srm motor
Application Report
SPRA420A - February 2000
Switched Reluctance Motor Control – Basic Operation and
Example Using the TMS320F240
Michael T. DiRenzo
Digital Signal Processing Solutions
ABSTRACT
This report describes the basic operation of switched reluctance motors (SRMs) and demonstrates how a TMS320F240 DSP-based SRM drive from Texas Instruments (TI™) can be used to achieve a wide variety of control objectives.
The first part of the report offers a detailed review of the operation and characteristics of
SRMs. The advantages and disadvantages of this type of motor are cited.
The second part of the report provides an example application of a four-quadrant, variable speed SRM drive system using a shaft position sensor. The example has complete hardware and software details for developing an SRM drive system using the TMS320F240. The SRM operation is described, along with the theoretical basis for designing the various control algorithms. The example can be used as a baseline design which can be easily modified to accommodate a specific application.
This report contains material previously released in the Texas Instruments application report
Developing an SRM Drive System Using the TMS320F240 (literature number SPRA420), and has been updated for inclusion in the Application Design Kit (ADK) for switched reluctance motors.
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Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Motor Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Torque-Speed Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Electromagnetic Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SPRA420A - February 2000
Switched Reluctance Motor Control – Basic Operation and
Example Using the TMS320F240
Michael T. DiRenzo
Digital Signal Processing Solutions
ABSTRACT
This report describes the basic operation of switched reluctance motors (SRMs) and demonstrates how a TMS320F240 DSP-based SRM drive from Texas Instruments (TI™) can be used to achieve a wide variety of control objectives.
The first part of the report offers a detailed review of the operation and characteristics of
SRMs. The advantages and disadvantages of this type of motor are cited.
The second part of the report provides an example application of a four-quadrant, variable speed SRM drive system using a shaft position sensor. The example has complete hardware and software details for developing an SRM drive system using the TMS320F240. The SRM operation is described, along with the theoretical basis for designing the various control algorithms. The example can be used as a baseline design which can be easily modified to accommodate a specific application.
This report contains material previously released in the Texas Instruments application report
Developing an SRM Drive System Using the TMS320F240 (literature number SPRA420), and has been updated for inclusion in the Application Design Kit (ADK) for switched reluctance motors.
1
2
3
4
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Motor Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Torque-Speed Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Electromagnetic Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
References: Anderson, B. and J. Moore, Optimal Filtering, Prentice-Hall Publishing, Englewood Cliffs, NJ, 1979. Clemente, S. and A. Dubhashi, “HV Floating MOS-Gate Driver IC,” International Rectifier application note AN–978A, International Rectifier, El Segundo, CA, 1990. Jan. 1987. Machines,” IEEE Trans. Industry Electronics, vol. 33, Nov. 1997. Lewis, F. Applied Optimal Control & Estimation, Prentice Hall Publishing, Englewood Cliffs, NJ, 1992. Miller , T. J. E. (ed.), “Switched Reluctance Motor Drives,” Intertec Communications Inc., Ventura, CA, 1988. Miller, T. J. E., “Switched Reluctance Motors and Their Control,” Magna Physics Publishing, Hillsboro, OH, and Oxford, 1993.