| With high power density, high efficiency, loss of small, easy to control features, Permanent-magnet synchronous motor (PMSM for short) is gaining a wide range of applications in the robot, numerical control machine, electric vehicles, inverter air conditioner and other areas. At the same time the application trend has been accelerated by the miniaturization and low cost of embedded micro controller.First, the characteristics of PMSM were described, and a mathe-matical model of such motors was given. Then PMSM vector control system structure had been analyzed. Space vector pulse width modulation technology had also been described in detail.Second, for the frequency control requirements of sensorless interior permanent-magnet synchronous motor (IPMSM), such as inverter air-conditioner compressor, studied the speed and rotor position detection method about sensorless IPMSM. An observer based on sliding mode observer for IPMSM speed and rotor position detection had been designed. This observer first used the motor current module of SMO to observe the extended back-EMF, and then used speed parameter identification and rotor position angle phase-locked loop (PLL), respectively, to get motor speed and rotor position information, in order to reduce the value of speed and rotor position measurement error.Third, PMSM vector control hardware and software system had been designed and developed, which was based on the new embedded micro-controller chip STM32F103 of STMicroelectronics (ST). The theory and implementation methods of main function modules had been described in detail too.Finally, the system was successfully applied to the 80W IPMSM motor control. The result showed that the sensorless vector control system, with a reasonable structure, good steady-state accuracy and dynamic perfor- mance, could meet the actual application requirements. At last, the paper gave the results of this system been used in the 1.5P inverter air conditioner compressor driven system. |
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