Abstract: Methods and systems to mount a shaft with a motor rotor are provided. The motor may include a plurality of permanent magnets embedded in a lamination stack of a rotor of the motor, which may run through the length of the lamination stack. The motor can include a shaft that may be coupled to the rotor in a center bore of the rotor. The shaft may be coupled to the rotor with a keyway. The shaft may be coupled to the rotor with a press fit. The shaft may be coupled to the rotor with a cold shrink fit. The motor may include a counter weight disposed on the shaft. The counter weight may help retain the shaft on the rotor. The embodiments as disclosed herein can help couple the shaft and rotor without using heat that may demagnetize the permanent magnets.

Abstract: Methods and systems to mount a shaft with a motor rotor are provided. The motor may include a plurality of permanent magnets embedded in a lamination stack of a rotor of the motor, which may run through the length of the lamination stack. The motor can include a shaft that may be coupled to the rotor in a center bore of the rotor. The shaft may be coupled to the rotor with a keyway. The shaft may be coupled to the rotor with a press fit. The shaft may be coupled to the rotor with a cold shrink fit. The motor may include a counter weight disposed on the shaft. The counter weight may help retain the shaft on the rotor. The embodiments as disclosed herein can help couple the shaft and rotor without using heat that may demagnetize the permanent magnets.

Abstract: A scroll compressor includes various features that promote a bifurcated flow pattern of gas through a compressor shell to reduce oil entrainment. After entering the shell, some gas travels upward, which reduces the volume of gas traveling downward toward an oil sump. To accomplish this, the compressor's motor can be surrounded by a sleeve having upper and lower apertures for directing the flow to the motor's upper and lower stator end turns. In some embodiments, a suction inlet is strategically positioned relative to two gas passageways that are between the stator and the compressor shell. The inlet's position is such that one passageway receives incoming gas and divides the flow in opposite directions: upward and downward. The other passageway only conveys the gas upward. In addition, a suction baffle, a diffuser, a streamlined counterweight and/or a suction line oil trap can also help promote gas/oil separation or minimize oil entrainment.

Abstract: A scroll compressor includes various features that promote a bifurcated flow pattern of gas through a compressor shell to reduce oil entrainment. After entering the shell, some gas travels upward, which reduces the volume of gas traveling downward toward an oil sump. To accomplish this, the compressor's motor can be surrounded by a sleeve having upper and lower apertures for directing the flow to the motor's upper and lower stator end turns. In some embodiments, a suction inlet is strategically positioned relative to two gas passageways that are between the stator and the compressor shell. The inlet's position is such that one passageway receives incoming gas and divides the flow in opposite directions: upward and downward. The other passageway only conveys the gas upward. In addition, a suction baffle, a diffuser, a streamlined counterweight and/or a suction line oil trap can also help promote gas/oil separation or minimize oil entrainment.