Quanzhou Ausenist Technology Co., Ltd AU620 Intelligent Water Pump Inverter: PMSM & Asynchronous Motor Compatibility
The core way that AU620 intelligent water pump inverter achieves compatibility between permanent magnet synchronous motors (PMSM) and asynchronous motors is by switching motor types through parameter configuration, supplemented by targeted control algorithms and parameter identification technology.
Technical Means for Compatibility
1. Key Parameter Toggle
The inverter has a dedicated motor type selection parameter. Users can switch between different motor types by modifying function code U3-32:
- Set to 0: Suitable for standard asynchronous motors.
- Set to 1: Suitable for permanent magnet synchronous motors (PMSM).
2. Targeted Motor Model Parameter Configuration
To ensure efficient operation of both motor types, AU620 allows users to input different rated parameters according to motor nameplates, and provides a specific electromagnetic parameter group for synchronous motors:
- General Basic Parameters: Including motor rated power (U3-33), rated speed (U3-34), rated voltage (U3-35), rated current (U3-36) and rated frequency (U3-37).
- Synchronous Motor-Specific Parameters: When synchronous motor is selected, the system enables deeper electromagnetic model parameters, such as back EMF coefficient (U3-48), stator resistance (U3-50), D-axis inductance (U3-51) and Q-axis inductance (U3-52).
3. Motor Auto-tuning Function
AU620 is equipped with motor parameter auto-tuning (U3-49) logic. By setting the auto-tuning mode (e.g., static identification or dynamic identification), the inverter can automatically detect the internal characteristics of the motor:
- The inverter sends specific pulses to the motor to identify key parameters such as resistance and inductance mentioned above.
- This ensures that whether it is a synchronous or asynchronous motor, the inverter can establish an accurate mathematical model to achieve precise vector control.
4. Advanced Control Algorithm Support
AU620 adopts different control modes to adapt to motor characteristics:
- Asynchronous Motor: Usually adopts V/F control or Sensorless Vector Control (SVC) to balance stability and starting torque for water pump applications.
- Synchronous Motor: Adopts synchronous motor vector control mode (corresponding to U3-32 set to 2 logic for some models), using high-precision current vector algorithm to accurately estimate the rotor position of permanent magnet motor, thus exerting its advantages of high efficiency and high power density.
Summary
AU620 achieves "one inverter for two motors", which not only reduces users' inventory costs, but also ensures the system achieves the best energy-saving effect when driving high-efficiency permanent magnet synchronous motors through built-in advanced algorithms.