Sensorless electric machine

Patent metadata

Field	Value
Publication number	US-9871418-B2
Application number	US-201514974848-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Nov 1, 2012
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

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 having a shifted-ring configuration, comprising:
a rotor core;
a plurality of openings disposed within the rotor core;
a plurality of permanent magnets disposed in the plurality of openings in such a way so as to define a remaining opening at each end of each of the plurality of permanent magnets; and
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 is 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 IPM or SRM, and wherein a portion of the rotor circuit structure and the plurality of permanent magnets are disposed in the same plurality of openings;

a plurality of rotor bars disposed in one or more of the plurality of remaining openings; and
a plurality of connection elements disposed in one or more of the plurality of remaining openings,
wherein rotor bars from adjacent poles are co-located in one of the plurality of remaining openings.

2. An electric machine having a shifted-ring configuration, comprising:
a rotor core;
a stator configured with a plurality of stationary windings therein;
a plurality of openings disposed within the rotor core;
a plurality of permanent magnets disposed in the plurality of openings in such a way so as to define a remaining opening at each end of each of the plurality of permanent magnets; and
a rotor circuit structure comprising at least one pole circuit including a plurality of rotor connectors inserted into the remaining opening of at each end of the permanent magnet and connected by a plurality of connection elements and 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, and wherein rotor connectors from adjacent poles are co-located in one of the plurality of remaining openings.

3. The electric machine in claim 2 , wherein the plurality of magnets are disposed in a plurality of rows.

4. An electric machine having a shifted-ring configuration comprising:
a rotor core;
a stator configured with a plurality of stationary windings therein;
a first plurality of openings disposed within the rotor core;
a plurality of magnets disposed in the first plurality of openings in such a way so as to define a remaining opening at each end of each of the plurality of permanent magnets;
a rotatable shaft therethrough; and
a rotor circuit structure comprising at least one loop or ring of a conductive, non-magnetic material and including a plurality of rotor bars disposed in one or more of the plurality of remaining openings, a plurality of connection elements disposed in one or more of the plurality of remaining openings, wherein rotor bars from adjacent poles are co-located in one of the plurality of remaining openings, and wherein said at least one loop or ring is substantially concentric about a d-axis of the electric machine, and wherein a portion of the rotor circuit structure.

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

6. The electric machine in claim 4 , the rotor core further comprising a 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

• 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

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K21/46

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

• H02K1/276

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