Introduction to ELAU SR-058/60/005/P0/21/S1/B0/T
Product Description
The ELAU SR-058/60/005/P0/21/S1/B0/T is a compact, high-torque synchronous servo motor designed for precision motion control in small to medium industrial automation applications. As a key component of Schneider Electric’s ELAU portfolio (now integrated into the Lexium Motion range), this motor is engineered to work seamlessly with ELAU servo drives (such as the C200 and mid-range C-series variants) to deliver exceptional dynamic response, low inertia, and reliable performance—making it ideal for industries including packaging (small labelers), textile machinery (thread tension control), medical equipment (precision pumps), and light-duty robotic arms.
The model designation “SR-058/60/005/P0/21/S1/B0/T” encodes its core specifications: “SR” denotes a “Standard Rotor” synchronous design, “058” indicates a 58mm frame size (compact for space-constrained setups), “60” specifies a maximum speed of 6000 RPM, “005” references a 0.5 Nm continuous torque rating, “21” denotes a 21-bit absolute encoder for high-precision feedback, and “T” signifies a special thermal optimization for extended duty cycles. Unlike larger servo motors, the SR-058 series prioritizes compactness and low weight without compromising torque density—critical for applications where mechanical space is limited (e.g., desktop automation or small conveyor systems). Its robust construction includes a stainless steel shaft, class F insulation, and a sealed design, enabling operation in dusty or slightly humid industrial environments.
Technical Parameters
- Frame Size: 58mm (flange diameter, ISO 9409-1 compliant)
- Torque Ratings:
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- Continuous torque: 0.5 Nm
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- Peak torque (10s duration): 1.5 Nm
- Speed Ratings:
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- Maximum speed: 6000 RPM
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- Rated speed: 3000 RPM (at continuous torque)
- Electrical Specifications:
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- Rated voltage: 200V AC (compatible with ELAU C200 drives)
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- Rated current: 3.2A (continuous); 9.6A (peak)
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- Power rating: 0.16 kW (continuous, at rated speed)
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- Stator resistance (phase-to-phase): 2.8 Ω
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- Stator inductance (phase-to-phase): 8.5 mH
- Feedback Device: 21-bit absolute encoder (BiSS-C protocol, 5V, up to 1 Mbps) with multi-turn position memory (no battery required)
- Mechanical Specifications:
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- Shaft diameter: 8mm (with 2mm keyway)
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- Moment of inertia: 0.00025 kg·m² (low for fast acceleration)
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- Weight: 1.4 kg
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- Mounting: Flange mount (4-bolt, M4 threads, 40mm bolt circle)
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- Shaft seal: Nitrile rubber (IP65-rated for dust/water spray)
- Environmental Ratings:
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- Insulation class: F (maximum surface temperature: 155°C)
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- Protection rating: IP65 (motor body and shaft); IP54 (connector)
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- Operating temperature: -20°C to +40°C (ambient); +100°C (max surface temp)
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- Storage temperature: -40°C to +80°C
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- Vibration resistance: 10–500 Hz, 8g peak (IEC 60068-2-6)
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- Shock resistance: 25g peak (11ms duration, IEC 60068-2-27)
- Certifications: CE, UL 1004-1, IEC 60034-1, RoHS, ISO 13485 (medical equipment compatible)
Usage Methods
- Installation:
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- Mounting Preparation: Ensure the mounting surface is flat (≤0.1mm/100mm) and clean to avoid motor housing distortion. Use M4 bolts (torque: 4 Nm) to secure the flange to the machine frame—over-tightening may damage the housing or misalign the shaft.
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- Shaft Alignment: Use a flexible coupling (preferably zero-backlash) to connect the motor shaft to the load. Limit misalignment to ≤0.05mm radial and ≤0.1mm axial to prevent premature bearing wear. Avoid direct rigid coupling, as it transfers load vibrations to the motor.
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- Environmental Considerations: Install the motor away from direct heat sources (e.g., heaters, power resistors) and ensure minimum airflow clearance of 20mm around the motor body for heat dissipation (critical for the “T” thermal optimization to work effectively).
- Wiring and Connection:
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- Power Wiring: Connect the motor’s U, V, W windings to the servo drive using twisted-pair, shielded cable (min. 0.5mm² cross-section). Match the phase sequence to the drive’s output terminals—reversing two phases will invert motor rotation (correct via drive software if needed).
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- Feedback Wiring: Connect the 21-bit absolute encoder to the drive’s feedback port using the manufacturer-supplied shielded cable (4-wire for power, 4-wire for BiSS-C signal). Ground the cable shield at both the motor and drive ends to minimize electromagnetic interference (EMI) from nearby power cables.
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- Grounding: Securely ground the motor frame to the machine chassis using a dedicated ground screw (M3) on the flange—this prevents electrical noise and ensures safety in case of insulation failure.
- Commissioning and Calibration:
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- Drive Pairing: Pair the motor with a compatible ELAU servo drive (e.g., C200/05/1/1/1/00) and use Schneider Electric’s SoMove software to load the motor’s pre-defined parameter set (available in the software’s motor database).
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- Auto-Tuning: Run the drive’s “Motor Identification” function to auto-calibrate current loops, torque limits, and encoder offset—this optimizes the drive-motor pair for the connected load, reducing settling time and overshoot.
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- Direction and Speed Test: Jog the motor at low speed (500 RPM) to verify rotation direction and encoder feedback accuracy. Use the drive’s software to adjust direction (if reversed) and set speed limits to match application requirements (never exceed 6000 RPM).
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- Torque Verification: Apply a rated load (0.5 Nm) and monitor motor temperature via the drive’s diagnostic tool—surface temperature should not exceed 100°C. If overheating occurs, reduce duty cycle or check for misalignment.
- Operation and Maintenance:
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- Real-Time Monitoring: Track key parameters via the drive or HMI: motor current (should stay ≤3.2A during continuous operation), temperature, and encoder position. Set alarms for abnormal values (e.g., current >4A or temp >90°C) to prevent damage.
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- Routine Inspections: Perform monthly checks:
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- Inspect the shaft seal for oil leakage or debris buildup (clean with a dry cloth if needed).
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- Verify coupling tightness to avoid slippage or misalignment.
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- Check connector pins for corrosion (treat with anti-corrosion spray if operating in humid environments).
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- Lubrication: The motor’s deep-groove bearings are pre-lubricated for 10,000 operating hours—no additional lubrication is required. Replace bearings if unusual noise (e.g., grinding) is detected.
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- Long-Term Storage: If stored for >6 months, rotate the shaft 180° monthly to prevent bearing brinelling. Store in a dry environment (RH <60%) at -20°C to +40°C.
System Introduction
The ELAU SR-058/60/005/P0/21/S1/B0/T functions as the mechanical “muscle” in precision motion control systems, working in tandem with a servo drive and motion controller to convert electrical energy into precise rotational motion. Its integration into the system relies on four key interactions:
- Power Conversion: The servo drive (e.g., ELAU C200) converts AC input power to variable-frequency, variable-voltage AC to energize the motor’s stator windings. This creates a rotating magnetic field that interacts with the permanent magnet rotor, generating torque and rotation.
- Feedback Loop: The 21-bit absolute encoder continuously sends position and velocity data to the drive. The drive uses this feedback to adjust stator current in real time (closed-loop control), ensuring the motor follows the controller’s setpoints with ±0.001° positioning accuracy.
- Torque/Speed Regulation: The motion controller (e.g., ELAU MC-4 series) sends torque or speed commands to the drive. The drive modulates power to the motor to maintain the desired output—critical for applications like medical pump control, where consistent torque prevents fluid pressure fluctuations.
- Mechanical Load Transfer: The motor’s low-inertia rotor enables fast acceleration/deceleration (up to 5000 rad/s²), making it suitable for dynamic applications like small robotic pick-and-place. The flexible coupling isolates the motor from load vibrations, preserving bearing life and encoder accuracy.
In a small pharmaceutical filling machine example, the SR-058 motor drives a precision screw conveyor that dispenses powdered medication. The ELAU MC-4 controller sends position commands to the C200 drive, which adjusts the motor’s speed to maintain a consistent fill rate (100mg per capsule). The 21-bit encoder ensures the conveyor stops within ±0.1mm of the target position, preventing overfilling. The motor’s thermal optimization allows it to run continuously for 8-hour shifts without overheating, while its IP65 rating protects against dust from the powdered medication.
Related Models in the Series
- ELAU SR-058/60/010/P0/21/S1/B0/T: 0.5 Nm → 1.0 Nm continuous torque variant, ideal for slightly heavier loads (e.g., small conveyor belts or label applicators).
- ELAU SR-058/40/005/P0/21/S1/B0/T: 6000 RPM → 4000 RPM maximum speed model, optimized for applications requiring lower speed but higher torque density (e.g., textile thread tensioners).
- ELAU SR-058/60/005/A0/21/S1/B0/T: Replaces the absolute encoder with a 1024-line incremental encoder, suitable for cost-sensitive applications where position memory after power loss is not required (e.g., basic packaging feeders).
- ELAU SR-063/60/008/P0/21/S1/B0/T: 58mm → 63mm frame size, 0.8 Nm torque, for larger small-scale applications (e.g., light-duty robotic arms or precision cutting tools).
- ELAU SR-058/60/005/P0/21/S1/B1/T: IP65 → IP67 protection rating, with enhanced shaft sealing for washdown environments (e.g., food processing or pharmaceutical cleaning stations).
- ELAU SR-058/60/005/P0/17/S1/B0/T: 21-bit → 17-bit absolute encoder, balancing precision and cost for applications like office automation (e.g., high-speed document feeders) or laboratory equipment.
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