# US 2021/0281128 A1 · Pump for water-conducting home appliances

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- Number: US 2021/0281128 A1
- Document ID: US20210281128A1
- Status: Published application
- Kind: A1
- Application number: 17/189,110
- Filed: 2021-03-01
- Published: 2021-09-09
- Earliest claimed: 2020-03-03
- Assignees: Bleckmann GmbH & Co. KG
- Applicants: Bleckmann GmbH & Co. KG
- Inventors: Heinz Frederic Hackl; Hubert Unterberger; Andreas Pleschinger
- Web page: https://patentgrep.com/patent/US20210281128A1

## CPC

- H02K 1/148: {Sectional cores (H02K1/141 takes precedence)}
- H02K 3/522: {for generally annular cores with salient poles}
- D06F 39/085: {Arrangements or adaptations of pumps}
- F04D 13/064: {Details of the magnetic circuit}
- F04D 13/0693: {Details or arrangements of the wiring}
- F04D 29/628: {especially adapted for liquid pumps}
- H02K 1/146: {consisting of a generally annular yoke with salient poles}
- H02K 1/246: {Variable reluctance rotors}
- H02K 19/103: {Motors having windings on the stator and a variable reluctance soft-iron rotor without windings}
- A47L 15/4225: {Arrangements or adaption of recirculation or discharge pumps}
- H02K 1/2733: Annular magnets
- H02K 5/128: using air-gap sleeves or air-gap discs
- H02K 2203/12: Machines characterised by the bobbins for supporting the windings
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)

## Abstract

A pump for a water-conducting appliance, the pump having an electric motor comprising: a rotor comprising a ferrite body with at least four magnetic poles, wherein the ferrite body has a lateral-circumferential magnetization; and a stator comprising a pole chain made of a stack of a plurality of straight transformer sheets and rounded to a circular configuration by bending the stacked transformer sheets, wherein the pole chain has a plurality of pole portions each comprising a pole tooth; and a plurality of winding cores attached to the respective pole teeth for accommodating coils of a three-phase winding comprising wires; wherein the wires of respective phases of the three-phase winding are routed spatially separated from each other and without mutual contact at an axial end surface of the pole chain between and along adjacent winding cores around the pole chain; and wherein the wires are supported and guided such that their positions relative to the pole chain are substantially maintained when the pole chain is rounded from its straight configuration to its circular configuration.

## Claims

### Claim 1

A pump for a water-conducting appliance, in particular a home appliance such as a dishwasher or a washing machine, having an electric motor comprising:
a rotor comprising a ferrite body with at least four magnetic poles, wherein the ferrite body has a lateral-circumferential magnetization;
a stator comprising:
a pole chain made of a stack of a plurality of straight transformer sheets and rounded to a circular configuration by bending the stacked transformer sheets, wherein the pole chain has a plurality of pole portions each comprising a pole tooth; and
a plurality of winding cores attached to the respective pole teeth for accommodating coils of a three-phase winding comprising wires;
wherein the wires of respective phases of the three-phase winding are routed spatially separated from each other and without mutual contact at an axial end surface of the pole chain between and along adjacent winding cores around the pole chain; and
wherein the wires are supported and guided such that their positions relative to the pole chain are substantially maintained when the pole chain is rounded from its straight configuration to its circular configuration.

### Claim 2 (depends on 1)

The pump according to claim 1,
wherein the ferrite body comprises at least one mechanically stabilizing additive, such as manganese, cobalt or lanthanum, and is preferably made of one piece.

### Claim 3 (depends on 1)

The pump according to claim 1,
wherein the wires are routed in three axially separated routing planes having different axial levels along the axis of the rounded pole chain, wherein each wire is routed substantially in a respective one of the routing planes.

### Claim 4 (depends on 1)

The pump according to claim 1,
wherein each winding core further comprises support means configured to support and guide the respective wire to a respective one of the separated routing planes when entering or exiting the coil on the winding core.

### Claim 5 (depends on 1)

The pump according to claim 1,
wherein each winding core further comprises support divider means which are formed as a recess in a coil space boundary wall of the winding core, the recess having a depth which is set so that a bottom line of the recess is located at the axial level of one of the routing planes.

### Claim 6 (depends on 5)

The pump according to claim 5,
wherein at least one support divider means further comprises a winding gradation means.

### Claim 7 (depends on 1)

The pump according to claim 1,
wherein the winding core further comprises a winding displacement means located at an inner side wall of the coil space of the winding core.

### Claim 8 (depends on 1)

The pump according to claim 1,
wherein each winding core further comprises support pins which are configured to support and guide wires from one winding core to adjacent winding cores along spatially separated routing paths,
wherein the support pins are preferably configured to support and guide wires from one winding core to adjacent winding cores in axially separated routing planes.

### Claim 9 (depends on 8)

The pump according to claim 8,
wherein the support pins comprise shoulders or recesses to support the wires and prevent axial movement of the wires.

### Claim 10 (depends on 1)

The pump according to claim 1,
wherein a lateral side wall of a coil space of the winding core facing in circumferential direction of the stator has an inclination angle larger than an inclination angle of the narrow side of the coil space facing in axial direction of the stator, wherein a difference between the angles is preferably set to 5° to 25°, and more preferably set to 10° to 15°.

### Claim 11 (depends on 1)

The pump according to claim 1,
wherein the wires are enameled wires made from aluminum or aluminum alloy.

### Claim 12 (depends on 1)

The pump according to claim 1,
wherein each single magnetic pole at the outer circumferential surface of the ferrite body is circumferentially aligned with a catch provided at the outer circumferential surface of a rotor core element carrying ferrite body.

### Claim 13 (depends on 1)

The pump according to claim 1,
wherein the pump further comprises a housing element having a rotor can located between rotor and stator, wherein the housing element comprises longitudinally extending fins at the outer surface of the rotor can.

### Claim 14 (depends on 13)

The pump according to claim 13,
wherein the housing element comprises as plurality of guiding projections protruding radially inwardly from a cylindrical wall of housing element and extending in axial direction and being configured to be accommodated in complementary engagement grooves formed at outer circumferential surface of pole chain.

### Claim 15 (depends on 14)

The pump according to claim 14,
wherein at least one guiding projection has a different size or shape than the other guiding projections to prevent pole chain from being mounted in a wrong circumferential orientation.