ELECTRICAL MACHINE AND MAINTENANCE METHODS THEREOF
FIG10 is a flow diagram of a method of performing maintenance operations in an electrical machine according to an example
FIG10 is a flow diagram of a method of performing maintenance operations 100 in an electrical machine according to an example. Box 103 represents removing one or more segments of the electrical conductor ring at least partially corresponding to the maintenance aperture. This may be according to any of the examples herein described, in particular according to examples described with respect to FIG10. Box 104 and 105 represents performing maintenance operations in the first region and in the second region of the inner structure as described with respect to the FIG10. Box 105 represents positioning the rotor in a second position as described with respect to FIG10.
flow diagram
103
Box
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generator bearing
100
performing maintenance operations
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Box
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Box
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Box
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generator
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Box
['7. An electrical machine (10) according to any of claims claim 1 - 6, wherein the electrical machine is an electrical generator, specifically a generator for a direct-drive wind turbine, and more specifically a permanent magnet generator.', '8. A method of performing maintenance operations (100) in an electrical machine (10), the electrical machine (10) having a plurality of electrical phases and comprising an inner structure (20), an outer structure (30) and an air gap (40) arranged between the inner (20) and the outer structure (30), the inner structure (20) being one of the rotor and of the stator and the outer structure (30) being the other of the rotor and of the stator; the method comprising: positioning (101) the rotor in a first position for accessing a first region (21) of the inner structure (20) through a maintenance aperture (30) in the outer structure (30); disconnecting (102) a portion of the plurality of electrical windings (53) of the stator from an electrical conductor ring (54) extending along the stator circumference for connecting the electrical windings to an electrical converter; removing (103) one or more segments of the electrical conductor ring (54) at least partially corresponding to the maintenance aperture (31) in the first position; positioning (105) the rotor in a second position for accessing a second region (22) of the inner structure (20) through the maintenance aperture (31), without connecting the removed segments of the electrical conductor ring to the remaining segment or segments of the electrical conductor ring (54).']