Abstract:

Based on the inverse effect principle of magnetically controlled shape memory alloy (MSMA), a kind of sensor that uses MSMA material as the core device is developed, which can convert mechanical force into electromagnetic signal. Combined with the basic principle of magnetic circuit design and ANSYS finite element analysis software, in order to increase the magnetic induction intensity of the air gap and induced voltage value, reduce the excitation power, the optimal design and simulation of the sensor structure were realized via modefying paraments including the permanent magnet size, permanent magnet thickness, length of the polymer head and length of the air gap. The magnetic field distribution of the optimized sensor is more uniform and the overall performance is improved. The experimental results show that the change trend of the sensor output induced voltage is consistent with the experimental results, and the values are basically consistent, which verifies the correctness and rationality of the sensor structure optimization.

Key words: MSMA sensor, optimal design, structural simulation, experimental study