US 2021/0332906 A1Published application

Actuator and compact egr valve

AssigneeStanadyne, Inc.

InventorsNicola Fachechi, Paul D. Free, Walter A. Hoemann

Life of this patent

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Abstract

An actuator is driven by a brushless motor having a rotor with axially extended magnets, permitting axial movement of the rotor while maintaining overlap between the magnets and a stator secured in a fixed position. The rotor is engaged with a fixed structure by a connection such as a ramp or thread that translates rotation into axial movement of the rotor along a rotational axis of the actuator. A valve member coupled to the rotor moves axially between a closed position and a range of positions that regulate fluid flow through a valve. A motor control circuit applies power to the stator coils to rotate the rotor and coupled valve member to a desired axial position and maintain the rotor and valve member at the selected position. The rotor and valve member may be biased toward a rotational position corresponding to a closed position of the valve member.

Claims20

Dependent claims

An actuator comprising:

a housing having a first end, and a second end;
a stator supported within said housing at a fixed axial and rotational position adjacent the first end of said housing, said stator including a plurality of stator coils of a first axial length;
a rotor including a plurality of magnets arranged to rotate relative to said stator, said plurality of magnets having a second axial length greater than the first axial length of said stator, said rotor including a ramp or thread engaged with a complementary ramp or thread fixed to said housing;
and
a motor control circuit arranged to apply electrical power to said plurality of stator coils in a pattern that generates a magnetic field that exerts torque on the plurality of magnets in the rotor,
wherein said torque rotates the rotor within said housing, said ramp or thread translating rotation of said rotor in a first direction into movement of the rotor in a first axial direction and rotation of the rotor in a second direction moving the rotor in a second axial direction within the housing, said magnets spanning the first axial length of the stator at all axial positions of said rotor.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/147,765Filed 13 Jan 2021
Priority: 22 Apr 2020
Published: 28 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

F16K 31/042
For rotating valves: with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
H02K 5/15
Casings or enclosures characterised by the shape, form or construction thereof: mounting arrangements for bearing-shields or end plates
F02M 26/54
Using electric actuators, e.g. solenoids: rotary actuators, e.g. step motors
F02M 26/70
Constructional details of EGR valves: flap valves; Rotary valves; Sliding valves; Resilient valves

Family

Application63/013,769Us provisional application · filed 22 Apr 2020
US 11,603,945 B2Related patent
US 2021/0332906 A1This patent

From the US filing history. Foreign family members aren’t listed.

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