Supercharger having pre-boosting configuration

A supercharger comprising:

• a first shaft portion connected to a pulley and configured to rotate around a longitudinal axis;
• a pair of rotors each having a plurality of meshed lobes;
• a drive shaft that drives the pair of rotors;
• a clutch assembly that selectively couples the first shaft portion and the drive shaft between a disengaged position and an engaged position;
• and
• an electric motor that drives the pair of rotors and is configured to reduce a speed differential between the first shaft portion and the drive shaft upon movement from the disengaged position to the engaged position.

A supercharger comprising:

• a first shaft portion connected to a pulley and configured to rotate around a longitudinal axis;
• a pair of supercharger rotors each having a plurality of meshed lobes and each configured for concurrent rotation with a respective rotor shaft;
• a drive shaft that drives the pair of rotors;
• a clutch assembly that selectively couples the first shaft portion and the drive shaft between a disengaged position and an engaged position, the clutch assembly comprising;
• a clutch rotor mounted to the first shaft portion, wherein the clutch rotor rotates around the longitudinal axis;
• and
• a clutch armature mounted to a drive shaft and unconnected to the first shaft portion in the disengaged position, the clutch armature configured to rotate around the longitudinal axis, wherein the clutch rotor and clutch armature selectively cooperate in the engaged position and the disengaged position, wherein in the engaged position the clutch rotor and the clutch armature rotate together;
• and
• an electric motor that drives the pair of supercharger rotors and is configured to reduce a speed differential between the first shaft portion and the drive shaft upon movement from the disengaged position to the engaged position.