The **REB-B2-R** is a specific model of a **magnetic brake** (often categorized as an electromagnetic friction brake) manufactured by companies like **Miki Pulley**. These components are widely used in industrial automation to hold a load in place or stop a shaft when power is disconnected. --- ### 1. Key Electronic & Physical Components The REB-B2-R operates on electromagnetic principles. Below are the primary internal parts: | Component | Function | Material/Detail | | :--- | :--- | :--- | | **Field Coil (Stator)** | Generates a magnetic field when energized. | Copper windings encased in a steel housing. | | **Armature Plate** | A movable metal plate that is attracted to the magnet. | High-permeability steel. | | **Friction Disc** | Provides the braking torque through friction. | Non-asbestos friction material. | | **Springs** | Provides the mechanical force to engage the brake. | Compression-style steel springs. | | **Hub** | Connects the rotating shaft to the brake mechanism. | Keyed steel or aluminum. | --- ### 2. Operating Mechanism The REB series typically functions as a **Power-Off Brake** (Spring-applied). * **State: Power OFF:** The internal springs push the armature plate against the friction disc. This squeezes the disc against the mounting surface, creating friction that prevents the shaft from turning. * **State: Power ON:** The field coil is energized, creating an electromagnetic force. This force pulls the armature plate away from the friction disc, overcoming the spring tension. The disc is then free to rotate with the shaft. --- ### 3. Technical Specifications (Typical) While exact specs can vary by specific sub-versions, the "B2" series generally follows these parameters: | Parameter | Value / Range | | :--- | :--- | | **Voltage** | Usually 24V DC (Standard) or 90V/180V DC | | **Torque** | Approx. 0.2 Nm to 2.0 Nm (depending on size) | | **Power Consumption** | Low (typically < 15 Watts) | | **Response Time** | Fast (milliseconds) | --- ### 4. Critical Considerations for Integration When working with the electronic parts of the REB-B2-R, keep the following in mind: 1. **Polarity:** DC brakes are usually not polarity-sensitive, but check the lead wire coloring. 2. **Flyback Diode:** Because the coil is an **inductor**, it can cause a voltage spike when power is cut. A flyback (freewheeling) diode should be placed across the leads to protect your controller or PLC. 3. **Air Gap:** The distance between the armature and the coil must be maintained. If the gap becomes too large due to wear, the magnet may not be strong enough to pull the armature, causing the brake to drag. ---