Sensorless electric machine

Patent metadata

Field	Value
Publication number	US-2016105064-A1
Application number	US-201514974848-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Nov 1, 2012
Publication date	Apr 14, 2016
Grant date	—

Abstract

A rotor component that comprises a rotor circuit configured for use with either an interior permanent magnet (IPM) machine or a synchronous reluctance machine (SRM) that includes a pole circuit made of a conductive, non-magnetic material and has a midpoint that substantially aligns with a d-axis of the IPM or SRM. An electric machine with a similar rotor component therein or having a loop or ring of a conductive, non-magnetic material that is substantially concentric about a d-axis of the electric machine.

First claim

What is claimed is:

1 . A rotor component comprising:
a rotor circuit configured for use with one of an interior permanent magnet (IPM) machine and a synchronous reluctance machine (SRM), the rotor circuit comprising:
at least one pole circuit, wherein the at least one pole circuit are made of a conductive, non-magnetic material and a midpoint of the least one pole circuit substantially aligns with a d-axis of the IPM or SRM.

2 . An electric machine comprising:
a rotor core; a stator configured with a plurality of stationary windings therein; a plurality of openings disposed within the rotor core; and a rotor circuit structure comprising at least one pole circuit disposed in a predetermined location, wherein said predetermined location is such that a midpoint of the least one pole circuit substantially aligns with a d-axis of the electric machine.

3 . The electric machine in claim 2 , further comprising a plurality of magnets collocated in the plurality of openings.

4 . The electric machine in claim 3 , wherein the plurality of magnets are disposed in a plurality of rows.

5 . The electric machine in claim 3 , wherein the rotor circuit structure is collocated with the plurality of magnets in the plurality of openings.

6 . The electric machine in claim 3 , wherein the rotor circuit structure and the plurality of magnets are located in different openings of the plurality of openings, thereby defining a lamination bridge between the rotor circuit structure and the plurality of magnets.

7 . The electric machine in claim 2 , the rotor core further comprising a second plurality of openings disposed on an exterior of the rotor core.

8 . The electric machine in claim 7 , wherein the second plurality of openings comprise one of a groove, a slot, and a recess.

9 . The electric machine in claim 7 , wherein a portion of the at least one pole circuit is disposed in the second plurality of openings.

10 . An electric machine comprising:
a rotor core; a stator configured with a plurality of stationary windings therein; a plurality of openings disposed within the rotor core; a rotatable shaft therethrough; and a rotor circuit structure comprising at least one loop or ring of a conductive, non-magnetic material, wherein said at least one loop or ring is substantially concentric about a d-axis of the electric machine.

11 . The electric machine of claim 10 , further comprising a plurality of magnets disposed in the plurality of openings.

12 . The electric machine of claim 11 , wherein the plurality of magnets are disposed in a plurality of rows.

13 . The electric machine in claim 12 , wherein the rotor circuit structure is collocated with the plurality of magnets in the plurality of openings.

14 . The electric machine in claim 10 , the rotor core further comprising a second plurality of openings.

15 . The electric machine of claim 14 , wherein the second plurality of openings are disposed on an exterior of the rotor core.

16 . The electric machine of claim 15 , wherein the second plurality of openings comprise one of a groove, a slot, and a recess.

17 . The electric machine of claim 14 , the rotor circuit structure disposed in the second plurality of openings and not collocated with the plurality of magnets, thereby defining a lamination bridge between the plurality of openings and the second plurality of openings.

18 . The electric machine of claim 14 , wherein a portion of the rotor circuit structure is disposed in the second plurality of openings.

Assignees

• Gen Electric

Inventors

• Huh Kum Kang
• Reddy Patel Bhageerath
• El-Refaie Ayman Mohamed Fawzi
• Jansen Patrick Lee
• Schultz Roy David
• Salasoo Lembit

Classifications

• H02K21/46

  Motors having additional short-circuited winding for starting as an asynchronous motor · CPC title

• H02K29/12

  using detecting coils {using the machine windings as detecting coil} · CPC title

• H02K1/223

  Rotor cores with windings and permanent magnets (for additional excitation in synchronous motors or generators H02K21/042; in synchronous motors having additional short-circuited winding for starting as an asynchronous motor H02K21/46) · CPC title

• H02K1/276

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K1/246 Primary

  Variable reluctance rotors · CPC title