Mechanical Technology April 2016

⎪ Power transmission, bearings, bushes and seals ⎪

Aluminium motors for industrial applications

The Bauer range of aluminium three-phase 380 V and 525 V motors are ideal for industrial applications such as fans, compressors, pumps, sanding and drilling machines. Lewis Hiepner, product manager for electric motors at BI talks about their advantages.

“ T he main benefit of Bauer aluminium electric motors is that they are far more lightweight than cast-iron equivalents due to the aluminium casing and end shield,” says Hiepner. “This MS range of aluminium three- phase 380 V and 525 V motors has been supplied successfully to the South African market for the past decade,” he points out. A main feature is the multi-mount design, with the added benefit of being able to change the feet on-site. This gives the customer the option of having the terminal box on the top or on the left or right hand side, depending on the specific requirements. In addition, Bauer motors can be fitted with an ac or dc external brake. The ac brake is specifically for instant stopping when the power is switched off. Applications include bottling plants

where stopping accuracy is critical. The dc-type brake, on the other hand, is slower to react. This is due to the brake’s electrical power having to pass through a rectifier in order to convert ac back emf into dc, with a resultant delay. Typical applications include overhead cranes, where stopping accuracy is not as critical. All Bauer motors conform to the relevant IEC standards, as well as being designed for S1 duty. This means that the motors can run continuously for 24 hours under normal load conditions. Another feature is the Class F insulation, with a ‘B’ temperature rise of 80 °C from a maximum ambient temperature of 40 °C, which gives a maximum operating temperature of 120 °C. A vacuum pressure impregnation system is used in manufacturing the insulation. The motors are also IP55 weatherproof, meaning that they can

Bauer aluminium motors are far more lightweight than cast iron equivalents.

withstand normal weather conditions if the cable termination to the terminal box is carried out correctly. The Bauer range is also water, dust and vermin proof. “It is part of our strategy of being a total solutions partner for our custom- ers to stock some of the best products and brands from around the world, and the Bauer range definitely falls into this category,” adds Ross Trevelyan, business unit head: product and engineering at BI. BI recently launched a new brand identity with the aim, according BI CEO, Burtie Roberts: “To become a proactive company and to ensure we are the pre- ferred supplier.” q

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Mechanical Technology — April 2016

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