Dynamic wireless power transfer (DWPT) has received extensive attention due to its advantages of high security, high convenience, and high efficiency. To solve the problems of the mutual inductance and output power drop of DWPT systems for inspection robots, a new DWPT system with a trapezoidal-rectangular coupler has been proposed. First, the DWPT system topology and the switching strategy of the transmitting coil are introduced. Second, the real-time mutual inductances of the coupler in linear and curved motion are derived. Third, a new trapezoidal transmitting coil is presented. Finally, the performance of the DWPT system with the trapezoidal-rectangular coupler (TRC) is tested and compared to the DWPT system with the rectangular-rectangular coupler (RRC). Experimental results show that the minimum mutual inductance of the TRC is increased by 58.71%, and that the minimum output power is more than doubled in curved motion. Moreover, the mutual inductance drop rates of the TRC in linear and curved motion are reduced by 21.23% and 18.42%, respectively. The output power drop rates of the TRC-DWPT system are reduced by 18.99% and 16.12%, respectively. In addition, the Litz wire consumption is reduced by 8.28% in linear motion.

动态无线电力传输（DWPT）由于具有高安全性、高便利性和高效率等优点而受到广泛关注。为解决检测机器人DWPT系统的互感和输出功率下降问题，提出了一种梯形-矩形耦合器的新型DWPT系统。首先介绍了DWPT系统拓扑结构和发射线圈的切换策略。其次，导出了耦合器在线性和曲线运动中的实时互感。第三，提出了一种新的梯形发射线圈。最后，测试了带有梯形-矩形耦合器（TRC）的DWPT系统的性能，并与带有矩形-矩形耦合器（RRC）的DWPT系统进行了比较。实验结果表明，TRC的最小互感增加了58.71%，曲线运动时最小输出功率增加了一倍以上。此外，TRC在直线运动和曲线运动中的互感下降率分别降低了21.23%和18.42%。TRC-DWPT系统的输出功率下降率分别降低了18.99%和16.12%。此外，直线运动中的利兹线消耗降低了8.28%。