Estun EM3A-04AFA221 400W AC Servo Motor 200V 3000 RPM 1.27 N·m Low Inertia IP65 With Brake 17-bit Absolute Encoder

Estun EM3A-04AFA221 400W low inertia AC servo motor. 200V, 6000 RPM max, 1.27 N·m torque, IP65, with brake, 17-bit absolute encoder. In stock.

1. Product Overview

The Estun EM3A-04AFA221 is a high-performance AC servo motor from Estun's advanced EM3A series. This 400W (0.4kW) model features a low inertia rotor design and is equipped with a holding brake and 17-bit absolute magnetic encoder, making it ideal for high-speed, high-dynamic applications requiring precise positioning and vertical axis holding capabilities.

The EM3A series represents Estun's next-generation low-inertia servo motor line, engineered for high-speed and high-dynamic applications that demand exceptional mechanical rigidity and rapid response times. With a maximum speed of 6000 RPM and IP65 protection as standard, the EM3A-04AFA221 delivers outstanding power density and dynamic performance for a wide range of automation applications.

Key differentiators:

• Low inertia design – optimized for rapid acceleration and deceleration
• 17-bit absolute magnetic encoder – no homing required after power loss
• Holding brake included – essential for vertical axis applications
• IP65 protection – suitable for harsh industrial environments
• Ultra-compact size – 20-40% shorter than competing models

2. Key Technical Specifications

Power & Torque

Electrical Specifications

Mechanical Specifications

Permissible Loads

Performance Specifications

Environmental Specifications

Compatible Servo Drives

3. Core Features & Benefits

Low Inertia Design for High Dynamics
The EM3A-04AFA221 features a low inertia rotor (0.244 kg·cm² without brake), specifically optimized for applications requiring rapid acceleration and deceleration. This low inertia design enables:

• Extremely fast response times for beat-to-beat operations
• Reduced cycle times in pick-and-place applications
• Smooth operation with frequent start/stop duty cycles
• High dynamic performance for demanding automation tasks

300% Overload Capacity
With a peak torque of 3.81 N·m (300% of rated torque), this motor handles demanding acceleration requirements and sudden load fluctuations without stalling. The high overload capacity ensures reliable operation in applications with intermittent high-torque demands.

17-bit Absolute Magnetic Encoder
Equipped with a 17-bit absolute magnetic encoder (131,072 pulses/revolution), the EM3A-04AFA221 delivers exceptional positioning accuracy and eliminates the need for homing after power loss. Key advantages include:

• High-resolution feedback for precise motion control
• Absolute position retention without battery backup concerns
• Simplified startup and enhanced system reliability
• Immediate operational readiness after power restoration

Built-in Holding Brake
The "A" in the model suffix indicates this unit includes a 24V DC holding brake (≥0.32 N·m holding torque). This brake is essential for:

• Vertical axis applications where the load must be held when power is removed
• Z-axis stages in CNC machines and pick-and-place systems
• Robotic arms requiring position maintenance
• Safety-critical applications preventing unintended movement

Ultra-High Speed Operation
With a maximum speed of 6000 RPM (rated speed 3000 RPM), the EM3A-04AFA221 can handle high-speed machining and fast positioning applications, improving machine throughput and cycle times. The series supports up to 7000 RPM for select models.

IP65 Environmental Protection
Rated IP65 as standard, the motor is fully protected against dust ingress and low-pressure water jets from any direction. This makes the EM3A-04AFA221 suitable for:

• Dusty factory environments
• Wash-down conditions in food processing
• Machine tool coolant exposure
• Outdoor or harsh industrial settings

Ultra-Compact Design
The EM3A series features industry-leading compact dimensions, with motor length 20-40% shorter than competing models in the same power class. This space-saving design enables:

• Integration into space-constrained machinery
• Reduced machine footprint
• Lighter overall system weight
• Easier installation in tight compartments

Standard Oil Seal
The motor comes standard with an oil seal, preventing lubricant ingress and making it suitable for gearbox or pulley-coupled applications in lubricated environments.

Excellent Speed Regulation
The EM3A series offers exceptional speed stability with:

• Load regulation: ±0.01% or less (0-100% load change)
• Voltage regulation: 0% (rated voltage ±10%)
• Temperature regulation: ±0.1% or less (25±25°C change)
• Speed control range: 1:5000 for versatile operation

Multiple Control Modes
When paired with compatible Estun drives, the motor supports:

• Position control for precision positioning
• Speed control for velocity-based applications
• Torque control for tension and force-sensitive operations
• EtherCAT communication for multi-axis synchronization

4. Applications

The Estun EM3A-04AFA221 is engineered for high-speed, high-dynamic industrial automation applications requiring low inertia performance and holding brake functionality:

Primary Applications:

• Robotics – Fast and precise movements for assembly, manipulation, and material handling; the low inertia design enables rapid response times critical for robotic applications
• Semiconductor Manufacturing Equipment – Intricate wafer handling, inspection, and processing requiring exceptional precision and reliability
• Crystal Solidification Machines – Precise positioning requirements for crystal growth processes
• Packaging Machinery – High-volume production requiring efficient and dependable motion control
• 3C Equipment (Computer, Communication, Consumer Electronics) – Precision assembly and testing equipment

Additional Applications:

• Direct-Connected Screw Applications – Where high mechanical rigidity is essential for stable and accurate movements
• Pick-and-Place Machines – High-speed component placement with vertical holding requirements (using the integrated brake)
• CNC Machine Tools – Small routers, engraving machines, and PCB drilling equipment
• Medical Equipment – Diagnostic and laboratory automation requiring precise motion control
• Textile Machinery – High-speed winding and yarn tension control systems
• General Automation – Assembly line indexers, positioning stages, and factory automation systems

5. Compatibility & System Integration

Matching Servo Drives

The EM3A-04AFA221 is designed for seamless integration with Estun's servo drive families:

Driver Specifications (ProNet-04A class):

• Continuous Output Current: 2.8 A
• Max. Output Current: 8.4 A
• Main Power Supply Capacity: 0.9 kVA
• DC24V Power Supply Capacity: 30W

Encoder Compatibility

• Standard: 17-bit absolute magnetic encoder (131,072 pulses/rev)
• Optional upgrades: 23-bit absolute encoder for ultra-high resolution (8,388,608 pulses/rev)

Communication Options (with compatible drives):

• EtherCAT – Standard on ProNet Plus series, supports multi-axis synchronization
• CANopen – Available on select drive models
• Modbus RTU (RS485/RS232) – Available on ED3L series
• Pulse train – Position control with line driver or open collector inputs

Software Support

• ESView V3 – Intuitive tuning and configuration software for ProNet Plus series
• Auto-tuning – Standard and real-time auto-tuning for optimized performance
• Vibration suppression – Built-in algorithms to eliminate low-speed抖动

6. Why Choose Estun EM3A-04AFA221?

Industry-Leading Compact Size
The EM3A series represents a breakthrough in motor design, with 20-40% shorter length than competing models in the same power class. This compact form factor enables integration into space-constrained machinery without sacrificing performance.

Exceptional Dynamic Performance
With low inertia design and 6000 RPM maximum speed, the EM3A-04AFA221 delivers rapid acceleration and deceleration for high-throughput applications. The 300% overload capacity ensures reliable operation during demanding duty cycles.

Absolute Encoder Advantage
The 17-bit absolute magnetic encoder eliminates the need for homing routines after power loss, reducing startup time and simplifying machine operation. Position data is retained indefinitely without battery concerns.

Built-in Brake for Vertical Applications
The integrated 24V DC holding brake makes this motor ideal for vertical axis applications where load holding is critical. No external brake mechanism is required, reducing system complexity and cost.

IP65 Protection as Standard
Unlike many competitors that offer IP65 as an option, the EM3A series includes IP65 protection as standard equipment, ensuring reliability in harsh industrial environments without additional cost.

Cost-Effective Alternative
Estun offers performance comparable to Japanese and European brands (Panasonic MINAS, Delta, Yaskawa) at a competitive price point, delivering exceptional value for system integrators and OEMs.

Global Support & Availability
As an active, in-production product, the EM3A-04AFA221 is fully supported by Estun's global technical network. Estun is a publicly traded company (Shenzhen Stock Exchange: 002747) with over 30 years of automation experience.

Key Features at a Glance:

• Low inertia – Optimized for high-dynamic applications
• Holding brake included – Essential for vertical axis applications
• 17-bit absolute encoder – No homing required after power loss
• 6000 RPM max speed – Supports high-speed machining
• IP65 protection – Standard, suitable for harsh environments
• Ultra-compact – 20-40% shorter than competitors
• 300% overload capacity – Handles demanding acceleration requirements
• Oil seal included – Prevents lubricant ingress

7. Model Number Breakdown (For Reference)

The EM3A-04AFA221 model number follows Estun's systematic naming convention:

Encoder Type Codes:

• P: Incremental encoder (2500 P/R typical)
• F: Absolute encoder (17-bit or 23-bit)
• T: Alternative absolute encoder configuration

Brake Codes:

• A: With holding brake (as in EM3A-04AFA221)
• U: Without holding brake

Related Variants: