| 摘要 |
PURPOSE:To eliminate excessive correction while enabling correction to be performed only by a displacement value exceeding an initial displacement value by comparing the initial displacement including accuracy on workmanship and cut on a shaft previously stored at every angular segment of a rotary shaft with the detected value of the displacement in said segment. CONSTITUTION:The initial reference displacement value and those initial displacement values due to non-uniformity of shaft machining accuracy, material qualities, and due to cuts etc are stored in memories 10, 10'. Detected displacement values a, a' obtained by displacement detectors 3x, 3y are compared with an output (e) for the initial displacement value from D/A converters 11, 11' by means of comparators 5, 5', a displacement output (f) at every angular segment given by a signal (c) from an angular position detector 8 is applied to phase control devices 6, 6 via low pas filters 12, 12' as a displacement correction command input, and electromagnet 2a, 2b and respective coils 2c, 2d are energized by excitating devices 7, 7' so that the detected displacement values a, a' may become equal to the output (e) corresponding to the initial displacement value. |
