Design, Analysis, and Application of Wireless Motor Drives


Student thesis: Doctoral Thesis

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Award date22 Nov 2021


Wireless power transfer (WPT) technology is an innovative technology that can change the lives of people all over the world. In the past few decades, this technology become more and more mature. Related products such as wireless charging boards for mobile phones and wireless chargers for electric vehicles have been put on the market in large numbers. However, until now, the application of this technology is still limited, because many potential applications only need the wireless power transfer technology optimized according to their characteristics.

Thus, in recent years, many researches of wireless power transfer technology have begun to focus on some special subdivided applications, such as wireless power transfer systems for underwater equipment, wireless power transfer systems for dynamic mobile equipment, etc. Among them, the wireless motor drive is a very important application. Because motors are widely used in industrial and civil fields. If motors can be driven wirelessly, applications that use motors as the actuator will become more flexible and reliable. However, because the wireless machine drive is a technology that highly integrates wireless power transfer technology, motor drive technology and motor design technology, its development is also extremely difficult.

In this thesis, the wireless motor drive technology based on one-to-multiple wireless power transfer technology is in-depth analyzed and studied.

Firstly, in Chapter 3, the multi-frequency wireless power transfer technology is explored, that is, the same transmitter transfers power to different receivers simultaneously. In the proposed new one-to-multiple wireless power transfer system, inverters connected in series can simultaneously inject power of different frequencies into the same resonant circuit, and then wirelessly charge receivers of different natural resonant frequencies. Since this technology is the basis of wireless motor drives proposed in this thesis, its characteristics are thoroughly analyzed. Furthermore, to further improve its practicality, the soft switching of the entire system is realized, and the corresponding parameter design method is also given.

Secondly, in Chapter 4, a wireless motor drive for the single-phase induction motor is proposed and analyzed. This type of wireless motor drive is composed by an inverter, resonant circuits of the transmitter and the receiver, a low-frequency converter, and a control signals extraction circuit. The main advantages of this wireless motor drive are that its circuit is simple, the driven motor can be completely controlled from the transmitting side, and the ideal sine drive voltage can be output. After introducing its system configuration and its characteristics, a mathematical model of this wireless motor drive is established, and the power components of each stage of energy transmission are analyzed in depth. In addition, a system designed method is also given based on the analysis results.

Thirdly, in Chapter 5, a novel wireless inductive motor drive for the dual stator-winding SPIM (DSW-SPIM) is proposed. The characteristic of the new wireless motor driver is that there is no active power electronics on the receiving side. Only two receivers and two passive rectifiers on receiving side are sufficient to drive the DSW-SPIM. There is no need for the receiving-side inverter, control circuit, signal extraction circuit or communication module in existing wireless motor drives. After introducing its characteristics, the design method of DSW-SPIM is given, and its performance is simulated. Then, based on the simulation results, the mathematical model of the proposed wireless motor drive is established. And, its performances are analyzed based on the mathematical model. At the end of this chapter, a system designed method is also given based on the analysis process.

Fourthly, a wireless servo system of the three-phase six-stator-winding BLDC motor is proposed in Chapter 6. This system also has the characteristic of not having any active electronic device on receiving side. By only using diode on the receiving side, the TPSW-BLDC motor can be fully controlled from the transmitting side without the need of using communication circuit to wirelessly transmit control signals. Then, based on the proposed equivalent drive principle, the six-vector commutation algorithm and FOC algorithm are successfully applied to control the wireless servo system.