Rotor of electric machine and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10686343-B2
Application number	US-201615771316-A
Country	US
Kind code	B2
Filing date	Jul 1, 2016
Priority date	Oct 27, 2015
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A stack of a rotor comprises a plurality of stack elements which include material of first magnetic conductance. The rotor includes sectorial sections distributed round a rotational axis of the rotor. Each of the stack elements has an aperture of second magnetic conductance in each of the sectorial sections. Outer ends of the apertures are located at a rim of the stack elements or at a bridge of the rim. The apertures form channels through the stack in a direction of a rotational axis of the rotor. At least two of the apertures of a common channel of the channels have the outer ends at different radial distances from the rotational axis of the rotor.

First claim

The invention claimed is:

1. A rotor of an electric machine, wherein a stack of the rotor comprises a plurality of stack elements which comprise material of first magnetic conductance;
the rotor comprises a plurality of sectorial sections distributed round a rotational axis of the rotor;
each of the stack elements has an aperture of second magnetic conductance in each of the sectorial sections;
the apertures of the plurality of the stack elements are configured to form a plurality of channels through the stack in a direction of an rotational axis of the rotor;
the apertures with or without filling configured to provide an electromagnetic response in the operating rotor, wherein outer ends of the apertures are located at a rim of the stack elements or at a bridge of the rim; and
at least two of the apertures of a common channel of the plurality of the channels are of different sizes and configured to have the outer ends at different radial distances from the rotational axis of the rotor, and one end of an aperture of the apertures has a bridge at the rim and other end of said aperture of the apertures has no bridge at the rim.

2. The rotor of claim 1 , wherein one or more of the stack elements are configured to have eccentric shaft holes for the outer ends to be at the different radial distances from the rotational axis.

3. The rotor of claim 1 , wherein outer ends of at least two of the apertures of any common channel of the plurality of the channels have different radial distances from the rotational axis of the rotor.

4. The rotor of claim 1 , wherein at least two of the stack elements have shaft holes geometric centers of which deviate from each other for at least two of the apertures of the common channel of the plurality of the channels to have the outer ends at different radial distances from the rotational axis of the rotor.

5. The rotor of claim 1 , wherein every fourth stack element has the outer ends at different radial distances from the rotational axis of the rotor from those of other stack elements.

6. The rotor of claim 5 , wherein any two of the stack elements, which are directly adjacent to each other in the stack and which are identical, are rotationally shifted with each other by an angle between two of said sectorial sections which are directly adjacent.

7. The rotor of claim 1 , wherein the channels formed by the apertures of the stacked elements comprise solid material of the second magnetic conductance.

8. The rotor of claim 1 , wherein the aperture is configured to provide an electromagnetic response in the rotor for an operation of the machine on the basis of a magnetic conductance difference between the first magnetic conductance and the second magnetic conductance.

9. A method of manufacturing a rotor of an electric machine, the method comprising
forming, in each of stack elements of a stack of the rotor, a plurality of apertures in sectorial sections distributed round a rotational axis of the rotor, the apertures with or without filling providing an electromagnetic response in the operating rotor;
forming, by the plurality of the apertures of the plurality of the stack elements, a plurality of channels through the stack in a direction of an rotational axis of the rotor; and
locating outer ends of at least two of the apertures, which are of different sizes and of a common channel of the plurality of the channels, at different radial distances from the rotational axis of the rotor at a rim of the stack elements or at a bridge of the rim, and one end of an aperture of the apertures has a bridge at the rim and other end of said aperture of the apertures has no bridge at the rim.

Assignees

• Abb Schweiz Ag

Inventors

• Ikäheimo Jouni
• Känsäkangas Tero
• Kolehmainen Jere

Classifications

• H02K2201/06

  Magnetic cores, or permanent magnets characterised by their skew · CPC title

• H02K1/246

  Variable reluctance rotors · CPC title

• H02K1/28 Primary

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K1/08

  Salient poles · CPC title

• H02K15/028

  Fastening stator or rotor bodies to casings, supports, shafts or hubs · CPC title