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AN2281 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2281 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 38 page  March 2006 Rev 1 1/38 AN2281 Application note Low cost self-synchronizing PMAC motor drive using ST7FLITE35 Introduction Due to their high efficiency, power by size ratio and silent operation, Permanent Magnet AC (PMAC) motors are increasingly used in many applications. They are becoming the predominant type of motor used in applications where the above advantages are required, especially fans, compressors and pumps. Since PMAC motors are synchronous machines, to get the best efficiency from them, the excitation must be switched from one motor phase to another in exact synchronism with the rotor motion. This concept, commonly known as self-synchronization, uses direct feedback of the rotor angular position to ensure that the PMAC machine never loses synchronization. This application note describes a low-voltage single-sensor three-phase AC permanent magnet motor, also known as PMAC or BLAC (brushless AC) control system. It includes a depiction of: ● Reference schematics, which can be used for up to 12V-50W PMAC motors and based on ST7LITE35 microcontroller and on STS8C5H30L complementary P-channel and N- channel MOSFETs, ● Firmware library, developed with the Cosmic C compiler and STVD7 release 3.x.x. It is composed of several C modules containing a set of convenient functions for sinusoidal waveform generation, synchronization mechanism and closed loop control of PMAC motors. www.st.com |
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