Dual three-phase permanent magnet synchronous motor system and angle compensation method and device thereof

Abstract

This invention discloses a dual three-phase permanent magnet synchronous motor system and its angle compensation method and device. The method includes: acquiring the phase currents of the two sets of windings of the dual three-phase permanent magnet synchronous motor and the rotor position angle of the first set of windings; generating a compensated rotor position angle for the first set of windings through closed-loop control using a phase-locked loop (PLL); obtaining the compensated rotor position angle for the second set of windings based on the relationship between the rotor position angles of the first and second sets of windings; controlling the first three-phase subsystem using three-phase motor coordinate transformation based on the phase current of the first set of windings and the compensated rotor position angle; and controlling the second three-phase subsystem using three-phase motor coordinate transformation based on the phase current of the second set of windings and the compensated rotor position angle. This invention uses a PLL to compensate for the angle of the position sensor's output signal, which can reduce system losses and has a wide range of applications and low cost.

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