Electric Motor Brakes

Electric motor brakes are critical safety components that decelerate or securely hold motor loads when power is intentionally cut or accidentally lost. With over 50 years of specialized experience, KEB has established itself as a leading manufacturer of high-quality motor brake solutions for demanding industrial applications.

This guide explores KEB’s motor brake technology, custom design capabilities, and the value we deliver to motor OEMs across North America.

 

 

Why Motor Brakes Matter

In industrial applications, unexpected power loss can create dangerous situations with rotating machinery, falling loads, or runaway equipment. Motor brakes provide essential safety by:

• Preventing accidents when power fails unexpectedly
• Enabling precise positioning for automated systems
• Protecting equipment from damage during emergency stops
• Meeting safety regulations for industrial machinery

 

DC Spring-Set Brakes: The Superior Choice

KEB specializes in the design and manufacture of DC spring-set brakes, which offer significant advantages over traditional AC brake systems.

 

Key Advantages of DC Brakes

Simplified Operation

• No complex mechanical linkages required
• Fewer components mean higher reliability
• Direct electromagnetic operation for consistent performance

Reduced Maintenance Requirements

• Fewer adjustments needed over the brake’s lifetime
• Less ongoing maintenance compared to AC systems
• Longer service intervals reduce downtime

Superior Durability
When replacing AC brakes in high-cycling applications, DC brakes consistently outperform their AC counterparts. The solenoids and linkages in AC brake systems often fail prematurely under demanding conditions, while DC spring-set brakes handle the abuse and wear much more effectively.

 

 

How KEB Spring-Set Motor Brakes Work

Our DC spring-set brakes operate on a fail-safe principle:

• Power On: Electromagnetic coil energizes, compressing springs and releasing the brake
• Power Off: Springs engage the brake automatically, providing secure holding force
• Emergency Stop: Instant braking action occurs during any power loss

 

Flexible Voltage Options

KEB brake coils can be wound for any voltage requirement, including:

• 12VDC and 24VDC for battery-powered machines
• Standard industrial voltages for facility power systems
• Custom voltages for specialized applications

For facilities with AC power, our bridge rectifier easily converts AC to DC power for optimal brake operation.

 

 

Engineered for Tough Industrial Applications

KEB brakes are specifically designed to handle the most demanding industrial environments. Our commitment to quality includes:

 

Built-in Safety Factors

• Friction linings with generous safety margins
• Coil voltage tolerance designed to handle power fluctuations
• Robust construction for safety-critical applications

 

Industry Certifications

• CSA listed as standard
• UL certification available when specified
• NEMA 4 protection for harsh environments

 

 

Specialized Brake Solutions

Environmental Protection

• IP65 brakes for washdown applications and outdoor installations
• Moisture-resistant designs for humid environments
• Corrosion-resistant materials for chemical processing

High-Performance Applications

• High-energy brakes for stopping large loads repetitively
• Silent brakes for theater hoists and noise-sensitive elevator motors
• Precision brakes for robotics and automation systems

Custom Solutions
With decades of experience, we’ve likely already developed a solution for your specific application requirements.

 

 

Flexible Mounting Options

Our Minnesota-based engineering design team can customize brake mounting to meet any motor design requirement.

 

Standard Mounting Configurations

External Mounting

• Brake assembly mounts to prepared end bell or mounting flange
• Easy serviceability and maintenance access
• Optional KEB-supplied mounting flanges or NEMA C-Face adapter plates

Internal Mounting

• Brake integrated inside motor housing (ideal for servo motors)
• IP65 protection for harsh environments
• Best suited for holding brake applications
• Note: Limited serviceability due to internal location

 

Custom Mounting Solutions

Extended Wiring Options

• Extra-long leadwires for difficult installations
• Special connectors for quick disconnection
• Custom cable management solutions

Specialized Hardware

• Custom hubs and rotors for unique shaft configurations
• Step or snap ring mounting features
• Application-specific fastening systems

 

Double C-Face Brakes: Modular Flexibility

The KEB Type 17 Double C-Face Brake offers exceptional versatility for both new installations and retrofits.

 

Key Features

Integrated Design

• Power-off DC spring-set operation
• Integral NEMA input and output flanges
• Through-shaft design for inline mounting

Installation Flexibility

• Mounts between NEMA C-Face motor and gearbox
• Modular design allows individual component servicing
• Compatible with 56C through 286TC NEMA motors

Standard Features

• Multiple magnet voltage options
• Integrated conduit box for easy wiring
• NEMA 4 environmental protection
• Manual hand release for maintenance

 

 

How KEB’s C-Face Brake Operates

The modular design allows the gearbox, brake, and motor to be serviced or replaced individually, reducing maintenance downtime and costs.

 

 

Beyond Standard Solutions: Specialized Brake Technologies

KEB’s expertise extends beyond spring-set brakes to meet unique application requirements:

 

Alternative Brake Technologies

Permanent Magnet Brakes

• Zero power consumption during operation
• Ideal for energy-conscious applications
• Electromagnetic release mechanism

Power-On Brakes

• Engage when power is applied
• Specialized applications requiring reverse operation
• Custom control integration available

 

 

KEB: Your Trusted North American Brake Partner

Electric motors power countless industrial applications, and most require reliable braking systems. KEB’s combination of experience, quality, and local capabilities makes us the ideal partner for your motor brake needs.

Local Capabilities

• 150,000 sq ft. ISO 9001:2015 certified design and production facility in the United States
• Shorter lead times for North American customers
• Direct technical support and engineering consultation

Quality Commitment

• Highest quality materials and manufacturing processes
• Comprehensive testing and quality assurance
• Long-term reliability in demanding applications

Engineering Support
Our experienced engineers are ready to help specify the correct brake for your application, whether it’s a standard solution or a completely custom design. We work closely with motor manufacturers to ensure seamless integration and optimal performance.

Ready to explore how KEB motor brakes can enhance your application’s safety and performance? Our team of experts is standing by to help you find the perfect braking solution. Contact us today to learn more about our industrial automation solutions and how to commission them for your specific application.