Electromagnetic brakes
Precise braking, arriving safely
Electromagnetic brake solutions for demanding applications in vehicle technology, industry and mechanical engineering.
Design & engineering
The right electromagnetic brake depends on the torque, the installation space, the switching behaviour and the safety requirements. With KNOTT Vortex, KNOTT combines its own application expertise with the specialist knowledge of an experienced partner for electromagnetic brakes and clutches. In this way, suitable brake concepts are created for demanding applications and special solutions as well.
Depending on the requirement, different designs and versions are available. Brakes can therefore be designed for reliable performance, fast response and a long service life, for demanding industrial environments as well. If a standard solution is not enough, KNOTT develops customer-specific versions, matched to the technical requirements and the available installation space.
Fail-safe
Spring-applied brakes close when the power supply is interrupted and provide a safe hold.
Braking and holding reliably
For defined braking and holding functions in the most varied applications.
High braking torque in a compact installation space
Powerful brakes for applications in which torque and installation space are equally decisive.
Positioning precisely
For safety and controlled braking of drives.
Negative brake / spring-applied brake:
In the de-energised state the brake is closed by spring force and holds the torque. It is opened electromagnetically to release it. The fail-safe principle makes it particularly suitable as a holding, parking and emergency brake for safety-relevant drives.
Available sizes:Ø 37 - 500 mm
Braking torques:up to 1,500 Nm
Positive brake / power-applied brake:
The brake is activated by applying current and is released in the de-energised state. It is suitable for targeted braking and positioning, for example to stop drives under load.
Because of its design, it is not a safety brake.
Available sizes: Ø 37 - 500 mm
Braking torques: up to 1,500 Nm
The KNOTT electromagnetic brakes at a glance
Spring-applied, fail-safe brakes developed for reliable holding and emergency braking. If the power drops, the power supply is activated automatically.
ERA
The ERA is a compact electromagnetic brake for reliable holding and defined braking functions. The friction surface on both sides allows a high braking performance in a compact design.
- Electromagnetically released and spring-applied
- Fail-safe function if the power is interrupted
- Low-wear friction linings
- Insulation class H for ambient temperatures up to 180 °C
- Pre-set air gap for simple and fast installation
- Braking torque: up to 1,500 Nm
Possible applications: cranes, hoists, electric forklift trucks, brake motors, autonomous robots, lifts, industrial trucks and municipal vehicles.
ERB
The ERB is a spring-applied electromagnetic brake with integrated manual release.
- Spring-applied and electromagnetically released version
- Fail-safe function if the power supply is interrupted
- Manual release available for all sizes
- Can be fitted at the factory or retrofitted
- Automatic resetting of the spring-loaded hand release
- Friction surfaces on both sides for reliable braking and holding
- Low-noise version optional
- Various versions for protection against dust and moisture
- Monitoring of the manual release by microswitch possible
- Special voltages and customer-specific bores on request
- Braking torque: up to 1,500 Nm.
Depending on the version, protection classes up to IP66 and different voltages and connection variants are available. Fields of use include cranes and hoists, electric forklift trucks, brake motors, autonomous mobile robots, lifts and industrial trucks.
ERC
The ERC is a spring-applied electromagnetic brake with manual release and adjustable braking torque. In the de-energised state the brake is closed by spring force. It is opened electromagnetically to release it. The torque setting lets you adapt the braking effect specifically to the particular application.
Spring-applied, electromagnetically released fail-safe brake
- Braking torque adjustable through the torque setting nut
- Manual release for maintenance and particular operating situations
- Friction surfaces on both sides for reliable braking and holding
- Monitoring of the air gap and of wear optionally possible
- Monitoring of the manual release optionally possible
- Low-noise and corrosion-protected versions available
- Protection variants up to IP65 and IP66
- Braking torque: up to 1,500 Nm
Depending on the size and version, different voltages, protection classes and monitoring options are available. Fields of use include cranes and hoists, electric forklift trucks, brake motors, autonomous mobile robots, lifts, industrial trucks and municipal vehicles.
ERG
The ERG is a compact, spring-applied electromagnetic brake with a friction surface on both sides. Its flange design allows it to be integrated into drives and machines while saving space. In the de-energised state the brake is closed by spring force and is opened electromagnetically to release it.
- Friction surfaces on both sides for reliable braking and holding
- Compact flange design for small installation spaces
- Low-wear, asbestos-free friction linings
- Braking torques from 0.12 to 400 Nm
- Insulation class H for temperatures up to 180 °C
- 24 V DC as standard, further voltages available
- Optional manual release
- The smaller sizes can be fitted from either side
- Customer-specific versions can be realised, for example as a particularly flat pancake brake
The ERG series is available in 13 sizes and is suitable for stairlifts, autonomous mobile robots, electric forklift trucks, cranes and hoists, conveying technology and woodworking machines, among other things.
ERH
The ERH is a compact, spring-applied electromagnetic brake for electrically driven vehicles and machines. In the de-energised state the brake is closed by spring force and is opened electromagnetically to release it. The narrow design allows space-saving integration, while different friction materials can be matched to the particular braking task.
- Narrow and compact design
- Designed for parking and emergency braking functions
- Variants for high static holding torques
- Variants for high dynamic emergency braking torques and a long brake service life
- Different friction materials for application-specific requirements
- Versions with or without a release lever
- Protection classes from IP43 to IP67 available
- Reduced power consumption through dual-voltage supply or PWM control
- Braking torque: from 10 to 200 Nm
Depending on the version, different protection classes, mounting variants and actuation options are available. Fields of use include electric and golf carts, mobile elevating work platforms, electric forklift trucks, mobile cranes, construction machinery, order picking vehicles and municipal vehicles.
ERM
The ERM is a spring-applied electromagnetic brake for demanding applications with increased requirements on protection and operational safety. The closed housing with protection class IP66 protects the brake reliably against dust and water.
- Fail-safe function
- Protection class IP66
- Friction surfaces on both sides for reliable braking and holding
- Insulation class H
- Optionally with hand release
- Noise-reduced rotor version available
- Increased corrosion protection optional
- Optionally with a microswitch and preparation for a rotary encoder
- Compact variants with a thin adapter flange available
- Different friction materials for application-specific requirements
- Braking torque: from 5 to 260 Nm
For special solutions, static holding torques up to 320 Nm are possible. Depending on the application, variants for dynamic braking, holding functions with emergency stop and customer-specific requirements are available.
ERN
Spring-applied
electromagnetic brake for wheel drive units, between the motor and the gearbox.
Single-disc friction brakes
Powerful brakes that are activated by applying current. For safe and controlled stopping and holding of machines and automation systems.
EAA
The EAA is a compact, electromagnetic single-disc brake for precise industrial movement sequences. In the energised state it generates the braking torque and is particularly suitable for applications with high speeds.
- Electromagnetic single-disc brake, normally off
- Compact design for industrial applications
- Backlash-free torque transmission
- High idling speeds through complete separation of the friction surfaces
- Low-wear, asbestos-free friction surfaces
- Braking torques from 1.5 to 2,880 Nm
- 24 V DC as standard, further voltages available
- Different bores and mounting geometries possible
- Designed for dry operation
- Insulation class H up to 180 °C
- Manufactured and tested to DIN VDE 0580, CE certified
The EAA is suitable for industrial, packaging, printing and textile machines, conveying technology, machine tools, automation and motion control systems, among other things.
EAR
The EAR is an electromagnetic single-disc brake with metallic friction surfaces for high torques in a compact design. It is suitable for both dry and wet operation and can also be used where oil or grease is present.
- Compact design with a comparatively large bore
- Metallic friction surfaces for dry and wet operation
- High torques in a compact size
- Maintenance-free version
- Suitable for horizontal and vertical mounting
- Braking torques up to 400 Nm dry, up to 160 Nm wet
- Dynamic braking torques up to 320 Nm dry
- 24 V DC as standard, further voltages available
- Sizes 0.05 to 32, larger sizes on request
- Customer-specific versions and mountings possible
- Insulation class H up to 180 °C
The EAR is suitable for machine tools, industrial machines, conveying technology and packaging and printing machines, among other things.
Permanent magnet brake
Permanent magnet brakes: reliable braking force through integrated permanent magnets, without a continuous supply of energy.
PMB
Permanent magnet brakes are compact, electromagnetically released holding brakes for precise drive and positioning applications. Their small size and high power density make them particularly suitable for servo motors and automated systems.
- Compact design for small installation spaces
- High torques in a small installation space
- Precise holding and positioning
- Fast reaction times
- Energy-efficient through de-energised braking
- Braking torques from 0.4 to 130 Nm
- 24 V DC as standard, further voltages available
- Various designs and customer-specific versions
Permanent magnet brakes are suitable for servo motors, robotics, automation and motion control applications, among other things.
FREQUENTLY ASKED
QUESTIONS.
What is the difference between a positive and a negative brake?
The positive brake brakes when current is applied; the negative brake closes under spring force in the de-energised state and therefore works on the fail-safe principle.
Which designs does Knott offer?
KNOTT offers various designs and versions of electromagnetic and permanent magnet brakes. These range from standard and narrow designs through brakes for installation between the motor and the gearbox to multi-stage and customer-specific solutions. Depending on the application, additional manual actuation or combinations with hydraulic braking systems are also possible.
Which sizes and braking torques are available?
Our customer-specific adaptations in terms of torque, voltage and size. Variable design from 24V DC to 205V.
Which applications are the brakes suitable for?
Above all for electrically driven vehicles, industrial trucks, industrial vehicles, agriculture and mechanical and plant engineering.
How do I select the right electromagnetic brake?
The selection depends on several factors: torque, speed, voltage, shaft size, duty cycle, mounting arrangement, operating temperature and safety requirements. Please feel free to contact us so that we can support you with your requirements and your selection.
Where are electromagnetic brakes frequently used?
Electromagnetic brakes are used in motors, conveyor belts, lifts, machine tools, packaging equipment and automation systems. They support precise stopping, positioning and load holding.
Have the right electromagnetic brake
designed for you
Speak to our technical sales team directly. Describe your requirements and we will develop the right solution.
