MAGLEV ULTRA-HIGH-SPEED GRINDING WHEEL SPINDLE

Magnetic bearings contribute to the reliability of machining systems. In this article, the author describes a way to achieve a 5000 m/min speed for a wheel spindle. The maglev spindle uses electromagnetic current control with 5 degrees of freedom. It has no airflow restrictions. It has a little eddy current, so the rise in the steel plate's temperature is not a problem. It assures good rotational precision because the spindle does not get close to a dangerous speed. The author gives an example of a 180,000-rpm spindle. Its merits are unlimited life, proximity displacement sensor signal monitoring, automatic balancing, and active control of revolving rotational axes displacement.