Today, as commercial mobile robot rapidly moves towards high density, high collaboration, and high safety, hub motor has become the core power unit for AGV/AMR, service robot, and automatic delivery platform. The key factor determining the safety, accuracy, endurance, and operation of robot is electromagnetic brake. Shenzhen Zhongling Technology Co., Ltd. (ZLTECH for short), as deeply involved in the field of commercial robot hub motor, has long integrated electromagnetic brakewith hub motor to provide a safer, more precise, and energy-efficient integrated solution, helping commercial robots achieve stable and reliable mobile operation.

1. The core working principle of electromagnetic brake

Electromagnetic brake (also known as power-off brake) is a device that relies on the combination of electromagnetic force and spring mechanical force to achieve braking. Its working logic is simple and reliable:

1) Power-on release

When the coil is energized, it generates a magnetic field, which attracts the armature to overcome the spring pressure. The friction plate separates from the brake disc, allowing the motor to rotate freely and enabling the robot to move normally.

2) Power off lock

After the coil loses power, the magnetic field disappears, and the spring quickly pushes the armature to press the friction plate, locking the motor shaft through friction and achieving immediate parking.

3) Fault safety features

Whether the system is powered off, communication is interrupted, or an emergency stop is triggered, the brake will automatically lock mechanically, theoretically eliminating the risk of slipping and skidding. 

The natural safety feature of running on power and stopping off power makes electromagnetic brake an ideal braking solution for robot hub motor.

2. Electromagnetic brake: the "safety center" of robot hub motor

1) Millisecond level emergency stop, safeguarding human-machine safety

Robot interacts frequently with people and equipment in scenarios such as warehousing, workshop, and supermarket, and its emergency braking ability directly determines its safety level. The electromagnetic brake equipped on the ZLTECH hub motor has a response time of ≤ 20ms. When the emergency stop button, collision sensor, and LiDAR obstacle avoidance signal are triggered, the wheel hub is instantly locked, effectively shortening the braking distance and preventing secondary collisions and inertial slip.

2) Fault safety, power outage must be locked

In case of sudden situation such as abnormal control system, communication interruption, battery failure, etc., the electromagnetic brake automatically locks mechanically to prevent the risk of robot slipping, drifting, and collision. Especially on slopes, ramps, and uneven surfaces, it can achieve long-term stable parking and meet industrial safety standards.

3) Zero power positioning, improving battery life and accuracy

Commercial robot spend a lot of time in a stationary, docking, and loading/unloading state. Traditional servo zero speed clamps require continuous power supply, resulting in high heat generation and power consumption; After the electromagnetic brake is locked, the motor is completely powered off, maintaining its position with zero power consumption, eliminating gap creep, and achieving more stable repeated positioning, significantly reducing the overall energy consumption and extending the battery life.

4) Support manual brake release, more convenient operation and maintenance

When there is equipment failure or power outage maintenance, the brake can be quickly released through a manual mechanism, making it easy to drag the robot to a safe area, greatly improving on-site operation and maintenance efficiency, and reducing downtime cost.

3. Typical application scenarios in commercial robot hub motor

Industrial AGV/AMR: warehousing and handling, production line docking, heavy loads, requiring slope parking, high-frequency emergency stop, precise positioning, and electromagnetic brake to provide stable braking and safety assurance.

Commercial service robot: used in low noise, smooth, and high safety scenarios such as delivery, guidance, and cleaning. The electromagnetic brake operates quietly, responds quickly, and has no impact, enhancing the user experience.

Automatic delivery/inspection robot: suitable for outdoor slopes and bumpy roads, with reliable parking and self-locking to prevent accidental sliding and ensure the safety of equipment and public environment.

Special collaboration platform: medical assistance, high-precision assembly, millisecond level braking and zero gap positioning, meeting strict requirements for repeated positioning and collaborative safety.

4. Technical Advantage: Why Commercial Robot Prioritizes Electromagnetic Brake

Electromagnetic brake perfectly matches the core requirements of commercial robots for safety, compactness, energy efficiency, precision, and easy maintenance, becoming a standard technology for wheel hub motors.

5. The Development Prospects of Electromagnetic Brake for Commercial Robot

As mobile robot evolves towards higher speeds, larger loads, higher safety, and greater intelligence, electromagnetic brake will be upgraded from a "passive holding brake" to an intelligent braking system, ushering in a broader application space.

1) Security standards upgrade, market demand continues to grow

ISO 10218, ISO/TS 15066 and other human-machine collaborative safety standards are constantly tightening, with emergency stop performance, fault safety, and dynamic braking becoming entry barriers. Electromagnetic brake, with its self-locking and millisecond response characteristics, has become a must-have configuration for commercial robot chassis, and its market penetration continues to increase.

2) Integration and integration have become mainstream trends

In the future, hub motor will further develop towards highly integrated driving braking sensing control. ZLTECH is promoting the deep integration of electromagnetic brake with motor, encoder, and driver, achieving smaller size, higher protection, stronger thermal management, and adapting to high-density and high dynamic working conditions.

3) Intelligence and digitalization empower predictive operations and maintenance

The next generation of electromagnetic brake will be built with temperature, current and wear sensors, and combined with edge computing to achieve status monitoring, life prediction and fault warning, from "replacement after failure" to "preventive maintenance", to improve the reliability and attendance of the robot.

4) Breakthroughs in low power consumption, new materials, and lightweight design

Low power coils, high-performance friction materials, and ultra-thin structures continue to iterate, making electromagnetic brakes more energy-efficient, wear-resistant, and lightweight, further extending range and improving maneuverability, meeting the needs of new scenario such as humanoid robot and lightweight commercial robot.

5) Domestic substitution accelerates, with Zhongling Technology leading the technology landing

The supply chain of commercial robot is accelerating localization, and ZLTECH relies on research and manufacturing advantages to achieve mass delivery of integrated solutions for hub motor and electromagnetic brake. Its performance benchmarks international brands, with better costs, faster delivery times, and closer services to end customers, helping domestic commercial robots enter the global market.

6. Conclusion: Safety and accuracy start from the wheel

Electromagnetic brake is no longer an accessory of robot wheel hub motor, but a core component based on the reliable principle of electromagnetic+spring, which determines the safety bottom line, accuracy upper limit, and endurance. ZLTECH focuses on the research and manufacturing of commercial robot wheel hub motors, adhering to the integration of electromagnetic brake technology into motor design, providing safe, accurate, energy-saving, and reliable integrated power solutions for AGV/AMR, service robots, automatic distribution, and other scenarios.

In the future, ZLTECH will continue to deepen the integration and innovation of electromagnetic brake and wheel hub motors, and use smarter, more compact, and safer products to help commercial robots land stably in more scenarios, promoting the high-quality development of the mobile intelligent equipment industry. For more details about electromagnetic brakes, please follow www.robotmotor.com.