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6ES7231-5QF32-0XB0
电机造价较高;在恒功率模式下,操纵较为复杂,控制系统成本较高;弱磁能力差,调速范围有限;功率范围较小,受磁材料工艺的影响和限制,大功率仅为几十千瓦;低速时额定电流较大,损耗大,效率较低;永磁材料在受到振动、高温和过载电流作用时,其导磁性能可能会下降或发生退磁现象,将降低永磁电动机的性能,严重时还会损坏电动机,在使用中严格控制,使其不发生过载。永磁材料磁场不可变,要想增大电机的功率,其体积会很大;抗腐蚀性差;不易装配。
我们先比较各种电机的发展历史,从下图我们可以看到,有刷直流电机、一般同步电机、感应电机与有刷磁铁电机商品化历史长,其产品更新换代不断,而且迄今还在应用。而自上世纪80年代开始进入商品化的表面永磁同步电机与1990年代以来研制开发的开关磁阻电机、内置式永磁同步电机以及新的同步磁阻电机相继进入市场,并在电动汽车与混合动力车上获得应用。
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