一、引言 涡轮流量计具有精确度高(可达±0.25％)、范围宽度(10:1)、惯性小(毫秒级)、耐压高(可达10MPa)、输出信号为频率信号、容易实现流量积算和定量控制,信号传输距离大等优点而被广泛使用。但是,由于涡轮流量计在工作时涡轮的转速很高,轴承又不能润滑,所以轴承的磨损很快、轴承的寿命很短。这是涡轮流量计的致命弱点,它限制了涡轮流量计的广泛使用。为了解决这个问题,我们采用磁浮轴承代替滚珠轴承,改旋转叶轮形式为旋转叶轮圈形式,使叶轮圈悬浮在流量计的内径中,由于叶轮圈旋转时与其它部位无接触,所以不存在摩擦损耗,磁浮型涡轮流量计的使用寿命基本上取决于驱动电磁线圈的半导体功率模块。半导体功率模块的正常使用寿命大于10000小时,并且半导体功率模块作为流量计的 I. Introduction Turbine flowmeter with high accuracy (up to ± 0.25%), the scope of the width (10: 1), inertia (milliseconds), high pressure (up to 10MPa), the output signal frequency signal, easy to implement Traffic accumulation and quantitative control, signal transmission distance and other advantages are widely used. However, because the turbine flow meter at work, the high speed of the turbine, the bearing can not be lubricated, so the bearing wear quickly, bearing life is very short. This is a fatal weakness of the turbine flow meter, which limits the widespread use of turbine flow meters. In order to solve this problem, we use magnetic bearings instead of ball bearings, rotating impeller in the form of rotating impeller, the impeller is suspended in the inner diameter of the flowmeter, as the impeller rotates without contact with other parts, so there is no friction loss , Maglev type turbine flowmeter life basically depends on the drive of the solenoid coil of the semiconductor power module. The normal life of a semiconductor power module is more than 10,000 hours, and the semiconductor power module acts as a flow meter