Spindle orientation control method and apparatus
US4398138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1981 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Oct 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/49273
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A spindle orientation control system having a speed control circuit and a position control circuit for rotating the spindle of a machine tool at a commanded speed and for stopping the spindle at a designated position with a high accuracy, the speed control circuit decelerating the spindle drive motor on the basis of a spindle stopping command. When a predetermined speed has been attained, a counter contained in the position control circuit is triggered by a one-revolution pulse generated whenever the spindle makes one full revolution, whereby the counter begins to count up position pulses which are generated whenever the spindle rotates by a predetermined angle. After a preset predetermined number of pulses have been counted, operation shifts from the speed control mode to a position control mode, and said counter is preset to a number of pulses corresponding to the angle from the present position of the spindle to the desired stopping position. Said pulse number is counted down by the position pulses and, at the same time, a voltage having a level which is proportional to the content of the counter is applied to the spindle drive motor, thereby reducing its rotational speed. When …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.