Coaxial-drive centrifuge providing tilt control relative to centrifugal force
First Claim
1. A centrifuge for tilting a sample container under supergravity conditions, said centrifuge comprising:
- a centrifuge rotor, said centrifuge rotor being rotatable about a centrifuge axis;
a tilt rotor, said tilt rotor being rotatably coupled to said centrifuge rotor so as to be rotatable about a tilt axis not coincident with said centrifuge axis;
centrifuge drive means for rotating said centrifuge rotor; and
tilt-drive means including a tilt motor for rotating said tilt rotor, said tilt-drive means including a tilt-drive shaft extending along said centrifuge axis and being rotatable about said centrifuge axis; and
servo-control means for controlling the orientation of said tilt rotor by controlling said tilt motor in part as a function of the orientation of said centrifuge rotor.
1 Assignment
0 Petitions
Accused Products
Abstract
A centrifuge includes a centrifuge rotor that rotates to provide supergravity conditions and tilt rotors that provide for sample agitation under the supergravity conditions. The centrifuge rotor is integral with a hollow centrifuge drive shaft. A tilt-drive shaft extends through the hollow and rotates coaxially of the centrifuge rotor. The tilt-drive shaft has a pinion that engages the tilt rotors, which thus are made to rotate about tilt axes that are spaced from and parallel to the centrifuge axis. A centrifuge motor is mechanically coupled to the centrifuge drive shaft to rotate the centrifuge rotor. A tilt motor is mechanically coupled to the tilt drive shaft for imparting a rocking motion of the tilt rotors (and thus of mounted sample reaction cells) relative to the centrifuge rotor. Both motors are controlled by a servo that receives orientation information from orientation encoders associated with the motors; the tilt motor is phase locked to the centrifuge motor to ensure precise relative motion control. The centrifuge motor is typically rotated to achieve a centrifugal force at the tilt rotors of about 1000 G. The tilt motor is controlled differentially relative to the centrifuge motor so that the tilt rotors rotate controllably, at, above and/or below the centrifuge rotation rate to achieve the desired rotation relative to the centrifuge. This centrifuge provides a robust and precise method of controlling fluid motion within a sample container.
55 Citations
7 Claims
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1. A centrifuge for tilting a sample container under supergravity conditions, said centrifuge comprising:
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a centrifuge rotor, said centrifuge rotor being rotatable about a centrifuge axis;
a tilt rotor, said tilt rotor being rotatably coupled to said centrifuge rotor so as to be rotatable about a tilt axis not coincident with said centrifuge axis;
centrifuge drive means for rotating said centrifuge rotor; and
tilt-drive means including a tilt motor for rotating said tilt rotor, said tilt-drive means including a tilt-drive shaft extending along said centrifuge axis and being rotatable about said centrifuge axis; and
servo-control means for controlling the orientation of said tilt rotor by controlling said tilt motor in part as a function of the orientation of said centrifuge rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification