Multiple magnetic paths machine

• US 4,980,595 A
• Filed: 04/27/1989
• Issued: 12/25/1990
• Est. Priority Date: 11/23/1987
• Status: Expired due to Fees

• Current Assignee: Chrysler Corporation (Stellantis NV)
• Original Assignee: Chrysler Corporation (Stellantis NV)
• Inventors: Arora, Ram S.
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US07/346,336
• Time in Patent Office: 607 Days
• Field of Search: 310/263, 310/190, 310/90, 310/62, 310/63, 310/254, 310/257, 310/184, 310/261, 310/68 D, 310/51, 310/114, 310/156, 310/198, 310/208
• US Class Current: 310/263
• CPC Class Codes: H02K 16/02 Machines with one stator and two or more rotors
• CPC Class Codes: H02K 19/26 characterised by the arrangement of exciting windings
• CPC Class Codes: H02K 21/044 Rotor of the claw pole type

Abstract

Separate multiple flux paths for an electrical generator or motor are provided in a single rotor machine by axially mounting a plurality of pole structures on the rotor shaft. Each pole structure includes a pair of interleaved claw-type pole pieces forming each separate path, with an excitation source sandwiched between the pole pieces. The excitation source in at least one of the pole structures comprises a non-magnetic sleeve mounted on a shaft of the rotor between the pole pieces and an annular permanent magnet mounted on the sleeve. The excitation source in at least one other of the pole structures comprises a permeable core mounted on the rotor shaft between the pole pieces and a conductive coil encircling the core.

Claims

1. An electrical machine having multiple magnetic flux paths comprising:

a rotor shaft;

a plurality of pole structures mounted axially on said rotor shaft, each producing a magnetic flux on a separate flux path, each of said pole structures comprising a pair of pole pieces and an excitation means sandwiched therebetween for generating opposing magnetic polarities in each of said pole pieces forming said separate magnetic flux path;

each of said pair of pole pieces having respective first and second pluralities of axially extending projections, the first plurality of axially extending projections extending toward and being interleaved with the second plurality of axially extending projections;

wherein said excitation means in at least one of said pole structures comprises a non-magnetic sleeve mounted on said rotor shaft between the pole pieces of the at least one of said plurality of pole structures and an annular permanent magnet mounted on said sleeve; and

wherein said excitation means of at least another one of said plurality of pole structures comprises a permeable core mounted on said rotor shaft between the pole pieces of the at least another one of said plurality of pole structures, and a conductive coil encircling said core for conducting electrical current therethrough.