A servo driver is provided with a housing, a substantially cylindrical capacitor, and a case body in which the capacitor is stored. The case body has a substantially box-like shape formed by being provided with an opening portion that makes it possible to take in and out the capacitor with respect to the case body along a direction orthogonal to an axial direction of the capacitor, and is assembled to the housing so that the opening portion is covered with a closing portion that is a part of the housing. An elastically deformable cushion material is interposed between the closing portion and the capacitor. While being elastically biased to a bottom portion of the case body, the capacitor is thereby sandwiched and held between the closing portion and the bottom portion.

There are disclosed a vibration control device and a vibration control method that control shaft torsional vibration and machine stand vibration without installing a special sensor or measurement instrument. A vibration control device includes an amplification factor change unit that changes an amplification factor of an amplification unit used for amplifying a deviation between a command value and a detection value in a servo amplifier, a vibration detection unit that measures the frequency and the amplitude of vibration superimposed on a moving part, and a filter change unit that changes a filter based on the frequency and the amplitude detected by the vibration detection unit.

A numerical controller, which reciprocates a parent axis and a child axis according to a predetermined synchronization ratio by multi-axis synchronization control, is provided with a command decoding unit configured to decode a command including a plurality of command blocks, a distribution processing unit configured to generate a distribution movement amount, which is an amount of movement for each control period of a motor, based on the command blocks, an end-point correction unit configured to perform first correction processing for correcting the distribution movement amount so that a feedback position of the child axis reaches an end point, which is a turning point of the reciprocating motion, and second correction processing for recovering synchronization destroyed by the first correction processing, and a motor control unit configured to drivingly control the motor based on the corrected distribution movement amount.

A machine learning device includes: a training data acquisition unit configured to acquire multiple pieces of training data each including insulation resistances of a servomotor at the beginning and the end of a certain period and time-series data indicating conditions of the servomotor in the certain period; and a learning model generating unit configured to perform a supervised learning using the training data to thereby generate a learning model.

A controller for a parallel link mechanism includes a drive control unit that controls driving of a parallel link mechanism and a command section that gives a command for controlling an actuator to the drive control unit. The command section includes a natural frequency prediction unit that calculates a predicted value string of a natural frequency changing depending on the position of an end effector for each interpolation position of the end effector by using a dynamic model that simulates a mechanical system from a base to a link joint of the parallel link mechanism with a translational spring and simulates a mechanical system from the link joint to the end effector with one rigid body. The drive control unit includes a filter that changes a frequency component to be suppressed for each interpolation positions according to a predicted value string at each interpolation position of the end effector.

There are disclosed a vibration control device and a vibration control method that control shaft torsional vibration and machine stand vibration without installing a special sensor or measurement instrument. A vibration control device includes an amplification factor change unit that changes an amplification factor of an amplification unit used for amplifying a deviation between a command value and a detection value in a servo amplifier, a vibration detection unit that measures the frequency and the amplitude of vibration superimposed on a moving part, and a filter change unit that changes a filter based on the frequency and the amplitude detected by the vibration detection unit.

A servo control device controls a combined position of a first servo system and a second servo system having higher response than response of the first servo system. The servo control device includes a first axis target value creation unit and a correction unit. The first axis target value creation unit creates a first axis target value based on a combined command value which is a position command value of the combined position. The correction unit converts the first axis target value into a first axis command value by using a first transfer function. In addition, the correction unit converts the first axis target value by using a second transfer function, and calculates a second axis command value by subtracting the converted first axis target value from the combined command value. The product of the first transfer function and a first model transfer function which models characteristics of the first servo system is equal to the product of the second transfer function and a second model transfer function which models characteristics of the second servo system.

A numerical controller, which reciprocates a parent axis and a child axis according to a predetermined synchronization ratio by multi-axis synchronization control, is provided with a command decoding unit configured to decode a command including a plurality of command blocks, a distribution processing unit configured to generate a distribution movement amount, which is an amount of movement for each control period of a motor, based on the command blocks, an end-point correction unit configured to perform first correction processing for correcting the distribution movement amount so that a feedback position of the child axis reaches an end point, which is a turning point of the reciprocating motion, and second correction processing for recovering synchronization destroyed by the first correction processing, and a motor control unit configured to drivingly control the motor based on the corrected distribution movement amount.

A controller for a parallel link mechanism includes a drive control unit that controls driving of a parallel link mechanism and a command section that gives a command for controlling an actuator to the drive control unit. The command section includes a natural frequency prediction unit that calculates a predicted value string of a natural frequency changing depending on the position of an end effector for each interpolation position of the end effector by using a dynamic model that simulates a mechanical system from a base to a link joint of the parallel link mechanism with a translational spring and simulates a mechanical system from the link joint to the end effector with one rigid body. The drive control unit includes a filter that changes a frequency component to be suppressed for each interpolation positions according to a predicted value string at each interpolation position of the end effector.

A machine learning device includes: a training data acquisition unit configured to acquire multiple pieces of training data each including insulation resistances of a servomotor at the beginning and the end of a certain period and time-series data indicating conditions of the servomotor in the certain period; and a learning model generating unit configured to perform a supervised learning using the training data to thereby generate a learning model.