Research on Synchronous Transmission Technology of Wireless Energy and Harmonic Modulated Wireless Drive Signal for Motor

With the development and construction of urban sewerage systems and underground pipelines, it's very important to realize the power supply and control of in-pipe motors, which can be used for pipeline robots or to discharge floodwater. This paper proposes a harmonic modulated wireless energy and drive signal synchronous transmission technology for the motor in pipelines. The transmitter (Tx) side inverter of the Wireless Power Transfer (WPT) system is used to modulate the second and third harmonic energy, and the corresponding harmonic energy is extracted from the secondary side as a harmonic drive signal to drive the motor inverter directly, thus realizing the direct drive control of the motor on the Tx side. This technology, which eliminates the additional bidirectional communication control module, motor inverter drive circuit, and auxiliary power supply, realizes the power supply and control of the in-pipe motor. By analyzing the modulation and transmission of the second and third harmonic energy, the corresponding modulation and extraction methods of harmonics are given. A 110W prototype is built for experimental verification and the experimental results indicate that the second and third harmonic energy can effectively drive the motor inverter.