Energy efficiency: linear synchronous versus linear drive motor technology

Automation provider Intelligrated claims its linear synchronous motor technology uses about 75% less energy than linear induction motor technology. Table compares results. See photo.


Based on documented results using its newLS-4000E tilt-tray and LS-4000CB cross-belt sorters, Intelligrated (a providerof automated material handling solutions) claims its linear synchronous motor(LSM) technology consumes approximately 75% less energy than comparable sortersystems using linear induction motor (LIM) technology.

According to Intelligrated, the LS-4000's LSMgenerates propulsive force via electromagnetic energy, as opposed to

The linear synchronous motor technology used in Intelligrated's LS4000 line generates propulsive force via electromagnetic energy, as opposed to mechanical friction between moving parts. Source: Intelligrated.

mechanicalfriction between moving parts. This operation reduces energy consumption andnoise levels, while reportedly increasing speed, reliability, and positioningaccuracy. In addition to the LSM drive, the LS-4000E and LS-4000CB is said to featurea modular design that enhances system flexibility and offers fast and easyinstallation and commissioning.

Electrical consumption tests conducted undertypical warehouse conditions demonstrate that, on average, the LS-4000Etilt-tray sorter consumes 2.4 kilowatts per hour of operation. In contrast, energy consumption of a comparablesorter using LIM technology is 10.3 kilowatts per hour. Tests of cross-beltsortation technology demonstrate that the LS-4000CB cross-belt sorter consumesan average of 2.7 kilowatts per hour of operation while energy consumption of acomparable sorter using LIM technology is 11.0 kilowatts per hour. As the chartbelow illustrates, the LS-4000E and the LS-4000CB can provide energy savings of19.8 megawatt hours (19,800 kilowatt hours) per year and over 20 megawatt hours(20,000 kilowatt hours) respectively.

Energy Efficiency Comparison: LIM vs LMS
Energy consumption comparison based on sorter layout with 200-meter length and no level change, operating at 2.0 m/s with 700 mm carts and an average load per tray of 3 kg. Source: Intelligrated.

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- Edited by David Greenfield , editorial director
Control Engineering Sustainable Engineering
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