PC based data acquisition system for measurement of switched reluctance motor (SRM)

Flux linkage measurement method for switched reluctance motors and inductor/transformers using a real-time DSP system

“…However, maintaining a constant current and speed during the test is a Flux linkage measurement of SR motors 627 rather difficult task because of the induced variable back EMF and the variable magnetic torque, respectively. Some other schemes of numerical integration methods, basically similar to the one proposed by Krishnan and Materu (1989) were described by Pollock (1994a, 1994b), Ramanarayanan et al (1995), Walivadekar et al (1996) and Sharma et al (1999). In these various methods, either a digital oscilloscope (Lee and Pollock 1994a, 1994b, Ramanarayanan et al 1995, Sharma et al 1999 or a DAS (Ferrero andRaciti 1990, Walivadekar et al 1996) is used to acquire data and a PC is used for offline data processing.…”

“…Hence, one of the most important problems in the field of SRMs is a practical and accurate instrumentation system for the SRM magnetic characteristics. As a result, several methods of flux linkage measurement have been proposed for experimentally measuring the flux linkage (Prescot and El-Khavashi 1959, Krishnan and Materu 1989, Ferrero and Raciti 1990, Ray and Erfan 1994, Lee and Pollock 1994a, 1994b, Ramanarayanan et al 1995, Walivadekar et al 1996, Sharma et al 1999). However, as will be discussed below, a disadvantage of the various previous methods is that they suffer from either relatively low accuracy or high complexity.…”

“…D. Cheok and Z. Wang To evaluate the accuracy of the measurement result, as suggested by Walivadekar et al (1996), the incremental inductance of the winding in the unsaturated region for different rotor angles was calculated using the measured flux linkage characteristics and was then compared with experimentally measured inductance from a magnetic analyser. The magnetic analyser can be used only at low current levels and thus only the inductance obtained in the low current region can be compared.…”

Computer-based automated test measurement system for determining magnetization characteristics of switched reluctance motors

“…Some recently introduced digital methods have used a personal computer [10] or digital oscilloscope [11] to acquire the voltage and current waveforms, and then to integrate and plot the flux linkage. However, a disadvantage with these methods is that the measurement is still not fully automated in terms of controlling the motor voltage switching during the test, or providing calibration of the sensors.…”