International lift drive systems and alternator manufacturer Leroy-Somer says that, through its research and development initiatives, the company has developed a range of electro- mechanical systems, which includes gearless drives for new lift installations, as well as for renovation projects that involve the upgrade of existing lifts.
“The gearless Leroy-Somer XA motors offer high-performance solutions in machine roomless lift (MRL) applications and Z gearless drives for upgrade and renovation projects,” says Leroy-Somer South Africa MD Grant Robertson.
He adds that the company works closely with leading elevator manufacturers to ensure efficient performance and optimum safety in all lift applications, from home installations to lifts used in demanding high-rise buildings.
“During the design phase of each project, the Leroy-Somer team integrates a number of lift parameters in its calculation software, which enables the company to propose a solu- tion which complies with all regulatory requirements, including stringent safety standards,” Robertson explains.
Gearless XA motors, which have an internal rotor, are compact and lightweight for easy installation in the lift well. The cigar-type design of these motors makes them suited for use in lift installations with a restricted pit depth. The overhanging traction sheave provides direct access to the grooves and simplifies the installation of the cables. The reduced overhead design, owing to axial disk brakes, means that the motor can be fitted on a beam directly underneath the shaft ceiling.
The XA range covers application requirements up to 2 500 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 – this feature optimises the size of the selected machine.
These high-efficiency motors have a low temperature rise and ensure minimal vibration, resulting in improved ride performance.
Further, this series also includes motors that are suitable for the residential market. The XAP1 units are designed for loads of up to 450 kg and a speed of 0,2 m/s with a 2:1 roping arrangement.
Gearless Z motors, for new installations or upgrade projects, are designed for lifts with a payload of up to 5 000 kg and a speed of 5 m/s, with 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, antivibration mounts and brake manual release levers. A dedicated electronic card, powered by a 24-V battery, can be used for emergency operations.
Gearless motors in the XA and Z range are fitted with fail-safe brakes, each with a microswitch, to comply with global safety codes. Another important feature is reduced maintenance requirements.
These permanent magnet synchronous machines, with low noise levels, ensure outstanding ride performance and optimum safety in all lift applications.
The company reports that it has a long tradition of innovation, the result of experience accumulated in the major industrial markets of the world over more than 80 years.
The company is equipped with a highly efficient research and development organisation, having powerful calculating and modelling resources at its disposal. Research is also carried out in close collaboration with universities or private laboratories and specialist organisations.
The company believes that experience leads to anticipation of market requirements and the research to meet these requirements. Today, 50% of the products made by the company did not exist five years ago.
The company’s main areas of research include in-depth knowledge of physical phenomena and the formation of related laws, the study of machine behaviour using calculation and simulation software, the evaluation of the characteristics of mate- rials used, and improved tailor- ing of components for drive systems, from the most basic to the highly complex, and testing of new drive principles.