This is a BRAND NEW Emerson Intertherm/Nordyne/Miller Air Conditioning Fan Motor. It's 1/4 HP 208-230 volts 825 RPM. The Intertherm/Nordyen/Miller part number is 621911 (replaces old part # 621305) and the Emerson # is K55HXJLY-9188. The motor has three wires and takes a 5 uf Capacitor rated at 370 volts. The motor is 48Y Frame ( 5 5/8" Diameter).
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.