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The diagnosis of rotor broken bars in induction machines (IMs) is commonly carried out by means of Motor Current Signature Analysis, i.e., by classical spectrum analysis of the input currents. Specifically in case of broken bars, the amplitude of the left and right sideband components of a phase current is monitored in order to sense their signature. However Motor Current Signature Analysis, based...
The main features of an electric drive for electric vehicles (EVs) should be the capability to exploit the maximum torque in the whole speed range, a weak dependence on the motor parameters, a good robustness against the variations of the dc-link voltage and, whenever possible, the maximum efficiency. In this paper a control scheme for induction motors, with all these features, is presented. The performance...
A control scheme for induction motor that integrates within a coherent solution some of the features that are commonly required to an electric vehicle drive is presented. The main features of the proposed control scheme are the capability to exploit the maximum torque in the whole speed range, a weak dependence on the motor parameters, a good robustness against the variations of the dc-link voltage...
In this paper some different control strategies, suitable for open-phase fault operation of seven-phase current regulated induction motor drives, are presented. These strategies, which are valid in steady-state as well as in transient operating conditions, are compared in terms of stator and rotor copper losses and torque pulsations. The comparison is carried out by means of an opportune mathematical...
The control scheme of a speed-sensorless induction motor drive fed by a matrix converter is presented. The proposed scheme allows the motor to exploit the maximum torque capability at any speed, shows a moderate dependence on the motor parameters, and a fast torque response, even in the field- weakening speed range. The behaviour of the matrix converter is assessed by means of experimental results.
A method for the flux weakening operation of DTC induction motor drives is proposed. The flux reference is adjusted on the basis of the torque error, thus determining a spontaneous flux weakening. For implementing this algorithm, it is necessary to estimate the maximum torque that the induction machine is able to generate at any speed. The main features of the proposed system are little dependency...
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