AMETEK MAE HY Series Hybrid Stepper Motors — HY2004270900A8

Technical Dossier

Product Details And Specifications

AMETEK MAE HY Series Hybrid Stepper Motors: Comprehensive Module Range and Technical Overview

The AMETEK MAE HY Series represents one of the most widely deployed families of hybrid stepper motors in global heavy industry. Manufactured by AMETEK Precision Motion Control (formerly MAE — Motori Asincroni Elettronici, Italy), these motors are installed across chemical processing plants, nuclear facility auxiliary systems, oil refineries, semiconductor fabrication lines, and precision CNC machinery. The HY Series is characterized by its two-phase hybrid stepper architecture, combining the rotor construction of a permanent magnet motor with the stator geometry of a variable reluctance motor. This design delivers high torque density, repeatable step accuracy (typically 1.8° full step / 0.9° half step), and low resonance — properties that made the series a standard specification in European and North American industrial automation from the 1980s onward. The series spans frame sizes from NEMA 17 through NEMA 34 (42 mm to 86 mm), with holding torques ranging from 0.2 N·m to over 9 N·m depending on stack length and winding configuration.

The Evolution of HY Series Architecture

The MAE HY Series was introduced in the late 1970s as part of a broader European initiative to standardize stepper motor form factors for industrial servo and positioning applications. Early variants used single-stack configurations with bipolar winding schemes and were designed for direct coupling to lead screw assemblies in machine tools. By the mid-1980s, MAE expanded the series to include multi-stack (double and triple stack) configurations, significantly increasing available torque without increasing the motor's footprint diameter.

The acquisition of MAE by AMETEK Inc. in the early 2000s brought standardization of connector interfaces and the introduction of IP54-rated enclosure variants for use in wash-down and dusty environments. Later revisions introduced optional encoder mounts (rear-shaft extensions) and integrated damper flanges to suppress mid-range resonance — a known limitation of open-loop stepper systems operating above 500 RPM.

Compatibility note: HY Series motors use industry-standard NEMA mounting patterns and are electrically compatible with most two-phase bipolar stepper drivers (chopper-type, 24–80 VDC bus). However, winding impedance varies significantly between stack lengths and part numbers. Substituting one HY variant for another without verifying phase resistance and inductance will result in driver detuning or thermal overload. Always cross-reference the full part number before replacement.

The series is now in a mature/end-of-life phase. AMETEK has transitioned new designs to the MDrive and similar integrated motion platforms. However, installed base volume in legacy machinery ensures continued demand for HY Series spare parts through at least 2035.

HY Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the AMETEK MAE HY Series. Models are organized by frame size and stack configuration.

NEMA 17 / 42 mm Frame

• HY200-0674: NEMA 17 single-stack, 1.8° step, 0.22 N·m holding torque, bipolar winding
• HY200-0674-A: NEMA 17 single-stack with rear shaft extension for encoder mount
• HY200-1334: NEMA 17 double-stack, 1.8° step, 0.44 N·m holding torque, bipolar 4-lead

NEMA 23 / 57 mm Frame

• HY200-2234: NEMA 23 single-stack, 1.8° step, 0.9 N·m holding torque, 4-lead bipolar
• HY200-2234-A: NEMA 23 single-stack with IP54 sealed housing
• HY200-3334: NEMA 23 double-stack, 1.8° step, 1.8 N·m holding torque, 8-lead universal winding
• HY200-4434: NEMA 23 triple-stack, 1.8° step, 2.7 N·m holding torque, high-current bipolar
• HY2004270900A8: NEMA 23 frame, 1.8° step angle, 2-phase hybrid, 4-lead bipolar winding, 0.9 A/phase rated current, 57 mm body, standard industrial duty — the subject of this listing
• HY200-3334-8: NEMA 23 double-stack, 8-lead configuration for series/parallel wiring flexibility

NEMA 34 / 86 mm Frame

• HY200-5534: NEMA 34 single-stack, 1.8° step, 3.5 N·m holding torque, 4-lead bipolar
• HY200-6634: NEMA 34 double-stack, 1.8° step, 6.0 N·m holding torque, 8-lead universal
• HY200-7734: NEMA 34 triple-stack, 1.8° step, 9.0 N·m holding torque, high-torque industrial
• HY200-6634-A: NEMA 34 double-stack with integrated rear damper flange
• HY200-5534-IP65: NEMA 34 single-stack, IP65 sealed, wash-down rated variant
• HY200-7734-E: NEMA 34 triple-stack with rear encoder mounting plate and extended shaft

Sourcing Hard-to-Find & Obsolete HY Series Parts

DriveKNMS maintains a dedicated inventory program for AMETEK MAE HY Series motors, including models that have been discontinued from the manufacturer's active catalog. As the HY Series has entered its end-of-life phase, OEM lead times for replacement units have extended to 16–26 weeks or become indefinite. DriveKNMS addresses this through three sourcing channels:

• New-old-stock (NOS) inventory: Factory-sealed units sourced from authorized distributor closeouts and OEM surplus programs, stored in climate-controlled warehousing.
• Reconditioned units: Fully disassembled, inspected, rewound (where applicable), and reassembled motors with new bearings and seals, tested to original torque and step accuracy specifications.
• Cross-reference substitution: For models where no direct replacement exists, DriveKNMS engineers provide a verified substitute recommendation with documented electrical and mechanical compatibility data.

All sourced units are shipped with a certificate of conformance and a 12-month warranty against defects in materials and workmanship. Emergency same-day dispatch is available for in-stock items.

Quality Control for the HY Series Range

AMETEK MAE HY Series motors present specific test challenges due to their hybrid rotor construction and the sensitivity of their winding impedance to temperature and mechanical condition. DriveKNMS applies the following test protocol to every HY Series unit processed:

• Phase resistance measurement: Both phases measured at 25°C ambient using a 4-wire Kelvin bridge. Tolerance: ±5% of nameplate specification.
• Phase inductance measurement: Measured at 1 kHz using an LCR meter. Inductance imbalance between phases must not exceed 3%.
• Insulation resistance test: 500 VDC megohmmeter applied between each phase and motor frame. Minimum acceptable: 100 MΩ.
• No-load step accuracy test: Motor driven through 200 full steps (one mechanical revolution) on a calibrated rotary encoder. Maximum cumulative error: ±3 arc-minutes.
• Holding torque verification: Static torque measured at rated current using a calibrated torque arm. Must meet ≥95% of nameplate holding torque.
• Bearing noise and runout check: Shaft runout measured with a dial indicator (max 0.02 mm TIR). Audible bearing inspection at 600 RPM under no load.
• Thermal run test: Motor operated at rated current for 30 minutes. Winding temperature rise must not exceed nameplate ΔT specification.