Gearless motors for elevator drives
August 2010
Motion Control & Drives
Leroy-Somer’s range of electro-mechanical systems includes gearless drives for new lift installations, as well as for renovation projects that involve the upgrade of existing lifts. “The new XA motors offer high performance solutions in machine roomless lift (MRL) applications and the Z gearless drives are ideal for upgrade and renovation projects,” says Grant Robertson, managing director of Leroy-Somer South Africa. “Leroy-Somer works closely with leading elevator manufacturers during the design phase of a project. The team uses its calculation software and the various lift parameters to propose a solution that complies with all regulatory and safety standards.”
XA series
Gearless motors with internal rotor which are compact and lightweight for easy installation in the lift well. The cigar type design of these motors makes them perfect for use in lift installations with a restricted pit depth. The overhanging traction sheave provides direct access to the grooves and simplifies installation of the cables. The reduced overhead design, due to axial disk brakes, means the motor can be fitted on a beam directly underneath the shaft ceiling. The range covers application requirements up to 2500 kg and a speed of 3 m/s, with a 2:1 roping arrangement. Each motor has a choice of two different sheave diameters in order to prioritise either rated torque or speed. The high efficiency motors have low temperature rise and minimal vibration to give excellent ride performance.
Z series
Gearless motors for new installations or upgrade projects, designed for lifts with a payload of up to 5000 kg and a speed of 5 m/s using a 2:1 roping arrangement. This range, which can handle shaft loads of up to 22 T, has an external rotor and disk brakes on the sheave with manual release levers. This range of permanent magnet synchronous motors is particularly suitable for high capacity lifts, or high-speed applications requiring a double wrap. These motors can also be adapted for the requirements of each installation. Mechanical options for a customised solution include deflection sheaves with chassis, anti-vibration mounts and brake manual release levers. A dedicated electronic card, powered by a 24 VDC battery, can be used for emergency operations.
Motors in the XA and Z range are fitted with failsafe brakes, each with a micro-switch, to comply with global safety codes and offer reduced maintenance requirements.
For more information contact Grant Robertson, Leroy-Somer South Africa, +27 (0)11 455 6212, [email protected], www.leroysomer.co.za
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