15 Synchronous Generator Design

15 Synchronous Generator Design - Synchronous Generator...

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Synchronous Generator Design
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Part 1 – General Considerations
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Synchronous Generator System
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Rotor Peripheral Speed The maximum allowable peripheral speed of the rotor is a central consideration in machine design. With present-day steel alloys, rotor peripheral speeds of 50,000 ft/min (or about 250 m/s) represent the design limit. 1 ft/min = 0.0051 m/s Example: A two-pole, 60-Hz generator has a synchronous speed of 3600 rpm. If the machine must e capable of sustaining a 20% over speed and the maximum allowable rotor peripheral t/ 0.005 /s be capable of sustaining a 20% over speed and the maximum allowable rotor peripheral speed is 50,000 ft/min, determine the maximum allowable rotor diameter ( D r ). in 21 . 44 600 12 50000 12 max r r v D 3600 2 . 1 2 . 1 s n 2 2 2 . 1 2 2 . 1 2 . 1 max max r m r m m r D f D r v Note: rev/min) in ( 2 . 1 ) length/min in ( 2 . 1 length/s) in ( max m r m r r n v f v D J. J. Cathey, Electric Machines: Analysis and Design Applying MatLab, pp. 477, McGraw Hill, 2001.
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Resistivity of Copper vs Temperature The resistivity of copper versus temperature can be calculated using the following formula: ) ( ) ( ) ( 0 0 T T T T Cu Cu Cu where is a reference temperature and is a constant T u p give by 0 Cu C in/ 10 668 . 2 o 9 Cu or: C m/ 10 775 . 6 o 11 Cu At , we have C 20 o 0 T C in/ 10 679 . 0 ) ( o 6 0 T Cu or: C m/ 10 724 . 1 ) ( o 8 0 T Cu
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Part 2 – Armature Design
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Number of Armature Slots For a m-phase synchronous machine, the number of armature ots is ultiples of P A. Integral S/P slots ( S ) is multiples of mP . Example: For a 2 pole machine, the number of slots can be 6,12,18,24,30,36… For a 4 pole machine, the number of slots can be 12, 24,36,… Integral S/P may cause extensive cogging or detent torque since Fractional /P all pole faces will line up with slot openings at the same time. B. Fractional S/P For a m-phase synchronous machine, the number of armature ots is ultiples of B u t P kes a fractional number. slots ( S ) is multiples of m . But
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Number of Turns per Coil pk g a e pk g a e rated N f N f V , , , ˆ 44 . 4 ˆ 2 P Dl B pk g pk , 2 ˆ where 1 . 1 / a w a N k N s d p w k k k k the number of ries turns per phase of armature winding
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15 Synchronous Generator Design - Synchronous Generator...

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