The following test results were recorded for a locked-rotor test performed on a 100 hp, 575...
Example 20-4. A 200 hp (150 kW), 460 V, 3-phase, 3520 r/min, 60 Hz induction motor has a locked-rotor torque of 600 Nom and a locked-rotor current of 1400 A (same motor as in Example 20- 2). Two autotransformers, connected in open delta, and having a 65 percent tap, are employed to provide reduced-voltage starting. Calculate a. The apparent power absorbed by the motor b. The apparent power supplied by the 460 V line c. The current supplied by the...
2) A 460 V, 4-pole, 60 Hz, Y-connected, 40 hp, design class A induction motor is tested with the following results: No-load: 460 V, 8.7 A, 2500 W. 60 Hz Locked rotor: 42 V.48 A, 31 10 W. 12 Hz DC test: 24 V, 48 A Find the equivalent circuit of this motor (Ri, Ro. Xi. X. XM) and its rotational losses. (20 points) X, and A2 as functions of XL Retor Design Wound rotor Design A Design B Design...
:00 Hz, six-pole Y-connected 40-hp design class B induction motorX -0.4Xux, and 3. A 460-V. 60Hz, six-pole Y-connected 40-hp X2-0.6XLR) is tested in the laboratory, with the following results: No load Test: 460 V, 32.7 A, 4,664 W, 60 Hz Locked Rotor(LR) Test: 36.2 V, 58.0 A, 2,573 W, 15 Hz: DC test: 12.0 V, 59.0 A: Find the equivalent circuit parameters Ri(10pts),R (10pts),X (15pts),X:(15pts), and Xx(10pts) of this motor as shown in Fig. 3. (60pts) Fig. 3
A dc test is performed on a 460-V. delta connected 100-hp induction motor. If VDC = 24 V and IDC = 80A. Explain how can we find the stator resistance R1 and then find it.
The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with a double-squirrel-cage rotor of design class C (high-starting-torque, low-starting current type): Test :No-load test at 60 Hz; Applied voltage V - 219 V line-to-line; Average phase current I, nl 5.70 A; Power Pnl -380 W; Test 2: Blocked-rotor test at 15 Hz; Applied voltage V 26.5 V line-to-line; Average phase current lbl 18.57 A; Power Pbl 675 W; Test 3: Average de resistance per...
Q10. A three phase, 100-hp, 2400V, 6-pole, 50 Hz induction motor is tested, with the following test results obtained: No-load test (at 50 Hz) Block-rotor test (at 12.5 Hz) 420 35 11500 Signal Voltage (V) 2400 Current (A) 10 Power (W) 4200 Stator resistance is measured at 1.75 Ω per phase. a) Find the parameters of the equivalent circuit b) At a slip of 0.25, calculate the power and torque output and the efficiency of this motor. Ans. : a)...
Example 6C: 15. Calculate the actual rotor speed, in rad/s, at maximum steady-state torque for the machine given in Example 6C for operation as a motor when connected to an electric source of (a) 120 Hz with twice rated voltage, (b) 60 Hz with rated voltage, (c) 30 Hz with one-half rated voltage, and (d) 6 Hz with 10 percent rated voltage. Example 6C. The parameters for the equivalent circuit shown in Fig. 6.8-1 may be calculated by using electromagnetie...