ELECTRIC LINEAR ACTUATOR

WIPO Patent Application WO/2022/270382

A1

Provided is an electric linear actuator in which discontinuous stiffness caused on the basis of the gear ratio of a transmission mechanism is taken into consideration to enable driving of an electric motor with high precision. An electric linear actuator comprises: an electric motor (510); a linear motion mechanism (520); a control device (100) that controls a load which is applied to an object by the linear motion mechanism through a linear motion thereof as the electric motor is driven; and a transmission mechanism (580) having a speed changing function wherein a corresponding relationship between the amount of linear motion and the amount of rotation of the electric motor changes at a predetermined load. The control device has: an estimator (130) that estimates a load applied by the linear motion mechanism; a load controller (113) that uses a control gain, by which a deviation or the like between an estimated value and a target value of the load is multiplied, for a control computation, and that, in a state in which the estimated value or the like of the load is not zero, uses, at least at one point, a control gain varying discontinuously with respect to transition of at least one of the estimated value and the target value of the load, to calculate a motor drive amount; and a control gain adjustment unit (115) that adjusts the control gain.

MASUDA YUI (JP)

PCT/JP2022/023986

December 29, 2022

June 15, 2022

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NTN TOYO BEARING CO LTD (JP)

B60T13/74; B60T8/17; H02P29/40

WO2019151146A1	2019-08-08
WO2019132022A1	2019-07-04

JP2009001151A	2009-01-08
JP2019018693A	2019-02-07

SUGIMOTO, Shuji et al. (JP)

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