Research on sinusoidal alternating magnetic field therapy system based on inverter technology
10.7687/j.issn1003-8868.2018.04.030
- VernacularTitle:基于逆变技术的正弦交变磁场治疗系统的研究
- Author:
Quan-Li LIU
1
;
Yuan-Liang ZHANG
;
Hong-Chao ZHANG
;
Qian-Kun LI
Author Information
1. 大连理工大学机械工程学院
- Keywords:
inverter technology;
sinusoidal alternating magnetic field;
equivalent area method;
variable speed integral in-cremental PID;
magnetic field strength
- From:
Chinese Medical Equipment Journal
2018;39(4):30-34,38
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop a sinusoidal alternating magnetic field therapy system in order to overcome the disadvantages of the single output frequency and the low effective value of the output magnetic field strength of the alternating magnetic field therapy system in the market,of which the frequency and magnetic density both were continuously adjustable. Methods Multi winding Helmholtz coil was used as the magnetic field generator.On the basis of inverter technology,bipolar equivalent area method considering dead zone and variable speed integral incremental PID control algorithm were used to achieve the accuracy control of magnetic frequency and density in the coil.The accuracy of the resulting waveform and the accuracy of the magnetic field strength was verified by simulation calculation and system current and magnetic field strength test.Results The magnetic field treatment system gained high performance,total harmonic distortion (THD)of sine wave met the requirements of international standards.The obtained magnetic density was as expected of the simulation and calculation. Conclusion The device provides continuously adjustable magnetic field,which has a positive effect on the research for the medical staff, and technical references are provided to the research of magnetic field therapy system.
