System Overview

5.1.7Magnetic Levitation Module (MLM)

The Magnetic Levitation Module provides control of the active magnetic levitation hardware.

The Liebert FS has a unique active magnetic levitation system that fully levitates the flywheel-rotat- ing group, allowing the flywheel to rotate without any physical contact. This has a number of advan- tages over mechanical bearing systems:

•Reduced drag- Mechanical bearings have a drag that is proportional to the square of the speed. The levitation system developed by Liebert uses the same power regardless of speed.

•Reliability and zero maintenance- The levitation system ensures there is no contact between the rotating parts and the housing and therefore there are no components to wear out. This ensures the unit will operate maintenance free for the life of the system.

The levitation system, works by measuring the displacement using a capacitive sensor, if the distance needs to be adjusted; the current to the electromagnet is altered to change the displacement, each axis is measured and controlled separately with its own capacitive sensor, electromagnet and feed- back loop which, is controlled by the MLM. This is all done using analog control so it is very fast act- ing and reliable. There are 5 different circuits working independently, these are: Radial: Upper X, Y; Lower X, Y and Axial: Z Only

The principle of operation is the same in each case. The upper radial Y-axis is shown in Figure 37.

Figure 37 Schematic of the levitation system

 

Z

 

 

 

Y

 

 

X

AMPLIFIER

 

AMPLIFIER

 

 

 

 

ELECTRO

ROTOR

ELECTRO-

 

MAGNET

 

 

 

MAGNET

 

CAPACITIVE

 

 

 

DISPLACEMENT

 

 

 

MEASUREMENT

 

 

 

 

CONDITIONER

 

 

 

 

CONTROLLER

DISPLACEMENT SIGNAL

INFRARED EMITTER

DISPLACEMENT SETPOINT

Active Magnetic Levitation Hardware

The electromagnets and capacitive displacement sensors that provide the active magnetic levitation are located within the flywheel module. See 5.1.7 - Magnetic Levitation Module (MLM) for a full description of their operation.

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Emerson Series 600, SERIES 600T user manual Magnetic Levitation Module MLM, Active Magnetic Levitation Hardware
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Series 600, SERIES 600T specifications

The Emerson SERIES 600T, as part of the SERIES 600 line, is a sophisticated device designed to meet the demands of industrial automation and control systems. Renowned for its reliability and versatility, the SERIES 600T excels in various applications across multiple sectors, including oil and gas, chemical processing, and power generation.

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