GESHI GTK Permanent Magnet AC Synchronous Motor 5.5-90kW

The GESHI GTK permanent magnet ac synchronous motor provides direct-drive rotation for industrial screw compressors, eliminating mechanical transmission losses. This TEFC motor maintains high operational efficiency across variable load profiles while reducing overall mechanical footprint. Plant operators utilize this unit to eliminate belt slippage and lower long-term maintenance overhead in continuous-duty compressed air stations.

Introduction to the Permanent Magnet AC Synchronous Motor

Industrial compressed air systems often suffer from efficiency drops and mechanical wear associated with traditional induction motors and belt-driven transmission assemblies. When facilities demand continuous pneumatic output under fluctuating load profiles, standard motors experience performance degradation and elevated thermal stress. This integrated unit addresses these operational challenges by utilizing a permanent magnet ac synchronous motor design coupled directly to the compressor airend via an axial shaft connection. This configuration removes intermediate components such as pulleys, belts, and external bearings, thereby eliminating mechanical transmission slip and reducing alignment downtime. Operating at a standard voltage of 380 V within frame sizes spanning H112 to H280, the unit accommodates diverse power requirements from 5.5 kW to 90 kW. Thermal management is handled through two distinct cooling configurations, namely a liquid-cooled variant supporting water or oil circulation and an air-cooled version featuring an independent axial cooling fan. By integrating the rotor directly onto the compressor shaft, the drive architecture achieves high power density and consistent torque transmission across standard industrial duty cycles.

Technical Specifications

Power Rating: 5.5 kW - 90 kW @ 380 V

Frame Size: H112 - H280 @ 380 V

Rated Voltage: 380 V @ 50 Hz

Mounting Type: B3 @ Standard Foot Mount

Ingress Protection: IP54 @ IEC 60034-5

Insulation Class: Class F @ 155 °C Temperature Rise Limit

Efficiency Level: Grade-2 Efficiency @ Full Load

Cooling Method: Liquid-Cooled (Water/Oil) or Air-Cooled (TEFC) @ Ambient Operation

Drive Configuration: Axial Direct Drive @ Screw Compressor Integration

System Integration and Hardware Setup

Integrating the unit into an existing compressor skids requires strict adherence to electrical and mechanical alignment procedures. The motor utilizes a B3 foot-mounted configuration, requiring secure bolting to a rigid mounting plate to prevent resonance during high-torque startup phases. Electrical supply connections must use shielded power cables routed through appropriate cable glands to maintain the IP54 protection rating against dust and moisture ingress. Proper grounding of the motor frame is mandatory to eliminate electromagnetic interference and prevent stray currents from damaging internal rotor magnets or bearing assemblies. For liquid-cooled variants, coolant flow rates and fluid temperatures must be calibrated prior to system commissioning to ensure thermal stability within the stator windings. Control wiring for thermal sensors and external monitoring devices must be isolated from high-voltage power lines using dedicated metal conduit or separated cable trays to preserve signal integrity.

Reliability and Environmental Durability

Long-term operational stability in harsh industrial environments depends on robust thermal and mechanical protection mechanisms. The motor achieves an IP54 protection rating, safeguarding internal electrical components from airborne particulate matter and water splash. Class F insulation materials provide high thermal endurance, allowing the stator windings to withstand elevated operating temperatures without degradation of dielectric strength. The elimination of belts and external transmission bearings reduces mechanical failure points, extending the mean time between failures across continuous industrial duty cycles. Thermal management through optimized liquid circulation or independent axial fan cooling prevents localized hotspots within the permanent magnet rotor assembly. These design characteristics ensure consistent performance in ambient temperatures typical of heavy manufacturing plants and compressor rooms.

Selection Guidance and Alternative Options

Selecting the appropriate motor variant requires evaluating the specific cooling infrastructure and power demands of the host screw compressor application. Facilities with closed-loop water systems or oil-cooling circuits can deploy the liquid-cooled version for high-density thermal dissipation, whereas standard ambient installations benefit from the air-cooled TEFC architecture. Beijing Zhongping Technology provides technical support and engineering consultations to assist procurement teams with cross-reference selection, matching specific frame sizes and power ratings to existing equipment requirements.

Frequently Asked Questions

1. What is the standard delivery timeline and local stock availability for these motor units?

Beijing Zhongping Technology maintains local stock reserves of standard power ratings to ensure rapid fulfillment and minimize facility downtime.

2. What are the terms of the product warranty and the RMA replacement procedure?

The units are backed by a standard 12-month manufacturing warranty, supported by pre-shipment quality verification and streamlined local replacement services through Beijing Zhongping Technology.

3. What are the electrical supply specifications and grounding requirements for safe operation?

The motor operates at a rated voltage of 380 V and requires secure structural grounding to the main chassis to dissipate stray currents and prevent electrical noise interference.

4. Which cooling method should be selected for high-ambient operating environments?

The liquid-cooled variant using water or oil circulation is recommended for environments with high ambient temperatures or restricted ventilation spaces.

5. What maintenance checks are required for the TEFC air-cooled motor variant?

Periodic inspection of the independent axial cooling fan and cleaning of cooling fins are necessary to maintain unimpeded airflow and prevent thermal accumulation.

6. How does the axial direct-drive mechanism affect routine mechanical maintenance?

The absence of belts and transmission pulleys eliminates the need for periodic belt tension adjustment and reduces bearing replacement frequency.

7. What ingress protection rating does the motor enclosure provide against environmental contaminants?

The unit features an IP54 protection rating, preventing harmful dust accumulation and water splashes during normal industrial operation.

8. Can these synchronous motors be integrated with standard variable frequency drives?

The motor design is fully compatible with standard vector control drives capable of driving permanent magnet synchronous machines across the specified power range.