Electric linear motion actuator

摘要

An electric linear motion actuator includes an electric motor, a motion converting mechanism that converts the rotational motion of the electric motor into a linear motion of a linear moving member, a load sensor that detects the magnitude of the load applied to the brake disk from the linear moving member, and a controller that performs feedback control on the electric motor based on the difference between the load detected by the load sensor and a load command value. The controller reduces the number of revolutions of the electric motor when the linear moving member moves into a predetermined zone immediately before the position where the clearance between the linear moving member and the brake disk becomes zero.

主权项

1. An electric linear motion actuator comprising:
an electric motor; a linear moving member capable of moving between a standby position where the linear moving member is spaced apart from a target with a predetermined clearance between the linear moving member and the target and a load applying position where the linear moving member contacts the target to apply a load to the target; a motion converting mechanism that converts a rotational motion of the electric motor into a linear motion of the linear moving member; a load sensor that detects a magnitude of the load applied to the target from the linear moving member; and a controller configured to perform a feedback control in which based on a difference between the load detected by the load sensor and a load command value, the electric motor is controlled so that the load applied from the linear moving member to the target becomes equal to the load command value, wherein the controller comprises an overshoot suppression control means configured to reduce a number of revolutions of the electric motor when the linear moving member moves from the standby position toward the load applying position to apply a load to the target and moves into a predetermined zone immediately before the position where the clearance between the linear moving member and the target becomes zero.