By Takayuki Kishi, Mizuo Kudo, Hiromasa Iisaka (auth.), R. W. Fast (eds.)

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The authors successi vely developed a very stable and highly reliable expander using an annular collar thrust bearing with multi-feeding holes. The report given hereunder describes the details of development of an externally pressurized thrust bearing used for a high expansion ratio expander, including comparison of theoretical results and experimental ones on the bearing characteristics BASIC EQUATIONS AND SOLUTION Basic Eguation for Lubrication of Hydrostatic Thrust Bearing As is well known, the basic equation for lubrication of the hydrostatic thrust bearing is as given in the following Laplace's equation.

7 l. ) electromagnets that control the flux for each quadrant of the bearing can be seen in the photograph. In this configuration, the bias flux is supplied by a permanent magnet. The miniature bearing is designed for low magnetic losses even at high rotational speeds. Unlike conventional magnetic bearings where the flux paths in the shaft contain an azimuthat component, the flux paths are purely radial and axial in the rniniature bearing. As a result, the poles of the electromagnets surrounding the shaft are of all the same polarity, which substantially reduces the hysteresis and eddy current losses in the rotor due to shaft rotation.

40 P1 . The blowdown pressure is the expander pressure just before the exhaust valve is opened. The recompression pressure is the expander pressure just before the intake valve is opened. 26 PI for the 120 rpm case (Case 1). This b1owdown pressure was maintained for the slower speed cases, so they could be compared. A lower blowdown pressure would have increased the efficiency of the expander with a slight decrease in cooling rate. The first set of tests varied the stroke length and the speed to maintain a 1450 cm 3 / s displacement rate while holding the blowdown and recompression pressure constant (cases 1,3,5).

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