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US 12,738,781 B2Granted
ESM with reduced torque ripple
AssigneeAudi AG
InventorFlorian Bittner
Life of this patent
Estimating the term…
Abstract
Provided is an externally excited synchronous machine (ESM) with reduced torque ripple, a rotor designed for the excited synchronous machine, and a method for production of the rotor.
Claims11
A rotor for an externally excited synchronous machine, comprising:
- pole shoes having an outer contour composed of straight line segments, the ends of which are situated on a line corresponding to a sine field pole contour,
- wherein a respective winding is wrapped around each pole shoe of the pole shoes,
- wherein the sine field pole contour is defined by:
- R
- 2
- =
- F
- 0
- cos
-
- (
- p
- ·
- φ
- )
- +
- R
- 1
- 2
-
- p
- +
- F
- 0
- 2
- cos
- 2
-
- (
- p
- ·
- φ
- )
-
- ;
- and
- F
- 0
- =
- (
- R
- 1
- -
- δ
- min
- )
- 2
-
- p
- -
- R
- 1
- 2
-
- p
- 2
-
- (
- R
- 1
- -
- δ
- min
- )
- p
- ,
- and
- wherein:
- R2=an outer radius of the rotor;
- p=a number of pole pairs present in the rotor;
- φ=an angle between a center axis of the pole and a connection line between a midpoint of the rotor and a respective point on the sine field pole contour;
- R1=a borehole radius of the rotor;
- and
- δmin=a minimum air gap between the pole shoes and a stator.
71 more elements
A rotor for an externally excited synchronous machine, comprising:
- pole shoes having an outer contour composed of straight line segments, the ends of which are situated on a line corresponding to a sine field pole contour,
- wherein the sine field pole contour is defined by:
- R
- 2
- =
- F
- 0
- cos
-
- (
- p
- ·
- φ
- )
- +
- R
- 1
- 2
-
- p
- +
- F
- 0
- 2
- cos
- 2
-
- (
- p
- ·
- φ
- )
-
- ;
- and
- F
- 0
- =
- (
- R
- 1
- -
- δ
- min
- )
- 2
-
- p
- -
- R
- 1
- 2
-
- p
- 2
-
- (
- R
- 1
- -
- δ
- min
- )
- p
- ,
- and
- wherein:
- R2=an outer radius of the rotor;
- p=a number of pole pairs present in the rotor;
- φ=an angle between a center axis of the pole and a connection line between a midpoint of the rotor and a respective point on the sine field pole contour;
- R1=a borehole radius of the rotor;
- and
- δmin=a minimum air gap between the pole shoes and a stator.
70 more elements
A method for producing a rotor, the method comprising:
- punching sheet metal slats out with a punch tool, the punch tool adapted to give pole shoes of the sheet metal slats an outer contour composed of straight line segments, the ends of which are situated on a line corresponding to a sine field pole contour,
- wherein a respective winding is wrapped around each pole shoe of the pole shoes,
- wherein the sine field pole contour is defined by:
- R
- 2
- =
- F
- 0
- cos
-
- (
- p
- ·
- φ
- )
- +
- R
- 1
- 2
-
- p
- +
- F
- 0
- 2
- cos
- 2
-
- (
- p
- ·
- φ
- )
-
- ;
- and
- F
- 0
- =
- (
- R
- 1
- -
- δ
- min
- )
- 2
-
- p
- -
- R
- 1
- 2
-
- p
- 2
-
- (
- R
- 1
- -
- δ
- min
- )
- p
- ,
- and
- wherein:
- R2=an outer radius of the rotor;
- p=a number of pole pairs present in the rotor;
- φ=an angle between a center axis of the pole and a connection line between a midpoint of the rotor and a respective point on the sine field pole contour;
- R1=a borehole radius of the rotor;
- and
- δmin=a minimum air gap between the pole shoes and a stator.
71 more elements
Dependencies are inferred from the claim text.