# US 2006/0220473 A1 · Linear motor and process for manufacturing the same, linear compressor, and stirling engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0220473 A1 - Document ID: US20060220473A1 - Status: Published application - Kind: A1 - Application number: 10/553,384 - Filed: 2004-06-08 - Published: 2006-10-05 - Earliest claimed: 2003-06-16 - Inventors: Kazuhiko Ueda - Web page: https://patentgrep.com/patent/US20060220473A1 ## CPC - H02K 1/18: Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures - H02K 33/16: with polarised armatures moving in alternate directions by reversal or energisation of a single coil system - F02G 2280/10: Linear generators - H02K 1/141: {consisting of C-shaped cores} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR ## Abstract A linear motor device includes an inner yoke, an outer yoke, a coil-wound body and a movable magnet portion, first and second clamp rings for clamping the outer yoke, and a spacer for coupling the first and second clamp rings at a given spacing. The movable magnet portion drives a piston reciprocating in a cylinder. The first clamping member is provided with a support portion for supporting a spring for pushing the piston. The second clamping member is fixed directly or indirectly to the cylinder. A linear compressor and a Stirling engine include the above-described linear motor device. ## Claims ### Claim 1 A linear motor device, comprising: an inner yoke; an outer yoke located outside said inner yoke; a coil-wound body and a movable magnet portion for driving a piston reciprocating in a cylinder, both located between said inner yoke and said outer yoke; first and second clamping members for clamping said outer yoke; and a spacer for coupling said first and second clamping members at a given spacing, said first clamping member being provided with a support portion supporting a spring for pushing said piston, and said second clamping member being fixed directly or indirectly to said cylinder. ### Claim 2 (depends on 1) The linear motor device according to claim 1, wherein said spacer has axial end faces and smaller-diameter portions protruding from said axial end faces at both ends, and said first and second clamping members have first and second receiving portions having concave portions for receiving the smaller-diameter portions of said spacer and support surfaces for supporting said axial end faces of said spacer. ### Claim 3 (depends on 1) The linear motor device according to claim 1, wherein said outer yoke is made of a plurality of outer yoke blocks arranged in a circumferential direction of said first and second clamping members, the outer yoke blocks being separated in a longitudinal direction of said spacer, and said outer yoke blocks are bonded to said first and second clamping members with welded portions interposed therebetween. ### Claim 4 A method for manufacturing a linear motor device, comprising the steps of: fixing a first outer yoke block and a second outer yoke block to a first clamping member and a second clamping member, respectively, by ultrasonic welding; while said first and second outer yoke blocks are fixed to said first and second clamping members, coupling said first and second clamping members together by ultrasonic welding with a spacer interposed therebetween,; fixing said first and second outer yoke blocks to each other. ### Claim 5 (depends on 4) The method of manufacturing a linear motor device according to claim 4, wherein said first and second clamping members are coupled together with a gap provided between said first and second outer yoke blocks. ### Claim 6 (depends on 1) A linear compressor comprising the linear motor device recited in claim 1. ### Claim 7 A linear compressor, comprising: a cylinder provided in a casing; a piston reciprocating in said cylinder; a linear motor device provided in an outer periphery of said cylinder to drive said piston; and a spring for pushing said piston, said linear motor device having an inner yoke, an outer yoke located outside said inner yoke, a coil-wound body and a movable magnet portion located between said inner yoke and said outer yoke, first and second clamping members for clamping said outer yoke, a spacer for coupling said first and second clamping members at a given spacing, and a support portion for supporting said spring, said first clamping member being provided with said support portion, and said second clamping member being mounted to said cylinder. ### Claim 8 A Stirling engine, comprising: a cylinder provided in a casing; a piston and a displacer reciprocating in said cylinder; a linear motor device provided in an outer periphery of said cylinder for allowing said piston to reciprocate in said cylinder; and a spring for pushing the displacer, said linear motor device having an inner yoke, an outer yoke located outside said inner yoke, a coil-wound body and a movable magnet portion located between said inner yoke and said outer yoke, first and second clamping members, for clamping said outer yoke, a spacer for coupling said first and second clamping members at a given spacing, and a support portion for supporting said spring, said first clamping member being provided with said support portion, and said second clamping member being mounted to said cylinder.