• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.6
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• pp.500-509
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• 2007

In this paper, we propose a novel pc-based 8-channel USB interface digital multi-controller (DMC) has capacity to be able to adjust ultrasonic motor's (USM's) the parameters-frequency, amplitude, phase difference using FPGA. The proposed DMC can control parameters directly by digital logic through a FPGA. Since it has counter circuit for rotary encoder to measure position and velocity of USM, the other separate circuits are unnecessary. Therefore, it could reduce the size of controller and the production cost. Finally, to verify the performance of proposed DMC, we tested the speed characteristic of two types USM with no-load as adjusting the parameters.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.11
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• pp.1157-1162
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• 2011

The parking brake is an essential unit embedded in the track-driving motor of an excavator. The parking brake plays an important role in keeping the excavator in place not only when it is parked, but also during the digging operation. In fact, the load placed on the parking brake during the digging operation is significantly higher than the parking load, because the impact and rating loads caused by the bucket digging force cycle frequently and have very high load ranges. Therefore, the load conditions during the digging operation should be taken into account in the parking brake certification test. In this study, a series of experiments was carried out in which various operating pressures were applied to the parking brake, where repeated loads were reciprocally placed on the brake by locking the multifriction disc and releasing the hydraulic cylinder. The characteristics of the parking brake were investigated by comparing the obtained experimental results and the theoretical design specifications.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.439-440
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.477-478
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.413-414
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• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.279-279
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• 2003

• Proceedings of the Korean Magnestics Society Conference
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• 1997.11a
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• pp.120-121
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• 1997

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.603-604
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• 2007

• Journal of KSNVE
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• v.12 no.2
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• pp.97-102
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• 2002

산업화와 활발한 생산 활동은 진동공구 사용의 급격한 증가를 가져왔다. 그러나 모터나 공기압에 의한 진동공구의 발달과 보급은 생산적, 경제적 측면에 상당한 기여를 하였지만 반면 작업자의 건강 측면에서는 상당한 해를 초래하게 되었다.(중략)

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.168-173
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• 2006