Look at the name plate. WOUND spec opd. I don't know what opd is but I know what spec means. So, if you find out what an OPD is that would be interesting. I once had a motor that said 120 V DC FWB that confused me for a long time. The FWB means Full Wave Bridge rectifier. So, it could run on pulsating DC and create the rated torque without vibrating from the pulses.
Paul
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