WO2022007358A1 - 阻抗控制方法、装置、阻抗控制器和机器人 - Google Patents
阻抗控制方法、装置、阻抗控制器和机器人 Download PDFInfo
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- WO2022007358A1 WO2022007358A1 PCT/CN2020/140408 CN2020140408W WO2022007358A1 WO 2022007358 A1 WO2022007358 A1 WO 2022007358A1 CN 2020140408 W CN2020140408 W CN 2020140408W WO 2022007358 A1 WO2022007358 A1 WO 2022007358A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1656—Program controls characterised by programming, planning systems for manipulators
- B25J9/1664—Program controls characterised by programming, planning systems for manipulators characterised by motion, path, trajectory planning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1602—Program controls characterised by the control system, structure, architecture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Program-controlled manipulators
- B25J9/16—Program controls
- B25J9/1628—Program controls characterised by the control loop
- B25J9/1633—Program controls characterised by the control loop compliant, force, torque control, e.g. combined with position control
Definitions
- the present invention relates to the technical field of robot control, in particular to an impedance control method, device, impedance controller and robot.
- the torque-controlled manipulator can directly control the output force, has a faster response speed and safety, and can better meet the requirements of high safety and compliance such as service robots and collaborative robots. field.
- the control of the force-controlled manipulator is more complicated, and the full dynamics of the robot need to be considered, which has a high nonlinearity.
- the impedance control of Cartesian space has good flexibility and is suitable for interactive occasions.
- its goal is to control the relationship between force and position at the end of the robotic arm, and it cannot achieve individual control of position or force, making it impossible for the robotic arm to track the desired interaction force.
- the impedance behavior exhibited by the end is also directional coupling, that is, if only the force in the vertical direction is applied When , the other two directions that are not subject to external force will also produce motion, so it is impossible to achieve precise desired force control and so on.
- the purpose of the present invention is to provide an impedance control method, device, impedance controller and robot in order to overcome the deficiencies in the prior art.
- An embodiment of the present invention provides an impedance control method, including:
- the modified expected trajectory of the terminal is calculated by using the current environment information and the terminal expected interaction force pre-planned in the task space, according to the joint force information, the actual interaction force, the actual motion information of the terminal and Calculate the impedance control torque of the robotic arm in the joint space including the end desired information of the modified desired trajectory;
- Joint torque control is performed on the robotic arm according to the impedance control torque and the compensation torque.
- the dynamic equation is the dynamic equation of the robotic arm in the task space
- the construction of the dynamic equation in the task space includes:
- the kinematic equation of the joint space is converted to the kinematic equation of the task space based on the kinematic relationship between each joint and the tip.
- the current environmental information includes current environmental equivalent stiffness and environmental position; the current environmental information and the terminal expected interaction force pre-planned in the task space are used to calculate the modified expected trajectory of the terminal ,include:
- the modified expected trajectory of the terminal is obtained by calculating the following formula
- x f represents the environmental position
- K eq represents the environmental equivalent stiffness
- F ref represents the terminal expected interaction force
- the actual motion information includes the current actual position and actual velocity of the terminal
- the terminal expected information includes the current expected velocity, the expected acceleration, and the corrected expected trajectory of the terminal
- the speed deviation between the corrected desired trajectory and the actual position, the speed deviation between the desired speed and the actual speed, and the actual interaction force is calculated based on the spring-mass-damper model in the task space
- the impedance control torque of the robotic arm in the joint space is calculated based on the Jacobian matrix according to the acceleration control amount in the task space.
- the joint motion information includes the angular displacement and angular velocity of each joint; and the solution of the actual motion information of the terminal in the task space by forward kinematics according to the joint motion information includes:
- f(q) represents the mapping relationship between joint angular displacement and end position
- J is the Jacobian matrix
- the constructing the dynamic equation of the robotic arm in the joint space includes:
- the dynamic equation of the robotic arm in the joint space is constructed according to the acting force vector, the centrifugal force and the Cordial force matrix, the gravity vector, the actual interaction force and the joint force information.
- the nonlinear term in the dynamic equation of the mission space includes a first nonlinear term including the centrifugal force and the Cordial force matrix and a second nonlinear term including the gravity vector ;
- the first nonlinear term and the second nonlinear term are superimposed as a compensation torque for nonlinear compensation in the task space.
- An embodiment of the present invention also provides an impedance control device, including:
- the information acquisition module is used to acquire the joint motion information and joint force information of the robotic arm currently in the joint space, as well as the actual interaction force received by the end, and solve the actual motion of the end in the task space through forward kinematics according to the joint motion information. information;
- the impedance control amount calculation module calculates the modified expected trajectory of the terminal by using the current environmental information and the terminal expected interaction force pre-planned in the task space, and according to the joint force information, the actual interaction force, the terminal
- the impedance control torque of the robotic arm in the joint space is obtained by calculating the actual motion information and the end desired information including the corrected desired trajectory;
- a compensation amount calculation module for constructing a dynamic equation of the robotic arm, and determining a compensation torque according to the nonlinear term in the dynamic equation
- the torque control module is configured to perform joint torque control on the robotic arm according to the impedance control torque and the compensation torque.
- An embodiment of the present invention further provides an impedance controller, the impedance controller includes a processor and a memory, the memory stores a computer program, and the processor is configured to execute the computer program to implement the above-mentioned impedance control method .
- An embodiment of the present invention also provides a robot, which uses the above-mentioned impedance controller to control the torque of the robot arm.
- An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed, implements the above-mentioned impedance control method.
- the impedance control method of the embodiment of the present invention corrects the impedance control law by considering environmental factors and using force sensor information and environmental information, so as to realize the impedance control of direction decoupling, which is not only conducive to improving the control accuracy of the force-controlled manipulator, but also It is also beneficial to improve the flexibility and safety of the robotic arm, and help to enhance its application in human-computer interaction.
- the dynamic equation of the robot is linearized, thereby simplifying the control complexity of the force-controlled manipulator.
- FIG. 1 shows a schematic diagram of an application of a robotic arm according to an embodiment of the present invention
- FIG. 2 shows a trajectory diagram obtained by using the impedance control method in the prior art
- Fig. 3 shows the end force tracking diagram obtained using the impedance control method in the prior art
- FIG. 4 shows a first schematic flow chart of an impedance control method according to an embodiment of the present invention
- FIG. 5 shows a second schematic flowchart of the impedance control method according to the embodiment of the present invention.
- FIG. 6 shows a schematic diagram of the application of the control frame of the robotic arm according to the embodiment of the present invention.
- FIG. 7 shows a trajectory diagram of an actual test using an impedance control method according to an embodiment of the present invention
- Fig. 8 shows the end force tracking diagram of the impedance control method according to the embodiment of the present invention.
- FIG. 9 shows a schematic structural diagram of an impedance control device according to an embodiment of the present invention.
- 10-impedance control device 110-information acquisition module; 120-impedance control quantity calculation module; 130-compensation quantity calculation module; 140-torque control module.
- the manipulator has n degrees of freedom, and the degree of freedom required by the end effector (hereinafter referred to as the end) to perform a task is m, which is To make the end flexible when it interacts with the external environment, impedance control is usually used in Cartesian space.
- the impedance behavior displayed by the end is also directional coupling, that is, if only the vertical force is applied
- the other two directions that are not subject to external force will also move, so that there will be deviations from the pre-planned trajectory.
- the direction of the contact force is the z direction, and the size of the contact force (set to 10N) is kept constant while drawing a circle in a loop .
- the general impedance control method is adopted, at this time, since the inertia matrix M in the robot dynamics is coupled in the xyz direction, the circular trajectory of the end in the xy plane will be affected by the force in the z direction, which is consistent with the desired trajectory. A deviation occurs, as shown in Figure 2.
- the ideal scene should be that whichever direction is subjected to external force, the compliant motion will be generated in which direction and other directions will not be affected.
- the embodiment of the present invention proposes an impedance control method.
- the impedance control of direction decoupling is realized, which is not only beneficial to improve the control accuracy of the force-controlled robotic arm At the same time, it is also beneficial to improve the flexibility and safety of the robotic arm, and help to enhance its application in human-computer interaction.
- the control complexity of the force-controlled manipulator is simplified by compensating the nonlinear terms in the dynamic equation in real time.
- this embodiment provides an impedance control method, which can be applied to torque control of a robotic arm or a robot with redundant degrees of freedom and a degree of freedom at the end. Since the impedance control method is aimed at impedance control in a Cartesian space, that is, the end of the manipulator performs a task in the Cartesian space, the Cartesian space in this embodiment is also called a task space.
- the impedance control method will be described in detail below.
- Step S110 Obtain the joint motion information and joint force information of the robotic arm currently in the joint space and the actual interactive force received by the end, and solve the actual motion information of the end in the task space through forward kinematics according to the joint motion information.
- the actual motion information of the terminal mainly includes the actual position and actual speed of the terminal in the current task space.
- the joint motion information of each joint of the robotic arm in the joint space at each moment can be obtained first, and then based on the kinematic relationship between each joint and the end of the robot, that is, the forward kinematics can be used to solve the problem.
- the actual motion information of the end of the manipulator in the task space is not limited to the actual motion information of the end of the manipulator in the task space.
- the joint motion information may include the angular displacement q and angular velocity of each joint where q and Related to joints, they are all column vectors of n*1, where n is the degree of freedom of the robotic arm.
- the angular displacement of the corresponding joint can be collected through an angular displacement sensor or a position encoder arranged at the corresponding position of each joint, and then the corresponding angular velocity can be obtained by differentiating the angular displacement.
- the angular velocity of each joint can also be directly measured through a corresponding angular velocity sensor.
- x Both are m*1 column vectors
- m is the degree of freedom of the end of the manipulator
- f(q) represents the mapping relationship between the joint angular displacement and the end position, which can be calculated by the forward kinematics of the robot
- J is the Jacques of m*n Ratio matrix, representing the mapping relationship between joint velocity and end linear velocity.
- the above-mentioned actual interaction force received by the terminal that is, the interaction force between the terminal and the environment, can be measured by a force sensor disposed at the terminal, such as a six-dimensional force sensor.
- the above-mentioned joint force information refers to the external torque generated at each joint by the mechanical arm under the force of the environment, and specifically, it can be acquired by the torque sensor corresponding to each joint.
- Step S120 using the current environment information and the modified expected trajectory of the end of the terminal expected interaction force calculation method pre-planned in the task space, according to the force information of the joint, the actual interaction force received by the end, and the actual motion information of the end and contains The end desired information of the corrected desired trajectory calculates the impedance control torque of the manipulator in the joint space.
- the robotic arm In order for the robotic arm to complete the corresponding task, the robotic arm is usually controlled according to the pre-planned expected trajectory of the end.
- the desired information of the end of the robotic arm may include, but is not limited to, the desired trajectory of the end, the desired velocity, the desired acceleration, and the expected interaction force between the end and the environment, and the like.
- the above-mentioned step S120 mainly includes two parts, that is, adjusting the desired trajectory of the end, and calculating the corresponding impedance control torque by using the adjusted expected trajectory.
- the interaction force between the end and the environment should be determined by the stiffness of the manipulator and the stiffness of the environment.
- environmental factors are not considered at all.
- the method takes into account the influence of environmental factors, re-expects the expected trajectory of the terminal, and obtains the revised expected trajectory considering the environmental factors. It can be understood that the planned expected trajectory is replaced by the recalculated expected trajectory to achieve the purpose of correcting the expected trajectory.
- the above-mentioned environmental information includes the environmental equivalent stiffness and the environmental position.
- the environment refers to the external object that is in direct contact with the end
- the environmental equivalent stiffness is related to the environmental stiffness and the stiffness of the robotic arm, and is the environment. Stiffness as a function of arm stiffness.
- the environmental stiffness is K f and the mechanical arm stiffness is K d
- the environmental equivalent stiffness K eq is:
- the modified expected trajectory of the terminal can be calculated and obtained That is, the following formula is satisfied:
- the calculation process of the impedance control torque mainly includes the following steps:
- Step S121 Calculate the damping control in the task space based on the spring-mass-damping model according to the position deviation between the corrected expected trajectory and the actual position of the end, the speed deviation between the desired speed and the actual speed of the end, and the actual interaction force. quantity.
- the manipulator can be equivalent to a spring-mass-damping system, and the corresponding impedance control quantity is calculated based on the spring-mass-damping model.
- the stiffness matrix of the spring in the impedance control is K d (equivalent to the stiffness of the manipulator)
- the mass matrix is M d
- the damping matrix is D d
- the actual interaction force between the end and the environment is F ext .
- Step S122 Convert the joint force information from the joint space to the task space, and calculate the acceleration control amount in the task space according to the damping control amount, the expected acceleration of the end and the converted joint force information of the robotic arm.
- the acceleration control amount is calculated and obtained. That is, it satisfies:
- M(q) is a positive definite symmetric square matrix of n*n, which represents the mass matrix (also called the inertia matrix) of the manipulator; J is m*n The Jacobian matrix of .
- Step S123 calculating the impedance control torque of the robotic arm in the joint space based on the Jacobian matrix according to the acceleration control amount in the task space.
- the calculated acceleration control quantity is for the end in the task space, in order to realize the torque control of the joint, it also needs to be converted into the torque control quantity of the joint space, that is, the above-mentioned impedance control torque.
- J # is the pseudo-inverse of the Jacobian matrix J.
- the impedance control torque ⁇ cmd satisfies the following formula:
- Step S130 constructing a dynamic equation of the manipulator, and determining the compensation torque according to the nonlinear term in the dynamic equation.
- the impedance control method of this embodiment proposes to realize the impedance control of direction decoupling, and also Real-time compensation for non-linear terms such as Cordial, centrifugal, and gravitational terms in joint space or task space.
- the dynamic equation is the dynamic equation of the manipulator in the joint space.
- the acting force, centrifugal force, Korsch force, and gravity that the manipulator receives in the joint space can be calculated.
- the dynamic equation of the joint space is as follows:
- n*n is the centrifugal force and Coriolis force matrix of n*n, which can be calculated according to the joint angular displacement q, joint angular velocity
- the joint motion information is calculated;
- G(q) is the column vector of n*1 composed of the gravity of each link of the manipulator;
- ⁇ c represents the total control torque received by the manipulator, which is the column of n*1 vector;
- ⁇ ext represents the column vector composed of the external torque received by the robotic arm, which is a column vector of n*1.
- the joint space will be compensated for nonlinear terms such as the Korean force, centrifugal force, and gravity term.
- the compensation term ⁇ compensation is
- the dynamic equation is the dynamic equation of the robotic arm in the task space.
- the construction of the dynamic equation of the task space includes: firstly constructing the dynamic equation of the manipulator in the joint space, and then converting it into the dynamic equation of the task space based on the motion relationship between each joint and the end.
- the dynamic equation of the task space is as follows:
- J #T is the inverse of the transpose of the Jacobian matrix J.
- the dynamic equation is linearized by compensating for the Cordial force, the centrifugal force term, and the gravity term in the mission space.
- the compensation torque ⁇ compensation is:
- the dynamic compensation of the manipulator is usually to compensate nonlinear terms such as the Cordial force, centrifugal force and gravity term in the joint space, that is, the compensation term is At this point, the compensated kinetic equation will be simplified to According to the kinematics transformation relationship between the robot joint and the end (see step S110 above), it can be known that the dynamic equation of the compensated joint space is converted into the dynamic equation of the task space, which is It can be seen that for this task space, there are still nonlinear terms related to joint velocity.
- the above-mentioned second embodiment proposes to directly perform real-time compensation of the nonlinear term in the task space, by compensating the dynamic equation of the task space.
- Centrifugal force, Coriolis force and gravity term at this time, the dynamic equation of the mission space will be simplified to It can be seen from the above that a simpler and more intuitive terminal mission planning can be realized according to the simplified dynamic equation of the mission space.
- the manipulator can be compensated more in the task space, which realizes true linearization, and greatly simplifies the control complexity of the torque manipulator.
- Step S140 performing joint torque control on the robotic arm according to the impedance control torque and the compensation torque.
- the impedance control method of this embodiment is In the Cartesian task space, the actual external force information measured by the force sensor (including the interaction force at the end and the external torque of the joints received by the manipulator) and environmental information are introduced, so that when the robot interacts with the external environment, it shows The compliance has directional decoupling.
- the impedance control law is corrected by combining the corrected expected trajectory obtained from the environmental information, and accurate end force tracking can also be achieved, which improves the application requirements of impedance control when the end force needs to be controlled.
- the impedance control method of this embodiment can also greatly simplify the control complexity by compensating the nonlinear terms in the dynamics in real time, especially in the task space, and can well solve the nonlinear and Control complex issues, etc.
- this embodiment provides an impedance control device 10 , which includes:
- the information acquisition module 110 is used for the joint motion information and joint force information of the robotic arm currently in the joint space and the actual interaction force received by the end, and according to the joint motion information, the actual motion of the end in the task space is solved through forward kinematics information.
- the impedance control quantity calculation module 120 is configured to calculate the modified expected trajectory of the terminal by using the current environmental information and the terminal expected interaction force pre-planned in the task space, according to the joint force information, the actual interaction force, the The impedance control torque of the robotic arm in the joint space is obtained by calculating the actual motion information of the terminal and the terminal expected information including the corrected expected trajectory.
- the compensation amount calculation module 130 is configured to construct a dynamic equation of the robotic arm, and determine the compensation torque according to the nonlinear term in the dynamic equation.
- the torque control module 140 is configured to perform joint torque control on the robotic arm according to the impedance control torque and the compensation torque.
- the impedance control device 10 described above corresponds to the impedance control method of the first embodiment. Any options in Embodiment 1 are also applicable to this embodiment, and will not be described in detail here.
- the present invention also provides an impedance controller, which is applied to robot control.
- the impedance controller includes a processor and a memory, wherein the memory stores a computer program, and the processor is used to execute the computer program to implement the impedance of Embodiment 1 above.
- the present invention also provides a robot, which includes the above-mentioned impedance controller, and the torque control of the manipulator is performed by the impedance controller, so as to realize compliance control and the like.
- the robot can be a robot used in various fields, such as a cutting robot, a welding robot, a grinding robot or a massage robot, and so on.
- the present invention also provides a computer-readable storage medium for storing the computer program used in the above impedance controller.
- each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures.
- each block of the block diagrams and/or flow diagrams, and combinations of blocks in the block diagrams and/or flow diagrams can be implemented using dedicated hardware-based systems that perform the specified functions or actions. be implemented, or may be implemented in a combination of special purpose hardware and computer instructions.
- each functional module or unit in each embodiment of the present invention may be integrated to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
- the functions are implemented in the form of software function modules and sold or used as independent products, they may be stored in a computer-readable storage medium.
- the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution.
- the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.
- the aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .
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Abstract
Description
Claims (11)
- 一种阻抗控制方法,其特征在于,包括:获取机械臂当前在关节空间的关节运动信息和关节受力信息以及末端受到的实际交互力,根据所述关节运动信息通过正运动学求解所述末端在任务空间的实际运动信息;利用当前环境信息和在所述任务空间预先规划的末端期望交互力计算所述末端的修正期望轨迹,根据所述关节受力信息、所述实际交互力、所述末端的所述实际运动信息和包含所述修正期望轨迹的末端期望信息计算得到所述机械臂在所述关节空间的阻抗控制力矩;构建所述机械臂的动力学方程,根据所述动力学方程中的非线性项确定补偿力矩;根据所述阻抗控制力矩和所述补偿力矩对所述机械臂进行关节力矩控制。
- 根据权利要求1所述的阻抗控制方法,其特征在于,所述动力学方程为所述机械臂在所述任务空间的动力学方程,所述任务空间的动力学方程的构建包括:构建所述机械臂在所述关节空间的动力学方程;基于各关节与所述末端之间的运动关系将所述关节空间的动力学方程转换为所述任务空间的动力学方程。
- 根据权利要求1或2所述的阻抗控制方法,其特征在于,所述实际运动信息包括所述末端当前的实际位置和实际速度,所述末端期望信息包括所述末端当前的期望速度、期望加速度和所述修正期望轨迹;所述根据所述关节受力信息、所述实际交互力、所述末端的所述实际运动信息和包含所述修正期望轨迹的末端期望信息计算得到所述机械臂在所述关节空间的阻抗控制力矩,包括:根据所述修正期望轨迹与所述实际位置之间的位置偏差、所述期望速度和所述实际速度之间的速度偏差和所述实际交互力基于弹簧-质量-阻尼模型计算在所述任务空间的阻尼控制量;将所述关节受力信息由所述关节空间转换为所述任务空间,根据所述阻尼控制量、所述期望加速度和转换后的关节受力信息计算在所述任务空间的加速度控制量;根据所述任务空间的所述加速度控制量基于雅克比矩阵计算得到所述机械臂在所述关节空间的阻抗控制力矩。
- 根据权利要求2所述的阻抗控制方法,其特征在于,所述构建所述机械臂在所述关节空间的动力学方程,包括:根据获取的所述关节空间的所述关节运动信息计算所述机械臂受到的作用力向量、离心力与科式力矩阵、以及重力向量;根据所述作用力向量、所述离心力与科式力矩阵、所述重力向量、所述实际交互力和所述关节受力信息构建所述机械臂在关节空间的动力学方程。
- 根据权利要求6所述的阻抗控制方法,其特征在于,所述任务空间的动力学方程中的所述非线性项包括含所述离心力与科式力矩阵的第一非线性项和含所述重力向量的第二非线性项;将所述第一非线性项和所述第二非线性项进行叠加,以作为所述任务空间中进行非线性补偿的补偿力矩。
- 一种阻抗控制装置,其特征在于,包括:信息获取模块,用于获取机械臂当前在关节空间的关节运动信息和关节受力信息以及末端受到的实际交互力,根据所述关节运动信息通过正运动学求解所述末端在任务空间的实际运动信息;阻抗控制量计算模块,用于利用当前环境信息和在所述任务空间预先规划的末端期望交互力计算所述末端的修正期望轨迹,根据所述关节受力信息、所述实际交互力、所述末端的所述实际运动信息和包含所述修正期望轨迹的末端期望信息计算得到所述机械臂在所述关节空间的阻抗控制力矩;补偿量计算模块,用于构建所述机械臂的动力学方程,根据所述动力学方程中的非线性项确定补偿力矩;力矩控制模块,用于根据所述阻抗控制力矩和所述补偿力矩对所述机械臂进行关节力矩控制。
- 一种阻抗控制器,其特征在于,所述阻抗控制器包括处理器和存储器,所述存储器存储有计算机程序,所述处理器用于执行所述计算机程序以实施权利要求1-7中任一项所述的阻抗控制方法。
- 一种机器人,其特征在于,采用根据权利要求9所述的阻抗控制器进行机械臂力矩控制。
- 一种计算机可读存储介质,其特征在于,其存储有计算机程序,所述计算机程序被执行时,实施根据权利要求1-7中任一项所述的阻抗控制方法。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/408,512 US11858141B2 (en) | 2020-07-08 | 2021-08-23 | Impedance control method, and controller and robot using the same |
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