Collaborative Robots: A New Chapter in Industrial Automation
Just ten years ago, an industrial robot was a massive machine behind a safety fence, welding car bodies or moving heavy workpieces. No human was allowed near the work zone, as any contact could result in serious injury. Today, the situation has changed dramatically. Collaborative robots, or cobots, work side by side with operators on assembly lines, packaging stations, and even in laboratories. The cobot market was valued at USD 2.15 billion in 2024, and analysts project it will grow to USD 11.64 billion by 2030.
In this article, we will examine how cobots differ from traditional industrial robots, which safety standards govern their operation, and what role servo drives and variable frequency drives play in modern robotics.
Cobot vs Traditional Robot: Comparison Table
| Parameter | Collaborative Robot (Cobot) | Traditional Industrial Robot |
|---|---|---|
| Payload Capacity | 3 — 35 kg (most models up to 20 kg) | 5 — 2,300 kg |
| Movement Speed | Up to 1.5 m/s (limited by safety standards) | Up to 10 m/s and above |
| Positioning Accuracy | ± 0.02 — 0.05 mm | ± 0.01 — 0.05 mm |
| Safety | Built-in force and torque sensors, power limiting | Requires safety fencing or light curtains |
| Programming | Hand guiding (teach-by-demonstration), graphical interface | Specialized languages (RAPID, KRL, Karel) |
| Deployment Time | Hours — days | Weeks — months |
| Implementation Cost | USD 20,000 — 70,000 | USD 50,000 — 500,000+ |
| Typical Applications | Assembly, packaging, machine tending, quality inspection | Welding, painting, heavy material handling |
| Work Zone | Shared with humans, no fencing required | Isolated zone with safety fencing |
How Cobots Ensure Safety: ISO 10218 and ISO/TS 15066 Standards
The primary concern when humans and robots share a workspace is safety. The International Organization for Standardization has developed two key documents that define the rules of engagement.
ISO 10218-1:2025 and ISO 10218-2:2025
Updated in 2025, the ISO 10218 standards replaced the previous 2011 editions. The first part addresses the safety of the robot as a device, while the second covers the safety of the robotic system as a whole, including integration into production lines. The new editions introduced clearer functional safety requirements, new classifications, and testing methods. The standards define four collaborative operation modes:
- Safety-Rated Monitored Stop — the robot stops when a person enters the work zone and resumes operation after they leave.
- Hand Guiding — the operator physically directs the robot using a dedicated handle.
- Speed and Separation Monitoring — the robot slows down or stops depending on the distance to a person, tracked by LiDAR sensors or cameras.
- Power and Force Limiting — the robot limits contact force to safe values, even during a collision.
ISO/TS 15066: Permissible Contact Forces
This technical standard details biomechanical pain and injury thresholds for 29 body regions. For example, the maximum permissible force upon contact with a hand is 140 N, while for the face it is only 65 N. Cobot manufacturers calibrate torque sensors in each joint of the manipulator according to these thresholds. Even with built-in safety systems, the standard requires integrators to conduct a comprehensive risk assessment for each specific workstation.
Leading Cobot Manufacturers and Their Flagship Models
Universal Robots: Market Pioneer
The Danish company Universal Robots essentially created the cobot market when it released the UR5 model in 2008. Today, the lineup includes the UR3e (3 kg), UR5e (5 kg), UR10e (12.5 kg), UR16e (16 kg), and UR20 (20 kg). The e+ series features built-in force/torque sensors in each joint, providing precise force limiting. Programming is done through the Polyscope tablet interface, where operators can set motion trajectories simply by manually guiding the manipulator arm.
ABB GoFa and YuMi: Watchmaker-Level Precision
The dual-arm ABB YuMi (You and Me) robot has become a symbol of safe collaboration. With a payload of 0.5 kg per arm, it is designed for precision electronics assembly, medical device production, and pharmaceutical packaging. Positioning repeatability is ± 0.02 mm. The GoFa CRB 15000 model extends the lineup to 5 kg payload with a 950 mm reach while maintaining force limiting capabilities. In 2025, ABB reported a 20% increase in cobot sales.
FANUC CRX: Industrial Reliability in a Collaborative Format
The FANUC CRX series (CRX-5iA, CRX-10iA, CRX-20iA, CRX-25iA) is built on the proven FANUC industrial robot platform, with the addition of contact force sensors and simplified drag-and-drop programming. The CRX-25iA handles up to 25 kg, making it one of the most powerful cobots on the market. FANUC recorded 17% growth in 2025, driven by demand from the semiconductor and electronics industries.
KUKA LBR iiwa and Other Players
Germany's KUKA offers the LBR iiwa (intelligent industrial work assistant) with torque sensors in each of its seven joints. Japan's Yaskawa, DENSO, and Epson are also actively developing collaborative product lines. Taiwan's Techman Robot integrates machine vision directly into the robot, simplifying visual inspection tasks. We covered intelligent robotics at the factories of the future in a separate article.
Where Cobots Work: Real-World Applications
Assembly and Installation
In the automotive industry, cobots install dashboard components, drive fasteners, and apply sealant. The human prepares parts and monitors quality, while the robot performs the monotonous repetitive operation with consistent precision thousands of times in a row. For example, at BMW plants, cobots help workers install sound insulation in doors — a task that requires both strength and delicacy simultaneously.
CNC Machine Tending
A cobot loads a workpiece into the machine, waits for processing to complete, unloads the finished part, and inserts the next one. A single operator can monitor multiple machines simultaneously, freed from routine loading and unloading. Variable frequency drives are often used to control spindle speed, providing smooth motor speed regulation, while a programmable logic controller coordinates the operation of both the machine and the cobot.
Welding
Collaborative welding is one of the fastest-growing segments. A cobot with a welding torch follows a pre-programmed path, while the welder prepares parts, inspects weld quality, and adjusts parameters. This addresses the acute shortage of skilled welders: according to the American Welding Society, the US will face a deficit of 360,000 welders by 2030. The cobot does not replace the human but augments them, taking over repetitive operations.
Quality Control and Inspection
Equipped with cameras and machine vision systems, cobots verify part geometry, detect surface defects, and sort products. Japanese company Koyo Electronics Industries reduced its workday from 10 to 8 hours and increased productivity by 31% by integrating a cobot into its touch panel inspection process.
Packaging and Palletizing
Cobots form boxes, place products, and build pallets. Although their speed is lower than traditional robots (9-10 cycles per minute versus 15-20), they compensate with flexibility: changeover to a new packaging format takes minutes, not days.
The Role of Servo Drives and VFDs in Robotics
Every joint in a cobot is a servo drive consisting of a motor, gearbox, position sensor (encoder), and controller. It is precisely the servo drives that provide the accuracy and smoothness of motion that distinguish a modern cobot from the mechanical manipulators of the past.
Servo Drives: The Brain and Muscles of a Cobot
In 2025, 37.65% of the servo drive market is attributed to robotics applications, with this segment growing at 5.55% annually. Compact servo drives with integrated functional safety, torque sensors, and hollow shafts for routing cables inside the manipulator are being developed specifically for cobots. These solutions enable lightweight modular designs with minimal external wiring.
Modern servo drivers are no longer just power amplifiers. They have become edge nodes in the Industrial Internet of Things (IIoT), collecting data on motor temperature, load, vibration, and trajectory deviation. This data feeds into cloud analytics systems for predictive maintenance: instead of waiting for a breakdown, the system warns about bearing wear or lubricant degradation.
Variable Frequency Drives in Auxiliary Systems
Variable frequency drives (VFDs) play a key role not so much in the cobots themselves, but in the equipment they work with. Conveyor lines, cooling pumps, workspace ventilation, compressors for pneumatic grippers — all these systems require the smooth speed regulation that a frequency converter provides. For example, a conveyor feeding parts to a cobot must synchronize with the robot's speed, which is only possible with precise control of the conveyor motor's rotational frequency.
Moreover, modern VFDs, like servo drivers, support industrial communication protocols (EtherNet/IP, PROFINET, EtherCAT), enabling their integration into a unified automation network alongside cobots and PLCs. You can read more about modern frequency converter concepts in our review.
Industrial Networks: How a Cobot Communicates with Equipment
In modern manufacturing, a cobot does not work in isolation. It is part of an integrated system where the programmable logic controller acts as a conductor, coordinating the operation of the cobot, conveyor, machine tool, and safety system. Data exchange occurs in real time through deterministic industrial networks: EtherCAT provides update cycles of less than 1 ms, which is critical for synchronizing cobot movement with conveyor belt motion.
The transition from legacy fieldbuses (Profibus, DeviceNet) to Industrial Ethernet transforms servo drives and frequency converters into full-fledged network devices capable of transmitting not only control commands but also diagnostic information for Industry 4.0 systems.
Implementation Economics: When a Cobot Pays for Itself
The average cost of a cobot is USD 35,000 — 50,000, and with grippers, tooling, and integration, USD 70,000 — 120,000. With three-shift operation, the payback period is 12 — 18 months. For comparison: a traditional industrial robot with fencing and safety systems costs USD 150,000 — 500,000, and its integration can take several months.
The key advantage of a cobot is the low barrier to entry for small and medium-sized businesses. A company does not need a full-time robotics engineer: an operator, after a few hours of training, can independently reprogram the cobot for a new task. This stands in stark contrast to traditional robots, where changing a production program requires engaging specialist integrators.
The Cobot Market in 2025: Geography and Trends
The Asia-Pacific region leads with a 49% share of the global cobot market, driven by large-scale manufacturing in China, Japan, and South Korea. North America holds 32%, and Europe accounts for 27%, supported by strong engineering foundations and the automotive industry.
Key trends for 2025:
- Artificial intelligence in control — cobots are learning to recognize objects, adapt trajectories to non-standard part positions, and optimize movements for energy savings.
- Mobile manipulators — combining a cobot with an autonomous mobile robot (AMR) creates a robot that can independently move between workstations.
- Cloud robotics — cobot programs are stored in cloud libraries, enabling rapid scaling of solutions across multiple production sites.
- Increasing payload capacity — new models with 25-35 kg payloads are blurring the line between cobots and lightweight industrial robots.
The Future: Humans and Robots as a Team
Collaborative robotics is not about replacing people with machines. It is about creating teams where each member does what they do best. The human analyzes, makes decisions, and adapts to non-standard situations. The robot provides repeatability, endurance, and precision. Together, they achieve results that neither could accomplish alone.
84% of businesses plan to introduce or expand robotic automation in the coming years. Thanks to declining costs, simplified programming, and rigorous safety standards, cobots are becoming accessible even to small manufacturers. And integration with servo drives, variable frequency drives, and programmable controllers makes them a full-fledged part of the modern Industry 4.0 industrial ecosystem.
