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This paper describes a novel one-axis actively regulated bearingless motor with a spinning top-shaped rotor, which is intended for a use as a cooling fan. This motor requires only one set of three-phase winding and thus one three-phase inverter to realize both rotation and magnetic suspension, and thus it is dubbed a single-drive bearingless motor. An axial position of the rotor is actively regulated...
Bearingless motors (BelMs), that can realize shaft suspending without mechanical contacts and lubrication by electromagnetic force, have been proposed. However, in outer rotor type BelMs, one-unit structure with small shaft output alone have been developed. Therefore, this paper introduces a two-unit outer rotor type BelM with consequent-pole permanent magnet structure (CPPM) for high shaft output...
This paper presents efficiency improvement of switched reluctance motors (SRMs) by stepped-skewing rotor (SSR). The cross sectional configuration of the SRM tested including size and shape of salient poles is almost same as those of a conventional SRM. The tested SRM is divided into 3 stacks, and only rotor is skewed. The skew angle has been designed to reduce both of torque ripple and radial force...
This paper proposes a new type of Modular Multilevel Converter (MMC) applying a three winding transformer. In general, MMC requires a buffer reactor in each arm, which increases number of components and converter footprint. The proposed MMC with three winding transformer does not require the buffer reactors. We describe mathematical properties of the proposed MMC. We also confirmed it operated as...
This paper describes mathematical modeling of a novel wound-field synchronous motor self-excited by space harmonics. The torque equation on the dq-reference frame is investigated to clarify the self-excitation mechanism of the proposed motor. It has been analytically explicated how the motor parameters give influences on the self-excited electromagnet torque. Furthermore, the current phase vs. torque...
For high speed bearingless disk drives, certain topologies are advantageous. The authors have published works on a bearingless disk drive for high speeds which is characterized by a slotless stator and a toroid winding set. Several different variations of this setup are imaginable. The ones which this work focuses on are the variation of the number of phases, of the number of coils, and of the applied...
New design and control of a robotic cane have been proposed in this paper. Our robotic cane has been designed so that it moves according to user's small force applied to the cane and it stably supports the user when large force is applied by the user. We confirmed our control and estimation of human force method in 2D and 3D simulation. In this paper, an overview of the design and a robust control...
This paper reviews recent technical trends in variable flux motors. Permanent magnet motor is a major component to realize high torque density with keeping high efficiency. However, when high speed revolution is required for further miniaturization, as well as the large torque in the low speed region, the flux yielded by the permanent magnet encounters a serious trade-off, i.e. the former needs less...
IPMSMs (Interior Permanent Magnet Synchronous Motors) are widely used for many industrial applications. However, IPMSMs cause large noise and vibration due to torque ripple and radial force. In this paper, 6th radial force modelling is constructed based on flux linkage and 6th radial force is controlled on the ground of this modelling. Firstly, we make some assumptions to lead 6th radial force modelling...
Among other bilateral control systems, those of symmetric type have advantage of simple structure, force sensorless and readiness to stabilize. However, a symmetric type bilateral system is known to have poor haptic performance. In this paper, we propose a bilateral system design without force sensor, based on a generalized system structure of master slave systems. Force feedback and position tracking...
Sensorless vector control of an interior permanent magnet synchronous motor (IPMSM) has been studied in many papers. The extended electromotive force (EMF) based method is one of the representative systems. We proposed a simplified method which estimates the rotor position using the controlled voltage without using observer. In this paper we have compared these methods through trajectories of poles...
This paper proposes a simple magnetic equivalent circuit using permeance method in order to design rough configurations of the lowest loss motor. First, the iron loss is calculated by the proposed method and compared with the analysis result by finite element method (FEM). As a result, the error of the calculation results between the proposed method and the FEM is 2.9%. Next, the motor losses are...
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