Problem 2 A 3-phase 2-pole induction motor is rated 190 V, 60 Hz, it is connected in Y, and has R2 = 6.6 Q, R1= 3.1 N, Xm = 190 Q, X2 = 10 Q, and X1 = starting current and starting power factor under rated voltage. What will be the current and power factor if no load is connected to the shaft? 3 N. Calculate the motor starting torque,
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- Please Do not Designed 15 Kw Please Must Show Given Questions in Design for 11KW Motor . A15 kW, 440 V, 4-pole, 50 Hz, 3-phase induction motor is built with a stator bore 0.25 m and a core length of 0.16. The specific electric loading is 23000 ampere conductors/meter. Using the data of this machine, determine the core dimensions, number of stator slots and number of stator conductors for 11 kW, 460 V, 6 pole, 50 Hz motor. Assume a full-load efficiency of 84% and power factor of 0.82 for each machine.the Winding Factor is 0.955.A 220 V, single-phase induction motor gave the following test results:Blocked-rotor test: 120 V, 9.6 A, 460 WNo-load test: 220 V, 4.6 A, 125 WThe stator winding resistance is 1.5 Ω, and during the blocked-rotor test, the starting winding is open. Determine the equivalent circuit parameters. Also, find the core, friction and windage losses.A three-phase Y-connected 230-V (line-to-line) 7.5-kW 60-Hz six-pole induction motor has the following parameter values in Ω/phase referred to the stator: R1 = 0.294, R2 = 0.144 X1 = 0.503, X2 = 0.209, Xm = 13.25 The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 4 percent, determine: (a) stator current, power factor, (b) output torque and power,(c) efficiency when the motor is operated at rated voltage and frequency, (d) the load component 12 of the stator current, the induced torque Tind, and the converted power Pconv for a slip s= 0.04,(e) the maximum torque and the corresponding speed; and (f) the starting torque Tst and the corresponding stator load current 12 start
- 1.5 A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters Winding Resistance................0.19 Ω ......... Winding Reactance.................1.12 Ω.......... Rotor Parameters Winding Resistance......................0.29 Ω Winding Reactance.....................1.12 Ω Magnetising Reactance................................16.8 Ω Equivalent Core‐loss Resistance....................900 Ω. The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine: 1.5.1 The stator current. 1.5.2 Estimate the Output torque of the motor under the rated conditions. 1.5.3 The Motor…3-phase, star-connected, 220 V line to line, 50-Hz, 4-pole induction motor has the following constants in ohm per phase referred to stator. r1 = 0.29, r2 = 0.14, X1 = 0.5, X2 = 0.21 and magnetizing reactance X0 = 13.25 ohms .The total friction windage and core lose may be assumed to be a constant at 400 watts. For a slip of 2 percent calculate: a.)Speed b.)Output, and c.) Stator current of the motor1.Show that if three phase currents, each of equal magnitude and differing in phase by 120degree, flow in a three phase winding that are 120 degree apart from each other then it willproduce a rotating magnetic field of a fixed magnitude. 2. A three phase, 5-hp, 60Hz, 115V, 4-pole induction motor is operating at rated voltage, rated frequency, and 125 percent rated load has an efficiency of 85.4 percent. The stator conductor loss, rotor copper loss and core loss are 223.2W, 153W, and 114.8W respectively.Sketch the power flow diagram, enter the given data, and determine i) shaft speed ii) shaft torque 3. Can single phase induction motor be self-started? Explain the operation of a split phase single phase induction motor?
- An approximate per phase equivalent circuit of a 3-phase, 220-V, wye-connected, 6 pole, 60 Hz induction motor is shown in figure below for which R1 = 0.3 ohm; X1 = 0.4 ohm; R’2 = 0.4 ohm; X’2 = 0.6 ohm; Xm = 15 ohms. For the given numerical values calculate the total developed(electromagnetic) torque in (kg-cm) .The motor speed is 1080 rpm.A 200V, 3, star connected induction motor takes 30A at a line voltage of 35V with rotor locked. With this line voltage, power input to motor is 450W and core loss is 60W.The dc resistance between a pair of stator terminals is 0.15Ω. If the ratio of ac to dc resistance is 1.6, find the equivalent leakage reactance/phase of the motor and the stator and rotor resistance per phase.A single-phase, 120 V, 60 Hz, 1/2 hp, 1740 rpm split-phase fan motor gave the following testresults:V I PNo load test 120 4 110Standstill test (main winding) 41 5.8 115Standstill test (auxiliary winding) 38 7 200Main winding resistance = 1.85 Ω.a) Obtain an equivalent circuit for the motor for running conditions.b) Determine the no-load rotational loss.c) Determine the efficiency at the rated speed.
- Find the main dimensions, number of stator turns and number of stator slots of a 30 H.P., 440 volt, 3 phase, 50 Hz, 960 rpm squirrel cage induction motor using following data: Specific magnetic loading = 0.45 wb/m² Specific electrical loading = 25000 amp. conductor/cm, full load efficiency= 0.86, full load power factor = 0.87. Assume that stator winding is delta connected for normal running.13. The main and auxiliary windings of a hypothetical 110-V, 60-Hz, split-phase motor have the following locked-rotor parameters: Rmw = 2.2 Ohms, Xmw = 3.2 Ohms, Raw = 9.63 Ohms, and Xaw = 8.9 Ohms. The motor is connected to a 110-V, 60-Hz system. Determine the external resistance in Ohms required in series with the auxiliary winding in order to obtain a 26 degrees phase displacement between the currents in the two windings. Correct Answer: 6.11Three-phase induction motor, 460 V 50 Hz, 4 poles, 50 hp with Delta, operating at 3.8% slip rated torque when receives Line Voltage 460 V, 50 Hz The parameters of the equivalent circuit per phase are as follows.R1 = 0.33, X1 = X2 = 0.42 and Xm = 30 Ohm / phase.Answer the following questions by neglecting the mechanical losses, Core losses and Stray load losses.A) Value of the rotor resistance R2 B) Maximum torque and rated speed C) line current and starting torque of motor