TAW Increased-Safety Brushless Synchronous Motor, 450-15000 kW

The TAW is the new-generation increased-safety brushless-excitation three-phase synchronous motor from Wolong Nanyang for large, slow-speed drives in hazardous areas. It combines international synchronous-motor design practice with Wolong Nanyang's long experience in increased-safety brushless machines, and integrates explosion protection, power electronics and automatic control in one machine.

The motor is a horizontal box-type design with a flanged shaft end and pedestal bearings. The main machine (stator, rotor, frame, covers and pressurization control) and the AC exciter with rotating rectifier sit in two separate cavities that share one air circuit. The AC exciter and the rotating rectifier sit inside the bearing span, which shortens the machine; the rectifier is mounted on the outer side of the exciter, so it is easy to reach for maintenance.

Key Specifications

Design Features

• Brushless excitation: no slip rings or brushes to maintain in the hazardous area
• Separate cavities for the main machine and the exciter, sharing one cooling air path
• Rotating rectifier on the outer side of the exciter for easy service
• Water-to-air cooling as standard; air-to-air (KK) version available

Applications

Large compressors, pumps and fans in petrochemical, chemical, gas and power plants where a slow-speed, high-power synchronous drive with power-factor control is needed.

Model Code

Example TAW(KK)2500-20/2600: TAW = increased-safety brushless-excitation synchronous motor (water-cooled; KK = air-to-air), 2500 = rated power (kW), 20 = poles, 2600 = stator core outer diameter (mm).

Explosion Protection Explained

Increased safety ("e") prevents ignition by design rather than by containing an explosion: reinforced insulation, larger clearances and creepage distances, secure terminals and limited temperature rise ensure that no arcs, sparks or hot surfaces occur. Equipment marked Gb may be used in Zone 1, Gc in Zone 2. In current IEC 60079-7 the motor levels are marked Ex eb and Ex ec.

Performance Data

Electrical data for the standard ratings in the TAW (new generation) catalog 0AP.138.0287. Click a table to open it; send us the rating you need and we confirm the current data sheet.

Bearings and Lubrication

Sleeve bearings designed to ISO 11687-1, oil-ring self-lubricated or with forced lubrication (oil ISO VG 46 / L-TGA46), with insulation against shaft currents. End-shield bearings are used up to about 4000 kW, pedestal bearings above.

Up to 6500 kW self-lubrication is possible (with a high-pressure jacking-oil system above about 5000 kW when needed). Larger motors use forced lubrication from their own oil unit or from the compressor lube-oil system.

Monitoring and Accessories

• Six Pt100 sensors (three-wire) in the stator slots, two per phase, three working and three spare
• Duplex Pt100 in each bearing, for local display and remote monitoring
• Anti-condensation heaters, 220 V AC: 1000 W (1730 mm core), 1500 W (2150 mm) or 2400 W (2600 - 3250 mm) for the main machine, plus 300 W for the exciter
• Leak detector under the air-to-water cooler (cupro-nickel BFe10-1-1 tubes, pressure-tested at 1.5 × working pressure)
• Differential-protection current transformers in the main terminal box above 2000 kW
• Rotating rectifier and resistors with their own component Ex certificates; the brushless excitation system applies field smoothly at synchronisation, without shock or vibration

Purging Before Start

Before every start the enclosure is purged with clean air from a non-hazardous area or with nitrogen, at least five times the free internal volume, at 0.5 - 1.0 MPa supply pressure:

The tE time is at least 5 s. Exact purge data for a given motor are on its outline drawing.

Guaranteed Performance

At rated voltage the catalog guarantees: power factor 0.9 leading, pull-out torque 1.6 × rated, locked-rotor torque 0.6 × rated, nominal pull-in torque 0.6 × rated and locked-rotor current 6.5 × rated. Noise is assessed at 85 dB(A) sound pressure. Tolerances:

All values can also be agreed project by project, for example a higher pull-in torque for a compressor with a loaded start.

Output at Higher Ambient Temperature or Altitude

Rated output applies up to 40 °C and 1000 m. Above that the permissible output, in percent of rated power, is:

For a hot or high site we can also design the motor for the full rating at site conditions; state ambient temperature and altitude in the inquiry.

Common Questions

What power range does the TAW cover?

The TAW covers 450 - 15,000 kW.

Which voltages are available for the TAW?

Rated voltage: 3 kV - 11 kV. Other voltages can be checked on request.

Which explosion protection does the TAW have?

The marking is Ex e IIC T3 Gc. Tell us the zone, gas group and temperature class of your site and we confirm the right version.

How is the TAW cooled?

Cooling method: IC81W (air-to-water, standard), IC616, IC83W; KK = air-to-air.

What is the degree of protection?

Standard protection is IP55.

Documents Supplied with the Motor

For each order we can provide the technical data sheet, outline drawing, routine test report and, for explosion-proof motors, a copy of the Ex certificate that matches the nameplate marking. Tell us in the inquiry which documents your project or your inspector requires, so they are prepared before shipment.

How to Order

For a fast, accurate quotation please send: rated power (kW), voltage and frequency, number of poles or speed, Ex marking or hazardous zone, mounting type, quantity and destination port. For a replacement, a photo of the old motor nameplate is the quickest way to match it. Lead time (about 80 days), documents and shipping are explained on our Export Service page.