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Electromagnetic Spring Actuated Brakes

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Electromagnetic Spring Actuated Brakes | Spring Loaded Brake

A spring actuated electromagnetic brake provides reliable braking when the power is disengaged and excellent performance in long-term holding applications. In a spring actuated, or spring loaded, brake, compression springs push the armature plate into the friction disc when power is disengaged. This feature provides fail-safe braking, and allows the brake to maintain position over long periods of time, thus preventing machinery from “coasting” when powered off.

Miki Pulley Spring Actuated Brakes

Miki Pulley manufactures a full line of electromagnetic spring actuated brakes, with different models and sizes available for braking, holding, or both braking and holding. Advantages of our SL brake lineup include:

  • Quiet operation
  • High holding torque
  • Space saving, low profile designs
  • Long service life
  • Stable, reliable braking power
  • Manual release mechanisms
BXW Model Spring Actuated Brakes
BXL Model Spring Actuated Brakes BXH Model Spring Actuated Brakes BXR-LE Model Spring Actuated Brakes BXR Model Spring Actuated Brakes

BXW model

BXL model

BXH model

BXR-LE model

BXR model


BXW Model Spring Actuated Brakes

BXW Model Spring Actuated Brakes

The BXW spring actuated brake is used for braking, holding, and braking and holding. Three sub-models are available: L-Type (for braking), H-Type (for braking and holding), and S-Type (for holding only).

These SL Brakes function at a full torque rating right out of the box; no “running in” is required to season the abrasive element. To combat noise, a strategically placed flat spring reduces the clatter produced by small vibrations during high speed rotation.

  • Brake torque: 0.88 ft/lb to 0.369 ft/lb (0.12Nm to 5.2Nm)
  • Brake outer diameter: 1.457” to 2.953” (37mm to 75mm)
  • Ambient temperature: 14°F to 104°F (-10°C to 40°C)

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BXL Model Spring Actuated Brakes

BXL Model Spring Actuated Brakes

The compacted BXL spring actuated brake is designed exclusively for braking. The braking element is designed for a long service life with high wear resistance. Upon braking, torque fluctuation is minimal, even when stopped from maximum RPM. Excessive noise during braking is reduced by use of a flat spring strategically placed on the rotor hub.

  • Brake torque: 1.475 ft/lb to 16.226 ft/lb (2Nm to 22Nm)
  • Brake outer diameter: 3.268” to 76.221” (83mm to 158mm)
  • Ambient temperature: 14°F to 104°F (-10°C to 40°C)

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BXH Model Spring Actuated Brakes

BXH Model Spring Actuated Brakes

The BXH spring actuated brake is designed primarily for emergency braking and holding. Dimensionally, it is the same as the BXL. However, it provides double the operating torque for dynamic braking purposes. This SL brake will function at full torque rating right out of the box—no “running in” is required to season the abrasive element.

  • Brake torque: 2.950 ft/lb to 32.452 ft/lb (4Nm to 44Nm)
  • Brake outer diameter: 3.268” to 76.221” (83mm to 158mm)
  • Ambient temperature: 14°F to 104°F (-10°C to 40°C)

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BXR-LE Model Spring Actuated Brakes

BXR-LE Model Spring Actuated Brakes

This spring actuated, normally ON type brake features a custom power controller that allows a split-second of 24VDC power to overcome spring inertia, then steps down to a power-saving 7VDC. This is ideal when exploring overall energy cost savings, while mitigating heat buildup in the stator. The BXR-LE (Low-Energy) spring loaded brake also features a compact, flat design, with a 3-hole bolt circle for mounting. Press fit rotor hub key or a set-screw type rotor hub key shaft connection options are available.

  • Brake torque: 0.044 ft/lb to 2.36 ft/lb (0.06Nm to 3.20Nm)
  • Brake outer diameter: 1023” to 2.08” (26.0mm to 71.0mm)
  • Ambient temperature: 14°F to 104°F (-10°C to 40°C)

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BXR Model Spring Actuated Brakes

BXR Model Spring Actuated Brakes

The BXR spring actuated brake can serve as a dynamic brake as well as a holding brake. The unique, low profile design is 2/3 the thickness of our other BX brakes. Saving space is key, as is reducing overall length in a brake/servomotor combination. Weight is also dramatically reduced. This is important with cantilevered loads, such as those typically seen in robotic arm applications. To top off all these features, the energy saving design reduces the temperature buildup of the coil.

  • Brake torque: 3.688 ft/lb to 40.566 ft/lb (5Nm to 55Nm)
  • Brake outer diameter: 3.287” to 7.280” (83.5mm to 185mm)
  • Ambient temperature: 14°F to 104°F (-10°C to 40°C)

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Contact Us for Failsafe Braking Solutions

Miki Pulley’s power-on, spring applied electromagnetic brakes deliver reliable performance in dynamic braking and long-term holding applications. Request a quote on spring actuated brakes, or contact us for more information.