# US 2019/0356207 A1 · Linear motor and compressor

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- Number: US 2019/0356207 A1
- Document ID: US20190356207A1
- Status: Published application
- Kind: A1
- Application number: 16/476,340
- Filed: 2017-10-25
- Published: 2019-11-21
- Earliest claimed: 2017-01-13
- Assignees: Hitachi Automotive Systems, Ltd.; Hitachi Industrial Equipment Systems Co., Ltd.
- Applicants: Hitachi Automotive Systems, Ltd.; Hitachi Industrial Equipment Systems Co., Ltd.
- Inventors: Masaki KOYAMA; Shuhei NAGATA; Naoyuki OOHATA; Kan KOBAYASHI; Yoshinori KAWAI
- Web page: https://patentgrep.com/patent/US20190356207A1

## CPC

- H02K 33/06: with polarised armatures
- H02K 33/12: with armatures moving in alternate directions by alternate energisation of two coil systems
- F04B 35/04: the means being electric
- F04B 35/045: {using solenoids}
- H02K 33/02: with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
- H02K 41/031: {of the permanent magnet type}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

An object of the present invention is to provide a linear motor and a compressor which are effective against a non-fixed structure in which end portions of a resonant spring are not fixed and are capable of restraining loads in an up-down direction and a left-right direction which act on a slider. A linear motor includes a slider (2) which is driven in a first direction, a resonance spring (400) which is capable of vibrating in the first direction, and a permanent magnet (210) which is provided at the slider (2) and is magnetized in a second direction perpendicular to the first direction. The linear motor includes a bearing (480) that is movable against both forces of a force in the second direction and a force in a third direction perpendicular to the first direction and the second direction, and an elastic-body support member (450) which connects the resonant spring (400) and the bearing (480) to each other.

## Claims

### Claim 1

A linear motor that includes a slider driven in a first direction, resonant springs capable of vibrating in the first direction, and a permanent magnet which is provided at the slider and is magnetized in a second direction perpendicular to the first direction, the linear motor comprising:
a bearing that is movable against both of a force in the second direction and a force in a third direction perpendicular to the first direction and the second direction; and
an elastic-body support member that connects the resonant spring and the bearing to each other.

### Claim 2 (depends on 1)

The linear motor according to claim 1,
wherein the resonant spring is held by the elastic-body support member in a contraction state, and is held by the elastic-body support member so as to be detachable from the elastic-body support member through cancelation of the contraction state using the elastic-body support member.

### Claim 3 (depends on 1)

The linear motor according to claim 1,
wherein the slider is capable of reciprocating in the first direction,
magnetic poles and windings provided on both sides of the slider are provided in the second direction, and
the resonant springs are provided on both sides of the bearing in the second direction.

### Claim 4 (depends on 1)

The linear motor according to claim 1,
wherein the bearing includes a first bearing which is movable by the force in the second direction and a second bearing which is movable by the force in the third direction.

### Claim 5 (depends on 1)

The linear motor according to claim 1,
wherein a part or all of the resonant springs are coil springs,
the coil spring includes a first coil spring and a second coil spring which are wound in two directions different from each other, and
the second coil spring is arranged on an inner circumferential side of the first coil spring.

### Claim 6 (depends on 1)

A compressor comprising:
a cylinder;
a piston that reciprocates inside the cylinder; and
the linear motor according to claim 1, as a driving motor that drives the piston,
wherein the bearing and the resonant spring are arranged on one side of the slider, and the piston is arranged on an other side of the slider.