【摘要】 针对中小变压器和电机生产企业对电工钢片铁损现场检测的需求,利用基于数字反馈法的波形控制技术,研制了一款电工钢片单片铁损测试仪。首先采用STM32F103RC微控制器内部集成的12位DAC产生励磁信号;接着采样U型测试探头的磁感应强度信号以进行波形控制,使得磁感应强度及波形系数误差均小于0.1%;最后同步采样励磁电流和感应电压,进行铁损计算。实验结果表明,该测试仪有效地保证了磁感应强度及波形系数误差均小于0.1%,满足单片铁损测试过程中磁感应波形正弦的要求;提高了铁损测试速度和精度。更多还原

【Abstract】 Aiming at the small enterprises of transformer and electrical motor of iron loss on-site testing requirements,a single sheet tester based on digital feedback to control the waveform was designed.The 12-bit DAC of STM32F103RC was firstly used to produce the excitation current and the induced voltage was sampled,the errors of the flux density and waveform factor were adjusted within 0.1% by waveform controlling.Then the excitation current and induced voltage were synchronous sampled and the iron loss was calculated.The results show that,the errors of the flux density and waveform factor are both effectively ensured within 0.1% by the single sheet tester,the waveform of flux density can meet the requirement of sinusoidal.So the speed and accuracy of iron loss testing are improved.更多还原