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A new type of on-line automatic balancing system — the electromagnetic balancing system is concerned in this composition. The balancing head in this system consists of two stators and two slide plates. Each slide plate, on which there is a correction mass, can be driven to move relative to the shaft in single direction by the electromagnetic force. The positions of both masses are able to be detected conveniently by corresponding sensors. The balancing method is a conventional one. The moving procedure of the correction mass to meet the slide’s single -direction rotating character is described. Experiment results of its application to flexible rotor are also included.