The reduced fluctuation in the electromagnetic forces of a coreless HTS linear synchronous motor
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Yoke (aeronautics)
The linear motor is available for linear transition motion, because of its advantages, the motor design and its application have gradually increased, but the quantitative measurement system of thrust force has not been generalized. Need analysis of correct thrust for control performance improvement of HB-LPM (HB-type linear pulse motor). It is difficult to analyze HB-LPMpsilas thrust. In this paper, HB-LPMpsilas thrust is expressed to mathematical expression. And it is proved validity of this numerical formula by thrust measurement system. Two phase driver is composed. It is verified validity of numerical formula that measure waveform of electric current and voltage that is supplied in each phase.
Linear induction motor
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The cylindrical permanent-magnet linear motor (PMLSM), as a linear driving device, produces the electromagnetic force to cause linear motion through the electricity directly and does not need additional mechanical conversion devices to transform rotation to linear motion. This paper calculates the electromagnetic distribution and force of two kinds of cylindrical PMLSM by ANSYS, and compares and analyzes their thrust performance. It is concluded that a radially magnetized cylindrical PMLSM is suitable for the applications requiring smaller speed variation while an axially magnetized one possesses a bigger thrust and thrust variation yet.
Linear motion
Axial symmetry
Linear induction motor
Synchronous motor
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An important drawback in PM linear synchronous motor applications is the high normal force (compared to the thrust developed by the motor itself) due to the stator-cursor magnetic attraction. A new linear motor with a very high thrust/normal force ratio has been designed and a prototype has been constructed. The motor is a PM linear synchronous motor with the PMs mounted on an ironless cursor. The motor performance have been evaluated in terms of generated forces (thrust and normal force) considering the values obtained by simulations and laboratory tests. Laboratory generated forces measurements have been performed by an "ad hoc" instrumentation described in the paper itself.
Normal force
Synchronous motor
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Yoke (aeronautics)
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In this article, the "secondary current heating method," which has been proposed in the previous articles, was used to heat-treat the laminated stator cores of actual motors to reduce the iron loss. To evaluate the magnetic properties of the laminated stator cores including the teeth, an inner core was installed inside the stator to form a closed magnetic path with the two teeth, back yoke, and inner core. The air gap between the stator and the inner core causes the loops to be tilted compared to the B–H loop of the back yoke, though it was found that the iron loss was reduced by about 30% in the laminated stator core after heat treatment.
Yoke (aeronautics)
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In this paper, the "secondary current heating method," which has been proposed in the previous reports, was used to heat-treat the laminated stator cores of actual motors to reduce iron loss. To evaluate the magnetic properties of the laminated stator cores including the teeth, an inner core was installed inside the stator to form a closed magnetic path with the two teeth, back yoke, and inner core. The air gap between the stator and the inner core causes the B-H loops to be tilted compared to the one of the back yoke, though, it was found that the iron loss was reduced by about 30% in the laminated stator core after heat treatment.
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In this paper, the iron loss characteristics of permanent magnet synchronous motor (PMSM) with a stator core made from amorphous alloy are presented both in numerical computations and experiments. In addition, a conventional motor whose stator core is made from silicon steel sheets is investigated as a comparison. Data for magnetization curve and loss curve of amorphous alloy stator core is obtained experimentally. In the calculation, time-stepping finite element method is applied in order to study iron loss at different inverter switching frequencies. The stator core is separated into 4 regions named yoke, root, body and top for the further investigation of distributions of stator core loss. Then, the components of iron loss are calculated individually according to their origins. An experimental platform is established, and the experimental results of total iron loss under different switching frequencies are obtained, and compared with the calculation results in the same situation. The comparison shows that the accuracy of calculated results can meet the needs of engineering.
Yoke (aeronautics)
Electrical steel
Synchronous motor
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Permanent magnet linear synchronous motors (PMLSMs) have been widely used as the driving source to satisfy requirements such as the speeding up of transportation systems. PMLSM is expected for the higher thrust and higher speed, thus, the thrust force characteristic is one of investigative hot spots to PMLSM. This paper presents the electromagnetic thrust force characteristics in different conditions including: frequency, length of air-gap, U / f and number of poles. The analysis results provide a foundation for the optimum design of PMLSM.
Synchronous motor
Air gap (plumbing)
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This paper presents a distributed airgap in the stator of switched reluctance machines (SRMs) to reduce the vibration and the acoustic noise levels. Distributed airgap is placed in stator tooth or yoke to analyze its effectiveness on the electromagnetic and mechanical performances. According to the observations, it has been found that when the distributed airgap is placed in the stator teeth, the generated radial force is significantly reduced. In addition, the technique reduces the stator surface deformation considerably by playing a role of spring. When the distributed airgap is placed in the stator yoke, radial force does not change significantly however it reduces the stator yoke deformation by behaving as a spring. The detailed comparison of two proposed methods is performed by electromagnetic and mechanical/acoustical finite element tools.
Yoke (aeronautics)
Air gap (plumbing)
Magnetic reluctance
Reluctance motor
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In this paper, the effect of changes in the width of teeth and yoke on stator temperature characteristics was analyzed. An initial model of fill factor 45% was produced. The validity of the temperature analysis using the thermal equivalent circuit method was experimentally verified. A basic model was selected as the initial model. Also, a temperature characteristic analysis was performed for various widths of stator teeth and yoke, and the effects were analyzed.
Yoke (aeronautics)
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