Space-phasor model of a three-phase induction motor with a view to digital simulation

Alexandrovitz, A.; Zuckerberger, A.

doi:10.1016/0378-7796(87)90014-9

Cited by 6 publications

(10 citation statements)

References 1 publication

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“…By comparing between theoretical and experimental results, similar findings are observed where the magnitude of t 11 and t 21 are larger in theoretical transduction matrix. t 12 and t 22 are similar to theoretical results. However, the determinant for experimental results is different from theoretical determinant.…”

Section: Resultssupporting

confidence: 87%

“…Theoretical Transduction Matrix with Peak Value of Voltage and Current: From the transduction matrix, generally t 11 has the largest magnitude among the four functions, followed by t 12 and t 21 . Meanwhile t 22 has relatively small value which is closed to zero. All the transduction functions are complex number as the system is assumed to have constant frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The transduction functions of an induction motor which is running at constant frequency can be expressed as follows [70], [71]: (3.55 and 3.56) In experiment, value of t 11 and t 21 can be calculated by maintaining ω 2 = 0, which is the clamp condition. Similarly t 12 and t 22 can be described by maintaining T 2 = 0, also know as free condition. However, clamp condition is difficult to be achieved in real experimental setup because relatively small vibration can still be observed at output terminal especially for large scale system [71].…”

Section: Direct Methodsmentioning

confidence: 99%

“…According to the transduction matrix developed, t 11 and t 12 are much larger than t 21 and t 22 . This is because stator resistance is involved in both t 11 and t 12 and stator resistance is much larger than rotor resistance.…”

Section: Figure 3-7: Equivalent Circuit Of Each Component In Inductiomentioning

confidence: 98%

“…Z mr appears in both t 11 and t 21 , but the magnitude of Z mr will be closed to unity. All the transduction functions consist of motor parameters such as air-gap distance, number of pole pairs and winding factor except t 22 , which is equal to zero. Parameter t 22 is equal to zero because according to Eq.…”

mentioning

confidence: 99%

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Transduction matrix of AC motor driven mechanical systems : system modelling and fault diagnosis

Lian¹

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In this dissertation, a modelling technique for motor driven system based on transduction matrix is introduced. Transduction matrix describes the relationship between input and output of a system in frequency domain, thus it provides better understanding of the system's condition. For a motor driven system running at constant frequency, the transduction matrices for induction motor, power transmission system and mechanical loading can be obtained from respective governing equations. Since transduction matrix represents the system's properties, condition monitoring can be attained by studying these transduction functions. In addition, transduction matrix facilitates the analysis on both impedance propagation and power flow in the motor driven system.Consequently, the electrical input impedance that consists of transduction function is utilized in condition monitoring of induction motor. Studying the frequency components of electrical input impedance allows characteristic frequencies of motor faults to be identified. Therefore, the proposed monitoring signature is used to monitor the change of signature due to broken rotor bar, abnormal air-gap eccentricity and bearing faults. By comparing with the results from conventional monitoring technique, impedance signature proved to have better sensitivity as fault signature is amplified. Furthermore, wavelet packet transform is utilized in order to carry out fault detection in time-frequency analysis, where the signal to noise ratio is improved and make the fault detection easier.

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