Compliant motion control for robot

1. A robot comprising:

an arm; and

a control unit configured to control a motion of the arm using compliant motion control,

wherein the control unit configured to:

calculate a relative position of a first object moving along with the arm and a second object;

calculate a relative orientation of the first object and the second object; and

change a parameter value of the compliant motion control depending on the relative position and the relative orientation.

2. The robot according to claim 1 , wherein the control unit changes the parameter value depending on a movable range of the first object based on the relative position and orientation to the second object.

3. The robot according to claim 2 , wherein the control unit calculates a quantity as an index indicating difficulty of movement or ease of movement of the first object depending on the relative position and orientation of the first object and the second object based on the movable range and changes the parameter value based on the calculated quantity as the index.

4. The robot according to claim 1 , wherein the control unit changes a parameter value of impedance control in the compliant motion control.

5. A robot system comprising:

a robot having an arm; and

a control device configured to control a motion of the arm using compliant motion control,

wherein the control device is configured to:

calculate a relative position of a first object moving along with the arm and a second object;

calculate a relative orientation of the first object and the second object, and

change a parameter value of the compliant motion control depending on the relative position and the relative orientation.

6. A control device for a robot comprising:

a processing unit; and

a communication unit connected to the processing unit and configured to selectively communicate with the robot,

wherein the processing unit is configured to:

calculate a relative position of a first object moving along with an arm of the robot and a second object;

calculate a relative orientation of the first object and the second object; and

change a parameter value of compliant motion control for controlling a motion of the arm depending on the relative position and the relative orientation.

7. A control method for a robot comprising:

calculating a relative position of a first object moving along with an arm of the robot and a second object;

calculating a relative orientation of the first object and the second object; and

changing a parameter value of compliant motion control for controlling a motion of the arm depending on the relative position and the relative orientation.