Belt Driven Permanent Magnet AlternatorThe existing Alternator used in conventional SG AC coaches cannot be fitted in the LHB-FIAT bogies due to space constraint in FIAT bogies. At this stage, Indian Railway was in look out for a smaller size alternator which can be fitted within the space available. It was well-known that the size reduces considerably with the use of a permanent magnet alternator and that gave the lead. Two numbers of belt driven 30 kW alternators with permanent magnet were developed and installed on a coach for trial. This design has been developed in close coördination of RCF, RDSO and M/s I.C.Electricals. This coach has been running in regular service since Nov. 2012 with satisfactory performance. The advantage with permanent magnet is due to reduction in the size of the rotor as it does not have winding to generate electric field, and therefore, a reduction in overall size, weight, efficiency, durability and you name the advantage, it is there. But the progress is slow for two reasons(1) Only one source so far and unless there is a competition, the firm will jack up the price. Two more sources, namely HMTD and Signotron has been given dimensional fitment clearance by RDSO.(2) Jacking up the price of permanent magnet in the international market by China finding the demand going up for its useful application in motors and alternators. Developers already finding difficulty in supplying the permanent magnet alternator at a reasonable cost.(3) Permanent magnet alternator is going to be a major source of providing magnetic field in traction motor with the intention of reducing  size and application in low floor height driving coach in metro rakes.  - Study24x7
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Karan Singh
19 Nov 2019 11:31 AM study24x7 study24x7

Belt Driven Permanent Magnet Alternator

The existing Alternator used in conventional SG AC coaches cannot be fitted in the LHB-FIAT bogies due to space constraint in FIAT bogies. At this stage, Indian Railway was in look out for a smaller size alternator which can be fitte...

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