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Cable-less LSM Elevator System
MagneMotion’s patented Linear Synchronous Motor (LSM) technology is the basis for its LSM Cable-less Elevator System. Designed to eliminate the need for hydraulics or counterweights, cables, and pulley systems, LSM Cable-less Elevators are faster, safer, environmentally friendly, and more efficient than conventional systems. With the ability to transport loads over 20 tons, this system is the perfect solution for applications such as freight elevators; high-rise people movers; industrial, residential and commercial elevators; and weapons and aircraft elevators. To read a recent article on MagneMotion's LSM Elevators in Elevator World Magazine click here.
MagneMotion’s groundbreaking LSM Elevator Technology is the drive system used for the Automated Weapons Elevator on the US Navy’s Ford Class aircraft carrier.
MagneMotion’s LSM Elevator System boasts the following features:
- Higher ratio of capacity to system weight
- Higher speed operation
- Reduced power requirements
- No traveling cable or power rail
- Gearless, environmentally sealed motor
- Reduced maintenance; no high wear parts
- Precise alignment not required; withstands building flexsure
- Longer MTBF and lower MTTR than incumbent systems
- Requires a smaller footprint than traditional elevators
How the LSM Cable-less Elevator System Works
MagneMotion’s Cable-less Elevator System works by installing LSM stators and guide rails on the wall of the elevator shaft, and magnet arrays on an elevator cab that has guidance wheels and brakes. When current is run through the windings in the LSM stator and then interacts with the magnet array on the cab, and electromagnetic field is generated. This magnetic field propels the cab in the direction of the current based on a move profile generated from a higher level control system, which includes acceleration, velocity, and destination information. Inherent to the design is precise position data that is required to locate and propel the vehicle. Each vehicle is independently controlled and many vehicles can co-exist along one trunkway.
- The LSM elevator system requires no cables, counter weights or hydraulics: With a frictionless drive and no constraint based on the available length of cable or weight that a cable could withstand, the elevator can extend to any height imaginable. In addition, with no cable to maintain and solid state electronics, the system realizes high reliability and lower maintenance costs.
- Greater capacity than conventional elevator systems: The LSM system offers speeds in excess of 20 m/s with no increase in cost. Multiple elevator cabs can travel independently within a single elevator shaft increasing throughput and efficiency. When needed, multiple legs can be added to the elevator to increase lift capacity.
- Lower Operational Costs: The system can regenerate power on its descent and the motor is 85% efficient. In addition, stators are only powered when they need to propel a vehicle, thereby decreasing the power consumption of the entire system. Manpower requirements are also reduced because of its maintainability and ability for remote diagnostics, which reduces operating costs further.
- Lower Maintenance Costs: LSM Cable-less Elevators are a frictionless drive system with few moving parts, reducing the need for maintenance while increasing reliabilty. Moreover, the modular design simplifies installation and promotes rapid replacement of components. Finally, the LSM motor can decelerate as well as accelerate the cab, and actually stop the cab at its designated location before parking brakes need to be applied. The result is less wear on the brakes and a reduction in the maintenance required.
- Safety: LSM elevators are designed with a sophisticated control system that provides positive vehicle feedback control, redundancies, and anti-collision logic.
- Flexible Configuration: LSM Elevator Sytems can be configured to propel a vehicle in a vertical and horizontal orientation. This enables cabs to be switched from trunkway to trunkway, enabling the creation of a “one way/up or down” elevator trunk with multiple cabs. Modular stators allow the height of the elevator to be customized at installation and even extended at a future date with minimal disruption. LSM Elevators can also accommodate inclined layouts as an alternative to stairways or escalators.
Practical Application for the US Navy
MagneMotion’s groundbreaking LSM Elevator Technology is the drive system used for the Automated Weapons Elevator (AWE) for the US Navy’s new Ford Class aircraft carrier. The AWE carries 24,000 lbs of ordnance safely and efficiently. MagneMotion delivered 11 elevators for installation on the first carrier in the class, the Gerald R. Ford (CVN-78) which was christened on November 9, 2013.