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Precise control methods of the electric drives with induction machines like field oriented control (FOC) or direct torque control (DTC) need an accurate model of the machine they control. Certain parameters of the model have to be obtained with sufficient accuracy before the drive can be put into the operation. This article concerns an offline parameter identification method that is suitable for on-site...
This paper investigates the use of fractional order PIα controllers, applied to inverter driven induction machines. Fractional order controllers provide additional degrees of freedom for their design, and the non-linearity introduced by the fractional part of the controller provides better tuning for the operation of the controller. In this work a fractional PI controller is applied to the current...
The paper presents an experimental comparison of the efficiency and losses characteristics of 3 hp Premium efficiency and EFF1 induction motors. North American and European motors were tested according to Standard IEEE 112-B. A comparison, at rated operating point, shows that, under the same load conditions, the Premium motor operates with 2 % higher efficiency than EFF1 motor. However, in low voltage...
A direct online stator winding resistance measurement scheme is proposed as a means to improve standard efficiency tests of polyphase induction machines. To enable resistance measurement a DC current is injected online into the stator winding and response voltages are captured. In experimental tests an unequal number of anti-parallel diodes has been used to inject DC current. A bespoke temperature...
This article investigates the effect of the test solution conductivity on the insulation resistance (IR) measurement, provides the NEMA-approved clarification of the sealed winding test specification, and suggests further clarifications to the sealed winding test procedure.
A lot of test methods to determine losses of induction motor have been proposed and standardized. Different countries around the world have been collected from those test method. In this paper, the differences among IEC 61972, 34-2 and IEEE 112-methodB are shown and testing results are also compared. The main discrepancies between the various standards are the way of quantification of the stray load...
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