Spindle drive system of machine tool

Details Spindle drive system of machine tool Spindle drive system of machine tool

1990-09-13

1992-01-07

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318625, 318600, 318565, 318577, 36447422, 36447426, G05B 1918

Patent

active

050794906

ABSTRACT:
A spindle drive system of a machine tool, wherein a control mode changeover section of a control unit selects one of both a speed control mode for controlling a rotational speed of a spindle through negative feedback of the rotational speed of the spindle and a position control mode for controlling a rotational position of the spindle through negative feedback of the rotational position of the spindle, and a gain changeover section changes speed loop and position loop gains to a greater value during cutting operation than during non-cutting rapid feed operation when the position control mode has been selected.

REFERENCES:
patent: 4788481 (1988-11-01), Niwa
patent: 4970449 (1990-11-01), Kawamura

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