单位台
数量1
包装方式原厂标准
发货地福州
质保一年
ABB电机选型注意事项
除了根据周围环境条件选择电动机以外,电动机的功率必须与生产机械负荷的大小及其持续或间断的规律相适应。电动机选得过大,将形成大马拉小车,并使功率因数降低,造成设备及电能的浪费;电动机选得太小,将形成小马拉大车,又势必引起工作时过负荷导致电动机过热。过热对电动机的绝缘是很不利的,这不仅会加速绝缘的老化,缩短电动机使用年限,而且还可能由于绝缘损坏造成事故。
运行时,必须保持电动机各部分的温度不**过高允许温度。为了地反映电动机的发热,还规定了电动机的大允许温升,即电动机高允许温度。目前电动机是按周围环境温度40℃设计的,即在周围环境40℃时具有额定功率。如果周围环境温度高出40℃,电动机应降低功率使用。一般温度每提高5℃,应降低功率5%;如果周围环境温度低于40℃,可适当提高电动机功率5%~8%。应当注意,老系列的电动机都是按照周围环境温度35℃设计的,35℃时具有额定功率,40~C时允许的功率应当比额定功率降低5%。电动机过热不一定是由于负载过重或周围环境温度过高而造成的。三相电动机单相运行、电动机内部绕组或铁芯短路、装配或安装不合规格等因素,都可能造成电动机过热。
选用电动机时,除要考虑到环境和功率的要求之外,还要考虑到转速、启动、调速、机械特性和安装等要求。
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