Increased efficiency and improved p

Increased efficiency and improved power density are
being demanded in the motor industry. To achieve these
goals, along with lower noise and adjustable
speed-
operating capability, other technologies beyond
simple induction motors should be considered. PM
motors have long been recognized as providing higher
efficiency than comparable induction motors. However,
limitations in terms of motor control as well as magnet
material performance and cost have severely restricted
their use. Due to dramatic improvements in magnetic
and thermal properties of PM materials over the past
20 years, synchronous PM motors now represent viable
alternatives. Figures 3 and 4 show the efficiency and
power factor for various motor types [9].

Results (English) 3:

提高效率和提高功率密度是在汽车工业中要求的。为了实现这些目标，以及降低噪声和可调的工作能力，必须考虑其他技术，超越简单的感应电机。永磁电机早就被公认为提供更高的效率比感应电机。然而，在电机控制方面的限制，以及磁铁的材料性能和成本已严重限制使用。由于在过去的20年，同步永磁电机的磁和热性能的磁特性的显着改善，现在代表可行的。图4和3显示了各种型号电机的效率和功率因数[ 9 ]。