Anyone knowledgeable about BTH motors?

The saga with my Holbrook C10 continues and I'm beginning to accept that it must be the motor. It's a 3 speed motor rated at 2HP but is a monster and is buried inside the machine. The rating plate says it's a British Thomson-Houston (BTH) KVZ4120. It has an 8 hole flange that could be unbolted with a struggle but there's no visible way to separate the drive - any suggestions on how it might be coupled?

A separate but related question - can anyone explain the difference between a conventional motor and an inverter-rated motor?

Dave
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