The **EMMS-AS-70-S-HS-RMB** is a high-performance AC synchronous servo motor manufactured by Festo. This specific model is part of their standard motor series designed for precision motion control in industrial automation. --- ## 1. Technical Specifications Overview Below are the primary electrical and mechanical specifications for this specific variant: | Parameter | Specification | | :--- | :--- | | **Motor Type** | AC Synchronous (Brushless) | | **Flange Size** | 70 mm | | **Output Power** | High-performance (HS) | | **Feedback System** | Absolute Encoder (Multi-turn) | | **Brake Option** | Integrated Holding Brake (B) | | **Nominal Voltage** | 360 V DC | | **Nominal Current** | 1.8 A | | **Peak Current** | 10.3 A | | **Nominal Torque** | 1.45 Nm | | **Protection Class** | IP65 (Housing and Connection) | --- ## 2. Key Electronic Components ### A. Feedback System (Absolute Encoder) The "RM" designation indicates a **Multi-turn Absolute Encoder**. - **Function:** It tracks the exact position of the motor shaft within a single revolution and counts the number of total revolutions. - **Benefit:** Unlike incremental encoders, it does not require a "homing" run after a power failure, as it remembers its absolute position electronically. - **Protocol:** Typically uses a digital interface (like EnDat or Hiperface) to communicate with the motor controller. ### B. Integrated Holding Brake The "B" designation indicates an integrated **Electromagnetic Brake**. - **Operation:** This is a "fail-safe" brake. It is released when 24V DC is applied and engages (locks the shaft) when power is removed. - **Purpose:** Prevents the motor axis from falling or moving due to gravity or external forces when the system is powered down or in an emergency stop state. ### C. Winding and Power Electronics - **HS (High Speed/Performance):** The internal copper windings are optimized for higher RPM and torque density. - **3-Phase Stator:** Uses a brushless design, reducing electronic noise and mechanical wear. - **Temperature Sensor:** Includes an integrated PTC or NTC thermistor to monitor winding temperature and prevent thermal burnout via the motor controller. --- ## 3. Connection and Integration The motor features two M23 circular connectors for electronic interfacing: 1. **Power Connector:** * 3 phases (U, V, W) * Protective Earth (PE) * 2 pins for the 24V Brake control. 2. **Encoder Connector:** * Signal wires for position data. * Power supply for the encoder electronics. * Temperature sensor leads. --- ## 4. Part Number Breakdown ```text EMMS-AS - 70 - S - HS - RM - B | | | | | | | | | | | | | +-- Holding Brake | | | | | +------- Multi-turn Absolute Encoder | | | | +------------ High Speed / Performance | | | +----------------- Short Length (Stack size) | | +--------------------- Flange Size (70mm) | +-------------------------- AC Synchronous +------------------------------- Motor Series ```