A single-stage compressor device comprising: a housing; a rotating group that includes a shaft, a support member and a compressor wheel fixed to the shaft, the compressor wheel including a front face and a back face, the front face cooperating with the housing to define a compressor flow path; a bearing that supports rotation of the rotating group within the housing; a motor that drives rotation of the rotating group within the housing; and a bleed system fluidly connected to the compressor flow path and configured to receive bleed fluid from the compressor flow path, the bleed system including a bleed passage, at least a portion of the bleed passage being cooperatively defined by the back face of the compressor wheel and an opposing surface of the housing, the bleed system configured to pass bleed air from the bleed passage, thereby alleviating thrust loading of the compressor wheel on the rotating group, characterized in that the back face of the compressor wheel includes a hub with a first engagement surface, a second engagement surface and an aperture dividing the first engagement surface from the second engagement surface, wherein the compressor wheel is fixedly attached to the support member with the first and second engagement surfaces (202a, 202b) engaging the support member, and wherein the bleed system includes a first fluid junction cooperatively defined by the aperture and the support member, the first fluid junction fluidly connecting the bleed passage to a return channel configured to return the bleed fluid to a return inlet that is fluidly connected to the compressor flow path, and wherein the compressor device comprises a retainer fixedly attached to the shaft, the compressor wheel being fixedly attached to the shaft between the retainer and the support member, wherein the retainer at least partly defines the return inlet. a housing; a rotating group that includes a shaft, a support member and a compressor wheel fixed to the shaft, the compressor wheel including a front face and a back face, the front face cooperating with the housing to define a compressor flow path; a bearing that supports rotation of the rotating group within the housing; a motor that drives rotation of the rotating group within the housing; and a bleed system fluidly connected to the compressor flow path and configured to receive bleed fluid from the compressor flow path, the bleed system including a bleed passage, at least a portion of the bleed passage being cooperatively defined by the back face of the compressor wheel and an opposing surface of the housing, the bleed system configured to pass bleed air from the bleed passage, thereby alleviating thrust loading of the compressor wheel on the rotating group, characterized in that the back face of the compressor wheel includes a hub with a first engagement surface, a second engagement surface and an aperture dividing the first engagement surface from the second engagement surface, wherein the compressor wheel is fixedly attached to the support member with the first and second engagement surfaces (202a, 202b) engaging the support member, and wherein the bleed system includes a first fluid junction cooperatively defined by the aperture and the support member, the first fluid junction fluidly connecting the bleed passage to a return channel configured to return the bleed fluid to a return inlet that is fluidly connected to the compressor flow path, and wherein the compressor device comprises a retainer fixedly attached to the shaft, the compressor wheel being fixedly attached to the shaft between the retainer and the support member, wherein the retainer at least partly defines the return inlet.