Synchronous electrical machine with U-shaped non-magnetic holder for permanent magnets
AssigneeRobert Bosch GmbH
InventorJuergen Lechner
Life of this patent
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Abstract
A synchronous machine, in particular a motor for a motor vehicle has an excitation system composed of a plurality of electrically excited individual poles in a stator or a rotor, preferably formed as claw poles excited by at least one joint excitation coil, wherein for compensation of a magnetic stray flux in the intermediate spaces between the mutually oriented and alternatingly nested claw poles, the permanent magnets are inserted on the pole plates on the ends of the stator or rotor, so as to facilitate and simplify the insertion of the permanent magnets required for compensation of the stray flux and to improve their compensation action.
Claims38
A synchronous machine formed as a generator for a motor vehicle, comprising a stator;
- a rotor, an excitation system including a plurality of electrically excited individual poles in said rotor and formed as claw poles excited by at least one common excitation coil;
- pole plates arranged on ends of said rotor;
- permanent magnets provided for compensation of a magnetic stray flux and inserted in free spaces between said claw poles which are directed oppositely to one another and are alternatingly nested in one another;
- a U-shaped non-magnetic holder in which said permanent magnets are inserted, said holder having a base leg which radially supports said permanent magnets against centrifugal forces, said holder having tongues bent on the holder, said holder having closed axial ends, said axial ends being closed by said tongues, said tongues of said holder being directly connected with elements selected from the group consisting of said poles plates and holding discs connected to said pole plates so as to axially fix said permanent magnets.
A synchronous machine formed as a generator for a motor vehicle, comprising a stator;
- a rotor;
- an excitation system having a plurality of electrically excited individual poles in said rotor, formed by claw poles which are excited by at least one common excitation coil;
- pole plates arranged on ends of said rotor;
- permanent magnets provided for compensation of a magnetic stray flux in free spaces between said claw poles;
- two U-shaped non-magnetic holders inserted in each of the free spaces, said holders are arranged one behind the other in an axial direction and having base legs supporting two of said permanent magnets against centrifugal forces, said holder having axial ends which face away from one another and are closed, said holder being provided with tongues at the ends which face away from one another, said tongues of said holders being directly connected with elements selected from the group consisting of said pole plates and holding discs connected to said pole plates so as to axially fix said permanent magnets, said holders having facing ends which are closed and connected with one another so as to axially fix two of said permanent magnets per each of the free spaces.
Dependencies are inferred from the claim text.