Embedded Systems Design - March 2008 - (Page 16) 0308esd.p16to25 2/14/08 3:50 PM Page 16 cover feature Designing BY BYRON MILLER DSP-based V ariable-speed drive (VSD) motors provide hope for greatly reducing energy consumption and reliance on foreign fuels. In one approach, digital signal processors (DSPs) are being used to create a new generation of VSD-based controllers for motors such as brushless direct current (BLDC) motors. However, these motors present challenges. Controlling motor speed on a BLDC motor is complicated when using traditional proportional, integral, and differential (PID) controllers because they rely on a complex mathematical model and are computationally intensive. An alternative approach is to use fuzzy logic (FL) algorithms to eliminate the need for complex math formulas and provide an easy-to-understand solution. FL motor control also has a shorter development cycle compared to PID controllers, and thus a faster time-to-market. This article discusses the process of using FL algorithms to control BLDC motors using a Texas Instruments c28xx fixed-point family of DSPs. BLDC CONTROL MODEL DEVELOPMENT Before constructing the FL engine, we must first develop a model to base the design on. FL controllers use heuristic knowledge and express the design using a linguistic description of the model. Rather than develop a model from scratch, we’ll use the PID controller model as a starting point. Once developed and implemented, the FL controller is improved by adjusting its parameters. In general, there are three design steps for developing a FL BLDC controller: 16 MARCH 2008 | embedded systems design | www.embedded.com http://www.embedded.com
Table of Contents Feed for the Digital Edition of Embedded Systems Design - March 2008 Embedded Systems Design - March 2008 Contents #Include Programming Pointers Designing DSP-based Motor Control Using Fuzzy Logic Hardware/Software Verification Enters the Atomic Age Efficient CRC Calculation with Minimal Memory Footprint Programming Your Own Microcontroller Advertising Index Break Points Marketplace Embedded Systems Design - March 2008 Embedded Systems Design - March 2008 - (Page BB1) Embedded Systems Design - March 2008 - (Page BB2) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page Cover1) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page Cover2) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page 1) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page 2) Embedded Systems Design - March 2008 - Contents (Page 3) Embedded Systems Design - March 2008 - #Include (Page 4) Embedded Systems Design - March 2008 - #Include (Page 5) Embedded Systems Design - March 2008 - #Include (Page 6) Embedded Systems Design - March 2008 - #Include (Page 7) Embedded Systems Design - March 2008 - #Include (Page 8) Embedded Systems Design - March 2008 - Programming Pointers (Page 9) Embedded Systems Design - March 2008 - Programming Pointers (Page 10) Embedded Systems Design - March 2008 - Programming Pointers (Page 11) Embedded Systems Design - March 2008 - Programming Pointers (Page 12) Embedded Systems Design - March 2008 - Programming Pointers (Page 13) Embedded Systems Design - March 2008 - Programming Pointers (Page 14) Embedded Systems Design - March 2008 - Programming Pointers (Page 15) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 16) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 17) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 18) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 19) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 20) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 21) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 22) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 23) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 24) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 25) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 26) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 27) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 28) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 29) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 30) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 31) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 32) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 33) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 34) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 35) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 36) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 37) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 38) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 39) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 40) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 41) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 42) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 43) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 44) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 45) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 46) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 47) Embedded Systems Design - March 2008 - Advertising Index (Page 48) Embedded Systems Design - March 2008 - Break Points (Page 49) Embedded Systems Design - March 2008 - Break Points (Page 50) Embedded Systems Design - March 2008 - Marketplace (Page 51) Embedded Systems Design - March 2008 - Marketplace (Page 52) Embedded Systems Design - March 2008 - Marketplace (Page Cover3) Embedded Systems Design - March 2008 - Marketplace (Page Cover4)
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