Abstract
A new type of centrifuge is proposed, based on the concept of peripheral support of the rotor by the inner race of a rolling element bearing. This separates the supporting function from the motor shaft, which now only preserves the driving function. The centrifuge consists of [1] a rolling element bearing; [2] a light-weight plastic ring attached to the inner race to carry sockets with the test-tubes; [3] a housing on which the bearing outer race is mounted; and [4] a motor to drive the rotor by two spokes touching the plastic ring. The centrifuge rotor is not rigidly connected to the motor shaft, but rather through the floating spokes, and thus, the common problem of motor shaft deflection induced by rotor imbalance is alleviated. The rotational speed and the centrifugal force of the centrifuge are comparable to those of the conventional laboratory centrifuges. However, the simplicity of design and the expected life longevity promise a lower price for such a centrifuge with peripherally supported rotors.
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