• Journal of Power Electronics
• /
• v.18 no.1
• /
• pp.103-115
• /
• 2018

Parametric uncertainties and inverter nonlinearity exist in the permanent magnet synchronous motor (PMSM) drive system of electrical vehicles, which may lead to performance degradation or failure, and eventually threaten reliable operation. Therefore, a model-free deadbeat predictive current controller (MFDPCC) for PMSM drive systems is proposed in this study. The data-driven ultra-local model of a surface-mounted PMSM (SMPMSM) drive system that consists of parametric uncertainties and inverter nonlinearity is first established through the input and output data of a SMPMSM drive system. Subsequently, MFDPCC is designed. The performance comparisons and analyses of the proposed MFDPCC, the conventional proportional-integral controller, and the model-based deadbeat predictive current controller for SMPMSM drive systems are implemented via system simulation and experimental tests. Results show the effectiveness and technical advantages of the proposed MFDPCC.

• Proceedings of the KIEE Conference
• /
• 1995.07a
• /
• pp.325-327
• /
• 1995

A new gate drive circuit of classic converter for a switched reluctance motor is presented. Conventional gate drive circuit usually consists of the isolated power supplies and signal transferring devices for isolation, such as photo coupler, pulse transformer, and gate drive chips. The proposed gate drive circuit consists of resistors, capacitors, and zenor diodes without isolated power supplies, that make the drive circuit simple and reduce the material cost. The operational modes are classified and analyzed. The characteristics of the phase current and the gate signal of upper switches is investigated with the variation of duty ratio through the experiments.

• The Journal of the Korea Contents Association
• /
• v.20 no.9
• /
• pp.380-388
• /
• 2020

This study is a subjective study on consumer's perception of drive-through as part of one method of service business to drive the drive-through service to understand how the user's perspective is more effective than the company's management position. In order to analyze the consumer's subjective viewpoint on the use of through companies, an exploratory study was conducted by selecting the Q-methodology. To this end, the analysis work was conducted in a way that the respondents classified the statement cards, and the Q population was selected and composed. Through this, the P-sample was selected and the Q-sort obtained through the classification process was used for the PC QUANL program. Was analyzed through Q factor analysis. customers divide into 3 types. Firstly, type 1 (N=14) is the people who pursue the convenience on value for time. Secondly, type 2 customers (N=4) prefer efficiency on value for time. finally, type 3 ones (N=2) put a great value on quickness. Each subjective opinion detected through this analysis will be the basis for various studies in the future, and may be used as a reference in the future direction of establishing drive-through marketing and improving the lacking parts.

• Journal of Electrical Engineering and Technology
• /
• v.6 no.2
• /
• pp.215-225
• /
• 2011

In this paper, a buck DC-DC bridge converter is used as a power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of the PFC converter is a diode bridge rectifier (DBR) fed from single phase AC mains. The PMBLDCM is used to drive the compressor of an air conditioner through a three-phase voltage source inverter (VSI) fed from a variable voltage DC link. The speed of the air conditioner is controlled to conserve energy using a new concept of voltage control at a DC link proportional to the desired speed of the PMBLDC motor. Therefore, VSI operates only as an electronic commutator of the PMBLDCM. The current of the PMBLDCM is controlled by setting the reference voltage at the DC link as a ramp. The proposed PMBLDCM drive with voltage control-based PFC converter was designed and modeled. The performance is simulated in Matlab-Simulink environment for an air conditioner compressor load driven through a 3.75 kW, 1500 rpm PMBLDC motor. To validate the effectiveness of the proposed speed control scheme, the evaluation results demonstrate improved efficiency of the complete drive with the PFC feature in a wide range of speed and input AC voltage.

• Journal of Advanced Marine Engineering and Technology
• /
• v.37 no.4
• /
• pp.391-398
• /
• 2013

Fuel consumption in a vessel can be reduced by a hull cleaning which has been performed by the industrial robot. It is most important to attach safely and travel on the hull surface for a hull cleaning robot. In this study, therefore, we have developed a drive control system of the hull cleaning robot that enables a stable drive. In addition, operator's conveniences were reflected on the drive control system for comfort robot operation. Through a drive control experiments conducted at a hull test-bed, we demonstrated the drive control performance and conveniences of the developed drive control system.

• The Journal of the Korea Contents Association
• /
• v.21 no.6
• /
• pp.513-523
• /
• 2021

This study verified the effect of Hotel Drive through Service Quality between Customer Satisfaction and Oncontinuous usage Intention. In addition, by injecting the variable of the Hotel Brand Image between Hotel Drive through Service Quality and Customer Satisfaction, we tried to find out the effect of the Moderating Role. Convenience sampling was used for customers who recently experienced Hotel Drive through Service, which is operated mainly in Seoul. It has been held for about 40 days from December 2020. The survey tool constructed through prior research was distributed to customers who experienced Hotel Drive through Service in Seoul. 289 copies of the collected effective samples were statistically processed using SPSS 22.0. As a result of the analysis, it was found that hypothesis 1 and hypothesis 2 had a significant influence relationship. The Tangibility^*Hotel Brand Image and physical environment^*Hotel Brand Image in Hypothesis 3 were found to have a modulating effect with a significant positive (+) effect. However, it was found that Responsiveness^*Hotel Brand Image and Reliability^*Hotel Brand Image had no control effect.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.3
• /
• pp.498-503
• /
• 2005

As important device that decide output load in superannuated thermoelectric power plant which do Turbine Load Set Motor device. This generation of electric power system operated Set Up Range Motor according to Set Up value that operator manufactures by hand circumvolve, and generation of electric power output load derision is consisted by internal action including Motor Therefore, in this research passively output load operated Turbine Motor Drive equipment that can have existing Turbine Load Set Motor Performance developing Digital Drive Unit device design. Also control algorithm implementation and existing Turbine Load Set Motor Drive and connection possibility through designed controlling system to connect basis function that decide development output load with Digital Drive Unit that designed also with existing Motor Drive Unit and can be operated.

• Journal of Power Electronics
• /
• v.6 no.4
• /
• pp.340-346
• /
• 2006

A high efficiency drive technique for synchronous reluctance motors (SynRM) using a neural network (NN) is presented in this paper. High efficiency drive condition depends on the mathematical model of SynRM. A NN is employed as an adaptive model of SynRM. The proposed high efficiency drive technique does not require an accurate mathematical model of SynRM. Moreover, the proposed method shows robustness against machine parameter variations because the training algorithm of the NN is executed on-line. The usefulness of the proposed method is confirmed through experimentation.

• Proceedings of the KIEE Conference
• /
• 2006.04b
• /
• pp.57-61
• /
• 2006

In the single-phase switched reluctance motor (SRM) drive, the required DC source is generally supplied by the circuit consisting of bridge rectifier and large filter capacitor connected with DC line terminal. Due to the large capacity of the capacitor, the charged time of capacitor is very short from the AC source. Lead to the bridge rectifiers draws pulsating current from the AC source side, which results in reduction of power factor and low system efficiency. Therefore a novel single-phase SRM drive system is presented in this paper, which includes drive circuit realizing reduction of torque ripple and improvement of power factor with a novel switching topology. The proposed drive circuit consists of one switching part and diode, which can separate the output of AC/DC rectifier from the large capacitor and supply power to SRM alternately, in order to realize the torque ripple reduction and power factor improvement through the switching scheme. In addition, the validity of the proposed method is tested by some simulations and experiments.

• Proceedings of the KIPE Conference
• /
• 2003.07a
• /
• pp.481-484
• /
• 2003

A strategy for a torque ripple reduction drive of single-phase SRM with high power factor is proposed. The drive for switched reluctance motor (SRM) is presented to achieve sinusoidal, near unity power factor input current with low torque ripple. The proposed SRM drive has no additional active switch. And a single-stage approach, which combines a DC link capacitor used as dc source and a drive used for driving the motor into one power stage, has a simple structure and low cost. The characteristics and validity of the proposed circuit is discussed in depth through the experimental results.