The **MEH28XAG-R** is a specific model of an **Electromagnetic Brake** (clutch-brake component), typically manufactured by companies like **Miki Pulley**. These components are essential in industrial automation for controlling the motion of rotating shafts. --- ### 1. Technical Specifications The "MEH" series generally refers to high-torque, dry-type electromagnetic brakes. Below are the typical electronic and mechanical characteristics: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Electromagnetic Spring-Applied Brake | | **Rated Voltage** | DC 24V (Most common variant) | | **Power Consumption** | Approx. 15W - 25W (varies by coil) | | **Static Friction Torque** | ~2.8 Nm to 4.0 Nm | | **Response Time** | Fast-acting (typically < 40ms) | | **Bore Diameter** | Specific to the "28" frame size | --- ### 2. Core Electronic Components The device functions through a combination of electromagnetic theory and mechanical friction. #### A. The Electromagnetic Coil * **Function:** Acts as an inductor. When DC current flows through the copper windings, it creates a magnetic field. * **Electronic Characteristic:** It has a specific resistance ($R$). When selecting a power supply, you must ensure the amperage ($I = V/R$) is stable. #### B. The Armature Plate * **Function:** A metal plate that is physically moved by the magnetic force. * **Mechanism:** In a "Spring-Applied" model, the magnetic field pulls the armature away from the friction disc to **release** the brake. When power is cut, springs push the armature back to **engage** the brake (Fail-safe mode). #### C. Protective Circuits (External) Since the brake is an inductive load, it requires specific electronic protection: * **Flyback Diode:** Placed in parallel to prevent voltage spikes when the power is switched off. * **Varistor:** Often used to suppress surges and protect the switching PLC or Relay. --- ### 3. Application Use-Cases The MEH28XAG-R is designed for precision stopping in small-to-medium machinery: 1. **Robotic Arms:** Holding position during power loss. 2. **Conveyor Systems:** Precise stopping to align items for sensors. 3. **Medical Equipment:** Silent and reliable locking of adjustable beds or imaging tables. --- ### 4. Wiring Diagram Concept ```mermaid graph LR A[DC Power Supply 24V] --> B[Switch/Relay/PLC] B --> C[MEH28XAG-R Coil] C --> D[Ground] B -- Parallel Connection -- E[Flyback Diode] ``` ---