Fault-Tolerant Control of Arbitrary Two-Phase Open Circuit in Permanent Magnet Bearingless Slice Motors Based on Reverse Magnetic Potential Elimination
Wang Suo, Wang Yu
College of Automation Engineering Nanjing University of Aeronautics &Astronautics Nanjing 210016 China
Abstract：In the case of two-phase circuit breakage of the suspended winding during the operation of the bearingless slice motor, most existing fault-tolerant compensation schemes solve the reconstruction current with power optimization as the constraint condition. However, the influence of the reverse magnetic potential on the suspension force is ignored, which results in an increase in the pulsation of the motor suspension force and a decrease in the suspension performance after fault-tolerant operation. At the same time, it is also impossible to perform fault-tolerant control on the two-phase circuit break situation separated by one phase under the six-teeth motor. This paper proposes a fault-tolerant compensation scheme for two-phase circuit breakage of a single-winding bearingless slice motor. During current reconstruction, based on the eliminating principle of the reverse magnetic vector, a four-compatible fault current is constructed that corresponds to the mutual offset of the reverse magnetic vector by 180°, generating a stable suspension force. Accordingly, the same suspension performance of the six-teeth bearingless slice motor before and after any two compatible faults is achieved. Finally, taking a six-phase single-winding bearingless slice motor as an example, a two-phase fault tolerance experiment is conducted. Among them, B, D, E, and F are the phases of the four-phase currents. The two sets of reverse magnetic potentials are equivalent to two sets of reverse magnetic vectors, and the required four-phase currents can be solved through vector superposition. Equation (4) shows the four-compatible fault current obtained by reconstructing the residual phase current, and Fig.A1 shows the specific derivation process. The proposed fault-tolerant algorithm can maintain the thin film with the same suspension performance when any two-phase circuit fault occurs. The rotor suspension is stable without shaking after rotation, and the maximum radial displacement is kept within 25 μm. (1) The three types of two-phase open circuit situations, adjacent, separated, and relative, differ only in the generated reverse magnetic potential. No essential difference exists in three-phase open-circuit situations using the proposed algorithm to cancel the reverse magnetic potential. (2) The floating force pulsation is mainly caused by the reversal magnetic potential that cannot be canceled out due to three-phase asymmetry after a circuit break fault in the floating winding. (3) The fault-tolerant operation can be achieved using the proposed fault-tolerant algorithm on a single-winding six-teeth thin film motor after any two-phase circuit break, and the suspension performance is almost consistent with normal operations.
王锁, 王宇. 基于反转磁动势消除的永磁薄片电机任意两相断路容错控制[J]. 电工技术学报, 2025, 40(16): 5271-5282.
Wang Suo, Wang Yu. Fault-Tolerant Control of Arbitrary Two-Phase Open Circuit in Permanent Magnet Bearingless Slice Motors Based on Reverse Magnetic Potential Elimination. Transactions of China Electrotechnical Society, 2025, 40(16): 5271-5282.
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