针对传统单轴激振器无法复现线-角空间耦合运动的问题,提出了一种可实现复合振动的电磁式线-角振动激振器磁路结构,并对其气隙磁场特性进行分析。首先构建了激振器的磁路和线圈结构,基于等效电流法,建立了气隙磁场的解析模型,与有限元分析结果的最大相对误差为1.25%,验证了解析模型的正确性;接着研究了各磁路参数对气隙磁场分布特性的影响规律,以及线圈电流产生的磁场与原磁场的耦合效应,并分析了线圈在运动过程中的受力情况;最后研制了激振器磁路拓扑结构样机,分别对线、角振动气隙磁场进行了实验测量,测得结果与有限元计算结果的最大相对误差小于5%,进一步验证了所提出磁路结构的有效性。
Abstract
To solve the problem that the traditional uniaxial vibrator cannot reproduce the linear-angular space coupling motion,a magnetic circuit structure of an electromagnetic linear-angular vibration exciter that can realize compound vibration is proposed, and the characteristicsits of air-gap magnetic field are analyzed. Firstly, the magnetic circuit and coil structure of the exciter are constructed. An analytical model of the air-gap magnetic field is established based on the equivalent current method,and the maximum relative error with the finite element results is 1.25%, which verified the correctness of the analytical model. Then, the influence of each magnetic circuit parameter on the distribution characteristics of the air-gap magnetic field and the coupling effect between the magnetic field generated by the coil current and the original magnetic field are studied,and the force of the coil during the movement is analyzed. Finally, the prototype of the magnetic circuit topology of the exciter is developed, the linear and the angular vibration air-gap magnetic field are measured,and the maximum relative error between the measured results and the finite element results is less than 5%, which further verifies the effectiveness of the proposed magnetic circuit structure.
关键词
振动计量;激振器;等效电流法;线-角振动 /
气隙磁场;电磁耦合
Key words
vibration metrology;exciter;equivalent current method;linear-angular vibration /
air-gap magnetic field;electromagnetic coupling
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基金
国家重点研发计划(2019YFC1509503);浙江省自然科学基金(LY21E050017);国家市场监督管理总局科技计划(2020MK189);宁波市重点研发计划(2022Z092)
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