The **EMMS-AS-70-M-LS-RMB** is a high-performance AC synchronous servo motor manufactured by Festo. It is part of the EMMS-AS series, designed for precise positioning and motion control applications. ### 1. Technical Specifications Overview The electronic characteristics of this motor define its power requirements and performance capabilities. | Parameter | Specification | | :--- | :--- | | **Motor Type** | AC Synchronous Servo Motor | | **Nominal Voltage (DC)** | 360 V | | **Nominal Current** | 2.2 A | | **Peak Current** | 10.3 A | | **Nominal Power** | 682 W | | **Max. Speed** | 6,600 rpm | | **Insulation Protection** | Class F (up to 155°C) | --- ### 2. Breakdown of the Electronic Components The part number itself identifies specific electronic and hardware features: * **70**: Represents the flange size (70 mm). * **M**: Length code (Medium), affecting the internal winding and torque capacity. * **LS**: **Low Spacing** / Plug orientation (Lateral/Straight connection options). * **R**: **Rotary encoder type**. In this model, "R" typically signifies a **Multi-turn absolute encoder (Hiperface)**. * **M**: Integrated mechanical **Holding Brake** (24V DC). * **B**: Standard generation/design indicator. ### 3. Key Electronic Subsystems #### A. The Encoder (Feedback System) The "R" designation refers to a digital absolute encoder. Unlike incremental encoders, this electronic component remembers the motor's position even after a power loss. - **Protocol:** Often uses the Hiperface or similar digital interface. - **Precision:** Provides high-resolution feedback to the motor controller (Servo Drive) for closed-loop logic. #### B. Integrated Holding Brake The "M" in the suffix indicates an internal electronic brake. - **Operation:** It is a spring-loaded brake that releases when **24V DC** is applied. - **Safety:** It acts as a fail-safe; if power is lost, the brake engages to prevent the load from falling or moving. #### C. Winding and Thermal Protection - **Windings:** 3-phase AC brushless design, requiring a sine-wave commutation provided by the motor controller (e.g., Festo CMMT-AS or CMMP-AS). - **Thermal Sensor:** Includes an internal temperature sensor (NTC or PTC) embedded in the windings. This sends a signal to the drive to shut down if the motor exceeds its thermal rating, preventing insulation breakdown. ### 4. Connection Interface The motor features two M23 circular connectors: 1. **Power Connector:** 3 phases (U, V, W) + Protective Earth (PE) + 2 pins for the 24V Brake. 2. **Encoder Connector:** Multi-pin connector for the absolute encoder signal and thermal sensor feedback. ---