고속 응답형 냉각팬용 Sr 페라이트 자속집중 동기전동기 최적 설계 연구

Abstract

자동차 엔진룸에 적용되는 모터의 경우 공간에 협소와 고출력 특성을 위하여 NdFeB의 희토류를 사용하여 대응하는 것이 일반적이다. 본 논문에서는 고가의 희토류 사용을 회피하고 상대적으로 가격이 안 정되고 영구자석 직류 전동기에 주로 사용되는 Sr. 페라이트 영구자석을 적용하여 요구되는 출력밀도를 만족시키는 자동차 냉각팬용 전동기의 설 계를 제안하고자 한다. Sr. 페라이트 영구자석의 잔류자속 밀도는 0.43[T] 로써 1.2[T]인 NdFeB에 비해 1/3의 잔류자속밀도를 가지므로 동일한 공간 에 Sr 페라이트 영구자석 전동기를 적용하기 위해서는 자석의 N극과 N 극, S극과 S극을 서로 일치시켜 자속 집중을 통하여 최대 자속을 얻는 구 조를 적용하고 슬롯과 극수의 조합 특성, 회전자 형상에 따른 Cogging 토 크, 역기 전압 및 전류 당 최대 토크 특성을 설계하였다. 최적 설계를 위한 방법으로는 장하 분배법을 기초로 모터의 회전자와 고정자의 기본 치수를 정하고 전동기 각각의 Geometry상 치수를 기반으로 Parameter와 전달함수를 이용한 해석 미분법의 민감도 분석을 적용하여 모터 성능에 가장 큰 영향을 미치는 인자를 산출하고 산출된 인자를 바탕 으로 실험 계획법인 다구치 기법의 망소 특성을 통해 FEA 반복 횟수를 최소화하였다. 최적 설계 연구의 결과로 설계된 전동기는 요구되는 출력 특성을 만 족시켰으며 냉각팬과의 조합 시험을 통하여 결과를 확인하였고 Sr 페라이 트 영구자석을 적용하여 자속 집중의 최적 설계를 기반으로 NdFeB 희토 류 전동기의 대체 적용이 가능함을 확인할 수 있었다.|Study on the Optimum Design of magnetic Flux Concentration Synchronous Motor using the Sr Ferrite for Fast-Response type Cooling Fan

by YUNSOO KIM under the supervision of Professor JU LEE, Ph. D. Department of Electrical Engineering The Graduate School of Hanyang University

A motor which is installed in a car Engine room is commonly using NdFeB’s rare earth resources for small space and a high-power characteristic. This theory suggests a car cooling fan design which is fulfilled required power density through using Sr. Ferrite Permanent magnet which is used in a permanent magnet DC motor and relatively stable price instead of expensive rare earth resources. Sr. Ferrite permanent magnet’s residual flux density is 0.43[T]. Therefore it has 1/3 residual flux density compared with NdFeB’s 1.2[T]. I structured constitution which gains maximum magnetic flux through concentration of magnetic flux which is matching the same polarities(for example, South polar with south polar and north polar with north polar) and designed the maximum torque characteristic per counter voltage and current, a cogging torque for rotor form and a number of polarities and a slot’s combination characteristic. The way for an optimal design is minimizing FEA’s repeating numbers through the Taguchi design’s smaller the better characteristic which is an Experiment design based on a produced factor which affects mostly to a motor characteristic and produced through a differential method’s sensitivity analysis which used transfer function and parameter based on Geometry’s measurement of each motor, after deciding a rotor and a stator’s basics size based on a Loading distribution method. Through the result of an optimal design research the designed motor is fulfilled a output characteristic. I checked up the result through a combining test with a cooling fan. I could confirm that Sr. Ferrite permanent magnet with an optimal design can be used instead of NdFeB rare earth resources’s motor.; Study on the Optimum Design of magnetic Flux Concentration Synchronous Motor using the Sr Ferrite for Fast-Response type Cooling Fan

by YUNSOO KIM under the supervision of Professor JU LEE, Ph. D. Department of Electrical Engineering The Graduate School of Hanyang University

A motor which is installed in a car Engine room is commonly using NdFeB’s rare earth resources for small space and a high-power characteristic. This theory suggests a car cooling fan design which is fulfilled required power density through using Sr. Ferrite Permanent magnet which is used in a permanent magnet DC motor and relatively stable price instead of expensive rare earth resources. Sr. Ferrite permanent magnet’s residual flux density is 0.43[T]. Therefore it has 1/3 residual flux density compared with NdFeB’s 1.2[T]. I structured constitution which gains maximum magnetic flux through concentration of magnetic flux which is matching the same polarities(for example, South polar with south polar and north polar with north polar) and designed the maximum torque characteristic per counter voltage and current, a cogging torque for rotor form and a number of polarities and a slot’s combination characteristic. The way for an optimal design is minimizing FEA’s repeating numbers through the Taguchi design’s smaller the better characteristic which is an Experiment design based on a produced factor which affects mostly to a motor characteristic and produced through a differential method’s sensitivity analysis which used transfer function and parameter based on Geometry’s measurement of each motor, after deciding a rotor and a stator’s basics size based on a Loading distribution method. Through the result of an optimal design research the designed motor is fulfilled a output characteristic. I checked up the result through a combining test with a cooling fan. I could confirm that Sr. Ferrite permanent magnet with an optimal design can be used instead of NdFeB rare earth resources’s motor.