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This paper presents a multi-stage Switched Reluctance (SR) motor. In this proposed machine, the numbers of stator and rotor poles are equal in each stage. Because of the structure the proposed SR motor can achieve high torque/current ratio in operation. Also, the low-vibration operation is possible by shifting the excitation firing angle. Effectiveness of the proposed SR motor is verified by performing...
The PRM which uses reluctance torque positively and reduced the amount of magnets relatively, and the industrial low-voltage inverter to which the PRM control function is applied has been developed. Though exact motor parameters may not be known, the inverter has a control method which on-site PMM control commissioning can be performed easily for such the case. The combination test of the PRM and...
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...
A Switched Reluctance Motor (SRM) has been designed with outer dimensions, maximum torque, operating area, and maximum efficiency identical to the rare-earth PM motor used in the Toyota Prius. However, an SRM has salient poles in the rotor; thus, additional windage loss is generated. In this paper, estimation of the windage loss of the SRM is carried out. Then, a comparison to the machine test result...
Large capacity motor drive equipment, especially those with low harmonics and high efficiency, are in demand in the industrial field. In general Voltage Source Inverters (VSI) have low harmonics and high efficiency and have been widely applied in many steel plants. However, the cycloconverter drives which were applied in 1980's are still operating in many steel plants. The cycloconverter has low power...
Thin steel plates are widely used in various industrial products. But there are problems where deterioration of surface quality and metal plating occurred by transporting. As a solution to these problems, a noncontact transport of steel plates using electromagnetic force has been proposed. However, there is a risk that side slipping or the dropping of the plate may occur owing to inertial force because...
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...
In the factory, the continuous thin steel plates are subjected to iron and steel processes are supported by a series of rollers during processes such as plating and rolling. However, because the rollers come in contact with the steel plates, the problem of surface quality deterioration arises. To solve this problem, we developed a non-contact guide system for parts of the steel plate at which its...
Many large capacity motor drive equipments have been used in the steel plants. High-efficiency motor drive equipments are required in the industrial fields. On the other hand, the replacement demand of cycloconverter to VSI (Voltage Source Inverter) is also increasing. Normally, the VSI such as IGBT (Insulated Gate Bipolar Transistor) / IEGT (Injection Enhanced Gate Transistor) inverter has low-harmonics...
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