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Hysteresis brakes generate braking torque through the magnetic hysteresis of a steel rotor disc — no friction surfaces, no physical contact between rotating and stationary components. When DC current is applied to the coil, a magnetic flux field magnetizes the hysteresis disc. The drag force between the disc and the magnetic field generates braking torque. Torque is directly proportional to coil current and is independent of shaft speed across the full operating RPM range. When current is removed, the flux dissipates and the brake releases. The only wearing components are the bearings.
This is the electromagnetic variant of the hysteresis principle — the coil must be energized to generate torque. This distinguishes the HB from the Ogura PHT series, which uses permanent magnets and requires no power at all. The HB is the correct choice when torque needs to be electrically controlled and varied during operation. The PHT is the correct choice when a fixed, passive drag torque is needed with no power source.
Because torque is smooth, consistent, and repeatable under identical current conditions, hysteresis brakes are the standard choice for motor test stands, robotic joint load simulation, wire and filament tension control at very low torque levels, and any application where a friction-based approach would introduce torque variation from wear or surface condition changes.
Electromate carries the Ogura HB series electromagnetic hysteresis brake. Torque range is 0.12 to 1 Nm (1.1 to 8.9 in-lbs) at 24 VDC. Units mount in horizontal or vertical orientation with no adjustment required — no air gap to set.
A hysteresis brake generates braking torque by magnetizing a steel hysteresis disc with an electromagnetic field. As the disc rotates through the field, magnetic drag resists rotation and produces torque. There is no physical contact between the rotating disc and the stationary field assembly. Torque is directly proportional to the applied coil current and is independent of shaft speed. When current is removed, the magnetic field dissipates and the brake releases.
What is the difference between a hysteresis brake and a friction brake?
A friction brake generates torque by clamping friction surfaces together — torque is a function of clamping force and surface condition, both of which change as surfaces wear. A hysteresis brake generates torque magnetically with no contact between parts. Torque is determined by coil current only, is independent of speed, and does not change as the unit ages. Hysteresis brakes have no friction wear and will outlast friction-based units in continuous or high-cycle slip applications.
What is the difference between the Ogura HB and PHT hysteresis brakes?
Both use the hysteresis principle to generate torque without friction contact. The HB is electromagnetic — it requires DC current to generate torque and torque is electrically variable during operation. The PHT uses permanent magnets — no electrical connection is required and torque is mechanically adjustable by the user but not variable during operation. The HB is the correct choice when torque must be controlled electronically. The PHT is the correct choice when a fixed passive drag torque is needed with no power source.
What applications use hysteresis brakes?
Hysteresis brakes are used in motor and gearbox test stands, robotic joint load simulation, dynamometer loading, wire and filament tension control, lab instruments, and any application requiring smooth, consistent, repeatable torque without friction-based variation. The absence of wear particles makes them suited for clean environments including medical equipment and precision instruments.
What is the torque range of the Ogura HB series?
The Ogura HB series covers a torque range of 0.12 to 1 Nm (1.1 to 8.9 in-lbs) at 24 VDC. Units mount horizontally or vertically with no air gap adjustment required. For higher torque hysteresis braking requirements, contact Electromate to discuss application-specific options.
Can hysteresis brake torque be adjusted during operation?
Yes. Torque output is directly proportional to coil current. Varying the current varies the torque in real time. Once current is held stable, torque remains constant regardless of slip speed. This makes hysteresis brakes suitable for applications requiring programmable or dynamically adjusted load torque such as motor testing and robotic simulation.
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