Motor control circuit for accurate speed control with capacitor

Details Motor control circuit for accurate speed control with capacitor Motor control circuit for accurate speed control with capacitor

1987-12-18

1989-05-09

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323265, 323280, 323901, 494 84, 388833, 388902, 388921, 388934, 388916, G05F 1567

Patent

active

048292303

ABSTRACT:
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.

REFERENCES:
patent: 2929980 (1960-03-01), Anger
patent: 3777234 (1973-12-01), Luger
patent: 4008426 (1977-02-01), Ogura
"IC Power Supply", Elektor, vol. 5, No. 2, pp. 26-30, Feb. 1977.
"Mini Drill Speed Control," Elektor, vol. 6, No. 1, pp. 1-16 and 1-17, Jan. 1980.

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