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SZ58-003-1 - Zee Systems DC Compressor Drive Motor

SZ58-003-1 - Zee Systems DC Compressor Drive Motor

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$ 7,999.00 $ 7,999.00

SZ58-003-1 – Zee Systems DC Compressor Drive Motor

Available now on the Airparts.aero Marketplace.

The Zee Systems SZ58-003-1 is a high-performance, aerospace-grade DC motor specifically engineered to drive the vapor-cycle air conditioning (AC) compressors in light-to-midsize turbine aircraft. As a central component of the environmental control system (ECS), the SZ58-003-1 converts electrical energy into the high-torque mechanical rotation required to compress refrigerant (typically R-134a) within the cooling loop. This motor is a "heavy-draw" component, designed to operate under high-duty cycles while maintaining thermal stability in the often-unpressurized compartments where ECS hardware is located.

Engineered for the rigorous standards of Part 23 and Part 25 aircraft, the SZ58-003-1 features a robust internal architecture designed to mitigate the electromagnetic interference (EMI) and radio frequency interference (RFI) that can disrupt sensitive avionics. The motor is characterized by its high power density and specialized brush/commutator assembly, which is optimized for high-altitude operation where lower atmospheric pressure can lead to accelerated brush arcing and wear.

Key Features

  • High-Torque Start Capability: Specifically wound to overcome the high head pressures of a dormant vapor-cycle compressor, ensuring reliable cooling initiation in high-ambient-temperature environments.

  • Precision Balanced Armature: Dynamically balanced to aerospace tolerances to minimize high-frequency vibrations that could lead to structural fatigue of the mounting bracketry or refrigerant line fracturing.

  • Explosion-Proof Design Principles: Constructed with a sealed or shielded housing to prevent internal sparking from igniting any ambient fuel vapors, a critical safety requirement for motors located in wing roots or aft equipment bays.

  • Advanced Thermal Management: Features an integral cooling fan or heat-sink housing (depending on installation) to dissipate heat during prolonged "ground-pull" operations.

  • Replaceable Brush Assembly: Designed for field maintenance with accessible brush ports, allowing for mid-life inspections and extended TBO (Time Between Overhaul) intervals.

Technical Specifications

  • Part Number: SZ58-003-1

  • Manufacturer: Zee Systems, Inc.

  • Component Type: DC Electric Drive Motor

  • Voltage: 28V DC (Standard Aircraft Bus)

  • Current Draw: High-amperage starting transient / Continuous rated running current (Refer to Zee Systems Service Letter for specific load profiles).

  • Rotation: Clockwise (CW) or Counter-Clockwise (CCW) — Verify specific dash-number orientation for your compressor belt-drive or direct-drive setup.

  • Frame Material: Anodized Aluminum / High-Strength Steel Housing

  • Insulation Class: Class H or higher (High-temperature resistance)

  • Certification: FAA-PMA (Parts Manufacturer Approval) for specific airframe applications.

Aircraft Compatibility

  • Cessna Citation Series: 500, 501, 550, S550, 560

  • Beechcraft King Air: 90, 100, 200, 300 Series (Zee Systems AC Conversions)

  • Pilatus PC-12: (Specific ECS configurations)

  • Fairchild Swearingen Merlin/Metro: Supplemental AC systems

  • Note: The SZ58-003-1 is often part of an STC (Supplemental Type Certificate) installation. Always verify the motor part number against the Zee Systems Illustrated Parts Catalog (IPC) or the specific STC paperwork for your aircraft.

Applications

The SZ58-003-1 is used exclusively as the Prime Mover for Vapor-Cycle Air Conditioning. Unlike engine-driven compressors that rely on a belt from the accessory gearbox, this electric motor allows for "Full-Cooling" capability while the aircraft is on the ground using a GPU (Ground Power Unit) without the need to run the propulsion engines.

Why Choose SZ58-003-1?

Choosing a genuine Zee Systems motor ensures that the starting torque curves match the requirements of the compressor head. Off-brand or industrial-equivalent motors often fail to handle the inrush current required to start a compressor against high head pressure, leading to tripped circuit breakers or internal winding burnout. Furthermore, the SZ58-003-1 is built with radio noise suppression filters that are essential for maintaining clear COM/NAV radio reception during AC operation.

The SZ58-003-1 utilizes a series-parallel (compound) winding configuration to provide the high "breakaway" torque necessary to overcome the static friction and initial compression stroke of a reciprocating or scroll compressor. The internal physics involve a high-flux magnetic field generated by permanent magnets or field coils that interact with the armature's electromagnetic field. To combat the Paschen's Law effect—where the dielectric breakdown voltage of air decreases at higher altitudes—the commutator and brush spacing are precision-engineered to prevent "flashover." This ensures that the motor maintains its volumetric efficiency and RPM consistency throughout the aircraft's operational ceiling, providing steady-state cooling from sea level to FL450.

Note: This is a high-amperage electrical component. Ensure the aircraft battery/bus is disconnected before removal or installation. Inspect the drive belt or coupling for proper alignment to prevent side-loading the motor bearings. Installation must be performed by an A&P mechanic in accordance with the Zee Systems Maintenance Manual and applicable STC instructions. Excessive "cycling" of the motor can lead to thermal distress; ensure the AC system pressure switches are functioning correctly.

Documentation