Aiming at small magnetic force and the complexity of magnetic force numeral calculation for previous research of radial magnetic force model on APAM(axial placement and axial magnetization) bi-annular-shaped PMB(permanent magnetic bearings),the new construction of APAM multi-annular-shaped PMB was designed,which can make good use of magnetic energy and have greater radial magnetic force.

To overcome the shortcoming that the magnetic force of an axial magnetization PMB(permanent magnetic bearings) is usually small,a new construction of APAM(axial placement and axial magnetization) multi-annular-shaped PMB which can make good use of magnetic energy and has greater axial magnetic force was designed.

In order to study the influence on its performance of the size effect in designing axial-magnetized permanent magnet micromotor, the edge-based analysis,which was the finite element method,was adopted to simulate the torque of this kind of dual rotor motor.

In order to study the impact on its performance of the size effect in designing axial-magnetized permanent magnet micromotor,the finite element method was adopted to simulate the magnetic field of this kind of dual rotor motor,and the flux density wave form in the airgap was distributed.

To investigate the impact of size on its performance in designing an axial-magnetized permanent magnet micromotor,the edge-based finite element method is adopted to simulate the torque of this kind of dual rotor motor.

Senseless vector control of inductionmotor based on stator flux orientation;

Induction motor speed sensorless system using stator flux orientation

To settle the coupling problem in flux orientation,it is suggested that a stator flux orientation control mode without decoupler and an extended state observer(ESO) is adopted to compensate the coupled part.