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US 2011/0210637 A1Published application
Rotor for an electric machine with reduced detent torque
AssigneeRobert Bosch GmbH
InventorKurt Reutlinger
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AssigneeRobert Bosch GmbH
InventorKurt Reutlinger
Estimating the term…
The invention relates to an electric machine, in particular to a generator for supplying the electrical system of a motor vehicle, comprising a laminated rotor (20) with an energiser winding (29), which provides the energisation for the machine preferably in conjunction with permanent magnets (24, 25) arranged on the rotor periphery. According to the invention, the rotor laminate bundle (21) is made up of at least two part bundles (21a, b) in the axial direction with grooves (40) running into each other and with poles offset relative to each other (32 to 38). A machine with reduced detent torque is thus obtained with grooves (40) aligned parallel to the axis, in which the energiser windings (29) can be placed with a high filling factor and without production difficulties and without the risk of damaging the winding insulation.
An electric machine, having a laminated stator (16) with a multi-phase stator winding (18) and having a laminated rotor (20) with an exciter winding (29) which is arranged in grooves (40) and supplies the excitation of the machine together with permanent magnets (24, 25) arranged on a rotor circumference, characterized in that a laminated rotor packet (21) is divided in an axial direction into at least two component packets (21a, b) with grooves (40) running in alignment with one another and poles (32-38) which are offset with respect to one another.
Dependencies are inferred from the claim text.