DQ-Sensor-Less Control Implementation on a Multi-Phase High-Speed Direct Drive Motor

Inhalt:
Modern motor drives require advanced control techniques in order to achieve the desired high-level performance. In particular, precise knowledge of position and speed is crucial especially at high rotational speed. In this work, a sensor-less control technique for a high-speed multi-phase axial flux motor is developed. For this purpose, a field-oriented control is designed. This is done through a cascaded control structure with an inner current loop and an outer speed loop. The back-EMF of the motor is estimated using a model-based control method. For this purpose, a full-order sliding mode flux observer is designed. For the rotor speed and angle estimation an improved quadrature phase-locked loop is used. The system with the designed controllers is implemented in Matlab/Simulink. For a realistic simulation all relevant parameters of the circuit, ADCs, data acquisition and calculation are considered. Furthermore, the controllers are implemented on an automotive microcontroller and the simulations are evaluated and compared with measurements on the real system. Evaluation of the measurement results shows a very robust behavior over a wide speed range.