• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.2B no.4
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• pp.174-182
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• 2002

This paper presents a comprehensive study on reducing commutation torque ripples generated in brushless DC motor drives with only a single do-link current sensor provided. In such drives, commutation torque ripple suppression techniques that are practically effective in low speed as well as high speed regions are scarcely found. The commutation compensation technique proposed here is based on a strategy that the current slopes of the incoming and the outgoing phases during the commutation interval can be equalized by a proper duty-ratio control. Being directly linked with deadbeat current control scheme, the proposed control method accomplishes suppression of the spikes and dips superimposed on the current and torque responses during the commutation intervals of the inverter. Effectiveness of the proposed control method is verified through simulations and experiments.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.4B no.3
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• pp.122-126
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• 2004

The objective of this paper is to provide a comparison between the Line Start Permanent Magnet, Skeleton type Brushless DC, and the Snail-cam type Switched Reluctance Motor. These motors are compared under the same load characteristic as the cooling fan motor of a refrigerator. The comparison consists of speed, output power, efficiency, copper loss, and cost for three different motors. For the given application, the results provide an indication of the best machine suited with respect to performance and cost.

• Journal of Power Electronics
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• v.9 no.1
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• pp.1-17
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• 2009

Permanent magnet brushless DC (PMBLDC) motors are the latest choice of researchers due to their high efficiency, silent operation, compact size, high reliability and low maintenance requirements. These motors are preferred for numerous applications; however, most of them require sensorless control of these motors. The operation of PMBLDC motors requires rotor-position sensing for controlling the winding currents. The sensorless control would need estimation of rotor position from the voltage and current signals, which are easily sensed. This paper presents state of the art PMBLDC motor drives with an emphasis on sensorless control of these motors.

• Journal of Power Electronics
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• v.14 no.3
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• pp.541-548
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• 2014

This paper presents a simple lead angle adjustment method for brushless DC motors. The proposed method is based on the motor current dynamics analysis during the current commutation interval. With the proposed scheme, the phase current and phase back-EMF voltage are in phase and the BLDC motor and drive system have a high efficiency induced by the reduced copper and conduction losses. Experimental results are shown to validate the proposed method.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.894-896
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• 2003

This paper present the design algorithm using torque and rotor volume(TRV). And, this paper introduce that how to applying the 3-Dimensional Equivalent Magnetic Circuit Network(3D EMCN) and brushless motor circuit simulator. This algorithm is applied the design program, the design shape is compared with existed brushless motor.

• Journal of Electrical Engineering and Technology
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• v.9 no.5
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• pp.1569-1576
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• 2014

This paper mainly proposes a direct torque control strategy to minimize torque ripple in brushless DC (BLDC) motor. BLDC motor has large current and torque ripple when one voltage vector applied in one cycle due to its low inductance. Hence, this paper proposed a hysteresis torque control with PWM mode to control the resultant torque. Moreover, when the direct torque control system is operating during the two-phase half-bridge $120^{\circ}$ conduction mode, large torque ripple in commutation area appears every 120 electrical degree. Based on analyzing the root of torque ripple in detail, lookup tables of switching devices states for new half-bridge modulation mode in the positive and negative reference torque put forwarded. Finally, simulations by MATLAB software and experiment results from DSP are presented to verify the feasibility and effectiveness of the proposed strategy operating in four-quadrant operation.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1094-1095
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• 2007

현재 산업분야에서는 보편적으로 방경방향 자속(Radial Flux)형 전동기가 사용되고 있다. 때문에 대용량의 경우 축방향 길이가 길어지게 되고 구조적 제약이 있는 곳에서의 적용이 어렵다. 이와 달리 축방향 자속(Axial Flux)형 전동기의 응용 범위는 광범위하며 기구적, 구조적으로 많은 이점을 지니고 있다. 본 논문에서는 7.5kW급 축방향 자속형 Brushless DC(BLDC) 전동기의 구동회로 및 속도제어 알고리즘을 구성하고 시뮬레이션과 실험을 통하여 그 결과를 검토하였다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1300-1302
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• 2005

Slotless brushless dc motor with 돗 characteristics of high speed and power density has been more widely used in industrial and factory machine. This paper deals with the dymanic simulation and test results of slotless type high-speed brushless DC(BLDC) motor. The mathmatical model of the BLDC motor is presented with the analytical solution of back EMF constant. And, the controller is implemented using a TMS320F2812 DSP-based system with power conversion circuit.

• Proceedings of the KIEE Conference
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• 2004.05a
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• pp.19-21
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• 2004

This paper considers pulse width modulation (PWM) methods which are used in 3-phase brushless DC motor controller. Due to many disadvantages of bipolar PWM method, unipolar PWM method is mostly used in industrial field. In constant speed control application, the unipolar PWM method shows a good performance of speed control. But in the wide range of speed control application, it shows a poor performance especially when deceleration is needed. So we propose hybrid PWM method that utilizes two PWM methods according to the sign of speed controller output. The simulation and experimental result shows that the proposed method improves a speed control performance of the brushless DC motor which is applied to industrial sewing machines.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.686-689
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• 2014

This Paper is about the study that use the IPM(Intelligent Power Module) which is a integrated switching module to drive inverter gates for driving of a multi-pole BLDC(Brushless Direct Current) motors. When designing a inverter using the various manufacturers IPM, it suggests a electronic circuit system to evaluate the electrical and logical characteristics of the IPM with various brands.