Active Vibration Control of AC Induction Machines Using Periodic Feedback and Least Mean Squares Methods

Active vibration control in AC machines is used for minimizing the radial rotor vibrations. These vibrations are caused by structural characteristics of the machine and they occur in all kinds of electrical machines. Several active control methods have been applied in the machines and the results have been promising. This paper introduces two new methods that utilize the theory of linear time periodic systems. The first method gives a periodic feedback control as a solution to a discrete-time periodic Riccati equation (DPRE). The second method yields a feedforward type controller that is capable of compensating several simultaneous disturbance signals of different frequencies summed to the output of the system. It is possible to use these two control methods such that they form a serial control topology algorithm.