Electric motor excited by permanent magnets
AssigneeRobert Bosch GmbH
InventorVolker Bosch
Life of this patent
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Abstract
The rotor (7) of an electric motor is provided, on its surface and/or in its interior, with recesses (12, 13, 14, 15, 16, 17, 18, 19), which are placed and dimensioned such that they do not interrupt lines of the magnetic flux that are oriented radially to the surface of the rotor (7) and form a short circuit via the rotor (7). These recesses reduce the thermal capacity of the rotor (7) to such an extent that a layer of a magnetic material that forms a plurality of permanent magnets (8, 9, 10, 11) can be sprayed onto the surface of the rotor (7).
Claims8
An electric motor with permanent-magnet excitation, which has a rotor (7) on whose surface oriented toward the inside of a stator (1) a plurality of permanent magnets (8, 9, 10, 11) are disposed, characterized in that the rotor (7) is provided, on its surface and/or in its interior, with recesses (12, 13, 14, 15, 16, 17, 18, 19), which are placed and dimensioned such that they do not interrupt line of the magnetic flux oriented radially to the surface of the rotor (7) and forming a short circuit via the rotor (7).
The electric motor of one of the foregoing claims, characterized in that the rotor (7) comprises layered iron sheets.
Dependencies are inferred from the claim text.