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AC motor suits corrosive environs

Posted: 09 May 2007     Print Version  Bookmark and Share

Keywords:AC motors  manufacturing environs  corrosive chemicals 

All-stainless AC motor from Baldor

Baldor Electric India Pvt Ltd has added IEC-frame models to its range of all-stainless-steel washdown-duty AC motors. The company claims to offer energy efficiency with special construction features in the new SSE motors to assure users of extended life and reliability suitable for applications involving exposure to caustic chemicals.

For harsh environs
Designed for maximum corrosion resistance, Baldor's stainless steel motors are particularly suitable for food and dairy product processing as well as pharmaceutical and brewing industries, which frequently employ caustic solutions and high-pressure jets for cleaning. The motors are equally suitable for use in chemical processing and manufacturing plants, as well as for outdoor applications—especially in hostile environments involving corrosive agents such as salt spray.

Baldor's stainless steel SSE motors operate from standard 50Hz three-phase supplies and are available initially in IEC D80, 90, 100 and 112 frame sizes, spanning a power range from 0.37kW to 4kW—with higher-power versions following. Motors with ratings up to 0.75kW employ totally enclosed, non-ventilated (TENV) housings, while higher output models use totally enclosed, fan-cooled (TEFC) enclosures. Users can choose from different mounting options to suit the application.

Premium electrical materials have been used throughout the SSE motor range, to ensure very high operating efficiencies. As a result, all motors exceed EFF1 levels with efficiencies as high as 89.9 per cent for the higher-power ratings, the company said, providing users with significant energy savings in applications involving extended or continuous motor operation.

External construction
SSE motors additionally employ specialised construction and design techniques to maximise performance and reliability in hostile environments. A key feature of the external construction is a welded and lip-sealed conduit box. In combination with a unique hydrophobic aspiration system, this ensures that moisture cannot build up and short-circuit the electrical connections (it also eliminates the need for a drain plug and the mounting issues that this imposes).

All external surfaces—including the casing, mounting feet and flanges, cable conduit box and drive shaft—are constructed from stainless steel, making them virtually impervious to corrosion. And labyrinth seals are used at either end of the drive shaft to prevent the ingress of moisture, and help protect the motor bearings by rotating and expelling contaminants.

Advanced encapsulation
Equal attention has been paid to internal construction. A prime feature is encapsulation of the windings using Baldor's advanced new effusion epoxy encapsulation (E3) process. This provides additional protection against moisture, whether from ingress or condensation. The stator windings employ special inverter spike resistant (ISR) magnet wire to maximise reliability and thermal performance, which is especially advantageous when the motors are used with variable frequency inverter drives.

The motors can also be supplied with stainless steel gearboxes, and in custom versions to suit specific applications.

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