TAILIEUCHUNG - Electric Machines and Drives Part 2

Tham khảo tài liệu 'electric machines and drives part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Premium Efficiency Motors 9 now Eff3 disappears in the new classification. This new classification will be probably soon adopted worldwide in place of regional or local classification as illustrated in table 1. This new standard defines efficiency classes and their containing minimum values conditions . Efficiency Class IEC USA Canada CEMEP China Super Premium efficiency IE4 - - - Premium efficiency IE3 NEMA Premium - - High efficiency IE2 EPAct EFF1 Class 1 Standard efficiency IE1 - EFF2 Class 2 Below standard efficiency - - EFF3 Class 2 Table 1. International motor efficiency classification 6. Life cycle cost Premium motors An electric motor is somewhat cheap to buy but expensive to run. For example a 3 hp Premium efficiency motor functioning 6 000 hours per year consumes about 1000 of electricity at kWh. The purchase price for such a motor is about 500 and over the motor s 15-year life the acquisition price represents only 3 of the lifetime costs while the cost of electricity accounts for 97 . Finally a 2 increase in Premium motor efficiency over EFF1 translates in energy savings over that time nearly twice the cost difference. In addition with a larger motor the saving potential will be larger and therefore payback periods would be shortened. For the 100 Hp motor the acquisition price represents only 1 of the lifetime costs while the cost of electricity accounts for 99 Fig. 4 depicts typical lifetime cycle cost motor in the conservative case Benhaddadi Olivier 2010a . The average life cycle of the small power motors is of the order of 15 years . the equivalent of the average car range. The fundamental difference is in the fact that during this period the cost of the electricity will represent 97 of the cost of useful life cycle of the electric motor while for the car motor it represents only 10 . Moreover the car s internal combustion motors can rarely overcome 50 efficiency with an enormous negative impact to be paid in environmental pollution. We can

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