I'd say whether or not you can use the raw AC output depends a lot on how much of the original AC controls were retained. You need to regulate both AC voltage and frequency, and I suspect neither are directly regulated.
Also, the situation is further complicated by the fact that the stator windings are probably three-phase delta.
It sounds to me like you have essentially a very big car alternator: A three phase stator output that's rectified. The DC output voltage is regulated by varying the field (rotor) current. Frequency is, of course, determined by the speed of the motor times the number of poles and may or may not be close to 60 Hz.
You might be able to get the output voltage down to around 14 volts by reducing the field current. Maybe put a resistor in series or parallel with the field. My guess is it won't regulate very well if you do that, since it will still be trying to to make 36 volts.
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