We present a new concept of bearingless slice motor that levitates and rotates a ring-shaped solid rotor. The rotor is made of a semi-hard magnetic material exhibiting magnetic hysteresis, such as D2 steel. The rotor is radially biased with a homopolar permanent-magnetic flux, on which the stator can superimpose two-pole flux to generate suspension forces. By regulating the suspension forces based on position feedback, the two radial rotor degrees of freedom are actively stabilized. The two tilting degrees of freedom and the axial translation are passively stable due to the reluctance forces from the bias flux. In addition, the stator can generate a torque by superimposing six-pole rotating flux, which drags the rotor via hysteresis coupling. This six-pole flux does not generate radial forces in conjunction with the homopolar flux or two-pole flux, and therefore the suspension force generation is in principle decoupled from the driving torque generation. We have developed a prototype system as a proof of concept. The stator has 12 teeth, each of which has a single-phase winding that is individually driven by a linear transconductance power amplifier. The system has four reflective-type optical sensors to differentially measure the two radial degrees of freedom of the rotor. The suspension control loop is implemented such that the phase margin is 25 $^\circ$ at the cross-over frequency of 110 Hz. The prototype system can levitate the rotor and drive it up to about 1730 r/min. The maximum driving torque is about 2.7 mNm.

中文翻译：

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带有磁通偏置的磁滞无轴承切片电机

我们提出了一种无轴承切片电动机的新概念，该电动机使环形固体转子悬浮并旋转。转子由具有磁滞的半硬磁性材料制成，例如D2钢。转子以同极性的永磁通量径向偏置，定子可以在其上叠加两极通量以产生悬浮力。通过基于位置反馈调节悬架力，两个径向转子的自由度被主动稳定。由于来自偏置磁通的磁阻力，两个倾斜自由度和轴向平移是被动稳定的。另外，定子可以通过叠加六极旋转磁通来产生转矩，该转矩通过磁滞耦合拖曳转子。六极磁通不会与同极磁通或两极磁通一起产生径向力，因此，悬架力的产生原则上与驱动转矩的产生是分开的。我们已经开发了原型系统作为概念验证。定子有12个齿，每个齿都有一个单相绕组，该绕组由线性跨导功率放大器分别驱动。该系统具有四个反射型光学传感器，以差分方式测量转子的两个径向自由度。实施悬架控制回路，使得在110Hz的交叉频率处，相位裕度为25埃。原型系统可以使转子悬浮，并将其驱动至约1730 r / min。最大驱动扭矩约为2.7 mNm。定子有12个齿，每个齿都有一个单相绕组，该绕组由线性跨导功率放大器分别驱动。该系统具有四个反射型光学传感器，以差分方式测量转子的两个径向自由度。实施悬架控制回路，使得在110Hz的交叉频率处，相位裕度为25埃。原型系统可以使转子悬浮，并将其驱动至约1730 r / min。最大驱动扭矩约为2.7 mNm。定子有12个齿，每个齿都有一个单相绕组，该绕组由线性跨导功率放大器分别驱动。该系统具有四个反射型光学传感器，以差分方式测量转子的两个径向自由度。实施悬架控制回路，使得在110Hz的交叉频率处，相位裕度为25埃。原型系统可以使转子悬浮，并将其驱动至约1730 r / min。最大驱动扭矩约为2.7 mNm。实施悬架控制回路，使得在110Hz的交叉频率处，相位裕度为25埃。原型系统可以使转子悬浮，并将其驱动至约1730 r / min。最大驱动扭矩约为2.7 mNm。实施悬架控制回路，使得在110Hz的交叉频率处，相位裕度为25埃。原型系统可以使转子悬浮，并将其驱动至约1730 r / min。最大驱动扭矩约为2.7 mNm。