Rotor displacement identification method for bearingless permanent magnet slice motor in three-Hall fault state

• Main Authors: WANG SUO, LU ZHIYUAN, WANG YU
• Format: Patent
• Language: Chinese; English
• Published: 03.09.2024
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a rotor displacement identification method for a bearingless permanent magnet slice motor in a three-Hall fault state. The method comprises the following steps: firstly, deducing an output signal of a sensor when a Hall is not in a fault state; on the premise of a double-Hall fault, solving a rotor angle and a permanent magnet flux linkage coefficient when the rotor is not eccentric; when the three Hall elements fail, non-eccentric permanent magnet linkages of the three fault Hall elements are calculated, and three displacement calculation expressions are obtained by subtracting two times of the non-eccentric permanent magnet linkages of the symmetrical fault Hall elements from the three non-fault Hall elements; adding the three expressions to obtain the projection of the offset displacement at the 0 mechanical angle as an equation S1; the three displacement calculation expressions are multiplied by the vector amplitude perpendicular to the armature reaction vector and then added, and