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Geared motor family spans a broad spectrum

15 March, 2012

At the Hannover Fair in April, Siemens’ Drive Technologies Division will be launching an extensive new range of geared motors. The Simogear family will include helical, parallel-shaft, bevel-helical and worm gear motors with outputs ranging from 0.09–200kW and with output torques up to 50,000Nm.

Siemens says it can now supply a complete portfolio of geared motors. The new models include two- and three-stage designs with high gear ratios, offering fine torque grading, high power densities and high efficiencies. They use standard connection dimensions, making it possible to retrofit them to existing installations. Their compact design and light weight make them easy to handle in confined spaces.

Conventional gears, classified according to fixed torque stages, are included in the Simogear family, which also offers supplementary gear sizes graded to reduce differences in output between the different sizes. As a result, it is possible to choose the right drive in terms of gear type, torque and ratio for any application.

“Siemens has further advanced the standard for geared motors used in industrial drive systems,” says Dirk Bauer, head of standard gears and couplings at Siemens Drive Technologies. “These geared motors combine the benefits of exceptional energy efficiency, high power density and excellent quality. They are ideal for use in conveyor systems.”

The range includes efficient two-stage bevel-helical gear-motors developed specifically for use in conveyor systems. Plug-in pinions result in high gear ratios. The two-stage gears, with efficiencies of at least 96%, can often be used instead of three-stage versions with efficiencies of around 94%. The plug-in pinions also help to reduce the circumferential velocity in the first stage which, in turn, cuts noise levels.

The new geared motors offer a choice of IE2 or IE3 asynchronous and synchronous motors. There is no increase in motor frame size from IE2 to IE3. Reduced-backlash variants of Siemens’ dynamic Simotics synchronous motors can also be mounted directly to the gearboxes.

The geared motors’ compact dimensions have been achieved by using an integrated DE bearing shield on the motor, instead of an adapter plate and bearing shield. The lengths and weights of the bevel-helical versions have been reduced by optimising the pinion shaft bearings. In the lower torque range, the gear and motor housings are made of aluminium.

The modular design means that the new geared motors need fewer components. The output shaft seals have been selected to suit different types of application.

The motors will be introduced to the market in stages.

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