Motor controlling method, control device and machine tool
AssigneeMakino Milling Machine Co., Ltd.
InventorsKazunari Ishii, Masashi Nagaya
Life of this patent
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Abstract
A method for controlling the motor of a tool magazine that rotates around a horizontal rotation axis is configured so that: at least two indexing positions for the tool magazine are determined; the load torque acting on the tool magazine when stopped at said indexing positions is measured; an unbalance torque, which is the load torque when stopped at the indexing position at which the load torque when stopped is maximal, is calculated from multiple load torques when stopped; and the servo motor for the tool magazine is controlled on the basis of the unbalance torque.
Claims6
A method of controlling a motor of a rotating shaft apparatus configured to rotate about a horizontal or inclined rotational axis, comprising the steps of:
- positioning the rotating shaft apparatus at two rotational positions which are apart from each other by 90° around the rotational axis;
- measuring stopping load torque acting on the rotating shaft apparatus at each of the rotational positions;
- calculating unbalance torque which is the stopping load torque at one of the rotational positions where the stopping load torque is the maximum, as a square root of a sum of squares of the stopping load torques at the two rotational positions;
- and
- controlling the motor of the rotating shaft apparatus based on the calculated unbalance torque.
A device for controlling a motor of a rotating shaft apparatus configured to rotate about a horizontal or inclined rotational axis, the device comprising a non-transitory storage medium storing a program, the program, when executed by a computer, performing the steps of:
- positioning the rotating shaft apparatus at two rotational positions which are apart from each other by 90° around the rotational axis;
- measuring stopping load torque acting on the rotating shaft apparatus at each of the rotational positions;
- calculating unbalance torque which is the stopping load torque at one of the rotational positions where the stopping load torque is the maximum, as a square root of a sum of squares of the stopping load torques at the two rotational positions;
- and
- controlling the motor of the rotating shaft apparatus based on the calculated unbalance torque.
Dependencies are inferred from the claim text.