• Journal of the Korean Society of Industry Convergence
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• v.18 no.1
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• pp.1-9
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• 2015

This research dealt with a two-degree-of-freedom controller which was used for 2-dimensional force generator based on an linear motor. The gain margin of the controller may be reduced when the time constant is near to the sampling time of a discrete controller. In case of low gain controller, it cannot satisfy the control performance. A two-degree-of-freedom controller based on PI-control was proposed. It can manage performance and stability respectively. It also had a kind of a feed-forward control. This scheme can not only lessen gain of conventional PI controller in order to stability but also obtain high tracking performance.

• Proceedings of the KIEE Conference
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• 1997.07b
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• pp.488-490
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• 1997

This study is focused on the design and performance test of shaking table using stepping motor. Stepping motor can control the motion accurately with generated pulses and is applied to the shaking table. Earthquakes like El Centro and Taft are used as inputs to the shaking table. First, the number of pulses are calculated and sent to pulse generator. Then, the generator controls the table according to the pulse signs. It is shown that the measured signals from the table are in very good agreement with input signals of scale-downed earthquakes of El Centro and Taft. This table will be used for the experimental study of small-scaled building structures with tuned mass dampers under earthquakes.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.272-274
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• 1998

This paper treated the design and performance test of high speed motor/generator used in the flywheel energy storage system. The unique characteristics of the motor in this paper is the it doesn't contain any magnetic material. The field system was constructed by using Halbach array that generates the magnetic field with the permanent magnet only. The armature was also composed of plastic bobbin and winding. This paper shows the design results have a good agreement with the experimental results.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1999.04a
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• pp.186-195
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• 1999

This study is focused on the design and performance test of an earthquake simulator using stepping motor. Stepping motor which controls the motion accurately with generated pulses is applied to the earthquake simulator. Earthquakes like El Centro and Taft are used as inputs to the earthquake simulator. First the number of pulses are calculated and sent to pulse generator, . Then the generator controls the simulator according to the pulse sings, It is shown that the measured signals from the simulator are in very good agreement with input signals of scale-downed earthquakes of El Centro and Taft. This simulator will be used for the experimental study of small-scaled building structures with tuned mass dampers under earthquakes.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.231-233
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• 1995

The new hybrid scheme for electric bus is presented in this paper. This system is composed of a three-phase AC induction motor, one inveter and one system controller. The motor can be acted as starter, motor itself, alternator, generator and retarder. Various functions are simulated. The design stage has been finished. And the various experimental tests are undertaken now.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.193-196
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• 1999

The current boost type atatic excitation system for synchronous generator that can sustain prope output voltage level even at fault condition is proposed. The proposed excitation system is capabl of supplying level 60% of the rated voltage. The proposed system is verified and tested using computer simulations as well as load tests. The load tests are performed with a 5KVA synchronous generator driven by a ac motor. The actual tests results indicated a good performance.

• Journal of Electrical Engineering and Technology
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• v.12 no.3
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• pp.1219-1226
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• 2017

This paper presents the hybrid stepping machine for linear oscillating generators. The focus of the work is the suggestion of the improved model through the comparison of proposed models ; new flux concentrating PMs mover of the hybrid stepping generator is proposed based on the symmetrical and non-symmetrical stator cores of the surface mounted PMs mover, and non-slanted PMs and slanted PMs of the flux concentrating PMs mover. It is achieved using equivalent magnetic circuit considering leakage elements. Finally, this study suggests new hybrid stepping structure of linear oscillating generator.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.11a
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• pp.129-131
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• 1999

Driving generator of USMs(ultrasonic motors) with low noise, high efficiency was designed and fabricated. It was focused on merits such as size-reduction, thermal resistance, To control revolution speed, input frequency was varied. Output of generator had frequency range of 39.1 ∼ 43.5 MHz and voltage of 120 V. USM with resonant frequency 40.3 kHz exhibited a maximum torque of 2.5 kg $.$ cm and a maximum revolution speed of about 130 rpm.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.110-112
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• 2008

A linear generator driven by a hydrogen combustion engine has been developed. Unlike rotary engine-generator systems, the linear counterpart is inherently unable to start by itself unless external force is provided for initial compression/ignition cycle. When the generator is connected to utility power lines through a bidirectional power conversion system, however, the self start-up can be done by driving the generator as a motor. This paper introduces a prototype 1kW linear hydrogen engine-generator system being developed and shows the self start-up is possible with proper motoring mode.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.777-778
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• 2010