1. Permanent magnet synchronous motor
Inverter air conditioners have been rapidly developed due to their energy saving, more stable indoor temperature, low noise and higher comfort. It has become an industry consensus in the future development trend of air conditioners.
Inverter air conditioner generally refers to the inverter control of air conditioner compressor and its fan, and the scheme of vector control of permanent magnet synchronous motor is adopted. At present, most of the air-conditioning fans are fixed-frequency fans using single-phase AC motors. This single-phase AC fan can work with single-phase AC power supply. It has the advantages of simple structure and reliability, but it can not be compared with stepless speed regulation and fan efficiency. Low disadvantages. In order to further improve the performance of the inverter air conditioner, the existing air conditioner manufacturers have begun to control the frequency conversion of the air conditioner fan, realizing the full frequency conversion control of the air conditioner.
Permanent magnet synchronous motor (PMSM), high power density, small size, simple structure, vector control (FOC), fast dynamic response, high efficiency, low noise, safe and reliable, suitable for air conditioning fans, air conditioning The frequency conversion control of the fan, the following describes a scheme of the application of the vector control of the permanent magnet synchronous motor in the variable frequency control fan.
2. system structure
This inverter air conditioner fan solution uses STMicroelectronics' STM32 (ARM: Cortex-M3) MCU platform, and the permanent magnet synchronous motor (PMSM) vector control (FOC) scheme uses single-resistance (Single Shunt) current detection and position sensorless (Sensor) -less) Speed ​​position detection is implemented.
The system structure is shown in Figure 1. The MCU selects STM32F103C6T6; the power module driver uses three L6390Ds. Each L6390D has built-in op amp, comparator and intelligent shutdown protection circuit. The op amp can be used to amplify the sampling current, comparator and The intelligent shutdown protection circuit can be used to achieve motor overcurrent protection; the IGBT is 6 STGDL6NC60D.
The L6390D's built-in intelligent shutdown function enables overcurrent protection circuit (OCP), plus overvoltage (OVP) and undervoltage (LVP) protection functions to make the system safe and reliable.
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