﻿GET_GEVOMechL2_09_01_01_47 - ANIMATION Screen
1
00:00:00,000 --> 00:00:02,583
You have reached the end of this module!

2
00:00:02,583 --> 00:00:05,125
In this module, you learned to:

3
00:00:05,125 --> 00:00:08,333
State the purpose and location of the alternator.

4
00:00:08,333 --> 00:00:21,542
The ES44AC/DC locomotives are equipped with an alternator that converts rotational mechanical energy from the diesel engine into electrical power that is used by the traction motors and the locomotive’s systems.

5
00:00:21,542 --> 00:00:31,708
The ES44AC locomotives are typically equipped with a 5GMG203 or 5GMG205 alternator.

6
00:00:31,708 --> 00:00:39,083
The ES44DC locomotives are typically equipped with a 5GMG206 alternator.

7
00:00:39,083 --> 00:00:48,167
The alternators consist of two main sub-assemblies: the Traction Alternator (TA) and the auxiliary alternator (AA).

8
00:00:48,167 --> 00:00:55,625
Both assemblies are salient-pole, 3-phase, Y-connected machines mounted on a common frame in the blower cab.

9
00:00:55,625 --> 00:01:01,375
They are configured as a single unit attached to the rear, #1 end of the diesel engine.

10
00:01:01,375 --> 00:01:04,792
Explain the basic operation of the alternator.

11
00:01:04,792 --> 00:01:12,458
On ES44AC/DC locomotives, rotational mechanical energy is produced by a GEVO diesel engine.

12
00:01:12,458 --> 00:01:21,500
Using the alternator, the locomotive converts the engine’s rated 4400 hp into 3.3 MW of electrical power.

13
00:01:21,500 --> 00:01:26,083
The diesel engine crankshaft is mechanically coupled to the alternator rotor.

14
00:01:26,083 --> 00:01:35,125
The AA’s field windings are excited by the Auxiliary Alternator Field Controller (AAC) and produce a magnetic field of force.

15
00:01:35,125 --> 00:01:43,083
As the engine’s mechanical energy turns the rotor, electrical energy is induced into each set of the AA stator windings.

16
00:01:43,083 --> 00:01:52,500
These three windings produce 3-phase AC voltages that are directly proportional to the field excitation current for a given engine RPM.

17
00:01:52,500 --> 00:02:05,042
Two of the three output windings, the excitation supply windings and the battery charger supply windings, cable the AC power to power converter panels where it is converted to DC power.

18
00:02:05,042 --> 00:02:11,958
The DC power is used to excite both alternators and to recharge the locomotive’s batteries, respectively.

19
00:02:11,958 --> 00:02:21,667
The third set of output windings, the auxiliary motor supply windings, provides AC power to run seven AC motors on the locomotive.

20
00:02:21,667 --> 00:02:30,792
The TA’s field windings are excited by the Traction Alternator Field Controller (TAC) and produce a magnetic field of force.

21
00:02:30,792 --> 00:02:37,917
As the engine’s mechanical energy turns the rotor, electrical energy is induced into the TA stator windings.

22
00:02:37,917 --> 00:02:47,375
These windings produce a 3-phase AC voltage output that is directly proportional to the field excitation current for a given engine RPM.

23
00:02:47,375 --> 00:02:54,083
The induced 3-phase AC voltage is then fed to rectifier modules and converted to DC power.

24
00:02:54,083 --> 00:03:02,292
On an ES44DC locomotive, this DC power is directly distributed to the six DC traction motors.

25
00:03:02,292 --> 00:03:14,917
On an ES44AC locomotive, the rectified DC power is inverted back into 3-phase AC power by the traction inverters and then distributed to the six AC traction motors.

26
00:03:14,917 --> 00:03:21,208
The traction motors convert the electrical power back into mechanical power to pull a train.
