# US 2017/0288477 A1 · Unsaturated polyester resin composition and switched reluctance motor

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- Number: US 2017/0288477 A1
- Document ID: US20170288477A1
- Status: Published application
- Kind: A1
- Application number: 15/511,274
- Filed: 2015-08-26
- Published: 2017-10-05
- Earliest claimed: 2014-11-17
- Assignees: Showa Denko K.K.
- Applicants: Showa Denko K.K.
- Inventors: Ryujin ISHIUCHI
- Web page: https://patentgrep.com/patent/US20170288477A1

## CPC

- H02K 1/04: characterised by the material used for insulating the magnetic circuit or parts thereof
- C08K 3/00: Use of inorganic substances as compounding ingredients
- C08K 3/22: of metals
- C08K 3/26: Carbonates; Bicarbonates
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08K 3/40: Glass
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 7/02: Fibres or whiskers
- C08K 7/14: Glass
- C08L 67/06: Unsaturated polyesters
- H01F 5/06: Insulation of windings
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/48: in slots
- C08K 2003/2227: {of aluminium}
- C08K 2003/2237: {of titanium}
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08K 2003/3045: {Sulfates}
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

The present invention provides an unsaturated polyester resin composition for producing a molding resin for use in a switched reluctance motor. The unsaturated polyester resin composition comprises an unsaturated polyester, a crosslinking agent, a curing agent, a low profile additive, a filler, and a reinforcing fibrous material. The content of the filler is from 100 parts by mass to 800 parts by mass with respect to 140 parts by mass of the total of the unsaturated polyester and the crosslinking agent. The filler comprises one or more fillers (filler A) selected from the group consisting of calcium carbonate, glass, silica, talc, clay, barium sulfate, calcium silicate, titanium oxide, and a hollow filler and one or more fillers (filler B) selected from the group consisting of aluminum hydroxide and alumina. The mass ratio of filler B to filler A is 1 or more. The unsaturated polyester resin composition of the present invention is optimal for producing a molding resin for use in a switched reluctance motor, the molding resin barely causing void formation upon sealing, effectively preventing vibration of stator salient poles, and barely generating cracks when vibration and heat are generated during motor operation.

## Claims

### Claim 1

An unsaturated polyester resin composition for producing a molding resin for use in a switched reluctance motor, the unsaturated polyester resin composition comprising:
an unsaturated polyester;
a crosslinking agent;
a curing agent;
a low profile additive;
a filler; and
a reinforcing fibrous material,
content of the filler being from 200 parts by mass to 800 parts by mass with respect to 140 parts by mass of the total of the unsaturated polyester and the crosslinking agent,
the filler comprising one or more fillers (filler A) selected from the group consisting of calcium carbonate, glass, silica, talc, clay, barium sulfate, calcium silicate, titanium oxide, and a hollow filler and one or more fillers (filler B) selected from the group consisting of aluminum hydroxide and alumina,
mass ratio of filler B to filler A being 1 or more.

### Claim 2 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein the mass ratio of filler B to filler A is from 1 to 100.

### Claim 3 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein content of the reinforcing fibrous material is from 10 parts by mass to 130 parts by mass with respect to 140 parts by mass of the total of the unsaturated polyester and the crosslinking agent.

### Claim 4 (depends on 1)

A switched reluctance motor, comprising space between adjacent stator salient poles sealed with the unsaturated polyester resin composition according to claim 1.