abb_technical_guide4_8feb02

abb_technical_guide4_8feb02 - Guide to Variable Speed...

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Unformatted text preview: Guide to Variable Speed Drives Technical Guide No. 4 Technical Guide No. 4 2 Technical Guide No.4- Guide to Variable Speed Drives 3 Technical Guide No.4- Guide to Variable Speed Drives Contents 1 Introduction .............................................................. General ....................................................................... 2 Processes and their requirements ......................... Why variable speed control? ...................................... Industrial segments with VSD processes ................... Variables in processing systems ................................ Machines are used to alter materials' properties ....... Well defined shape ................................................. Indefinite shape ...................................................... ...and to transport materials ...................................... Solid materials ....................................................... Liquid materials ..................................................... Gaseous materials................................................. 3 The workhorse of industry: The electric motor ... Electric motors drive most machines ........................ Motors convert electrical energy into mechanical ...... energy ........................................................................ Frequency converters control electromagnetic induction ..................................................................... The efficiency of the drive system............................. Reversed rotation or torque is sometimes required .. The load, friction and inertia resist rotation ............... The motor has to overcome the loading torque ........ The drive torque and load torque are equal at nominal speed ........................................................ 4 Variable volumes require some form of control Variable material flow and input/output requirements Simpler control methods............................................ The best control method is VSD................................ Mechanical, hydraulic and electrical VSDs................ Hydraulic coupling ................................................. DC drive ................................................................. AC drive ................................................................. Electrical VSDs dominate the market ........................ Maintenance costs................................................. Productivity ............................................................ Energy saving ........................................................ Higher quality ......................................................... The AC drives market is growing fast...........................
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abb_technical_guide4_8feb02 - Guide to Variable Speed...

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