This is a BRAND NEW GERheem/Weather King/Corsaire/RUUD Air Conditioning Fan Motor. It's 1/5 HP 208-230 220-240 volts 850 RPM. The Rheem/Weather King/Corsaire/RUUD part number is 51-102500-04 (also 51-102008-07) and the Emerson part # is K55HXLRH-0824. It takes a 10 uf Capacitor rated at 370 volts.
An electric motor converts electrical energy into mechanical energy. In an HVAC system, motors typically turn the air conditioning fan blade and the furnace blower motor. Newer high efficient motors, such as X13 and ECM motors, have "end caps" that control the motor speeds. These can be removed and replaced separately.