Chapter 8 Conclusions
8.2 Future Works
By the trend of function-type scheme requirement in product development and energy saving issue all over the world, more efforts should be involved in the electronic motor drives, which may affect more than close 50% or more energy usage in our daily life and industrial applications, is deemed to be a important job. Control strategy research is a driving force to do that job.
However, the approach owns merely one focus point for enhancing the energy using is difficult to obtain acceptance under commercial considerations. No doubt, some auxiliary functions and structures that can make the SRM drive under development phase within more operation and design capabilities for the overall drive scheme are expected and needed.
Hence, in this section, the final part of this dissertation, some opinions for the future research will be brought up not simply limit to the single efficiency topic but include some issues of drives’ development for SRM in this status.
Based on author’s knowledge and experience during this research, all future work is summarized schematically in the following ideas for providing reference to the engineers working in the related fields and researchers within this interesting area:
1)To design the scheme, not only for efficiency improvement, but also for reducing EMI from the main fundamental voltage driving profile which may be helpful to pass the important verification and testing to SRM drives under product phase.
2)Integrated-chip (IC) realization for optimizing efficiency control is the most important work in the near future to enhance the applicability both for industrial practice and home appliance products. The concept of this proposed methodology that can be integrated into the development of the SRM drive is another discussion issue and should be investigated and developed further.
Chapter 8 Conclusions
3)Overall four-quadrant operation mechanism for the optimizing efficiency control that can extend the usage of this approach from motoring to generating, and both of them in bi-direction operation is required for most applications.
4)Performance index that may help the operational performance judgment is needed such as the applied torque range, specified in 4.5.2, should just be one deployed opinion to affect the operation of the efficiency optimizing. For instance, a current-based analysis index that related to the torque is given as follows [30]:
Torque evaluation index obtained by the current difference between the command value and actual value, implying the deviation degree of outputted torque to the desired value, while the torque-current relation has been well established for the developed SRM drive and can be expressed in the form of
∑
−= ( commandx x)2
evaluation I i
T (8-1) where Tevaluation, Ixcommand, and ix denote torque evaluation index based on the current difference, current command for phase symbol x, and actual current for phase symbol x, respectively.
5)A product-type platform that being setup for the verification under its counterpart having been adjoined, which is greatly useful to consider the selection of components and the related settings of the drives such as circuit elements, data sampling assignment, life-cycle verification, and so forth, should be designed and integrated.
6)Performance enhancement based on parameter computation mechanism that focuses on realization of module-like functions is needed.
7)Efficiency regulation capability for multiphase excitation SRM drives and the relevant parameter estimation approaches is expected.
8)Well-chosen optimizing step size for efficiency improvement is
Chapter 8 Conclusions
general-purpose usage both based on energy balancing of the operation system.
Chapter 8 Conclusions
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Chapter 8 Conclusions
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Chapter 8 Conclusions
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Chapter 8 Conclusions
Appendix A-Applied Switched Reluctance Motor Information
Table A-1: The parameters’ information of the two SRMs.
Specifications SRM 1 SRM 2
Rated power[hp] 3 1/2
Pole pair number 8/6 12/8
Rated voltage[Vrms] 48 120
Phase number 4 3
Aligned
inductance[mH] 0.5382 39.8
Unaligned
inductance[mH] 0.0652 5.2
Phase resistance
[Ω] 0.0095 2.4
Rated speed
[r/min] 6000 950
Chapter 8 Conclusions
Appendix B-Mechanical Parameters
The related parameters is measured by the dynamometer platform based on the Eq.(B-1), express as:
) 1 (
r m l e m
r T T B W
J dt
dW = − − (B-1)
where Te, Tl, Bm, Wr, Jm, and t mean the outputted torque of the drive, loading torque, viscous coefficient, motor speed, rotor moment of inertia, and time, respectively.
Those are given as Table B-1:
Table B-1: The mechanical parameters of the applied SRMs.
SRM 1 SRM 2
0.1023 N.m2 (Jm)
0.0152 N.m2 (Jm) 0.00009 N.m.sec/rad
(Bm)
0.000017 N.m.sec/rad (Bm)
Chapter 8 Conclusions
Appendix C- Patent Information of Japan
Table C-1: Patent collection that related to SRM concept (till May 2003)
No. Publication No. Title
1. 2003 - 299383 Method and device of controlling switched reluctance motor 2. 2003 - 244873 Stator core for motor of superior noise characteristics
3. 2003 - 243214 Non-grain oriented electrical steel sheet for motor iron core and its manufacturing method 4. 2003 - 204660 Switched reluctance motor
5. 2003 - 189669 Rotor position detection for switched reluctance drive apparatus 6. 2003 - 111488 Method and apparatus of controlling switched reluctance motor and compressor 7. 2003 - 088157 Motor controller
8. 2003 - 061381 Driving method of switched reluctance motor 9. 2003 - 032979 Switched reluctance motor
10. 2003 - 018890 Control method for switch reluctance driving system 11. 2002 - 369580 Drive circuit of switched reluctance motor
12. 2002 - 369568 Excitation of switched reluctance motor
13. 2002 - 354881 Operation control method of switched reluctance motor 14. 2002 - 354867 Control method for switched reluctance motor
15. 2002 - 300755 Switched reluctance motor 16. 2002 - 291212 Switching reluctance motor
17. 2002 - 272176 Switched reluctance motor, its control method and apparatus, and program thereof 18. 2002 - 272071 Switched reluctance motor
19. 2002 - 253896 Washing machine equipped with switched reluctance motor 20. 2002 - 247888 Torque ripple reduction method for motor
21. 2002 - 242872 Rotary compressor
22. 2002 - 238276 Switched reluctance motor, method for controlling the same and its positional angle deciding mechanism as well as inverter and program 23. 2002 - 226952 Nonoriented silicon steel sheet for iron core of motor and production method therefor 24. 2002 - 218791 Method and system for deciding rotor position in changeover-type reluctance machine 25. 2002 - 199784 Current chopping in switched reluctance drive system
26. 2002 - 199783 Operation method for switched reluctance drive operated from dual-voltage source 27. 2002 - 199769 Drive method for switched reluctance motor
28. 2002 - 186283 Switched reluctance motor and its drive circuit without sensor 29. 2002 - 168166 Magnet switch for starter
30. 2002 - 136073 Switched reluctance motor
31. 2002 - 124716 Magnetoresistance element and memory element using the element 32. 2002 - 119086 Device and method for controlling electric machine
33. 2002 - 058287 Holding circuit of reluctance apparatus and operating circuit of electric hoist using that holding circuit 34. 2002 - 058272 Method and apparatus for controlling switched reluctance motor 35. 2002 - 034300 Control circuit of SR generator
36. 2002 - 010661 Method for aligning rotor of switched-reluctance motor and driving
Chapter 8 Conclusions
38. 2002 - 010593 Switched reluctance motor
39. 2001 - 309691 Switched reluctance motor and its sensorless drive circuit 40. 2001 - 309622 Switched-reluctance motor
41. 2001 - 298983 Detection of position of switching reluctance machine 42. 2001 - 292560 Eddy current reducer
43. 2001 - 286172 Single phase SRM (switched reluctance motor) drive unit and its method 44. 2001 - 268961 Method and apparatus for controlling switched reluctance motor 45. 2001 - 268868 Switched reluctance motor
46. 2001 - 258283 Inverter system for driving electric vehicle 47. 2001 - 197777 Brushless machine control
48. 2001 - 197776 Brushless machine control
49. 2001 - 197775 Monitoring of rotor position of reluctance driving device 50. 2001 - 190049 Self-excited reluctance motor
51. 2001 - 186797 Drive circuit for switched reluctance motor and compressor 52. 2001 - 186693 Switched reluctance motor
53. 2001 - 157387 Switched reluctance motor
54. 2001 - 128490 Switched reluctance motor and rotation-control device
55. 2001 - 128477 Control method for switched reluctance motor, driving method for compressor, and apparatus thereof 56. 2001 - 103787 Switched reluctance motor and rotation controller therefor
57. 2001 - 090670 Hydraulic device 58. 2001 - 090668 Hydraulic device
59. 2001 - 086729 Switched reluctance linear motor 60. 2001 - 080375 Automobile driving system
61. 2001 - 078490 Control method for sr motor, and the sr motor 62. 2001 - 065420 Forcibly feeding unit for fuel
63. 2001 - 057791 Control method and control device of switched reluctance motor 64. 2001 - 045689 Coil for switching reluctance machine
65. 2001 - 025286 Sr motor
66. 2001 - 025280 Active reduction of torque mismatching for rotary machine
67. 2001 - 014622 Alternating magnetic field generating circuit and evaluation device of magnetoresistance head 68. 2001 - 008435 Switched reluctance motor and load transfer device
69. 2001 - 008434 Switched reluctance motor and load transfer device 70. 2000 - 358395 Control of line harmonic
71. 2000 - 350390 Switched reluctance motor
72. 2000 - 341901 Method for improving bearing strength of switched reluctance motor 73. 2000 - 324887 Reluctance polyphase motor
74. 2000 - 324886 Reluctance motor
75. 2000 - 324869 Reluctance type multiphase motor 76. 2000 - 320466 Servo motor driven type hydraulic pump
77. 2000 - 315305 Magnetic reproducing head, magnetic head assembly, magnetic disk driving device and manufacture of magnetic head assembly 78. 2000 - 312500 Method and device for controlling switched reluctance motor 79. 2000 - 312494 Operation of switched reluctance machine by dual supply voltage 80. 2000 - 299996 Reluctance motor drive controller
81. 2000 - 299517 Magnetoresistance element and magnetic memory element
82. 2000 - 295891 Inverter device for switched reluctance motor and its control method 83. 2000 - 294855 Magnetoresistive element
84. 2000 - 287480 Control method of brushless motor 85. 2000 - 262037 Switched reluctance linear motor
Chapter 8 Conclusions
86. 2000 - 245186 Switching control for reluctance machine 87. 2000 - 237492 Washing machine
88. 2000 - 224888 Rotor position detection in changeover reluctance machine 89. 2000 - 224877 Speed controlling method of switched reluctance motor 90. 2000 - 217394 Stepping motor
91. 2000 - 209894 Stator winding structure of switched reluctance motor 92. 2000 - 197383 Control of reluctance machine to be switched
93. 2000 - 197338 SR motor, SR linear motor, and cargo transfer device 94. 2000 - 189376 Dish washing and drying machine
95. 2000 - 175383 Stator for switched reluctance motor
96. 2000 - 166292 Switched reluctance motor and its driving circuit 97. 2000 - 125585 Reluctance type motor
98. 2000 - 116183 Drive for switched reluctance motor
99. 2000 - 116180 Controller for chopping power application to electric motor 100. 2000 - 102276 Rotor position detector and detecting method therefor, and rotor
position detector, and detecting method for sensorless switched reluctance motor
101. 2000 - 078884 Changeover type reluctance driving device having high power factor 102. 2000 - 078883 Current conduction controller for electric motor
103. 2000 - 069780 Multiphase reluctance motor
104. 2000 - 069779 Matching method for rotating angle sensor of switched reluctance motor 105. 2000 - 060089 Switched reluctance motor
106. 2000 - 050587 Switched reluctance motor
107. 2000 - 033061 Cleaner with soft starting function and its method 108. 11 - 356085(1999) Short circuit detector for coil of electric motor 109. 11 - 356080(1999) Sr motor
110. 11 - 356079(1999) Sr motor, and electric power steering device using the same 111. 11 - 356018(1999) Switched reluctance motor
112. 11 - 346494(1999) Conduction controller for electric motor 113. 11 - 346464(1999) Operation of changeover reluctance machine 114. 11 - 346463(1999) Laminate for switching reluctance machine 115. 11 - 341875(1999) Drive circuit of switched reluctance motor 116. 11 - 332189(1999) Switched reluctance motor
117. 11 - 308828(1999) Switched reluctance motor and its control method 118. 11 - 307353(1999) High efficiency reluctance motor
119. 11 - 275891(1999) Control method for switched reluctance motor and its device 120. 11 - 275890(1999) Drive circuit for sensorless switched reluctance motor
121. 11 - 262290(1999) Rotor position detecting equipment of sensorless switched reluctance motor and its method 122. 11 - 262225(1999) Reduction of noise in reluctance machine
123. 11 - 252971(1999) Rectification control device
124. 11 - 235083(1999) Rotor position detection device of sensorless switched-reluctance motor and method thereof 125. 11 - 206181(1999) Device and method for detecting rotor position of sensorless switched reluctance motor
124. 11 - 235083(1999) Rotor position detection device of sensorless switched-reluctance motor and method thereof 125. 11 - 206181(1999) Device and method for detecting rotor position of sensorless switched reluctance motor