摘要
针对目前因恒流源励磁方法功耗过大而无法满足电磁水表微功耗要求的问题,提出了基于剩磁原理的微功耗脉冲励磁方法。通过对电磁流量传感器磁场的工作方式进行分析,选择具有高剩磁、低矫顽力的矩形磁滞材料制作磁路,采用双向窄脉冲电压为励磁线圈供电,使磁场稳定反转。根据这一原理,设计了脉冲励磁磁路和双向脉冲发生电路,并进行试验测试。测试结果表明,相对于恒流励磁方法,基于剩磁原理的脉冲励磁方法可以大幅度降低励磁功耗,并且得到稳定的工作磁场,有利于提高电磁水表的使用寿命和流量信号的稳定性。
Aiming at the problem that the power consumption of constant current source excitation method is too large, so the low power consumption requirement of electromagnetic water meter cannot be achieved, a new micro-power consumption pulse excitation method based on remanence principle is proposed. By analyzing the operating mode of the magnetic field of electromagnetic flow sensor, the rectangular hysteresis material featuring high remanence and low coercive force is selected to make the magnetic circuit. The excitation coil is powered by bi-directional narrow pulse voltage;the magnetic field is reversed and stable. In accordance with this principle, the pulse excitation magnetic circuit and bi-directional pulse generating circuit are designed and tested. The results of test indicate that comparing with constant current excitation method, the method based on remanence principle greatly reduces power consumption of excitation, and obtains stable operating magnetic field;these are beneficial to improve the lifetime of the electromagnetic water meter, and the stability of the flow signal.
出处
《自动化仪表》
CAS
2016年第6期86-88,92,共4页
Process Automation Instrumentation
基金
浙江省质量技术监督系统科研计划基金资助项目(编号:20150340)
宁波市自然科学基金资助项目(编号:2016A610204)
关键词
电磁水表
流量计
微功耗
脉冲励磁
矩形磁滞材料
剩磁
矫顽力
磁路
Electromagnetic water meter
Flowmeter
Micro-power consumption
Pulse excitation
Rectangular hysteresis material
Remanence
Coercive force
Magnetic circuit
