Showing papers by "Jin Hur published in 2009"

The shape design of interior type permanent magnet BLDC motor for minimization of mechanical vibration

Abstract: This paper presents a rotor shape optimization of interior type permanent magnet (IPM) motor for vibration minimization. The vibration of permanent magnet motor is generated by cogging torque, radial force and commutation torque ripple which are electromagnetic source of vibration. In order to minimize the vibration, the optimal notches are put on the rotor pole face and the arc type pole face is applied. The variations of cogging torque and radial force of each model vibration frequency are computation by finite element method (FEM) and the validity of the analysis and rotor shape design is confirmed by vibration experiments.

A Parallel Operation Algorithm with Power-Sharing Technique for FC Generation Systems

Abstract: In this paper, a parallel operation algorithm for high power PEMFC generation systems is proposed. According to increasing the capacity of fuel cell systems with several fuel cell stacks, the different dynamic characteristics of each fuel cell stack effect on imbalance of load sharing and current distribution, so that a robust parallel operation algorithm is desired. In this paper, a power-sharing technique is developed and explained in order to design an optimal distributed PEMFC generation system. In addition, an optimal controller design procedure for the proposed parallel operation algorithm is introduced, along with informative simulations and experimental results.

Optimal design for cogging torque reduction in BLDC motor using the response surface method

Abstract: This paper presents a statistical approach to the reduction design for cogging torque in a BLDC motor. In the approach, the finite element method, the numerical optimization technique, and the response surface methodology are effectively introduced. Additionally, the proposed approach provides the effective information to design engineers. Finally, the validity of this paper is verified by test.

Brushless dc motor

Abstract: A brushless DC motor capable of facilitating assembly of shaft and rotor through key protrusion and key groove is provided to improve cooling efficiency by forming a cooling space between a stator core and a front cover, and between the stator core and a rear cap A shaft through hole and a bearing insertion groove are formed in one side of a front cover(110) A supporting protrusion is formed in an inner circumference of the front cover A rear cap is coupled with the front cover The bearing insertion groove is formed in a substrate supporting bar of the rear cap A bearing(130) is inserted in the bearing insertion groove of the front cover and the rear cap One end of a shaft(140) is protruded into outside through the shaft through hole The shaft is pivotally arranged inside the front cover and the rear cap A rotor(150) has a plurality of magnets(154), and is integrally rotated together with the shaft A sensing magnet(170) is integrally rotated together with the rotor A stator core(160) is arranged in an outer side of the rotor A PCB(180) includes a plurality of hall element sensor, and is installed in the substrate supporting bar

Pan-tilt device and camera therewith

Abstract: A pan-tilt device and a camera including the same are provided to realize a compact size by installing a panning module and a tilting module in one housing, which includes an opened front side. A lower part of a housing(200) is combined and horizontally rotated on a fixed base(100). A front side of the housing is opened. A panning module(300) is installed to an inner side of the housing and rotates the housing horizontally. A turn table(400) is combined on the housing and is rotated to a front and rear direction. A tilting module(500) is installed to the inner side of the housing, and rotates the turn table to the front and rear direction. A housing cover(600) is attached to close the front side of the housing.

Reduction-gears integrated bldc motor

Abstract: A reduction-gears integrated BLDC motor is provided to reduce a vibration and a noise by improving the concentricity of a shaft of a BLDC motor and decelerator. A stator generates magnetic force, and a rotor which is turned by the magnetic force of the stator is installed inside stator to be rotatable. An input shaft(300) passes through the rotor, and is turned together with the rotator. A sun gear rotates with the input shaft, and a plurality of planetary gears are circumscribed to the sun gear. A ring gear is inscribed to a plurality of planetary gears, and a carrier supports a plurality of planetary gears. A casing(600) has a hollow cylinder shape, and the stator and the ring gear are fixed to the inner circumference of casing.

Comparative analysis of CCM and DCM modes of interleaved boost converters for fuel cell electric vehicles

Abstract: In this paper, based on the authors' previous work, a comparative analysis of input current ripple of IBC for FCEV is carried out. With the help of the detailed analysis of input current ripple, the operational characteristics will be discussed and optimal inductor size of IBC will be calculated and compared according to CCM and DCM. The theoretical analysis will be carried out and the informative simulation results will be provided.

Analysis of low frequency current ripples in Fuel Cell Electric Vehicles considering driving conditions

Abstract: In this paper, low frequency current ripples generated by propulsion motor and three-phase inverter for motor drive in Fuel Cell Electric Vehicles (FCEVs) is analyzed and its effects are considered on the performance of fuel cell stack. For more accurate analysis, the actual driving pattern based on urban transit buses in the Manhattan is modeled and used to the entire system. The informative simulation results are provided to certify the validity of the theoretical analysis.

Emergency operating apparatus induction motor

Abstract: An emergency driving device of a three-phase induction motor is provided to prevent interruption of an operation by continuously driving a three-phase induction motor by a single phase AC voltage in a malfunction of an inverter. A first phase coil(142), a second phase coil(144), and a third phase coil(146) of a three-phase induction motor(140) are Y-connected. A DC voltage conversion part(110) converts a single phase AC power source(100) into a DC voltage. A control part(120) controls a driving of the three-phase induction motor. A switching part(130) drives the three-phase induction motor by switching the DC voltage converted by the DC voltage conversion part according to a control of the control part. A single phase AC power source is contacted in a movable terminal of a first switch(200) and a second switch(202). One side fixing terminals(a1, a2) of the first switch and the second switch are contacted in an input terminal of the DC voltage conversion part. The other side fixing terminals(b1, b2) of the first switch and the second switch are contacted in the other side fixing terminals(b3, b5) of a third switch(204) and a fifth switch(208). The other side fixing terminal of the second switch is contacted in the other side fixing terminal(b4) of a fourth switch(206) through a capacitor(212). An output terminal of the switching part is contacted in one side fixing terminals(a3, a4, a5) of the third switch, the fourth switch, and the fifth switch.