STATOR FOR AN ELECTRICAL MACHINE

• US 20130249330A1
• Filed: 03/22/2013
• Published: 09/26/2013
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Original Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Inventors: KING, Gary, TEDEN, Nicholas Richard Basil
• Granted Patent: US 9,263,919 B2
• Time in Patent Office: Days
• US Class Current: 310/43
• CPC Class Codes: H02K 1/141 consisting of C-shaped cores
• CPC Class Codes: H02K 1/18 Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures

Abstract

A stator includes a plurality of stator elements, each stator element comprising a c-shaped core having two poles. Each pole of each stator element is secured to a pole of an adjacent stator element by a bridge formed of a non-magnetic material moulded onto the poles.

Claims

1. A stator comprising a plurality of stator elements, each stator element comprising a c-shaped core having two poles, each pole of each stator element being secured to a pole of an adjacent stator element by a bridge formed of a non-magnetic material moulded onto the poles.

2. The stator as claimed in claim 1, wherein each pole comprises an anchor in the form of a recess or protrusion formed on a surface of the pole, and the bridge is moulded to the anchors of the poles.

3. The stator as claimed in claim 1 or 2, wherein each pole comprises an arcuate pole face and at least part of the pole face is unobscured by the bridge.

4. The stator as claimed in claim 1, wherein the core of each stator element comprises a back and two arms that extend from opposite ends of the back, each stator element comprises a bobbin located on each arm, and a coil wound about each bobbin.

5. The stator as claimed in claim 1, wherein the bridge comprises a recess for receiving a sensor.

7. An electrical machine comprising a rotor and a stator as claimed in claim 1 or 6, wherein the stator elements are arranged around the rotor.

8. The electrical machine as claimed in claim 7, wherein an air gap between the rotor and the stator is asymmetric.

6. A stator comprising two stator elements and two bridges, each stator element comprising a c-shaped core having a back and two arms that extend from opposite ends of the back, the free end of each arm defining a pole, and each bridge is formed of a non-magnetic material moulded onto a pole of each stator element.