Drive Technology Mini turbine with maximum performance
TZB motors open up new applications for turbines
Atlas Copco was the first manufacturer to introduce turbine angle grinders. The Swedish company sparked a revolution with its hand-held GTG pneumatic tools because they brought enormous productivity and performance benefits combined with significantly improved ergonomics. Now, Atlas Copco has transferred this quantum leap to its drive systems and is presenting its latest turbine motors in the TZB-25 series. “We have shrunk a two-stage axial-flow turbine to about the size of a cigarette packet. Despite its minimal size, the turbine has an effective output of 2.8 kilowatts (about 3.9 hp),” says project manager Jörg Rüßmann, proudly describing the successful results of downsizing.
"The new speed-governed high-torque turbine motors in the TZB series have been developed for universal industrial use and are a new contribution by Atlas Copco Tools to greater efficiency in drive systems" , says product manager Jörg Rüßmann.
Downsizing reduces air demand by up to 40 percent
This size reduction is not an end in itself but a contribution to considerably greater efficiency in drive systems, the Atlas Copco Tools manager responsible for air motors explains: “One key advantage over conventional vane motors is considerably higher efficiency, associated with higher performance. The turbine reduces specific air consumption referred to its output by an impressive 25 to 40 percent.”The heart of the new TZB-25 turbine from Atlas Copco may remind you of an aircraft engine but it is only as long as a cigarette packet and has an output of 2.8 kilowatts. The main advantages of the TZB motors are their extremely high power density, the reduction in air consumption of up to 40%, genuine oil-free operation and ATEX certification. Other attractive design features of the new TZB turbines include their extremely compact size, long service life and minimal wear. The blue arrows indicate the flow path of the compressed air in the turbine.
Lighter weight and reduced space requirements
For fixtured motors, the space available is often the limiting factor. “Space is always at a premium but the TZB 25 does not need to fear comparison with conventional motors,” Rüßmann explains: “Even including the output shaft, the adapter and the gearbox to reduce the turbine speed of 60,000 rpm to the required rotation speed for the drive, this power pack is no more than 364 mm long.” He also says that the miniature turbine saves considerable weight. This not only makes things easier for the fitters who have to install the motors on the relevant equipment but also makes these motors especially attractive for use on robot arms and manipulators. “One customers installed two TZB units, which only weighed 3.5 kg, on mobile welding equipment for pipelines. Because of their absolutely oil-free operation, their impressive output and their high torque, these motors are the ideal drive systems for bevelling pipe ends, ensuring maximum material removal rates and high productivity in preparation for the welding process.” The relatively quiet turbine, which functions without contact in contrast to conventional vane motors and is practically not affected by wear, is also well-suited for applications in automation technology and in potentially explosive atmospheres.
The entirely new TZB motor range consists of a total of 16 motors with integrated speed governors. Eight operate in a clockwise and eight in an anticlockwise direction. Models with speeds ranging from 70 to 470 rpm and with torque values from 48 to 305 newton-metres are available.
Explosion proofing certification in accordance with the ATEX directive, to class EX II 2GD h T4 IIC T135°C X (X = the ambient temperature may be up to 60°C), confirms that the TZB-motors may also be operated at critical facilities such as refineries or chemical plants. The TZB high-torque motors have been developed for universal industrial use and are available with immediate effect.