How to tell what type of thermocouple is in an old, 230 V, 3 phase motor?

I have an older motor, appears to date pre 1960. It is compact and power dense, producing 100 hp up to 7000 rpm. It has two sets of thermocouple wires. I believe that the motor will over heat quickly if the temperature is too high. But how do I connect the old thermocouple wires, and how to determine the type... show more I have an older motor, appears to date pre 1960. It is compact and power dense, producing 100 hp up to 7000 rpm. It has two sets of thermocouple wires. I believe that the motor will over heat quickly if the temperature is too high. But how do I connect the old thermocouple wires, and how to determine the type of thermocouple.
Update: Each thermocouple has three wires.
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