A compressor comprising: a shell ; a first compression mechanism disposed within the shell and including a first compression member that is rotatable relative to the shell about a first rotational axis (A1) and a second compression member that is rotatable relative to the shell about a second rotational axis (A2) that is parallel to and offset from the first rotational axis (A1); a first bearing housing fixed relative to the shell and rotatably supporting a first hub of the first compression member ; a second bearing housing fixed relative to the shell and rotatably supporting a second hub of the second compression member ; a first motor assembly disposed between the first and second bearing housings and including a first rotor attached to the first compression member ; characterised by : a second compression mechanism disposed within the shell and including a third compression member that is rotatable relative to the shell about a third rotational axis (A3) and a fourth compression member that is rotatable relative to the shell about a fourth rotational axis (A4) that is parallel to and offset from the third rotational axis (A3), the fourth compression member including a fourth hub that is rotatably supported by the second bearing housing ; a third bearing housing fixed relative to the shell and rotatably supporting a third hub of the third compression member ; and a second motor assembly disposed between the second and third bearing housings and including a second rotor attached to the third compression member . a shell ; a first compression mechanism disposed within the shell and including a first compression member that is rotatable relative to the shell about a first rotational axis (A1) and a second compression member that is rotatable relative to the shell about a second rotational axis (A2) that is parallel to and offset from the first rotational axis (A1); a first bearing housing fixed relative to the shell and rotatably supporting a first hub of the first compression member ; a second bearing housing fixed relative to the shell and rotatably supporting a second hub of the second compression member ; a first motor assembly disposed between the first and second bearing housings and including a first rotor attached to the first compression member ; characterised by : a second compression mechanism disposed within the shell and including a third compression member that is rotatable relative to the shell about a third rotational axis (A3) and a fourth compression member that is rotatable relative to the shell about a fourth rotational axis (A4) that is parallel to and offset from the third rotational axis (A3), the fourth compression member including a fourth hub that is rotatably supported by the second bearing housing ; a third bearing housing fixed relative to the shell and rotatably supporting a third hub of the third compression member ; and a second motor assembly disposed between the second and third bearing housings and including a second rotor attached to the third compression member . a second compression mechanism disposed within the shell and including a third compression member that is rotatable relative to the shell about a third rotational axis (A3) and a fourth compression member that is rotatable relative to the shell about a fourth rotational axis (A4) that is parallel to and offset from the third rotational axis (A3), the fourth compression member including a fourth hub that is rotatably supported by the second bearing housing ; a third bearing housing fixed relative to the shell and rotatably supporting a third hub of the third compression member ; and a second motor assembly disposed between the second and third bearing housings and including a second rotor attached to the third compression member . <EOS>