energy scaling requirements enable actuators to adjust power consumption based on real-time load conditions. Variable speed drives and intelligent control algorithms allow actuators to reduce energy consumption by up to 40% during low-load operations while maintaining rapid response capabilities when full performance is required.
The automotive manufacturing sector exemplifies stringent energy requirements, where robotic arms perform repetitive tasks for 16-20 hours daily. These applications demand actuators with efficiency ratings exceeding 85% to minimize heat generation and reduce cooling system requirements. Similarly, mobile robotic platforms face even more restrictive energy constraints, requiring actuator systems that can operate for 8-12 hours on single battery charges while maintaining full functionality.
Contemporary energy efficiency standards for robotic actuators typically specify power consumption metrics based on payload-to-power ratios. High-performance applications require actuators delivering at least 10 Nm of torque per watt of power consumption, while precision assembly tasks may accept lower ratios in favor of enhanced accuracy and repeatability.
Thermal management considerations significantly influence energy efficiency requirements, as excessive heat generation reduces actuator lifespan and necessitates additional cooling infrastructure. Effective actuator designs must maintain operating temperatures below 60°C under continuous operation while delivering rated performance, requiring careful balance between power density and thermal dissipation capabilities.
Regenerative energy recovery capabilities represent an emerging requirement for advanced robotic systems. Modern actuators should capture and reuse energy during deceleration phases, potentially recovering 15-30% of consumed energy in typical pick-and-place operations. This capability becomes particularly valuable in high-cycle applications where frequent acceleration and deceleration cycles occur.
Dynamic energy scaling requirements enable actuators to adjust power consumption based on real-time load conditions. Variable speed drives and intelligent control algorithms allow actuators to reduce energy consumption by up to 40% during low-load operations while maintaining rapid response capabilities when full performance is required.
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