Delta ECMA-C20807SS ASDA-B2 Series AC Servo Motor (750W)

Product Overview

The ECMA-C20807SS (ECMA C20807SS) is a high-performance AC Servo Motor from Delta's ASDA-B2 series, engineered for precision motion control and high dynamic response. Delivering a rated power output of 750W at a rated speed of 3000 rpm, this motor is a staple in industrial automation for applications such as CNC machining centers, automated packaging lines, and textile machinery. The ECMA-C20807SS features an 80mm frame size and is equipped with an integrated mechanical brake and oil seal, making it ideal for vertical axis applications where preventing "back-drive" during power loss is critical. With its 17-bit incremental encoder, it provides the high-resolution feedback necessary for smooth velocity regulation and accurate positioning.

Technical Configuration

The ECMA-C20807SS is built with a high-flux permanent magnet rotor that achieves a remarkable power rating of 50.4 kW/s and a mechanical time constant of just 0.63 ms. This allows for near-instantaneous acceleration and deceleration cycles. The motor's "SS" configuration denotes a specific hardware setup: it includes a 14mm shaft with a keyway and screw hole, a built-in holding brake, and a high-grade oil seal to prevent the ingress of lubricants or coolants into the motor windings. Its Class B insulation (CE) ensures reliable performance in standard industrial temperatures, while the low armature resistance (0.42 Ohm) and inductance (3.53 mH) optimize energy efficiency and thermal stability during high-duty cycles.

Technical Specifications

Technical FAQs

Why is the built-in brake important for this motor model?

The "S" in the suffix indicates a motor with a holding brake. This is a friction brake designed to hold the load in position when the motor is powered off. It is essential for vertical Z-axis applications to prevent the tool or load from falling due to gravity during an emergency stop or power failure.

Can I use the ECMA-C20807SS in environments with oil mist?

Yes. This motor includes a factory-installed oil seal. This seal protects the internal bearings and encoder from oil and liquid spray commonly found in gearbox-mounted applications or CNC environments.

What servo drive is compatible with this motor?

The ECMA-C20807SS is designed to be paired with the Delta ASDA-B2 series servo drives, specifically the 750W rated drives (e.g., ASD-B2-0721-B). Always ensure the drive power rating matches or exceeds the motor's 750W requirement.

Engineering & Installation Guide

• Brake Power Supply: The holding brake requires a dedicated 24V DC power supply. Do not share the same power supply with the PLC or sensors, as the inductive kickback from the brake coil can cause electrical noise. Use a dedicated relay controlled by the servo drive's "Brake Release" (BRKR) output.

• Shaft and Coupling: When installing a coupling on the 14mm keyway shaft, avoid using a hammer or applying excessive axial force, as this can damage the high-resolution 17-bit encoder at the rear of the motor. Use a puller or assembly tool for a precise fit.

• Oil Seal Maintenance: While the oil seal provides excellent protection, ensure that the oil level in any connected gearbox does not submerge the seal completely. The seal is designed to withstand splashes and mist; total submersion may eventually lead to seepage over years of operation.