Device for measuring rotor imbalance
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United States of America Patent
Stats
-
Mar 23, 2004
Grant Date -
Jun 5, 2003
app pub date -
Oct 2, 2002
filing date -
Jan 5, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a device for measuring a rotor imbalance. Said device comprises a main shaft which is rotatably mounted in a machine housing and to which the rotor to be measured is fixed, a single-phase alternating-current motor for driving the main shaft, with a single-phase winding (4) and an auxiliary winding (5) which is offset in phase for driving the main shaft (1) up to measurement speed and a control device (17) that adjusts the current of the motor. Said control device (17) has an assembly (8, 6; 7; 20; 22, 23) which reduces the supply current delivered to the two windings (4, 5) of the motor (3; 21) once the measurement speed has been reached, in such a way that the motor creates a reduced torque which substantially compensates a speed drop produced by friction and drag.
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