# US 11,444,511 B2 · Vibration damping device and electrically driven actuator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,511 B2 - Document ID: US11444511B2 - Status: Granted - Kind: B2 - Application number: 17/274,863 - Filed: 2019-04-15 - Published: 2022-02-24 - Granted: 2022-09-13 - Earliest claimed: 2018-09-14 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Yuki Morisaki; Yasuhiro Saiki; Kenichi Oyama - Web page: https://patentgrep.com/patent/US11444511B2 ## CPC - B06B 1/045: {using vibrating magnet, armature or coil system} - H02K 5/24: specially adapted for suppression or reduction of noise or vibrations - B06B 1/08: operating with magnetostriction (magnetostrictive devices per se H10N30/00) - B64C 13/28: mechanical - B64C 13/50: using electrical energy - F16F 15/002: {characterised by the control method or circuitry (control of mechanical oscillations per se G05D19/00)} - F16F 15/005: {using electro- or magnetostrictive actuation means (generating of mechanical vibrations operating with electrostriction B06B1/06, with magnetostriction B06B1/08; vehicle suspension arrangements characterised by use of piezoelectric elements B60G17/01941; piezoelectric, electrostrictive and magnetostrictive devices per se H10N30/00)} - F16H 25/20: Screw mechanisms (with automatic reversal F16H25/12) - F16H 25/24: Elements essential to such mechanisms, e.g. screws, nuts (F16H25/22 takes precedence) - H02K 7/06: Means for converting reciprocating motion into rotary motion or vice versa - B06B 1/06: operating with piezoelectric effect or with electrostriction (piezoelectric or electrostrictive devices per se H10N30/00) - F16F 2222/06: Magnetic or electromagnetic - F16F 2228/066: Variable stiffness - F16F 2230/18: Control arrangements - F16H 2025/2031: {Actuator casings} - F16H 2025/2075: {Coaxial drive motors} - B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - B64C: AEROPLANES; HELICOPTERS - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - F16H: GEARING ## Abstract An electrically driven actuator includes a vibration damping device; and an electrically driven unit operated by using electricity. The vibration damping device includes a vibration absorbing unit provided between a first support and a second support provided to face the first support, and expanding and contracting by using electricity, a measurement unit that measures vibrations of the second support, and a control unit that electrically controls the vibration absorbing unit to cancel the vibrations of the second support which are measured by the measurement unit. The electrically driven unit includes a housing provided on a fixed side, a shaft movable in an axial direction which is a direction toward a movable side opposite to the fixed side with respect to the housing, and a drive unit provided between the housing and the shaft, and driving the shaft with respect to the housing. ## Claims ### Claim 1 An electrically driven actuator between a fixed side and a movable side of an aircraft and moving linearly in an axial direction which is a direction toward the movable side opposite to the fixed side comprising: a vibration damping device; and an electrically driven unit operated by using electricity, wherein the vibration damping device includes a vibration absorbing unit provided between a first support and a second support provided to face the first support, and expanding and contracting by using electricity, a measurement unit that measures vibrations of the second support, and a control unit that electrically controls the vibration absorbing unit to cancel the vibrations of the second support which are measured by the measurement unit, and wherein the electrically driven unit includes a housing provided on a fixed side, a shaft movable in the axial direction which is a direction toward a movable side opposite to the fixed side with respect to the housing, and a drive unit provided between the housing and the shaft, and driving the shaft with respect to the housing. ### Claim 2 (depends on 1) The electrically driven actuator according to claim 1, wherein the drive unit includes a screw shaft connected to the housing, and rotating around an axis, a nut attached to the screw shaft, and a drive source that drives rotation of the screw shaft, and the shaft is fixed to the nut, and linearly moves in the axial direction via the nut by the rotation of the screw shaft. ### Claim 3 (depends on 1) The electrically driven actuator according to claim 1, wherein the shaft includes a first shaft and a second shaft movable in the axial direction with respect to the first shaft, the first support includes the first shaft, the second support includes the second shaft, and the vibration absorbing unit is provided between the first shaft and the second shaft. ### Claim 4 (depends on 1) The electrically driven actuator according to claim 1, wherein the shaft includes a first shaft and a second shaft movable in the axial direction with respect to the first shaft, the first support includes the drive unit, the second support includes the second shaft, and the vibration absorbing unit includes the first shaft provided between the drive unit and the second shaft. ### Claim 5 (depends on 1) The electrically driven actuator according to claim 1, wherein the first support includes the housing, the second support includes the drive unit, and the vibration absorbing unit is provided between the housing and the drive unit. ### Claim 6 (depends on 1) The electrically driven actuator according to claim 1, wherein the vibration absorbing unit includes a magnetostrictive member that connects the first support and the second support to each other, and at least one coil provided on an outer periphery of the magnetostrictive member whose axial direction is set to a direction in which the first support and the second support face each other, and the control unit controls a current flowing through the coil. ### Claim 7 (depends on 6) The electrically driven actuator according to claim 6, wherein a plurality of the coils are provided to be aligned in the axial direction. ### Claim 8 (depends on 1) The electrically driven actuator according to claim 1, wherein the vibration absorbing unit includes an electrostrictive member that connects the first support and the second support to each other, and the control unit controls a voltage applied to the electrostrictive member. ### Claim 9 (depends on 8) The electrically driven actuator according to claim 8, wherein the electrostrictive member is a laminate obtained by laminating a plurality of the electrostrictive members in a direction in which the first support and the second support face each other.