Patent ID: 7954376
Filing Date: 2011-06-07
Classification: H02K

Abstract:
1. Balancing device ( 1 ) for balancing a rotor ( 5 ) of an electrical machine, said machine comprising a mounted rotor ( 5 ) in a central bore ( 8 ) of a stator ( 6 ) and coaxially thereto, wherein between the rotor ( 5 ) and the stator ( 6 ) there is an air gap ( 7 ) having a substantially constant clearance ( 71 ) in a middle area ( 73 ) of the rotor ( 5 ) due to a cylindrical shape of the rotor ( 5 ) and bore ( 8 ), and a varying clearance ( 72 ) in terminal regions ( 74 ) due to varying diameters of the rotor ( 5 ) and bore ( 8 ), the balancing device ( 1 ) comprises at least a first section ( 11 ) and a second section ( 12 ) that are moveable in respect of each other and a third section ( 13 ) that is moveable in respect of the first section ( 11 ) and in respect of the second section ( 12 ), in order to pass through the air gap ( 7 ) in the terminal regions, at least one of the first section ( 11 ) or the second section ( 12 ) or the third section ( 13 ) comprise at least a guiding element ( 101 , 102 ) for circumferential guidance, a contact element ( 105 ) for establishing a contact between the surface of the rotor ( 5 ) and the device ( 1 ), and actuation element ( 106 ), for axial movement of the device ( 1 ), said rotor ( 5 ) comprising a plurality of axially extending ferromagnetic teeth and non-magnetic wedges arranged alternately around the circumference of the surface of the rotor ( 5 ), at least one of the teeth or the wedges comprise balancing openings for balancing weights, the balancing device ( 1 ), configured to be mounted to the rotor, comprises at least one of a mounting device ( 2 ) or a locking device ( 3 ) or a confirmation device ( 4 ), said device having a radial height that is smaller than a minimal clearance of the air gap ( 7 ) and an axial extension such that it can be inserted into the air gap ( 7 ) wherein the contact element is a roller bearing ( 105 ).