Electro Electric Systems 1 2 Electro Electric Systems

현대 전동기 Electro Electric Systems 1

2. 보호방식 기호표 ) Electro Electric Systems 13

3. 전폐 반폐구분 Electro Electric Systems 14

7. 전동기 기본수식 P_input = 3 x V x I x P. F k. W I= 120 x f GD m²+ GDL² Eff = 375 120 x f n= Pole x Poutput Pinput n Pole Tm = Tm - TL x 100 = 3 x V x I x P. F x Eff NEMA Code Letter = 3 x V x I x P. F x Eff Ns = t= P_output = Poutput + Loss 기동k. VA Horse. Power(Hp) x (1 -Slip) nm x 100 Slip = Torque = 974 x k. W rpm 3 x V x Ist Ns - n GD m² = x TL n. L 기동k. VA = Ns nm n. L 기동계급 = NEMA Code Leter P_input : 입력(k. W) f : 주파수(Hz) NEMA Code Leter P_output : 출력(k. W) t : 기동시간(sec. ) F : 5. 0~5. 6 I : 정격전류(A) GD m² : Motor측으로 환산 GD ²(kgm ²) Ist : 기동전류(A) GDL² : 부하 GD ² (kgm ² ) Ns : 동기속도 n : rpm n L : 부하rpm Electro Electric Systems ² x GD L² 기동k. VA HP G : 5. 6~6. 3 H : 6. 3~7. 1 n m : Motor rpm 19

8. 전동기의 각종 Curve THERMAL LIMIT & TIME CURRENT CURVE SPEED & TORQUE & CURRENT CURVE SPEED & CURRENT CURVE AT FULL VOLTAGE SPEED & CURRENT CURVE AT 80% VOLTAGE 3 SPEED & TORQUE CURVE AT FULL VOLTAGE SPEED & TORQUE CURVE AT 80% VOLTAGE 2 OUTPUT VS EFF. , P. F & CURRENT CURVE EFF 1 P. F TIME CURRENT CURVE COLD AT FULL VOLTAGE HOT TIME CURRENT CURVE AT 80%VOLTAGE CURRENT Electro Electric Systems 20

최대토오크 기동전류 Breakdown torque 650% 기동토오크 Locked rotor torque 전동기 토오크 Curve Pull-up torque 전부하 Torque 부하 토오크 Curve 속도=0 동기속도 (0 % rpm) (100% rpm) Slip=1 Slip=0 Electro Electric Systems 21

13. 전동기의 결선 Single Speed 결선도 1 Star-Delta기동 L 1 L 2 L 3 6 1 2 1 3 4 3 1 5 L 1 L 2 L 3 1 3 Delta결선 Star결선 Delta결선 (운전시) (기동시) (낮은전압) (높은전압) L 1 L 2 L 3 2 3 겸용전압 2 2 1 2 3 1 2 6 4 5 6 4 3 5 Star결선 L 1 L 2 L 3 1 2 3 6 4 5 3 2 낮은전압 Delta결선 Star결선 12 7 6 1 (운전시) (기동시) L 1 L 2 L 3 1 2 3 12 10 11 7 8 9 6 4 5 7 4 5 6 8 9 10 11 12 Electro Electric Systems 높은전압 Delta결선 Star결선 12 1 6 9 3 5 11 4 10 2 8 3 11 9 (운전시) (기동시) 4 7 8 5 L 1 L 2 L 3 10 2 1 2 3 12 10 11 4 5 6 7 8 9 32

Pole Change(2 Speed) 결선 도 정출력형 정토오크형 가변토오크형 (Constant Horsepower) (Constant Torque) (Variable Torque) 2 U 2 U 2 U 1 U 1 W 2 V Speed L 1 L 2 L 3 Low 1 U 1 V 1 W 1 W 2 W 1 V Open 2 U 2 W Speed L 1 L 2 L 3 Low 1 U 1 V 1 W 2 U, 2 V, 2 W High 2 U 2 V 2 W 1 U, 1 V, 1 W Electro Electric Systems 2 W 2 2 U 1 Speed L 1 L 2 L 3 Low 1 U 1 V Y 2 U 1 2 V 1 High △ 2 U 1 2 V 1 2 W 2 2 U 2 Speed L 1 L 2 L 3 2 W Open Together Low 1 U 1 V 1 W All others High 2 U 2 V 2 W 1 U, 1 V, 1 W 1 U 2 W 1 2 U 2 1 V 2 V 2 2 V 1 1 W HIGH SPEED LOW SPEED 1 U V 1 2 V 2 W Together Open Low 1 U 1 V 1 W All others High 2 U 2 V 2 W 1 U, 1 V, 1 W 1 U Open 1 W Speed L 1 L 2 L 3 2 U, 2 V, 2 W 2 V 1 W 1 V HIGH SPEED LOW SPEED 1 V 2 V Together High 2 U 2 V 2 W 1 U, 1 V, 1 W 1 U 2 U 1 U 1 V 2 W 2 V 1 W HIGH SPEED LOW SPEED Open Together 2 U 1, 2 V 1, 2 W 1 1 W 2 W 2, 2 U 2, 2 V 2 2 W 1 1 U, 1 V, 1 W 2 W 2, 2 U 2, 2 V 2 2 W 1 2 V 2 1 U, 1 V, 1 W Speed L 1 L 2 L 3 Open Low 1 U 1 V 1 W 2 U, 2 V, 2 W High 2 U 2 V 2 W 1 U, 1 V, 1 W 33