ELAU SM-070/60/020/P1/45/S1/B0 Servo Motor – MaxDrive Series

ELAU SM-070/60/020/P1/45/S1/B0: A 70 mm Permanent-Magnet Servo Motor Engineered for Deterministic Multi-Axis Motion in PacDrive Architectures

The SM-070/60/020/P1/45/S1/B0 is a permanent-magnet synchronous servo motor (PMSM) from ELAU’s MaxDrive SM-070 frame class, designed as a native actuator within the PacDrive closed-loop motion system. The part number encodes the complete mechanical and electrical specification: 70 mm IEC square flange (SM-070), 60 mm active stack length (/60), 2.0 Nm rated continuous torque (/020, expressed as torque × 10), single-turn resolver feedback (/P1), 45 mm smooth cylindrical shaft (/45), S1 continuous duty per IEC 60034-1 (/S1), and no integrated holding brake (/B0). This deterministic naming convention allows procurement engineers and machine builders to verify drive compatibility and mechanical fit directly from the part number without consulting secondary documentation.

Within the PacDrive motion architecture, the SM-070/60/020/P1/45/S1/B0 operates as a tightly coupled axis node on a SERCOS II fiber-optic ring. The SERCOS II protocol delivers isochronous real-time communication with configurable cycle times down to 250 µs and ring-level jitter below 1 µs, which is the prerequisite for electronic camming, gearbox emulation, and registration mark synchronization across multi-axis packaging and converting lines. The motor does not function as a standalone drive; it is parameterized and commissioned exclusively through the ELAU PacDrive MC-4 or MC-6 motion controller, which manages field-oriented current control (FOC), thermal modeling, and axis coordination from a single engineering environment.

The 2.0 Nm continuous torque rating, combined with a peak torque capability of approximately 6.0 Nm (3× rated, amplifier-limited), positions this motor for applications requiring rapid acceleration of low-to-medium inertia loads followed by sustained constant-velocity operation — a duty profile characteristic of intermittent-motion indexing tables, rotary knife drives, and servo-controlled cam followers in secondary packaging equipment.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

Stator Winding Architecture: The SM-070 stator uses a distributed lap winding produced by automated needle-winding equipment, achieving a slot-fill ratio that reduces DC resistance per phase and lowers copper losses at rated current. The winding pitch is selected to minimize the 5th and 7th harmonic components of the back-EMF waveform, producing a near-sinusoidal voltage profile. When the PacDrive amplifier’s FOC algorithm applies sinusoidal current references to this winding, the resulting torque ripple remains below 2% of rated torque across the operating speed range — a figure that is directly measurable in web-tension and label-registration applications where velocity non-uniformity translates to product defects.

Rotor Flux Density and Inertia Management: Surface-mounted NdFeB magnets are bonded to a laminated silicon-steel rotor core and retained under a pre-tensioned carbon-fiber sleeve. The sleeve constrains magnet movement at speeds up to the motor’s maximum mechanical limit while adding negligible mass to the rotor assembly. The resulting rotor inertia is low relative to the torque output, producing a torque-to-inertia ratio that shortens the settling time of point-to-point moves. In practice, this means the load-to-motor inertia mismatch ratio remains within the PacDrive amplifier’s stable control bandwidth for a wider range of tooling configurations, reducing the need for mechanical inertia matching devices such as gearboxes or flywheels.

Resolver Feedback and RDC Signal Chain: The P1 resolver is a 2-pole, brushless transformer wound onto the rear shaft extension. It operates on an excitation signal supplied by the PacDrive drive module and returns two amplitude-modulated sinusoidal signals (sin θ, cos θ) proportional to rotor angular position. The drive’s resolver-to-digital converter (RDC) applies a tracking loop algorithm to interpolate these signals to 16-bit angular resolution (65,536 counts per revolution). Because the resolver contains no active electronics, battery, or optical components, it is immune to the failure modes that affect absolute encoders with capacitor-backed SRAM or LED emitters. After an unplanned power interruption, the drive reconstructs absolute position from the resolver signals within one electrical cycle of the excitation frequency, eliminating the need for a homing sequence before resuming production.

Thermal Conduction Path and Predictive Derating: The stator lamination stack is pressed into the aluminum housing bore with a controlled interference fit, minimizing the thermal contact resistance between the winding heat source and the housing outer surface. The PacDrive MC controller continuously executes an I²t thermal model using the motor’s winding thermal time constant and the measured phase current, generating a real-time winding temperature estimate. When this estimate approaches the Class F insulation limit, the controller issues a warning and initiates a torque derating ramp before a fault trip occurs. This predictive behavior prevents abrupt machine stops on high-throughput lines and provides the operator with a defined response window.

EMC Shielding at the Connector Interface: The M23 circular connector shell provides 360° circumferential shielding termination for both the power cable and the resolver feedback cable. The feedback cable shield is grounded at both the motor connector and the drive cabinet entry point through low-impedance clamps, forming a continuous Faraday enclosure around the low-level resolver signal conductors. This dual-end grounding strategy, combined with the common-mode choke integrated into the PacDrive amplifier’s motor output stage, suppresses conducted emissions on the motor cable to levels compliant with EN 61800-3 Category C2 in most standard installation geometries without requiring additional external EMC filters.

System Integration Benefits

• Isochronous SERCOS II axis coordination at 250 µs cycle time: The motor participates in a deterministic ring topology where all axes receive their position setpoints simultaneously within a jitter window below 1 µs, enabling electronic camming profiles that replace mechanical gearboxes and eliminate changeover time associated with physical cam replacement.
• Battery-free absolute position retention across power cycles: The resolver-based feedback reconstructs single-turn absolute position immediately after power restoration, removing homing routines from the restart sequence and recovering several minutes of production time per unplanned stop event.
• Predictive thermal fault prevention via I²t modeling: The PacDrive controller’s continuous winding temperature estimate triggers a graduated derating ramp before a thermal fault trip, giving operators a defined intervention window and preventing abrupt line stops on high-throughput packaging equipment.
• Real-time axis diagnostics via SERCOS parameter channel: Actual torque, velocity, position error, and thermal load index are accessible through SERCOS IDN parameters (S-0-0040 family) at every control cycle, enabling direct integration into SCADA systems and OEE dashboards without additional hardware or protocol converters.
• Sub-2% torque ripple for tension-critical web processes: The sinusoidal back-EMF profile and FOC current control maintain web and film tension within ±0.5% of setpoint in winding and unwinding applications, reducing material waste attributable to tension-induced registration errors.
• 3:1 peak-to-continuous torque ratio for intermittent duty profiles: The ~6.0 Nm peak torque capability allows rapid acceleration of moderate-inertia loads during indexing moves while the 2.0 Nm continuous rating keeps the motor within its thermal envelope during dwell phases, avoiding frame oversizing.
• Mechanical interchangeability within the SM-070 torque family: All SM-070 variants share the 70 mm IEC flange pattern and M23 connector pinout, so upgrading to a higher torque class (e.g., /040 or /060) requires no modification to the machine frame, cable harness, or connector wiring — only drive parameter updates.
• IP65 housing for washdown-adjacent installation: The sealed die-cast aluminum housing withstands directed water jets per IEC 60529 IP65, making the motor suitable for food-grade and pharmaceutical packaging lines where periodic pressurized cleaning is part of the sanitation protocol.
• High power density reduces machine cross-section: The NdFeB rotor delivers 2.0 Nm continuous from a 70 mm frame, a cross-sectional area 30–40% smaller than equivalent induction motor solutions, directly reducing machine width and structural material cost in multi-axis gantry and rotary configurations.
• Single engineering environment for commissioning and diagnostics: Motor parameterization, axis tuning, cam profile definition, and fault diagnostics are all performed within the ELAU PacDrive Workbench software, eliminating the need for separate drive configuration tools and reducing commissioning time on multi-axis machines.

Quality Assurance & Global Logistics

Each SM-070/60/020/P1/45/S1/B0 unit dispatched from our Xiamen, China facility passes a structured incoming inspection protocol covering label and serial number authenticity verification, M23 connector pin integrity and shell continuity, shaft runout measurement against the manufacturer’s tolerance band, and insulation resistance testing at 500 V DC (acceptance threshold: ≥100 MΩ). Units that fail any acceptance criterion are quarantined and removed from available inventory. Serial numbers are logged against procurement records in our warehouse management system, creating a documented chain of custody that satisfies the traceability requirements of ISO 9001:2015 and customer-specific supplier qualification audits.

Outbound shipments from Xiamen utilize direct access to Xiamen Gaoqi International Airport and Xiamen Port — two established export nodes for industrial components. Express shipments are dispatched via DHL Express or FedEx International Priority, with typical transit times of 3–5 business days to European destinations, 2–4 days to Southeast Asia, and 4–6 days to North America. For volume orders, sea freight via Xiamen Port is available with complete export documentation: commercial invoice, packing list, certificate of origin, and HS Code 8501.52 classification. DDP and DAP Incoterms are supported for B2B accounts requiring landed-cost certainty and simplified customs clearance.

Units are packed in anti-static foam-lined cartons with desiccant sachets to prevent moisture ingress during transit. The 12-month warranty covers manufacturing defects and DOA conditions verified by return inspection. Warranty claims are processed within 5 business days of receipt of the returned unit at our Xiamen facility, with replacement dispatch or credit note issued upon completion of the inspection report.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.