Discussion on the Decoupling Control Strategy of Permanent Magnet Type Bearingless Motors

Source: Bearing Network | Date: January 16, 2013

The controllable suspension force in a permanent magnet type bearingless motor is generated by the combined effect of the magnetic fields from the torque winding and the floating winding, along with the rotor's permanent magnet and the current flowing through the torque winding. In rotor field-oriented control, the motorâ€™s idle running torque is managed effectively. The air gap magnetic field produced by the rotor's permanent magnet alone forms the basis for the torque windingâ€™s magnetic field. This means that the magnetic field generated by the torque winding is essentially the same as the rotorâ€™s field. When the amplitude of the air gap magnetic field is stabilized, and the real axis of the common coordinate system is aligned with the direction of the air gap magnetic field, the suspension force model in this coordinate system will follow the same equation. This concept serves as the foundation for decoupling control strategies based on directional control of the torque winding's air gap magnetic field. Traditional decoupling control strategies for permanent magnet type bearingless motors rely on rotor field orientation. However, these methods often face challenges due to high nonlinearity between the suspension force, clutter, and control current, limiting their effectiveness in high-speed applications. This paper explores an alternative approach by focusing on the suspension force generation mechanism of permanent magnet type bearingless motors. By aligning the external permanent magnet type bearingless motor with torque winding air gap field directional control, we derive a dq-axis mathematical model that leads to the development of a torque winding air gap magnetic field orientation coordinate system. Using the motorâ€™s suspension force, air gap flux linkage, and torque equations, we build an air gap magnetic field orientation control system. This method addresses the limitations of traditional rotor field-oriented control and improves overall performance. Simulation results demonstrate that the motor achieves effective decoupling between torque and suspension force, while also exhibiting excellent dynamic and static characteristics. These findings confirm the feasibility and practicality of the proposed control strategy.

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