Numerical Study on Magnetic Field Characteristics of Electromagnetic Flowmeter with Small Excitation Module

Electromagnetic flowmeter (EMFM) plays an important role in many production processes such as industry, medicine and agriculture. According to the measurement principle, the traditional electromagnetic flowmeter must have a large-size excitation module to provide a uniform magnetic field. However, this structure limits the use of electromagnetic flow meters. The saddle coil design has certain applications in electromagnetic flow sensors. The geometric size of the saddle coil is smaller than the Helmholtz coil and other large coils, so it has certain advantages in practical applications. But it causes the inhomogeneity of the induced magnetic field, which affects the measurement accuracy. This paper analyzes a saddle-shaped excitation module. An extended theory with a small magnetized flowmeter is proposed and compared with the experimental results. The electromagnetic field solution of the finite element program is proposed. The results of this study have certain guiding significance for the design process of the electromagnetic flowmeter excitation coil.