Control system to reduce the effects of friction in drive trains

Details Control system to reduce the effects of friction in drive trains Control system to reduce the effects of friction in drive trains

1980-12-01

1982-08-17

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318618, 318632, G05D 23275

Patent

active

043451942

ABSTRACT:
An improved continuous-path-positioning servo-control system is provided for reducing the effects of friction arising at very low cutting speeds in the drive trains of numerically controlled cutting machines, and the like. The improvement comprises a feed forward network for altering the gain of the servo-control loop at low positioning velocities to prevent stick-slip movement of the cutting tool holder being positioned by the control system. The feed forward network shunts conventional lag-compensators in the control loop, or loops, so that the error signal used for positioning varies linearly when the value is small, but being limited for larger values. Thus, at higher positioning speeds there is little effect of the added component upon the control being achieved.

REFERENCES:
patent: 3012180 (1961-12-01), Finvold
patent: 3777243 (1973-12-01), Taguchi et al.
patent: 3790764 (1974-02-01), Rouxel
patent: 3793576 (1974-02-01), Masuzawa et al.

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