As the existing static bandwidth allocation algorithms cannot effectively utilize the limited bandwidth in networked motion control systems based on CAN,two dynamic bandwidth allocation algorithms based on feedback control are proposed.In these algorithms,bandwidth is reasonably allocated in accordance with the actual network state and control requirements through adjusting the sampling period.Moreover,as the wide fluctuation of sampling period may result in system instability and excessive resource consumption,three typical sampling periods are preset to realize the bandwidth allocation by switching.Simulated results show that the proposed dynamic bandwidth allocation algorithm is superior to the fixed one.