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Choose a spring-applied, power-off electromagnetic friction brake when a load must be held at rest or braking must engage if electrical power is lost. Choose an eddy-current brake when you need contactless braking force while a load is moving. Because an eddy-current brake provides no braking force at standstill, a machine that must stop and stay stopped needs a separate holding brake.
What is the difference?
The key difference is how each brake creates torque. In a friction brake, electromagnetic force operates friction surfaces. In a common power-off design, springs press the surfaces together to apply the brake, and an electromagnet releases them. KEB describes this arrangement in its Combistop application note.
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An eddy-current brake creates drag without friction contact. Motion through a magnetic field induces currents in a conductor; the resulting electromagnetic effect opposes that motion. Since the effect depends on relative motion, braking falls to zero at standstill. It is a dynamic retarder, not a parking brake. Thomasnet’s technical overview describes this zero-speed limitation.
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Which brake fits the job?
| Application need | Better starting point | Why and what to check |
|---|---|---|
| Hold a vertical axis, hoist, or other load at rest | Spring-applied, power-off friction brake | Springs apply the brake when coil power is removed. Verify rated holding torque and that the complete system meets its safety requirements. KEB |
| Apply braking after electrical power loss | Spring-applied, power-off friction brake | The spring-applied design engages without coil power, but confirm the specific brake and system behavior meet the required safety case. KEB |
| Retard a moving load without friction contact | Eddy-current brake | Industrial examples include crane, hoist, and rail applications. It cannot hold a load once motion stops. EMTorq; Knorr-Bremse |
| Reduce friction-surface wear during repeated dynamic retardation | Evaluate an eddy-current brake | Its non-contact design has no friction surfaces, but the heat generated and actual duty profile still need engineering review. EMTorq |
| Stop a moving load and then hold it | A system with both dynamic retardation and a holding brake | Use an eddy-current brake for motion if appropriate, and a friction brake or other suitable device for zero-speed holding. Thomasnet |
| Continuously control web or material tension | Consider a powder-brake tension-control system | This is an adjacent solution family, not a direct substitute for either brake in every application. Mitsubishi Electric’s 2024 catalog discusses powder-brake operation and current-based tension control. |
What to establish before choosing a model
- Define the job at zero speed. Decide whether the brake must hold a stationary load, stop a moving load, or do both.
- Specify power-loss behavior. Establish whether braking must apply when electrical power is removed or only when the brake is energized. Brake operation depends on its design; confirm the behavior of the chosen product. See Electromate’s overview of power-on, power-off, and spring-applied brakes.
- Determine torque and speed requirements. Establish holding torque, dynamic torque, operating speed range, and the required stopping or retarding duty. These values depend on the machine; the sources do not provide enough information to size a brake without application data.
- Assess duty cycle and heat. A non-contact brake still has thermal limits. Evaluate energy dissipation against the real operating profile; the EMTorq product page does not establish a universal thermal rating.
- Check fit and installation. Confirm shaft or mounting arrangement, available space, and compatibility with the machine. EMTorq lists shaft, flange, and foot-mount forms for its industrial eddy-current brakes.
- Account for wear and maintenance. Friction surfaces are wear parts; KEB notes that dynamic engagement causes incremental wear. An eddy-current design has no friction surfaces, as described by EMTorq.
- Plan for holding after retardation. If the load must remain stationary, specify a separate mechanical holding brake when the selected dynamic retarder cannot provide static holding.
Examples of the product families
- KEB Combistop: A spring-applied friction disc brake. Springs provide holding force and an electromagnet releases the disc; KEB describes static holding at zero speed as typical and notes wear from dynamic engagement. KEB application note
- EMTorq industrial eddy-current brakes: A non-contact product family offered in shaft, flange, and foot-mount forms, with crane, hoist, and load-brake applications listed by the supplier. EMTorq
- Knorr-Bremse rail brakes: The portfolio includes electromagnetic track brakes and EddyAct eddy-current track brakes; the supplier describes eddy-current braking as complementing pneumatic friction brakes, particularly on high-speed trains. Knorr-Bremse
- Mitsubishi Electric powder brakes: A separate adjacent family for tension-control duties, covered in the manufacturer’s 2024 catalog.
These are examples of product families, not model recommendations. A specific selection requires the machine’s torque, speed, duty, power, mounting, and holding requirements.
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