Slotless skew winding axial active suspension bearingless motor and control method

Abstract

The invention discloses a slotless skew winding axial active suspension bearingless motor, and belongs to the field of motor manufacture. The slotless skew winding axial active suspension bearingless motor comprises a shell, a rotor, an upper stator, a lower stator, a non-magnetic rotating shaft, a rotor position sensor and an axial displacement sensor, radial driven magnetic bearings are mounted at two ends of the non-magnetic rotating shaft respectively, the upper stator and the lower stator respectively comprise a slotless stator yoke and an axial skew annular winding, skew direction angles of the windings of the upper stator and the lower stator are axially symmetric about the motor, three-phase inverters are connected onto the windings of the upper stator and the lower stator respectively and connected with a controller, and the rotor position sensor and the axial displacement sensor are connected with the controller. The stators are of slotless structures, motor slot effects are eliminated, axial suspension and rotation of the rotor are controlled in a decoupled manner by adjusting given current of the windings of the upper stator and the lower stator, and the problem of permanent magnet demagnetization caused by controlling axial suspension through axial current. The invention further discloses a control method of the slotless skew winding axial active suspension bearingless motor.

Description

technical field [0001] The invention relates to a motor, in particular to a slotless oblique winding axially active suspension bearingless motor and a control method, which belong to the field of motor manufacturing. Background technique [0002] Bearingless motors have the characteristics of no wear, no lubrication, and no pollution, and have been widely used in medical, biochemical, semiconductor manufacturing and other fields. In a bearingless motor, five degrees of freedom in two radial directions, two torsional directions, and one axial direction of the rotor need to ensure stable magnetic levitation, and the number of active control degrees of freedom determines the number of inverters required. For example, a traditional 4-DOF actively controlled bearingless motor consists of a cylindrical rotor and two bearingless motor components connected in series, in which the 4 DOFs in the radial and torsional directions are actively controlled, while the axial direction is pass...

AI Technical Summary

Problems solved by technology

But the disadvantage of this method is that the d-axis current i d Controlling axial suspension will cause demagnetization risk to permanent magnets

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