Patent ID: 6307293
Filing Date: 2001-10-23
Classification: F16C,G11B,H02K

Abstract:
A motor comprising:a shaft;a thrust plate fixed to said shaft;a housing surrounding said shaft and said thrust plate, a gap being formed between an inner surface of said housing and an outer peripheral surface of said thrust plate, said gap being further extended between one substantially planar surface of said thrust plate and confronting surface of said housing, said gap being filled with lubricant;a single hydrodynamic radial bearing being constituted by said inner surface of said housing, said outer peripheral surface of said thrust plate and said lubricant for generating hydrodynamic pressure to support radial loads acting on said shaft and said thrust plate against said housing;a single hydrodynamic thrust bearing being constituted by said substantially planar surface of said thrust plate, said confronting surface of said housing and said lubricant for generating hydrodynamic pressure to support axial loads acting on said shaft and said thrust plate against said housing in a first axial direction; andmeans for generating magnetically supporting force for supporting said shaft and said thrust plate against said housing in a second axial direction such that said hydrodynamic pressure of said single hydrodynamic thrust bearing and magnetic force of said magnetically supporting force generating means is balanced with each other to cooperatively support axial loads acting on said shaft and said thrust plate against said housing in said first and second axial directions.