starting system , LE THANH PHUC

University of Technical Education Ho Chi Minh City STARTING SYSTEM Le Thanh Phuc Faculty of Automotive Engineering Email: thanhphucckd@gmail.com Introduction The starting system is a combination of mechanical and electrical parts that work together to start the engine The starting system is designed to change the electrical energy, which is being stored in the battery, into mechanical energy To accomplish this conversion, a starter or cranking motor is used Direct-Current Motor Principles Magnetic lines of force flow from the north pole to the south pole Direct-Current Motor Principles Interaction of two magnetic fields Direct-Current Motor Principles Conductor movement in a magnetic field Direct-Current Motor Principles Simple electromagnetic motor Direct-Current Motor Principles Field coil wound around a pole shoe Rotation of the conductor is in the direction of the weaker field Direct-Current Motor Principles Starter armature Starter and solenoid components Direct-Current Motor Principles Lamination construction of a typical motor armature Lap winding diagram Direct-Current Motor Principles Wave-wound armature 10 Small load: φ ≅ KφI E0 − ∆U ch − I ∑ R n≈ Ce Kφ I a1 n= I − a2 E − ∆U ch a1 = C e K φ ∑R a2 = C e K φ Large load φ = const n = b1 –b2.I Moment characteristic of the starter motor: M = f (I) F = N.f M = FD/2 B l I f = B l i = 2a N B l I D M= x 2a N B l I P π D M= x 2a π 2P P.N M= × B.l.τ I 2a.π M = CM Φ I M = CM Φ I M φ M2max M Io M2 Inm/2 I Inm Small load: φ = Kφ.I M = CM.KΦ I2 Large load: Φ = const M ≈KM.I Power characteristic of the starter motor: P = (I) P = M ω 2π n ω= 60 Eng π P = CM Φ.I × × 30 Ce Φ Eng PN π P= Φ.I × 2a 30 PN Φ 60.a P = I Eng P = I ( E0 − ∆U ch − I ∑ R ) P = I ( E0 − ∆U ch ) − I ∑ R dP = E0 − ∆U ch − I ∑ R = dI I p max E0 − ∆U ch I nm = = 2∑ R E0 − ∆U ch − I nm ∑ R = I nm E0 − ∆U ch = 2∑ R Pmax ( E0 − ∆U ch ) = 2∑ R Pmax ( E0 − ∆U ch ) − ( ∑ R) ( E0 − ∆U ch ) = ∑R 4∑ R P1 = P2 + Pñ + Pck + Pt P = I ( E0 − ∆U ch ) − I ∑ R P ∆Pck+∆Pt Io φ Inm/2 Inm Starter safety switch circuit Starter safety switch circuit Ignition coil Starter relay References  www autoshop101.com  Barry Hollembeak, Automotive Electricity and Electronics 5th edition, Delmar Cengage Learning 2011  Đỗ Văn Dũng, Hệ thống điện động điều khiển động cơ, NXB Đại học Quốc gia TP Hồ Chí Minh 2013 39 [...]...Direct-Current Motor Principles Field coils mounted to the inside of starter housing Magnetic fields in a 4-pole starter motor 11 Direct-Current Motor Principles 12 Direct-Current Motor Principles 13 Direct-Current Motor Principles 14 Direct-Current Motor Principles One-way clutch 15 Direct-Current Motor Principles Starting circuit 16 Direct-Current Motor Principles Starting circuit 17 Characteristic ...Introduction The starting system is a combination of mechanical and electrical parts that work together to start the engine The starting system is designed to change the electrical... Principles 13 Direct-Current Motor Principles 14 Direct-Current Motor Principles One-way clutch 15 Direct-Current Motor Principles Starting circuit 16 Direct-Current Motor Principles Starting circuit... characteristic of the starter motor: n = f (I) e = B.l.v B.l.π n.D e= 60 P.n e = B.l.τ 30 P.n e = Φ 30 ω D V = π.D τ= 2P π n ω= 30 N NP Eng = e = Φ n 2a a.60 Eng = Ce n Φ n= E ng C e Φ Eng = Eo − ( ∆U