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This paper deals with a design of the exciter which is a self-magnetizing apparatus of a written-pole motor (WPM). For a given rotor of 0.2 hp WPM, the pole shape and winding specifications of the exciter which is driven by a general voltage are optimally designed. Then, with consideration of hysteresis characteristics of a magnetic layer, the magnetization waveform is investigated with Preisach model. To validate the results calculated in design and analysis, the experimental test is carried out and comprehensive test results are suggested. Index Terms--Exciter, hysteresis, magnetization, Preisach, written pole motor.

This paper proposes a newly structured double excited two-degree-of-freedom (DOF) motor with tilt/pan motion to use in a security camera. For applications in active vision, a tilt/pan mechanism should be accurate, fast, small, inexpensive, and have low power requirements. We have designed a new type of motor meeting these requirements, which incorporates both tilt and pan into a single, two-degree-of-freedom device. The focus of the research is to design the improved 2-DOF motor which can eliminate the drawbacks as manufacturing, complicated control, and difficulty in lamination in conventional model. Additionally, to effectively improve the torque characteristic, the main pole pitch and the auxiliary pole shape are determined by the pan motion and the tilt motion, respectively. The validity of proposed structure will be shown in the computer simulation of the newly structured double excited 2-DOF motor for security cameras. Index Terms--Multi-degree-of-freedom (DOF), security camera, spherical motor, tilt/pan, 3-D finite-element method.

This paper proposes a rotary magnetic position sensor (RMPS) which has a sinusoidally magnetized permanent magnet (PM) with a small number of poles. To make the sinnsoidal magnetic flux density distribution from the PM, a magnetizing fixture is designed by adjusting its pole shape. The magnetization process is analyzed using the Preisach model and two-dimensional finite-element method (FEM). The simulation result of the magnetization is compared with the experimental one. Also, the ability of position detection from two sinusoidal signals is shown. Index Terms--Finite-element method, magnetization, Preisach model, rotary magnetic position sensor.

This paper propose the newly structured micro permanent magnet (PM) type stepping motor with claw-poles. The micro PM type stepping motor is the preferred solution for many small electronics position determination devices since it could be miniaturized. Thus, there are growing demands for PM type stepping motors with a greater mechanical torque and a smaller size. In this paper, a newly structured micro PM type stepping motor of a 6.0-mm-outer diameter is proposed. Magnetic characteristic of the developed model in comparison with the general type model is analyzed using the three-dimensional finite element analysis (3-D FEA). Simulation and experiment are performed to verify the advantages of the developed motor. Index Terms--Claw-pole, finite element analysis (FEA), holding torque, miniaturization, PM type stepping motor.

This paper presents the shape design of the permanent magnet for a rotary type magnetic position sensor for an automobile acceleration pedal using a new two-dimensional (2-D) analysis method. Basically, its flux path is not uniform in the axial direction because the magnetic flux flows three-dimensionally (3-D) between the stator yoke and permanent magnet. So, the analysis and design of the magnetic position sensor has to consider the 3-D shape. We propose a 2-D analytical modeling method of magnetic position sensor account for fringing effects and optimize the shape of the permanent magnet for a high linearity characteristic. Then, the validity of the developed method is confirmed by comparing the calculated values with the measured values. Index Terms--Finite element analysis (FEA), fringing effect, fringing permeance, magnetic position sensor.

The winding of slotless BLDC (SLBLDC) motor has a rhombic shape or hexagonal shape in its axial direction. So, its shape is not uniform in its axial direction. The analysis and design of slotless brushless dc (SLBLDC) motor must consider the three-dimensional (3-D) shape of the winding. In particular the magnetization distribution of PM as well as the shape determines the output characteristics of SLBLDC motor, which has a 3-D pattern because of the overhang. For the analysis, a new numerical method is developed. The analysis results of this method have been compared with the measured results. Index Terms--3-D analysis method, BLDC motor, slotless winding shape, small sized motor, winding angle.

This paper proposes an optimized rotor pole shape that can effectively reduce the partial demagnetization effect and cogging torque. First, for reducing the peak amplitude of the external field that directly affects the partial demagnetization on the permanent magnets in spoke-type permanent magnet motor, we conduct a variation of core shape and insertion of a barrier. Second, with the rotor shape obtained by the first processes for reducing the partial demagnetization effect, another part of the rotor pole is varied to make better sinusoidal distributed air gap flux density to reduce the cogging torque. In the process of designing the rotor pole shape, a steepest descent method and a response surface method are applied for improving convergence. By using the finite element method, we show that the optimized rotor pole shape drastically reduces the effect of the partial demagnetization and cogging torque. [ABSTRACT FROM AUTHOR]

This paper presents a design and analysis method for a novel hybrid flux permanent-magnet (PM) machine for a high-power density. By combining radial and axial flux machines with integrated windings, the air-gap flux density is increased, and an overhang structure of the PM and additional magnetic cores are applied to increase the power density. For the analysis and design of the proposed motor, a time-consuming 3-D finite-element analysis (FEA) is required owing to its unique structure. To address this problem, a correct and rapid novel analysis method is proposed using an equivalent 2-D conversion method. The accuracy of the proposed analysis method and the usefulness of the proposed motor are confirmed via the 3-D FEA and experimental results. [ABSTRACT FROM PUBLISHER]

This paper presents the shape design of the permanent magnet for a rotary type magnetic position sensor for an automobile acceleration pedal using a new two-dimensional (2-D) analysis method. Basically, its flux path is not uniform in the axial direction because the magnetic flux flows three-dimensionally (3-D) between the stator yoke and permanent magnet. So, the analysis and design of the magnetic position sensor has to consider the 3-D shape. We propose a 2-D analytical modeling method of magnetic position sensor account for fringing effects and optimize the shape of the permanent magnet for a high linearity characteristic. Then, the validity of the developed method is confirmed by comparing the calculated values with the measured values. [ABSTRACT FROM AUTHOR]