G-d said to Moses: You want to know My name? I am called by My deeds. I might be called E-l Sha-dai, or Tzevakot, or Elokim, or HaVaYaH. When I judge My creatures, I am called Elokim. When I wage war on the wicked, I am called Tzevakot. When I tolerate the sins of man, I am called E-l Sha-dai. When I have compassion on My world, I am called Ha-Va-Ya-H..."
The "I Am" in Torah has a different focus than commonly used here. It directly refers to the state of exile and the children of Israel being subjugated in Egypt.

Honza, I found an article for you that should help clear it up:

Article on I am/ I shall be