TAMAGAWA AU6616N1021E2 Servo Drive – AU Series

TAMAGAWA AU6616N1021E2 Servo Drive Amplifier: Closed-Loop Motion Authority in High-Precision Industrial Systems

The TAMAGAWA AU6616N1021E2 is a compact servo drive amplifier manufactured by Tamagawa Seiki Co., Ltd., a Japanese precision motion control specialist with over seven decades of engineering heritage in resolver, encoder, and servo drive technology. Within the AU-series platform, this unit functions as the closed-loop power stage and command interpreter between a host CNC or motion controller and the connected AC servo motor. Its role in the control loop is unambiguous: it receives velocity or torque commands from the upper controller, processes real-time feedback from the motor-mounted resolver or encoder, and applies corrective PWM output to the motor windings at cycle rates that sustain sub-millisecond position error correction.

The AU6616N1021E2 is not a general-purpose inverter. It is a purpose-engineered servo amplifier designed for deterministic closed-loop operation. The distinction matters in practice: where a standard VFD manages speed through open-loop V/Hz control, this unit maintains position and velocity accuracy through continuous feedback comparison, integral gain scheduling, and feed-forward compensation. In CNC machining centers, semiconductor wafer handlers, and precision assembly robots, that difference translates directly into dimensional accuracy, surface finish quality, and throughput consistency.

Tamagawa Seiki’s AU-series drives are natively paired with the company’s own resolver and encoder product families, eliminating the signal conditioning overhead that arises when mixing feedback devices from different manufacturers. The AU6616N1021E2 accepts resolver feedback signals directly, performing resolver-to-digital conversion internally without requiring an external RDC module. This integration reduces wiring complexity, eliminates a potential failure node, and maintains phase accuracy across the full operating speed range — a measurable advantage in applications where encoder interpolation errors accumulate over long duty cycles.

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

Technical Parameters

Electrical parameters (input voltage range, continuous output current, peak current, regenerative braking capacity) are confirmed at inquiry based on application data. We do not publish unverified specifications.

Hardware Logical Analysis

The AU6616N1021E2 implements a three-layer hardware architecture that separates power conversion, signal processing, and feedback conditioning into electrically isolated functional blocks. This partitioning is not incidental — it is a deliberate EMC design strategy that prevents switching noise generated by the IGBT output stage from coupling into the low-level resolver signal paths.

Resolver Interface and Internal RDC: The drive accepts raw resolver excitation and sine/cosine return signals directly from the motor. An onboard resolver-to-digital converter (RDC) samples the resolver output at high frequency and produces a digital position word with angular resolution typically in the range of 12–16 bits per revolution. This eliminates the need for an external RDC module and removes the associated cable runs that would otherwise act as antennas in electrically noisy cabinet environments. The excitation frequency is generated internally, ensuring phase coherence between excitation and demodulation — a requirement for accurate velocity estimation at low speeds where back-EMF methods are unreliable.

EMC and Isolation Architecture: The control board and power board communicate through optocoupler barriers rated for several kilovolts of isolation. Gate drive signals for the IGBT bridge pass through dedicated gate driver ICs with built-in desaturation detection, which shuts down the affected switch within microseconds of a short-circuit event — faster than any software-based protection loop. The resolver signal conditioning circuitry is housed on a separate PCB layer with its own ground plane, physically separated from the DC bus capacitor bank and IGBT module to minimize capacitive coupling of switching transients.

Regenerative Braking Logic: During deceleration, the kinetic energy of the load is returned to the DC bus. The AU6616N1021E2 monitors DC bus voltage continuously; when the bus voltage exceeds the regeneration threshold, the internal braking transistor activates and dissipates excess energy through an external braking resistor. The threshold hysteresis is implemented in hardware to prevent oscillation around the activation point — a common failure mode in drives that rely solely on software comparators for this function.

Gain Scheduling and Feed-Forward: The velocity loop compensator implements proportional-integral control with configurable bandwidth. Feed-forward terms for velocity and acceleration are applied ahead of the feedback loop, reducing the tracking error during dynamic motion profiles without requiring aggressive feedback gains that would excite mechanical resonances. This is particularly relevant in systems with low-stiffness couplings or long ballscrew assemblies where resonant frequencies fall within the servo bandwidth.

System Integration Benefits

• Native Tamagawa Resolver Compatibility: Direct resolver input eliminates external RDC modules, reducing component count, wiring complexity, and potential signal degradation points in the feedback chain.
• Deterministic Velocity Loop Execution: Hardware-timed current and velocity loop execution at fixed interrupt rates ensures consistent closed-loop bandwidth regardless of host controller communication latency.
• Multi-Mode Command Acceptance: Analog velocity/torque command and pulse-train position command modes allow integration with a wide range of CNC controllers, motion cards, and PLCs without signal conversion hardware.
• Onboard Fault Diagnostics: Fault codes are latched and readable via front-panel indicators and serial diagnostic port, enabling maintenance personnel to identify fault category (overcurrent, feedback loss, thermal, regeneration) without oscilloscope access.
• Compact Panel Footprint: The drive’s form factor allows installation in existing control cabinets without structural modification, reducing retrofit engineering time and cabinet re-certification scope.
• Electrical Isolation Between Control and Power Stages: Optocoupler isolation on all control signal paths prevents ground loop currents from corrupting command signals — a common source of velocity ripple in poorly isolated drive installations.
• Hardware-Level Overcurrent Protection: Desaturation detection in the gate driver layer responds to shoot-through events in under 2 µs, protecting the IGBT module and motor windings independently of firmware execution state.
• Drop-In AU-Series Replacement: Mechanical and electrical interface compatibility within the AU-series family minimizes re-commissioning effort — parameter sets from the replaced unit can typically be transferred directly, reducing machine downtime from days to hours.

Quality Assurance & Global Logistics

Every AU6616N1021E2 unit offered through siemensplc.com is sourced through verified supply channels and subjected to a structured pre-shipment inspection process. Units are examined for PCB surface condition, connector pin integrity, housing damage, and label authenticity against OEM reference documentation. Where functional testing is applicable, drives are bench-verified under controlled load conditions to confirm control response and feedback signal integrity prior to dispatch.

Shipments originate from our warehouse in Xiamen, China — a major logistics hub with direct access to international express carriers including DHL, FedEx, and UPS, as well as consolidated sea freight services for multi-unit orders. Transit times to major industrial regions are typically 3–7 business days by air express. All shipments include full commercial documentation: commercial invoice, packing list, and inspection report. OEM datasheets and test records are included where available to support incoming inspection and traceability requirements.

A 12-month warranty covers all units against defects in materials and workmanship from the date of shipment. Warranty claims are handled directly by our engineering team — not routed through a third-party service center — ensuring technically accurate assessment and fast resolution. Units confirmed defective under warranty are replaced or credited without requiring the customer to navigate a multi-tier RMA process.

For B2B procurement teams requiring documentation packages for incoming inspection, customs clearance, or internal audit purposes, we provide complete traceability records upon request. Export compliance documentation is prepared in accordance with applicable trade regulations for the destination country.

Contact Information

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