Active Control of Magnetically Levitated Bearings

Barney, P.; Lauffer, J.P.; Redmond, James M.; Sullivan, W. N.

doi:10.2172/780303

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…This method is widely used in research of self-sensing piezoelectric actuators and many researchers used SSA in different applications. Barney et al [21] used PZT stack SSA based on a capacitance bridge circuit to control the vibration of a boring bar. Boettcher et al [22] used a capacitance bridge circuit to extract the displacement signal from the micro piezoelectric actuator of a hard disk drive (HDD), and the H ∞ control method was used to reduce vibration.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

Chen

et al. 2018

Smart Mater. Struct.

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The motorized spindle is the core component of CNC machine tools, and the vibration of it reduces the machining precision and service life of the machine tools. Owing to the fast response, large output force, and displacement of the piezoelectric stack, it is often used as the actuator in the active vibration control of the spindle. A piezoelectric self-sensing actuator (SSA) can reduce the cost of the active vibration control system and simplify the structure by eliminating the use of a sensor, because a SSA can have both actuating and sensing functions at the same time. The signal separation method of a SSA based on a bridge circuit is widely applied because of its simple principle and easy implementation. However, it is difficult to maintain dynamic balance of the circuit. Prior research has used adaptive algorithm to balance of the bridge circuit on the flexible beam dynamically, but those algorithms need no correlation between sensing and control voltage, which limit the applications of SSA in the vibration control of the rotor-bearing system. Here, the electromechanical coupling model of the piezoelectric stack is established, followed by establishment of the dynamic model of the spindle system. Next, a new adaptive signal separation method based on the bridge circuit is proposed, which can separate relative small sensing voltage from related mixed voltage adaptively. The experimental results show that when the self-sensing signal obtained from the proposed method is used as a displacement signal, the vibration of the motorized spindle can be suppressed effectively through a linear quadratic Gaussian (LQG) algorithm.

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Section: Introductionmentioning

confidence: 99%

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

Chen

et al. 2018

Smart Mater. Struct.

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“…AMBs are electromagnets arranged in a ring configuration levitating the rotor at the center of the stator. This magnetic levitation allows the bearing to be contact-less, which eliminates the issue of mechanical wear, friction, and thus eliminates the need for lubricants [2]. AMBs are, however, open-loop unstable requiring the need for robust feedback controls [1].…”

Section: Introductionmentioning

confidence: 99%

Control of Magnetic Bearings for Rotor Unbalance With Plug-In Time-Varying Resonators

Kang

Tsao

2015

Journal of Dynamic Systems, Measurement, and Control

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Rotor unbalance, common phenomenon of rotational systems, manifests itself as a periodic disturbance synchronized with the rotor's angular velocity. In active magnetic bearing (AMB) systems, feedback control is required to stabilize the open-loop unstable electromagnetic levitation. Further, feedback action can be added to suppress the repeatable runout but maintain closed-loop stability. In this paper, a plug-in time-varying resonator is designed by inverting cascaded notch filters. This formulation allows flexibility in designing the internal model for appropriate disturbance rejection. The plug-in structure ensures that stability can be maintained for varying rotor speeds. Experimental results of an AMB-rotor system are presented.

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Active Control of Magnetically Levitated Bearings

Cited by 2 publications

References 6 publications

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

Control of Magnetic Bearings for Rotor Unbalance With Plug-In Time-Varying Resonators

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