B - Operations – Transporting – 04 – B
Patent
B - Operations, Transporting
04
B
318/111, 323/4
B04B 9/02 (2006.01) A61M 1/00 (2006.01) A61N 2/10 (2006.01) B04B 9/10 (2006.01) H02P 1/18 (2006.01)
Patent
CA 1292505
SLOW START POWER SUPPLY Abstract of the Disclosure A slow start motor control circuit for applications wherein extremely accurate speed control is required, such as, in a centrifugal blood separator application is disclosed. In a blood separator, the degree of separation of cellular components, such as red blood cells and platelets, from the blood plasma is a function of the rotational speed of the centrifuge and the spin time. The control circuit controls the spin time and the rotational speed of the drive motor by controlling the voltage applied to the motor. The control circuit allows the drive motor to start relatively slowly to avoid cell breakage which can contaminate the plasma. After the centrifuge attains its desired operational speed, the speed of the motor is regulated and is relatively uninfluenced by ambient temperature variations.
583818
Miles Inc.
Osler Hoskin & Harcourt Llp
Perry Joseph E.
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