Stamp, ARD; (2012) Extending the performance and bandwidth of electromechanical devices. Doctoral thesis , UCL (University College London).

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Abstract

Electromechanical devices are used in a wide range of dynamic applications, from hard disk drives to levitating trains; therefore any improvements in the dynamic performance of such devices would be of significant academic and commercial benefit. This thesis presents theoretical and experimental analyses of shorted turns (conductive loops inductively coupled to a coil). The effect of shorted turn design parameters was investigated using electromagnetic actuator models, measuring force and electrical impedance, with the aims of increasing dynamic range and stability. It was found that a shorted turn reduces the motor constant at high frequencies; it does however significantly improve the transient response of the total coil current. This would suggest that although a shorted turn is likely to reduce the peak force, with the correct shorted turn configuration an increase in acceleration may be apparent; this would be particularly beneficial for positioning actuators with fast response time, such as those found within hard disk drives. A shorted turn was also found to provide damping, attributed to eddy-currents, which reduced resonance in tests. Utilising an inductively-coupled secondary coil it was possible to control the shorted turn effect, switching it on and off as desired. This could be applied in practice: the shorted turn could be passive in the acceleration phase and active in the deceleration phase, potentially leading to improvements in the dynamic performance.

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