MAAG™ WPU two-stage gear unit up to 1500 kW

The smaller MAAG™ WPU two-stage gearbox series was especially developed to drive small vertical mills.

Small MAAG WPU for Coal Mills - ready for dispatch
  • Technical Description
  • Customer Benefits
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Technical Data

FLSmidth MAAG Gear distributes two MAAG WPU gear unit series based on the same design concept. The smaller MAAG WPU series from type 01 to 59 described here is focused on small vertical mills, e.g. coal mills in the cement, thermal power plant and steel industry.

Fields of application
The smaller MAAG WPU two-stage gearbox series is widespread and well proven in small vertical mills and coal mills used in

  • Cement Plants
  • Power Plants

Hazardous environments
The coal grinding system must take into account the available heat sources for drying the raw coal as well as the fire and explosion hazards of coal dust. The entire grinding plant must therefore be shock-resistant and equipped with a number of explosion relief valves.

Casing with internally toothed ring gear
The casing of the MAAG WPU two-stage gear unit consists of a robust welded steel structure. The fixed ring gear is bolted to the casing so that reliable torque transmission is guaranteed. The grinding load including grinding table weight is transmitted straight to the foundation via the tilting-pad thrust bearing and the casing wall.

Both bevel and planetary stage gears are made from very high-quality materials, precisely cut on top class machines and heat treated in fully controlled equipment. The toothed flanks of the sun pinions have both profile and longitudinal modifications to fully compensate for deformations of the sun pinion and planet wheels occurring under load. This method guarantees optimum tooth flank contact and very long life cycle.

MAAG WPU two-stage gear unit types
Small series (for coal mills):
Types range from WPU-04 to WPU-48
Power range from 3,8 to 43 P/n (kW/rpm)

Large series (click here for more details):
Types range from WPU-54 to WPU-420
Power range from 42 to 320 P/n (kW/rpm)

Additional Components

Auxiliary Drive / Maintenance Drive
Auxiliary or maintenance drives are available to meet your demands. The maintenance drive is placed between the mill motor and the MAAG WPU gear unit, whereas the auxiliary drive is located behind the mill motor. The maintenance drive is a low budget drive for build-up welding on the mill table, or for convenient replacing of the lining plates. The auxiliary drive can be used when the mill starting procedure requires a start with its help. It is equipped with a claw type overrunning clutch and a fluid coupling. The fluid coupling provides a smooth start up while the overrunning clutch disengages automatically when the mill motor has started.   

Our standard supply includes a flexible coupling with the following features:

  • durable and reliable
  • low operating costs
  • almost maintenance free (no lubricants to change)
  • low vibratory loads in the drive train
  • relatively wide range for axial and radial misalignment   

Lubrication Unit
The MAAG WPU two-stage gearbox is lubricated by a closed circuit oil system. The oil tank serves as a platform on which all the assemblies and components such as motor pumps (high and low pressure), switchable double oil filter, oil cooler and instrument panel are installed.  

Condition Monitoring
To ensure highest reliability and lowest maintenance costs, the gear unit is equipped with diagnostic tools and sensors monitoring all important operation parameters.

Your reasons to choose FLSmidth MAAG Gear

  • High operational reliability
  • Customer-specific design of gear units
  • Very high efficiency
  • Planetary gear stage and thrust bearing for grinding table with a very long  service life
  • Short installation time
  • Low-cost maintenance
Download MAAG WPU up to 1500kW
MAAG Gear WPU up to 1500kW
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