The application relates to the technical field of
robot control, and discloses a control method and
system for a
robot finger joint, which comprises the following steps: performing multi-
physical field signal acquisition, injecting a high-frequency excitation into a driving
voltage, and extracting a current response; using a high-
frequency response to analyze a resistance value, combining a heat conduction model to calculate a real-time temperature of a coil, and reconstructing an effective
magnetic chain of a permanent
magnet according to a
temperature coefficient; according to the temperature, lubricating viscous characteristics are mapped, and an adaptive chatter
signal with the amplitude and frequency dynamically mapped to a
thermal state is generated in combination with a real-time rotating speed; based on the effective
magnetic chain, a torque conversion coefficient is corrected, and the chatter
signal is superimposed to a
current loop to generate a target current instruction to drive a motor. Through the construction of a sensorless thermal magnetic observation mechanism and a thermal viscous
coupling compensation strategy, the application effectively solves the problems of thermal parameter drift and friction nonlinearity of a miniature joint caused by space limitation, and guarantees high-precision torque output and low-
noise smooth operation in a full-temperature-range working condition.