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为实现不规则金属工件的梯度加热和功率控制，设计了一种三段式感应器的感应加热电源，可以控制3个感应线圈的分段和联合加热。以铝合金为例，对频率、功率和加热时间等关键参数建立了数学模型并给出了辨识方法；通过建立和分析三段式感应加热电源的等效电路，针对彼此间存在的耦合问题进行了研究，得出了三段以及多段感应器的输出电流同相是功率解耦的关键。根据此理论建立了仿真模型和研制了一台样机，仿真结果表明通过递推最小二乘参数估计算法能够获得理想的辨识模型，加热的频率和功率分别在递推300次和1000次后达到了允许的误差；样机实验结果说明该方法有效地消除了各段感应线圈的功率耦合，能够精确地实现不规则金属的梯度加热和功率控制。“,”To solve the problems of gradient heating and power control in irregularly shaped metals,we design a three-sensor induction heating power process,which has three segments and joint-induction coil heating.We establish a mathematical model and identification method based on key parameters,such as frequency,pow-er,and heating time in aluminum.We also studied the coupling problem by analyzing the heating equivalent circuit for a three-sensor power supply,which obtains the same phase of a three-section multi-sensor output current as the key to power decoupling.Using this theory,we developed a simulation model and prototype, and the simulation results show that using the recursive least squares parameter estimation algorithm will result in a good identification model.This system reaches the allowable error limit when the frequency and heating power have reached 300 and 1 000 recurrence times,respectively.Prototype experimental results show that this method effectively eliminates power coupling between segments of the induction coil,and that accurate gradient heating and power control of irregularly shaped metals can be achieved.