Dynamic pressure bearing motor

A hydrodynamic bearing motor, comprising:

• a base;
• a shaft connected to the base;
• a pin rotatably supported by the shaft, the pin and shaft comprising a hydrodynamic thrust bearing,
• a sleeve connected to the pin, the sleeve and shaft comprising a hydrodynamic radial bearing for rotatably supporting the pin via air, and
• a driving motor connected to the shaft and the pin,
• wherein said shaft and said sleeve have a gap therebetween comprising a first passage,
• said sleeve and said base have a gap therebetween comprising a second passage,
• the second passage comprises a magnet for trapping abraded powder,
• one of members forming the hydrodynamic radial bearing and the hydrodynamic thrust bearing is made of an austenitic stainless and the other member is made of a material harder than the austenitic stainless, and
• a stress between said one member comprising austenitic stainless and the other member comprising a material harder than austenitic stainless is at least 300 Pa when the hydrodynamic bearing motor is in a stationary state.

A hydrodynamic bearing motor, comprising:

• a base;
• a shaft connected to the base;
• a pin rotatably supported by the shaft, the pin and shaft comprising a hydrodynamic thrust bearing,
• a sleeve connected to the pin, the sleeve and shaft comprising a hydrodynamic radial bearing for rotatably supporting the pin via air, and
• a driving motor connected to the pin and the shaft,
• wherein said shaft and said sleeve have a gap therebetween comprising a first passage,
• said sleeve and said base have a gap therebetween comprising a second passage,
• the second passage comprises a magnet for trapping abraded powder,
• one of members forming the hydrodynamic radial bearing and the hydrodynamic thrust bearing comprises an austenitic stainless and the other member comprises a material almost equal in thermal expansion coefficient to the austenitic stainless, and
• a stress between said one member comprising austenitic stainless and the other member comprising a material almost equal in thermal expansion coefficient to the austenitic stainless is at least 300 Pa when the hydrodynamic bearing motor is in a stationary state.