TAILIEUCHUNG - Electric Machinery Fundamentals Power & Energy_6

Tham khảo tài liệu 'electric machinery fundamentals power & energy_6', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Vệ 2 640 V 1280 V Since the machine is A-connected VL V 1280 V . 4-4. A three-phase Y-connected 50-Hz two-pole synchronous machine has a stator with 2000 turns of wire per phase. What rotor flux would be required to produce a terminal line-to-line voltage of 6 kV Solution The phase voltage of this machine should be Vộ VL m 3 3464 V . The induced voltage per phase in this machine which is equal to V at no-load conditions is given by the equation Ea yỊĩnNCộf so 0 j2nNcf yf2n 2000 t 50 Hz W 4-5. Modify the MATLAB program in Example 4-1 by swapping the currents flowing in any two phases. What happens to the resulting net magnetic field Solution This modification is very simple just swap the currents supplied to two of the three phases. M-file M-file to calculate the net magetic field produced by a three-phase stator. Set up the basic conditions bmax 1 Normalize bmax to 1 freq 60 60 Hz w 2 pi freq angluar velocity rad s First generate the three component magnetic fields t 0 1 6000 1 60 Baa sin w t . cos 0 j sin 0 Bbb sin w t 2 pi 3 . cos 2 pi 3 j sin 2 pi 3 Bcc sin w t-2 pi 3 . cos -2 pi 3 j sin -2 pi 3 Calculate Bnet Bnet Baa Bbb Bcc Calculate a circle representing the expected maximum value of Bnet circle cos w t j sin w t Plot the magnitude and direction of the resulting magnetic fields. Note that Baa is black Bbb is blue Bcc is magneta and Bnet is red. for ii 1 length t Plot the reference circle plot circle k hold on Plot the four magnetic fields plot 0 real Baa ii 0 imag Baa ii k LineWidth 2 plot 0 real Bbb ii 0 imag Bbb ii b LineWidth 2 105 plot 0 real Bcc ii 0 imag Bcc ii m LineWidth 2 plot 0 real Bnet ii 0 imag Bnet ii r LineWidth 3 axis square axis -2 2 -2 2 drawnow hold off end When this program executes the net magnetic field rotates clockwise instead of counterclockwise. 4-6. If an ac machine has the rotor and stator magnetic fields shown in Figure P4-1 what is the direction of the induced torque in the machine Is the machine acting .

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