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This paper proposes the magnetic field analysis method of an induction motor using Three-Dimensional Axi-symmetric Finite Element Method (3D-ASFEM). The part of analysis that cannot be dealt with the two-dimensional magnetic field analysis is made by 3D-ASFEM. The induced voltage of the end ring is calculated by using the vector potentials obtained from 3D-ASFEM. Then, the circuit equations considering...
We measured the iron loss distribution in permanent magnet motors at different speeds by using a thermographic camera, which is capable of taking wide measurements. Both the measured motor and drive motor were placed in a vacuum chamber to reduce thermal disturbance. This motor winding has not been used for the measurement. The permanent magnet rotor was used to excite the stator.
It is well known that magnetic properties of electrical steel sheet deteriorate in constructed cores due to residual stress during manufacturing process. In this paper, we clarify the local residual stress distribution in a rotating machine core. In addition, we examine relationships between vector magnetic property and stress based on the measured local residual stress distribution.
To make clear iron loss distributions in a stator core of SPM motor under high flux density condition over 1.3T, the integral-type dynamic E&S modeling is employed. The magnetic property database for this analysis is newly prepared in the measurements of the vector magnetic properties of the core material under high flux density conditions up to 1.8T, and then the magnetic reluctivity and hysteresis...
This paper presents an improved integral-type E&S modeling for applications under high magnetic flux density conditions. In the conventional integral-type dynamic E&S modeling, we assumed linear increment of higher harmonic components including in the magnetic field strength waveforms versus the magnetic flux density. However the higher harmonic components decrease after getting a peak value...
This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic...
This paper presents analyzed results of a permanent magnet motor by using complex E&S modeling. The calculated results are compared with ones of the conventional E&S modeling for verification. Combinations of the numbers of slot and poles are investigated to tend total iron loss. The results demonstrate that the complex E&S modeling is very useful in design under consideration of rotational...
This paper presents results of iron loss evaluation of an induction motor model core by using the finite element method considering two-dimensional vector magnetic properties. In order to reduce rotational iron losses, which generate in the stator core, we tried to make holes at the tooth base parts. As a result, the rotational flux distribution was effectively controlled by making holes. In this...
This paper presents effect of magnet arrangement on torque characteristics of a magnetic flux concentration type surface magnet motor. Some constructions of the permanent magnet array were tried to reduce the cogging torque. Their magnetic flux distributions and torque characteristics were calculated by using the finite element method.
A new surface permanent magnet synchronous motor is developed by using concentrated permanent magnet arrangement. In this motor, the same magnetic poles of the assembling permanent magnets are faced to each other to generate larger magnetic flux density in the air gap. We call this the concentrated surface permanent magnet synchronous motor (CSPMSM). In order to realize higher torque and lower cogging,...
This paper is described about the design method for the development of high density rotating machines by using the two-dimensional vector magnetic property. The most important problems are how the high efficient structure is formed. Then we have developed the dual gap structure machine for using grain-oriented steel sheet.
A heterogeneous multiprocessor on a chip has been designed and implemented. It consists of 2 CPUs and 2 DRPs (Dynamic Reconfigurable Processors). The design of DRP was intended to achieve high-performance in a small area to be integrated on a SoC for embedded systems. Memory architecture of CPUs and DRPs were unified to improve programming and compiling efficiency. 54times AAC-LC stereo encoding has...
This paper presents measured distributions of two-dimensional vector magnetic properties in a three-phase induction motor model core. The time-varying local magnetic field strength vector, the flux density vector trajectory, and iron loss distributions are measured. In the measurement of the local magnetic properties, we have fabricated a large three-phase induction motor model core and used a two-dimensional...
This paper presents results of magnetic characteristic analysis of a three-phase generator utilizing grain- oriented silicon steel sheets. In the analysis, the finite element method taking account of the two-dimensional magnetic properties is used to make clear rotational iron loss distributions. In this paper, the knowledge obtained in the numerical simulations by means of an integration-type dynamic...
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