5-DOF control double stator motor for paediatric ventricular assist device

We have developed a maglev ventricular assist device (VAD) for use in infant patients, which requires the device to be smaller compared to adult devices. In this research, a miniaturized axial gap maglev motor for use as a paediatric VAD is reported. In addition, radial position control theory using P±2 pole algorithm is proposed, and the feasibility of radial position control with the miniaturized axial gap maglev motor is examined by using magnetic field analysis. The double stator motor consists of a top stator, a bottom stator and a levitated rotor set between the stators which have an identical structure. A double stator mechanism has been adopted to enhance motor torque with a smaller device size and a large air-gap. The rotational speed and the axial position of the rotor are regulated independently based on a vector control algorithm. The inclination and the radial position of the rotor are regulated using P±2 pole algorithm. The designed motor which has an outer diameter of 28 mm and total height of 41 mm can produce a radial force using P±2 pole algorithm, and indicates a possibility of 5 degrees of freedom (DOF) controlled axial gap double stator motor.