Motor controlling method, control device and machine tool
AssigneeMakino Milling Machine Co., Ltd.
InventorsKazunari ISHII, Masashi NAGAYA
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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.
Claims7
A method of controlling a motor of a rotating shaft apparatus configured to rotate about a horizontal or inclined rotational axis, characterized by the steps of:
- positioning the rotating shaft apparatus at at least two rotational positions;
- 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, based on the stopping load torques;
- and
- controlling the motor of the rotating shaft apparatus based on the unbalance torque.
An apparatus for controlling a motor of a rotating shaft apparatus configured to rotate about a horizontal or inclined rotational axis, characterized by:
- means for positioning the rotating shaft apparatus at at least two rotational positions;
- means for measuring stopping load torque acting on the rotating shaft apparatus at each of the rotational positions;
- and
- means for calculating unbalance torque which is the stopping load torque at one of the rotational positions where the stopping load torque is the maximum, based on the stopping load torques, whereby the motor of the rotating shaft apparatus is controlled based on the unbalance torque.
Dependencies are inferred from the claim text.