Abstract: A fluid displacement apparatus is provided. The apparatus can be in the form of a scroll element for a scroll-type fluid compressor. The apparatus has first and second scrolls. The scrolls themselves, as well as the space between the scrolls may be defined by a spiral shape. The spiral shape may have either a constant pitch or a non-constant pitch.

Abstract: A fluid displacement apparatus is provided. The apparatus can be in the form of a scroll element for a scroll-type fluid compressor. The apparatus has first and second scrolls. The scrolls themselves, as well as the space between the scrolls may be defined by a spiral shape. The spiral shape may have either a constant pitch or a non-constant pitch.

Abstract: An infinitely variable scroll-type fluid displacement apparatus comprises an orbiting scroll having a spiral element interfitted with a spiral element of a base scroll. The orbiting scroll and the base scroll are both rotatably disposed in the compressor housing and operationally connected through a rotation prevention mechanism. The orbiting scroll is continuously driven by a drive shaft, even when fluid is not displaced through the scroll-type fluid displacement apparatus. The base scroll is mounted on a carrier which has magnetic rotor elements extending in close proximity to an electromagnet. When the electromagnet is energized, an attraction force is generated between the electromagnet and the magnetic rotor elements, thereby imparting a braking force to the base scroll. Depending on the amount of braking force imparted to the base scroll, the capacity of the scroll-type fluid displacement apparatus can be infinitely varied.