Localised losses in stator laminations of an induction motor under PWM excitation

Predicting the localized flux distribution in three phase induction motor between different stator slot size

“…The peak value of resultant flux density is decreased towards the outer region of the stator core. This is due to core geometry, which influences the flux and loss distribution [3]. Along the rest of the tooth, the radial component of the flux density is dominant and the flux density in the stator tooth is nearly purely alternating in most of the tooth.…”

“…The 0.1mm wire search coils is used to measuring the tangential and radial components. The coils were threaded through 0.3mm diameter holes sufficiently small to avoid disturbing the flux distribution to any practical extent [3]. The drilled process as shown in center, stator tooth root and stator yoke, as shown in Figure 4 and Figure 5.…”

Opportunities and Precautions in Measurement of Power Loss in Electrical Steel Laminations Using the Initial Rate of Rise of Temperature Method

“…Moses and Tutkun [15] investigated the localised power loss of a stator lamination made from non-oriented silicon free electrical steel at locations behind slots and teeth, under PWM and sinusoidal excitations by using thermistors in a four-arm DC voltage bridge. The localised power losses obtained by measuring the rate of rise of temperature over a 20 Sec energisation time was claimed to have a maximum error of ± 8%.…”

“…Provided that the ambient temperature remains constant for the duration of the test, the initial rate of rise of temperature is proportional to the heat input, and hence the localised power loss, at the measurement points [9]. This principle has been widely applied by previous researchers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] to measure localised power loss in magnetic cores.…”

Core loss determination in electric machines using short‐time transient thermal measurements

“…The methods commonly used to measure temperature rise for inverse modelling applications can be categorised into three groups: (i) calorimetric measurements [20,[23][24][25], (ii) infrared thermographic measurements [18,19,26,27], and (iii) thermal sensor measurements with thermistors/thermocouples [28,29]. Each method has its advantages and disadvantages.…”