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A centrifugal compressor assembly, especially one having two or more stages, comprises a first compressor casing having. A fluid inlet and a fluid outlet and a first impeller rotatable within the first compressor casing. The assembly further comprises a second compressor casing having a fluid inlet

A centrifugal compressor assembly, especially one having two or more stages, comprises a first compressor casing having. A fluid inlet and a fluid outlet and a first impeller rotatable within the first compressor casing. The assembly further comprises a second compressor casing having a fluid inlet and a fluid outlet and a second impeller rotatable within the second compressor casing. Drive for the compressors is provided by an electric motor, preferably a permanent magnet motor, disposed between the first and second compressor casings and comprising a stator and a rotor rotatable within the stator. A drive shaft is provided, wherein the first impeller, second impeller and the rotor are mounted on the drive shaft and rotatable therewith.

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1. A compressor assembly, for compressing a fluid, which fluid consists essentially of a gas, said compressor assembly comprising: a compressor having a compressor casing comprising a fluid inlet and a fluid outlet; an impeller rotatable within the compressor casing; a permanent magnet electric

1. A compressor assembly, for compressing a fluid, which fluid consists essentially of a gas, said compressor assembly comprising: a compressor having a compressor casing comprising a fluid inlet and a fluid outlet; an impeller rotatable within the compressor casing; a permanent magnet electric motor; a rotatable drive shaft assembly extending from the electric motor into the compressor casing; the impeller being mounted on the drive shaft assembly and rotatable therewith within the compressor casing; and the electric motor comprising a stator and a rotor, the rotor being mounted on the drive shaft assembly and rotatable therewith; in operation, the permanent magnet electric motor and the impeller rotating at a speed of 25,000 rpm and higher. 2. A compressor assembly as claimed in claim 1, wherein the compressor is a centrifugal compressor. 3. A compressor assembly as claimed in claim 1, wherein the compressor rotates at a speed greater than 50,000 rpm. 4. A compressor assembly as claimed in claim 1, wherein the compressor has an input power of less than 200 horse power. 5. A compressor assembly as claimed in claim 4, wherein the compressor has an input power of from 75 to 150 horse power. 6. A compressor assembly as claimed in claim 1 comprising first and second compressors having first and second compressor casings; each of the first and second compressor casings comprising a fluid inlet and a fluid outlet; first and second impellers rotatable within the first and second compressor casings respectively; the first and second impellers being mounted on the drive shaft assembly and rotatable therewith. 7. A compressor assembly as claimed in claim 6, wherein the fluid outlet of the first compressor casing communicates with the fluid inlet of the second compressor casing. 8. A compressor assembly as claimed in claim 6, wherein the electric motor is disposed between the first and second compressor casings, with the rotor of the electric motor being mounted on the drive shaft assembly between the first and second impellers. 9. A compressor assembly as claimed in claim 1, wherein the drive shaft assembly comprises a single drive shaft. 10. A compressor assembly as claimed in claim 1, said gas being selected from the group consisting of air and nitrogen. 11. A two stage centrifugal compressor assembly comprising: a first compressor casing having a fluid inlet and a fluid outlet, which fluid consists essentially of a gas; a first impeller rotatable within the first compressor casing; a second compressor casing having a fluid inlet and a fluid outlet; a second impeller rotatable within the second compressor casing; and a permanent magnet motor disposed between the first and second compressor casings and comprising a stator and a rotor rotatable within the stator; a drive shaft; wherein the first impeller, second impeller and the rotor are mounted on the drive shaft and rotatable therewith; and the fluid outlet of the first compressor casing communicates with the fluid inlet of the second compressor casing; in operation, the permanent magnet motor and the first and second impellors rotating at a speed of 25,000 rpm or higher.