What are the advantages and disadvantages of aluminum shell and cast iron shell?

The motor of aluminum shell is generally stable motor with high working speed of direct current, which is installed in the place where it is not very important to force, because aluminum is soft. Cast iron motor is more vigorously installed in some work on the driving force of the local environment is relatively poor place.. It's not as stable as aluminum when it's sound. Aluminum does not necessarily have sound when moving

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