Cooling

Question 1

Electrical propulsion motor cooling

Answer 1

• The motors and their controls produce large amount of heat.
• This heat can damage motors.
• The raidiated heat can also affect the operation and condition of surrounding items.

Question 2

How is it cooled?

Answer 2

The motor is cooled by water cooled air. (Heat exchanger)

This is circulated through a motor.

Question 3

Electrical propulsion motor cooling

Cycle

Answer 3

1. Cool air is drawn through a filter into the motor.
2. This is done by 2 forced ventilation fans.
3. The air is then forced over the main poles, armature, commutator and brush gear.
4. The cool air absorbs the heat generated in the motor.
5. It is exhausted from the motor at the commutator end.
6. the air is then forced through a water cooled heat exchanger into the engine room.

Question 4

Cooling cabinet

Answer 4

•Cooling for the converter cabinet is an enclosed air system.
•Air is circulated by a fan through a heat exchanger.
•This is not unlike an air-conditioned office or classroom.
•If the heat exchanger fails:
- 2 emergency inlet panels are removed
- this allows air to be drawn into the cabinet by the circulating fan.
•This would be the equivalent of opening windows should the air-conditioning in the office or classroom fail.