Kollmorgen ServoDisc Motors: 00-S0613-038 / ASML SVG 859-0399-002

Technical Dossier

Product Details And Specifications

Kollmorgen ServoDisc Series: Comprehensive Module Range and Technical Overview

The Kollmorgen ServoDisc series is a family of permanent-magnet DC servo motors engineered for high-precision, high-dynamic-response motion control applications. Characterized by a disc-shaped (pancake) rotor with zero iron in the armature, the ServoDisc design eliminates cogging torque and delivers exceptionally low rotor inertia — properties that made it the preferred drive element in semiconductor lithography equipment, precision positioning stages, and medical imaging systems. The ASML/SVG cross-reference 859-0399-002 confirms deployment in wafer-handling and reticle-stage subsystems within photolithography platforms, where micron-level repeatability is a hard requirement. Across chemical processing, nuclear instrumentation, and precision manufacturing, ServoDisc motors remain embedded in legacy motion architectures that cannot be easily re-engineered, making long-term spare parts availability a critical operational concern.

The Evolution of ServoDisc Architecture

Kollmorgen introduced the ServoDisc topology in the 1970s as a direct response to the limitations of conventional wound-rotor DC motors in servo applications. The ironless disc armature — a printed or etched copper winding bonded to a non-magnetic substrate — produces no reluctance variation as it rotates, eliminating the torque ripple that degrades positioning accuracy in iron-core designs. Early production variants (U-series, E-series) were paired with analog velocity-loop amplifiers and tachometer feedback. Through the 1980s and 1990s, the platform evolved to accommodate encoder feedback and digital drive interfaces, producing the M-series and the application-specific OEM variants such as the 00-S0613-038 (ASML/SVG 859-0399-002), which integrates a custom shaft configuration and winding specification matched to the SVG lithography stage drive requirements. By the early 2000s, Kollmorgen transitioned its primary servo motor development to the AKM and TBM brushless AC series. The ServoDisc line entered a maintenance-only lifecycle phase; production of standard catalog frames was discontinued progressively between 2005 and 2015. Replacement with brushless equivalents requires full drive system redesign, making original ServoDisc units and verified refurbished stock the only viable path for installed-base maintenance.

ServoDisc Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed members of the Kollmorgen ServoDisc product family, organized by frame size and application class. Each entry reflects a distinct winding, shaft, or feedback configuration.

00-S0613-038: OEM disc motor, ASML/SVG 859-0399-002 cross-ref, precision stage drive
U9M4H: 4 in. frame, high-voltage winding, general-purpose servo axis
U12M4H: 4.7 in. frame, medium inertia, velocity-loop servo
U16M4H: 6.3 in. frame, extended torque range, machine tool feed axis
U9M4: 4 in. frame, standard winding, analog tachometer output
U12M4: 4.7 in. frame, standard winding, analog tachometer output
U16M4: 6.3 in. frame, standard winding, analog tachometer output
E-09-1: Early-series 3.5 in. disc motor, brush-type commutation, low inertia
E-12-1: 4.7 in. early-series, medium torque, brush commutation
M-09-3: M-series 3.5 in. frame, encoder-ready, digital drive compatible
M-12-3: M-series 4.7 in. frame, encoder-ready, digital drive compatible
M-16-3: M-series 6.3 in. frame, high torque, encoder-ready
U9M8H: 4 in. frame, high-voltage 8-pole winding, reduced ripple
U12M8H: 4.7 in. frame, 8-pole high-voltage, precision positioning
U16M8H: 6.3 in. frame, 8-pole high-voltage, heavy-duty servo axis
00-S0512-024: OEM variant, semiconductor equipment application, custom shaft
00-S0714-052: OEM variant, larger frame, extended continuous torque rating

Sourcing Hard-to-Find & Obsolete ServoDisc Parts

DriveKNMS maintains a dedicated inventory program for discontinued Kollmorgen ServoDisc frames. Because the ServoDisc series has been out of standard production for over a decade, sourcing strategies must account for three supply tiers: new-old-stock (NOS) units pulled from decommissioned equipment, professionally refurbished units with verified winding resistance and brush condition, and remanufactured units where the disc armature has been rewound to original specification. For OEM-specific variants such as the 00-S0613-038 / ASML SVG 859-0399-002, DriveKNMS cross-references the OEM part number against the Kollmorgen engineering drawing database to confirm dimensional and electrical equivalence before shipment. All units are tested under load prior to dispatch. Lead times for rare frames are quoted individually; customers are encouraged to submit multi-line requisitions to allow consolidated sourcing across a single service event.

Quality Control for the ServoDisc Range

ServoDisc motors present specific test challenges due to their disc armature construction and brush-commutator interface. DriveKNMS applies the following protocol to all ServoDisc units processed through its facility: (1) Winding resistance measurement — four-wire Kelvin measurement across all commutator segments to detect open circuits, shorted turns, or high-resistance joints in the etched armature. (2) Insulation resistance test — 500 V DC megohm test between winding and frame to confirm dielectric integrity of the disc substrate. (3) Brush and commutator inspection — dimensional check of brush length against minimum wear limit; commutator surface assessed for grooving, contamination, and concentricity. (4) No-load run test — motor driven at rated speed in both directions; back-EMF waveform captured and compared against reference to confirm armature symmetry. (5) Loaded torque verification — output torque measured at rated current using a calibrated brake dynamometer; result compared against nameplate continuous stall torque specification. (6) Encoder/tachometer output check (where fitted) — signal amplitude, frequency linearity, and index pulse integrity verified across the operating speed range. Test records are retained and available upon request for traceability-critical applications such as semiconductor and nuclear installations.