Self-Sensing Control of Highly Efficient Self-Bearing Motor for Artificial Heart

研究了自承重电机作为人工心脏执行器的应用。当应用于人工心脏执行器时，要求系统小型化、高效率、低功耗和低发热。此外，转子和定子之间的正弦磁链分布也更有利于抑制磁力矩，实现稳定的悬浮控制。自轴承电机是一种主动控制系统，需要一定类型的传感器。因此，自感知是实现系统小型化的重要技术，本课题提出了基于差动变压器原理的内置式永磁自承电机自感知控制技术。由于IPM型电机的凸极特性，主磁通(d轴)方向磁导不同于其正交(q轴)方向磁导。当IPM型转子旋转时，驱动线圈与…之间的互感此外，控制线圈不仅随径向位移变化，而且随着其旋转角度的变化而变化。首先，采用有限元方法对转子内部永磁体的磁场分布进行了分析。根据分析结果设计并制作了IPM自承电机样机。其次，为了获得更稳定的差动输出，引入了新的全波整流检测方法，并提出了新的补偿方法来线性化自感知信号的非线性特性。最后，为了验证所提出的补偿方法，制作了内部PM型主动磁轴承并进行了测试。实验结果表明，该方法在静态实验中表现出了无干扰和线性特性，实现了6000rpm的稳定旋转控制，验证了该方法用于IPM型自承式电机自感知控制的可能性和可行性。现在，我们计划改进线性化补偿，并将其应用于IPM型自承式电机，以开发现有的作为人工心脏的执行器。较少

Application of self-bearing motor as an actuator for an artificial heart was considered. When it is applied to an artificial heart actuator, miniaturization of the system, high efficiency, low power consumption and low heat generation is required. Moreover, the sinusoidal flux distribution between the rotor and the stator is also preferable to suppress dogging torque and realize stable levitation control Self-bearing motor is an active control system, which requires a certain type of sensor. Therefore, self-sensing is very important technique to realize miniaturization of the system.This project proposed self-sensing control technique based on the principle of differential transformer to the interior permanent magnet (IPM) type self-bearing motor. Main flux (d-axis) directional permeance is different from its orthogonal (q-axis) directional one because of the salient pole property in the IPM type motor. When the IPM type rotor rotates, the mutual inductance between the driving coil and … More the control coil varies with not only radial displacement but also its rotation angle. It means that the radial direction displacement information is not detected simply from the mutual inductance independently.First, Magnetic field analysis using finite element method was done to analyze the allocation of the interior permanent magnets of the rotor. Prototype IPM self-bearing motor was designed and fabricated from the analyzed results.Secondary, new detection method using full-wave rectification was introduced to obtain the more stable differential output and new compensation was also proposed to linearize the nonlinear characteristics of the self-sensing signal.Finally, to confirm the proposed compensation method, an internal PM type active magnetic bearing was made and tested. The result showed no interference and linear characteristics in the static experiment and accomplished stable rotation control up to 6,000rpm.From these results, we confirmed that the proposed method has high possibility and feasibility for self-sensing control of the IPM type self-bearing motor. Now we plan to improve linearized compensation and apply to the IPM type self-bearing motor for development of the available actuator as an artificial heart. Less