Patent ID: 7916267

Claim:
A lithographic apparatus comprising: (a) an illumination system configured to condition a radiation beam; (b) a patterning device support constructed to support a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; (c) a substrate support constructed to support a substrate; (d) a projection system configured to project the patterned radiation beam onto a target portion of the substrate; (e) a motor coupled to one of the supports; and (f) a cooling device configured to remove heat from the motor, the cooling device comprising: (i) a cooling element provided in thermal contact with at least part of the motor; (ii) a cooling duct assembly comprising a supply duct configured to supply a cooling fluid to the cooling element, a discharge duct configured to discharge the cooling fluid from the cooling element, and a recirculation duct configured to connect the discharge duct and the supply duct to each other, the recirculation duct containing a first pump; (iii) a second pump configured to cause the cooling fluid to flow through at least part of the cooling duct assembly; and (iv) a flow control device configured to control a flow rate of the cooling fluid through at least part of the cooling duct assembly, so that the cooling fluid reaches a predetermined average temperature in the cooling element.