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US 2009/0151450 A1Published application
Method and device for balancing a rotor of an electrical machine
AssigneeALSTOM Technology Ltd
InventorsAnders Angantyr, Gabor Csaba
Life of this patent
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AssigneeALSTOM Technology Ltd
InventorsAnders Angantyr, Gabor Csaba
Estimating the term…
A balancing device is provided that is able to balance a rotor of an electrical machine. The machine includes a mounted rotor in a central bore of a stator and coaxially thereto. Between the rotor and the stator there is an air gap. The rotor preferably comprises a plurality of axially extending ferromagnetic teeth and non-magnetic wedges being arranged alternately around the circumference of the surface of the rotor. The teeth and/or the wedges preferably include balancing openings for balancing weights. The balancing device includes a mounting device and/or a locking device and/or a confirmation device. The device has a radial height that is smaller than the minimal clearance of the air gap and an axial extension such that it can be inserted into the air gap. With such a device it is possible to balance a rotor in an efficient way, when it is located in the bore of the stator.
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), 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) 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).
A method of balancing a rotor (5) of an electrical machine, the rotor (5) being located in a bore of a stator (6) with an air gap (7) defined between the rotor (5) and the bore, the method comprising mounting at least one of a balancing weight or a test weight to the rotor (5) through said air gap (7).
Dependencies are inferred from the claim text.