3-Phase Induction Motors EE 340 . Where does the power go? • The electric energy generated purchased by consumers for different needs. This energy is -Conversion to mechanical power by motors (pumps, fans, HVAC, refrigeration - compressors, power tools, food processors, escalators, elevators, ….) These equations can be solved for R2, X 1 , and X 2 as follows: R 2 = (P PH /I 1 2 ) − R 1 and (by assumption) X 1 = X 2 = ½ │Z 11 2 − (R 1 + R 2 2 Assuming that the stator resistance R 1 is measured at DC and that phase power P PH , phase voltage V 1 , and phase current I 1 are measured, R 2 , X 1 , and X 2 Semi closed slots are preferred for induction motors because with their use the gap contraction factor is small giving a small value of magnetizing current. The use of semi enclosed slots results in low tooth pulsation loss and a much quieter operation as compared with that with openslots. 4. Stator slots Number of stator slotsS S=3pq S APRIL 19TH, 2018 - INDUCTION MOTOR WINDING TURNS CALCULATION PDF FREE DOWNLOAD HERE WINDING TYPE INFLUENCE ON EFFICIENCY OF AN INDUCTION MOTOR HTTP PE ORG PL ARTICLES 2011 3 16 PDF'' Programming Turns Per Phase Q S Calculations Of An Induction Motor Design It Is Observed That' 'induction motor wikipedia 15 / 26. april 10th, 2018 - an The design of the induction motors is been well established, there are some areas which require special care. The manual design is been a lengthy calculation and if any change in the parameters needs to be recalculated. This results in the time and effort is required by the designer to do the calculations accurately [8]. it will be the subject of study in this work): (1) it is less expensive and more reliable as it does not need any centrifu- gal switch, (2) it has a low starting to rated torque ratio, (3) it needs Motor Slip. Slip of a motor can be found from the formula: s = (η sync -η m )/ η sync * 100. η sync = Speed of magnetic field. η m = Mechanical shaft speed. Calculation: The rotor speed of a 4 pole induction motor at 50 Hz is 1200 r/min. Calculate its slip. Solution: Rotor speed = η m = 1200 r/min. Where η sync = 120 * 50 / 4 = 1500 r/min. AC INDUCTION MOTOR CONSTRUCTION AND PERFORMANCE Easy to predict motor performance for a three-phase motor windings, notoriously difficult for a single-phase designs Limited availability for copper fabricated rotors Still a popular choice for a new 400 Hz military and commercial aerospace applications DESIGN EXAMPLE OF 45KW CAGE INDUCTION MOTOR A. Table I: Reference Data This data consists of required customer specifications, based on this data calculation of the parameters of motor is done. Frequency Hz Voltage V Current A Power kW Poles 50.0 415.0 76.00 45.00 2 B. Table II: Parameters Parameters Calculated values •Supply the rated voltage to induction motor, keep it running. •The current drawn by motor is quit low •Take care of the voltmeter should be of voltage ratings of induction motor & the ratings of ammeter should be low because the current drawn by motor is very small. •Take the readings of voltmeter, ammeter and wattmeter. Created Date The ratings of induction motors vary from a few tens of watts to 33120 kW (45000 HP). The distribution of ratings in variable speed drives is shown in Table 1.1. [1] Table 1.1. Variable speed a.c. drives ratings Power (kW) 1 - 4 5 - 40 40 - 200 200 - 600 >600 Percentage 21% 26% 26% 16% 11% The ratings of induction