Patent ID: 7950890
Filing Date: 2011-05-31
Classification: B25J,H01L

Abstract:
1. A vacuum robot comprising: an arm portion on which a work is disposed in a reduced pressure environment, and a motor portion rotatably driving the arm portion, the motor portion comprising: a rotor portion connected to the arm portion, the rotor portion rotating together with the arm portion in the reduced pressure environment; a stator portion disposed at an external periphery of the rotor portion, the stator portion rotating the rotor portion by electromagnetic force in an environment closer to atmospheric pressure than the reduced pressure environment; a housing, an exterior of the housing disposed in an atmospheric pressure environment, the housing holding the stator portion on an internal periphery of the housing; and a thin cylindrical can disposed in an electromagnetic gap formed between the rotor portion and the stator portion and secured to the housing so that the stator portion is air-tightly encapsulated in a space formed by the housing and the can, wherein the reduced pressure environment has a lower pressure than the environment closer to atmospheric pressure and the environment closer to atmospheric pressure has a lower pressure than the atmospheric pressure environment, and wherein the space is maintained in a depressurized state by seal, and wherein the work is transferred by causing a rotational movement of the arm portion by the motor portion; wherein the housing has at its external periphery an opening communicating with the space, and wherein the housing has at its external periphery an electric terminal configured to seal the opening and electrically connect a cable of a winding of the stator portion.