Originally Posted by wlr211
One slightly tricky and unexpected element to installing the new motor was the fact that some electric motors, like the one I bought, are reversible. I needed to reverse the black and red wires inside the motor housing in order to make the motor run in the direction my system needed it to run. No big deal, I just didn't know this until after I had installed the motor and realized something wasn't right. To paraphrase the immortal words of The Who, "I won't be fooled again." At least, not by that particular issue.
Every single phase induction motor is reversible. By reversing the leads to the start and run windings, the motor will turn in the opposite direction. Induction motors include capacitor start motors (of the kind you find in high torque applications like air compressors and refrigeration motors) and split phase motors (like you find on washing machines and clothes dryers).
In fact, the whole design of Maytag top loading clothes washers revolves around the fact that the motor can be made to turn backward. There is something called a "motor relay" in Maytag washers that reverses the leads to the motor so that it turns in one direction during the wash and rinse cycle and in the opposite direction during the two spin cycles. Since the water pump is connected to the motor via a drive belt, it's the reversing direction of rotation of the pump that pumps the water out of the washer during the two spin cycles, but keeps it in the machine during the wash and rinse cycles.
Probably one of the best sources of information from which to learn about electric motors is your own American military's training manuals. There is a company called "Intergrated Publishing" (w w w.tpub.com) that makes a business of selling these manuals to the general public. Since this information was compiled at the taxpayer's expense, it is owned by the American public. So, Integrated Publishing can't charge you for this information (since you own it already); it charges you for the service of loading that information onto a CD-ROM and mailing it to you.
Integrated Publishing has all of the American military's training manuals online at:
Repair and Maintenance Manuals - Integrated Publishing
Probably the most popular training manuals are the Navy Electrical Engineering Training Series (or NEETS for short), and it can be found here:
Neets - Naval Electrical Engineering Training Series
Their electronics training manuals are also very well written and very popular.
And, all I know about electric motors comes from the section on motors and generators, which can be found here:
Neets Module 05-Introduction to Generators and Motors
and the section on induction motors (which are the kinds of motors most commonly used in furnace blowers, circulating pumps, washers, dryers and fridges can be found here:
CHAPTER 4 ALTERNATING CURRENT MOTORS