Title Page
Abstract
Contents
Nomenclatures 16
Preface 17
Chapter 1. Introduction 18
1.1. Background 18
1.2. Thesis Outline 20
Chapter 2. Theory of the wireless power transfer 21
2.1. Introduction of the wireless power transfer technology 21
2.2. An inductive wireless power transfer system 22
2.3. A capacitive wireless power transfer system 22
2.4. Compensation Circuit Based Topology 24
2.4.1. A Power Amplifier (PA) Based Topology of a CWPT System 24
2.4.2. A Full-Bridge Inverter Based Topology of a C-WPT System 26
Chapter 3. An inductive of the WPT system 33
3.1. Design of inductive of the WPT system 33
3.1.1. The circuit schematic of the I-WPT system 33
3.1.2. A configuring of the coils for the I-WPT system design on the rotating shaft. 34
3.2. Fabrication of the I-WPT system 36
3.3. Measurements of the I-WPT system 38
3.3.1. The experimental measurement of voltage and charging distance 38
3.3.2. Optimize the number of transmitter and receiver coils of the I-WPT system 40
Chapter 4. A capacitive of the WPT systems 47
4.1. Design of capacitive WPT system 47
4.1.1. Design of converter 47
4.1.2. Design of rotating capacitors 53
4.2. Fabrication of the C-WPT system 59
4.3. Measurements of the C-WPT system 61
Chapter 5. Wireless sensor system for the WPT system 66
5.1. Design of wireless sensor system 66
5.1.1. Introduction of the architecture of the WSS 66
5.1.2. Design of wireless sensor system 66
5.2. Fabrication of WSS with a WPT 68
5.3. Measurements of the WSS 69
Chapter 6. Conclusions 77
References 79
Table 1. The LCLC and transformer designed parameters 49
Table 2. Analysis power requirement of each microcontroller and sensor. 67
Figure 1. The general structure of a WPT system 21
Figure 2. The general structure of the I-WPT system 22
Figure 3. The typical structure of the C-WPT system 23
Figure 4. A CWPT system based on a class E amplified circuit. 25
Figure 5. CPT system based on a full-bridge inverter with series inductors. 27
Figure 6. A full-bridge inverter with double-side LC compensation circuit for a C-WPT system. 29
Figure 7. A C-WPT system based on full-bridge inverter with double-sided LCL compensation circuit. 30
Figure 8. Circuit-based on the full-bridge inverter of a C-WPT system with a double-sided LCLC... 32
Figure 9. Schematic of transmitter and receiver circuit module for I-WPT system. 33
Figure 10. Coil arrangements on the rotating shaft and the fixture. 34
Figure 11. Design of ring-type fixture 35
Figure 12. The fabricated (a) fixture support using a 3D printer and Rx coil arrangement. 36
Figure 13. Experiment setup for WPT system on small test shaft architecture. 37
Figure 14. Output voltage characteristics monitoring of received module for the WPT system on a... 38
Figure 15. Output voltage characteristics in the Rx module of the I-WPT system as function of gap... 39
Figure 16. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 40
Figure 17. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 41
Figure 18. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 42
Figure 19. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 43
Figure 20. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 44
Figure 21. Output voltage characteristics of the I-WPT system on a rotating shaft when changing the... 44
Figure 22. Efficiency characteristics under the condition of the output power and efficiency at different... 45
Figure 23. Coil positions on the rotating propulsive shaft and the fixture when the optimal experiment... 46
Figure 24. A proposed design of the double-side LCLC compensated topology combining transformers. 48
Figure 25. The simulated circuit. 49
Figure 26. The gate waveform of the MOSFET-bridge and the output of the MOSFET-bridge (VP3) 50
Figure 27. The primary and secondary voltage of the set-up (a) and step-down (b) transformers. 52
Figure 28. The output voltage and current of the load before the rectifier. 52
Figure 29. The design case of a capacitor forms in two (a), four (b) and five (c) plates. 54
Figure 30. The capacitor design for simulation. 54
Figure 31. The result of the capacitive simulation with the S11-parameter. 55
Figure 32. The simulated capacitance value. 55
Figure 33. The effect of radius of plate with the effective capacitance. 56
Figure 34. The effect of distance between two plates with the effective capacitance. 57
Figure 35. The design of (a) rotary disk, (b) stationary disk, (c) inner-fixture, (d) outer-fixture. 57
Figure 36. The (a) assembler and (b) disassembler of the rotating capacitor. 58
Figure 37. The fabrication of (a) stationary and (b) rotary disk. 59
Figure 38. The overall of LCLC and transformers circuit. 60
Figure 39. The experimental waveform of the gate signal of the MOSFET-bridge 62
Figure 40. The experimental waveform of the output voltage of the MOSFET-bridge. 62
Figure 41. The experimental waveform for the primary voltage of the step-up transformer TI1 63
Figure 42. Secondary voltage of the step-up transformer TI1. 63
Figure 43. Primary voltage of the step-down transformer TI2 64
Figure 44. Secondary voltage of the step-down transformer TI2 64
Figure 45. Output voltage. 65
Figure 46. A block diagram for WSS system on small scale test shaft. 67
Figure 47. Arduino, sensors and XBEE configuration. 68
Figure 48. Experiment setup for sensor system with (a) I-WPT, (c) C-WPT of the Rx side and (b) the... 69
Figure 49. Test result of the Tx (a) and Rx (b) side of the WSS. 70
Figure 50. The test position of the temperature sensor of the frame (a) and near bearing (b). 71
Figure 51. The temperature change of the frame of motor during operation. 71
Figure 52. The temperature change of the near bearing during operation 72
Figure 53. Data sent to the computer via XBEE. 73
Figure 54. The experimental setup of the strain gauge sensor at the horizontal position. 74
Figure 55. The quarter-bridge output voltage. 74
Figure 56. The output voltage (a) and strain (b) of the Wheatstone bridge. 76