System for controlling the rotating speed of a pneumatically dri

Details System for controlling the rotating speed of a pneumatically dri System for controlling the rotating speed of a pneumatically dri

1989-03-16

1991-06-04

Kwon, John T.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

By shaft speed or torque responsive means

415 39, 409231, 408702, 318254, F01D 1706

Patent

active

050209680

ABSTRACT:
A rotating speed control system for a pneumatically driven spindle used in a machine tool, comprises a spindle possessing a male-threaded part, a turbine mounted on the spindle by a nut with a convexo-concave portion being formed in one face thereof, a casing for accommodating the spindle and the turbine, an air supply line connected to the casing so as to supply air to drive the turbine, a valve disposed in the air supply line so as to adjust the flow rate of the air to be supplied to the turbine, a sensor facing the convexo-concave portion of the nut so as to detect the rotating speed of the turbine, and a control circuit for comparing a sensor detected rotating speed with a predetermined rotating speed and for adjusting the valve in accordance with the difference between two rotating speeds, so as to reduce the difference.

REFERENCES:
patent: 3096467 (1963-07-01), Angus et al.
patent: 3817651 (1974-06-01), Law et al.
patent: 4076449 (1978-02-01), Theis, Jr. et al.
patent: 4088908 (1978-05-01), Gumen et al.
patent: 4426845 (1984-01-01), Brooks et al.
patent: 4475865 (1984-10-01), Sugishita et al.

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