• PNF and Movement
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• 제13권2호
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• pp.55-72
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• 2015

Purpose: The purpose of this study was to propose a new therapy algorithm that combines motor imagery and physiotherapy as a physiotherapeutic clinical intervention technique that can stimulate the recovery of damaged physical function for patients with stroke. Methods: A variety of scientific research results related to motor imagery were reviewed and analyzed to investigate their applicability to physiotherapy in clinics. Results: As a new therapy algorithm for the therapeutic approach of motor imagery in stroke rehabilitation, a therapy algorithm that combines motor imagery with physiotherapy is proposed, which consists of three stages or steps: STEP 1 motor imagery familiarization, STEP 2 explicit learning stage, and STEP 3 implicit learning. Conclusion: The new therapy algorithm proposed in this study is expected to be a very useful clinical therapeutic approach for stimulating the recovery of damaged physical function in patients with stroke. It is believed that it will be necessary to confirm and standardize the effects of the therapeutic algorithm proposed in this study in the future by conducting diverse clinical studies.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.1182-1184
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• 1992

In case of chopper control is used for the d.c motor In the electric vehicle(EV) in general step down chopper is used for the driving and the step-up chopper is used for the regeneration. Bilateral variable ratio chopper system(BVRCS) formed by parallel combination of upper two chopper methods step-down, step-up and step-up/down chopper operations by duty cycle, circuit element and driving condition. In this paper, BVRCS is proposed for the simulated and experimented control of d.c motor in the EV. By the result of simulation BVRCS represents same driving power compared to the step-down and excellent breaking power compared to the step-up chopper system because of the greater motor current.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1991년도 추계학술발표회논문집
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• pp.84-88
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• 1991

The lead angle control of step motor for high speed drive is represented in this paper. It was designed position and speed information feedback system which was composed of step motor coupled with encoder, z-80, and hardware. The relationships between the lead angle and speed characteristics are established by experiments.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.530-534
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• 1989

In this paper we addressed the basic concept of microstepping, analyzed the combined effect of the motor detent torque and the current profile, and implemented a microstepping drive system using an one-chip microprocessor, power MOSFET's, and a 1.8 degree bifilar-wound hybrid-type step motor excited by a bipolar drive. Experimental results show that microstepping produces greater resolution, eliminates resonant step loss, and reduces motor vibrations.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.49-52
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• 1987

In this work, the characteristics of a six step inverter fed brushless DC motor are analyzed and the control of amplitude of inverter input voltage and phase shift of a six step inverter is discussed. The effects of the motor performance, efficiency and power factor, are studied.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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• pp.56-59
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• 1996

In this paper, we developed a micro-stepping drive circuit of step motor and proposed software algorithm for parallel operation of step motors drived by micro-stepping circuit. Also, we implemented a parallel operation controller with a 16-bit micro-controller.

• 조명전기설비학회논문지
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• 제24권12호
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• pp.156-163
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• 2010

The brushless motor is getting widely applied to the automotive component with the advantage of the high efficiency, high reliability and etc.. Most of the motor applications require the low vibration and acoustic noise. The cogging torque is the one of the main cause of the noise and vibration. The step-skewed rotor is used to reduce the cogging torque. We analyze the characteristics of the step-skewed rotor and non skewed rotor with the same stator by using 2-dimensional FEM. And then we analyze the characteristics variation according to the rotor eccentricity. The prototype is made and tested. As the results, the step-skewed rotor structure reduce the cogging torque and local radial force but it is more sensitive to rotor eccentricity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.129-131
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• 1994

Rectangular type hybrid step motor is designed to generate thirty percents higher torque than existing step motors. The torque for the motor is generated by the electromagnetic force at the air gap between the stator and rotor. The generating torque is proportioned to the rotor volume, i. e. rotor diameter. The main idea in this study is that the diameter of rotor is increased to generate more torque for the same overall motor size. This motors are manufactured by varying the shape of the teeth width of the stator and rotor. The optimum shape of the teeth is selected from the standpoint as smaller step angular accuracy.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.370-372
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• 2005

In this paper, the microcontroller TCP/IP NIE(Network Interface Equipment) which is exclusive of an operating system is implemented and the applied example to a step motor motion controller is then explained. The microcontroller TCP/IP NIE supplies a DHCP(Dynamic Host Configuration Protocol) as well as basic TCP/IP network protocols. So, the automatic setting up of the Dynamic If(Internet Protocol) is possible. To implement a control of a system with an internet, the microcontroller TCP/IP NIE is applied to a step motor motion controller and a step motor is then controlled with a Microsoft Windows-based Telnet application program.

• 전기전자학회논문지
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• 제23권1호
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• pp.9-13
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• 2019

본 논문에서는 원가 절감을 위한 개선된 $165^{\circ}$ 12 스텝 제어를 고려한 브러시리스 DC 전동기의 최적화 설계에 대하여 논한다. 개선된 12 스텝 제어는 기존 제어의 도통각 $150^{\circ}$을 확장시켜 전동기의 출력을 향상 시킬 수 있다. 향상된 전동기 출력을 고려한 반응 표면법을 이용한 최적화 설계를 통해서 회전자, 고정자 및 영구자석의 부피를 감소시켜 원가절감이 가능한 설계를 제시한다. 제안된 설계는 기존 전동기의 요구 사양 및 효율 향상을 만족하고 기존 전동기 중량의 약 3.5%를 저감하였다. 유한요소법을 이용한 전자계 해석을 통해 최적화 설계의 타당성을 입증하였다.