Motion Control Solutions for Semiconductor & Precision Electronics

Micron-Level (Stepper) to Sub-Micron-Level (Servo) Precision Motion Control — Low-Interference, Stable Solutions for High-End Semiconductor Processes

Semiconductor & Precision Electronics

Industry technical challenges

Insufficient micro-travel positioning accuracy, process errors exceed tolerances

Wafer handling, chip alignment, precision packaging, and microscopic inspection involve extremely short travel distances with stringent accuracy requirements. Conventional drives with low step accuracy and poor repeatability cause even minor deviations to result in packaging defects, inspection errors, and alignment failure. High-end semiconductor processes generally demand sub-micron positioning standards.

Micro-vibration interference affecting precision processes

Semiconductor precision processes are extremely vibration-sensitive — even minor vibration causes wafer shifting, image blurring, and alignment deviation. Low vibration is one contributor to high precision, but overall accuracy is determined by encoder resolution, transmission mechanics, and control system architecture collectively — not by vibration reduction alone. Conventional drives with excessive vibration and noise cannot meet the requirements of ultra-high-precision cleanroom processes.

Excessive electromagnetic interference affecting chip inspection and sensing equipment

Semiconductor inspection and precision sensing equipment are highly susceptible to EMI. Conventional drives with excessive electromagnetic radiation and signal interference cause data fluctuation and abnormal signals, compromising process stability and yield.

Long-term low-frequency precision operation leading to repeatability degradation

Semiconductor equipment typically involves extended low-frequency fine-tuning and precision reciprocating motion. Conventional drives tend to develop precision drift and reduced motion consistency over time, failing to ensure standardized and consistent batch processing.

Working Condition

Stepper Motor System Applications

Suited for micro‑stroke low‑frequency trimming, intermittent reciprocation, and auxiliary precision positioning in semiconductor & precision electronics, including:
Micro open‑loop stepper: For basic micron‑level precision adjustment with ultra‑high micro‑stepping, quiet and low‑vibration operation.
Precision closed‑loop stepper: For mid‑range micron‑level precision inspection equipment, eliminating minor accuracy drift.
Critical limitation: Stepper accuracy is limited to about ±2–5 μm and cannot meet sub‑micron (±0.1–1 μm) high‑end wafer processing requirements.

Servo Motor System Applications

Suited for high‑end compliant trajectory, ultra‑low interference, sub‑micron ultra‑high repeatability, and multi‑axis precision coordination in semiconductor & precision electronics, including:
Low‑voltage servo (24V/48V): For wafer transfer, chip packaging, precision inspection alignment, with low vibration, low EMI, and smooth start‑stop as core features.
Technical features: Combined with high‑resolution encoders (≥17‑bit) and precision mechanical transmission (ballscrews, linear motors) to achieve sub‑micron positioning (±0.1–1 μm); optimised torque ripple and EMC design ensure stable, interference‑free data acquisition.

Tiered Technical Solutions

Industry characteristics & selection logic:

Semiconductor precision electronics demand sub‑micron accuracy (±0.1–1 μm), ultra‑low vibration (<0.01 m/s²), ultra‑low EMI (Class A), and cleanliness (ISO Class 4–6). Core processes must avoid vibration, thermal drift, and EMI. Micro steppers suit auxiliary trimming (±5–10 μm); low‑voltage servos are the mainstream core drive (accuracy ±0.1–1 μm). All series require low noise (≤40 dB) and low particle emission.

Solution 1: Micro precision open‑loop stepper – Basic micron‑level precision trimming

• Matched products 20J1840‑404 (0.027 N·m) or 28J1851‑407 (0.1 N·m) + 2DM415 (0.21–1.50 A, DC 18–36 V) • Applicable equipment Precision electronic trimming fixtures, small inspection stages (coarse adjustment for optical microscopes), auxiliary alignment equipment, light precision sorting devices • Technical features Ultra‑high micro‑stepping (256), micro‑stroke adjustment uniform and precise (step angle 0.007°); Extremely low vibration and noise (<40 dB, vibration <0.05 m/s²); Compact for integration into precision equipment, stable under long‑term low‑frequency trimming; Accuracy level ±5–10 μm – meets basic micron‑level auxiliary applications, not sub‑micron high‑end standards; Cleanliness ISO Class 6–7 (low‑particle design). • Selection boundary Only for auxiliary trimming and coarse alignment; core wafer processes (sub‑micron) must use Solution 4 (low‑voltage servo).

Solution 2: Precision closed‑loop stepper – Mid‑range micron‑level precision process upgrade

• Matched products 42J1848EC‑1000‑LS (0.5 N·m) or 57J1854EC‑1000‑LS (1.0 N·m, 1000 P/R) + 2HSS42 (0–2 A, DC 24–48 V) or 2HSS57 (0–5 A, DC 24–60 V) • Applicable equipment Mid‑range precision inspection equipment (AOI platforms, non‑critical imaging axes), high‑precision trimming stages, standard precision electronics assembly equipment • Technical features 1000‑line encoder real‑time closed‑loop error correction eliminates long‑term drift, repeatability ±2–5 μm; Smooth operation, low vibration and noise (<0.02 m/s², <42 dB); Dynamic response and micro‑path control lower than low‑voltage servo; not for sub‑micron core wafer processes; ISO Class 6 cleanliness. • Selection boundary Suitable for mid‑range inspection and assembly auxiliary; core wafer transfer and packaging must use Solution 4 (low‑voltage servo).

Solution 3: Low‑interference precision closed‑loop stepper – EMI‑optimised mid‑range equipment

• Matched products 57J1854EC‑1000‑LS (1.0 N·m) + 2HSS57‑CN (low‑EMI closed‑loop drive with built‑in common‑mode choke) • Applicable equipment Precision electronic inspection equipment (non‑ultra‑sensitive sensors), trimming mechanisms in EMI‑sensitive environments • Technical features Enhanced EMC design over standard closed‑loop (common‑mode choke + shielded terminals), reducing radiated interference (conducted emissions meet CISPR 11 Class B); Accuracy ±2–5 μm; EMI better than standard closed‑loop but still below low‑voltage servo dedicated solutions; Suited for mid‑range equipment with EMI requirements but not sub‑micron accuracy. • Selection boundary Suitable for auxiliary trimming in EMI‑sensitive environments; for core axes of high‑sensitivity sensing equipment (e.g., electron microscopes), use Solution 4 (low‑voltage servo).

Solution 4: High‑end sub‑micron low‑voltage servo – Core wafer processes

• Matched products 60ASM400‑5‑17BCH (48 V, 400 W, rated 1.27 N·m, peak 2.54 N·m, 17‑bit encoder) + MCAC610‑23B‑EC (EtherCAT low‑voltage drive, 10 A, built‑in EMC filter) • Applicable equipment Wafer transfer equipment (X‑Y‑θ axes), fully automatic chip packaging (bonding/placement heads), high‑end multi‑axis precision inspection and alignment equipment • Technical features Optimised torque ripple (<1% rated), system vibration reduced to <0.005 m/s²; Built‑in EMC filter (meets EMI Class A) with shielded wiring greatly reduces EMI; Combined with 17‑bit encoder and precision transmission (ballscrew C3 or higher) for sub‑micron positioning (±0.1–1 μm); Minimal accuracy decay over long operation (<0.3 μm/24 h), noise <40 dB; Fully meets stringent requirements of high‑end semiconductor clean precision processes (ISO Class 4–5). • Selection boundary Core axes for wafer transfer, chip packaging, and precision inspection must use this solution; auxiliary trimming may use Solution 1 or 2.

Solution 5: Bus integrated low‑voltage servo – Ultimate compact sub‑micron control

• Matched products IESV60‑30‑40‑48‑17BC‑EC (48 V, 400 W, rated 1.27 N·m, 17‑bit encoder, EtherCAT) • Applicable equipment Wafer transfer arm end axes, precision alignment stage drives, compact packaging equipment positioning axes (mounting length ≤70 mm) • Technical features Fully integrated drive, control, communication; minimised volume (axial length ~35 mm shorter than discrete); EtherCAT distributed control, sync <1 μs; 17‑bit absolute encoder guarantees sub‑micron accuracy (±0.1–1 μm); Noise <40 dB, vibration <0.006 m/s², ISO Class 5 cleanliness. • Selection boundary For extremely space‑constrained core precision axes requiring bus control; for higher torque (>1.5 N·m), upgrade to Solution 4 (discrete low‑voltage servo).

Solution 6: Ultra‑low inertia non‑backpack integrated servo – High‑speed light‑load precision scanning

• Matched products IESV57‑30‑14‑36‑17BC (36 V, 140 W, rated 0.45 N·m, 17‑bit) or IESV60‑30‑20‑36‑17BC (36 V, 200 W, rated 0.64 N·m) • Applicable equipment High‑speed light‑load wafer transfer axes (load ≤1 kg), precision alignment mechanisms, high‑speed inspection scanning axes • Technical features Non‑backpack design, shortest motor length (≤60 mm) for extremely tight spaces; Ultra‑low rotor inertia (0.3×10⁻⁴ kg·m²), accel/decel <10 ms; 17‑bit encoder for sub‑micron positioning (±0.1–1 μm); Noise <38 dB, vibration <0.005 m/s². • Selection boundary High‑speed light loads (≤1 kg) with strict length constraints; for loads >2 kg or higher torque, upgrade to Solution 4.

Technical Advantages

Full precision coverage

Micro stepper (±5–10 μm), closed‑loop stepper (±2–5 μm), low‑voltage servo (±0.1–1 μm) – balancing basic equipment cost and high‑end semiconductor standards.

Tiered precision micro‑control

Ultra‑high micro‑stepping + closed‑loop error correction ensure micron‑level stability; low‑voltage servo with high‑precision transmission delivers sub‑micron control, eliminating alignment and inspection errors.

Low vibration, low noise, low interference

All series optimised for vibration, noise, and EMI (stepper <45 dB, servo <0.005 m/s², EMI Class A); low‑voltage servo performs best for clean precision semiconductor environments.

Ultra‑high repeatability and stability

Closed‑loop design prevents drift in long‑term low‑frequency operation; servo offers even better long‑term stability, ensuring batch process consistency and equipment reliability.

Industry Application Cases

Basic precision trimming – Micro stepper for precision auxiliary fixtures

For basic micron‑level trimming, micro steppers with ultra‑high micro‑stepping provide uniform step motion, quiet, low‑vibration operation for inspection stage translation and auxiliary alignment.

Mid‑range process upgrade – Closed‑loop stepper for precision inspection equipment

Addresses long‑term micro‑drift in micron‑level inspection with real‑time compensation and high repeatability, improving alignment accuracy; not for sub‑micron core wafer processes.

Low‑interference precision – EMI‑optimised closed‑loop stepper for sensitive environments

Low‑EMI closed‑loop stepper reduces radiated interference in EMI‑sensitive inspection environments, meeting mid‑range accuracy requirements.

High‑end wafer processing – Low‑voltage servo for wafer transfer equipment

For sub‑micron wafer processes, low‑voltage servos deliver smooth start‑stop, ultra‑low vibration, and low EMI, precisely positioning wafers to meet ultra‑high precision requirements.

Multi‑axis precision coordination – Bus servo for high‑end packaging equipment

For multi‑axis chip packaging, bus servo multi‑axis coordination ensures smooth trajectories and precise motion with strong process stability and high consistency.