谁能说说汽车发电机永磁为什么现在很少用了 线圈励磁的好处

2024-12-06 07:23:13
推荐回答(4个)
回答1:

因为汽车发动机转速变化巨大,从几百转至几千转,永磁发电机因励磁固定,电压跟随转速变化。汽车最高速时电压高达40几伏,这么大范围的电压变化,稳压成了难点,调压不易所以很少用了。
线圈励磁的好处是,通过控制励磁线圈的电流,来稳定输出电压。在汽车低速时,加大励磁电流使电压升高,在汽车高速时紧减少励磁电流使压下降,这样就能容易的做到稳压,而且成本低,效果好,维护简单。现在的汽车大多使用线圈励磁发电机。

回答2:

永磁励磁会因为温度、时间、周围磁场而发生变化,并不是永久保持磁场变弱,所以使用较长一段时间后都要更换,另一个永磁不会因为有功或无功负荷的变化自动调节电压也是其一个缺点,如果感性负荷高的话电压就回降低,容性负荷高就回超出额定电压。当然根据质量不同有些进口的机器里永磁部分能使用到其他设备损坏也不会磁场也不会变小。
励磁线圈拟补了以上问题,可以通过程控调节,
希望能帮到你

回答3:

应为永磁发电机输出功率与转速有关,励磁发电机可以更具负载在转速不变的情况下改变输出功率。

回答4:

永磁会随着时间并且重量较线圈的大

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