Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-02-24
1996-04-02
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, H02K 708
Patent
active
055043810
ABSTRACT:
A vibration control device for a rotating machine in which a primary yoke is provided within a hollow space of a secondary yoke so that the secondary yoke rotates about a shaft inserted through the primary yoke. A plurality of electromagnet portions are arranged around a peripheral surface of the primary yoke and there are a pair of sensors and a control portion. The electromagnet portions include at least a pair of first and second electromagnet portions and another pair of third and fourth electromagnet portions. The first and second electromagnet portions so arranged opposite to each other with respect to an X-axis direction, while the third and fourth electromagnet portions are arranged opposite to each other with respect to a Y-axis direction. One sensor detects a positional displacement between the primary and secondary yokes with respect to the X-axis direction, while another sensor detects a positional displacement between the primary and secondary yokes with respect to the Y-axis direction. A positional displacement detected by one sensor is controlled to be reduced by controlling electric current supplied to the first and second electromagnet portions, while a positional displacement detected by another sensor is controlled to be reduced by controlling electric current supplied to the third and fourth electromagnet portions. By electromagnetically controlling the positional displacement between the primary and secondary yokes with respect to each of the axial directions, vibration of the shaft is reduced.
REFERENCES:
patent: 5235227 (1993-08-01), Fazekas
patent: 5455472 (1995-10-01), Weiss et al.
European Search Report, European Patent Office Dated Jun. 23, 1994.
Siegwart, R. and Traxler, A., Proceedings of the 25th Intersociety Energy Convension Engineering Conference 3:494-9, 1990.
Dougherty Thomas M.
Jones Judson H.
Shinko Electric Co. Ltd.
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