环形变压器的设计计算（Design and calculation of ring transformer）.docVIP

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环形变压器的设计计算（Design and calculation of ring transformer）.doc

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环形变压器的设计计算（Design and calculation of ring transformer）

环形变压器的设计计算（Design and calculation of ring transformer） Design and calculation of ring transformer By designing a power transformer for 50Hz quartz lamps, The primary voltage U1=220V, U2=11.8V secondary voltage, secondary current I2=16.7A, voltage adjustment rate of U is less than or equal to 7%, to illustrate the method and steps of calculation. 1) calculate the secondary power of transformer P2 P2=I2U2=16.7 * 11.8=197VA (5) 2) calculation of transformer P1 power input (with transformer efficiency and input current of I1 =0.95) Type: K - coefficient and transformer power related, K=0.6 to 0.8, take K=0.75; according to the existing core specifications choose iron core size: high H=40mm, diameter Dno=55mm, outer diameter Dwo=110mm. Type: F - power frequency (Hz), f=50Hz; B - magnetic flux density (T), B=1.4T. N2=N20 * U2=3.23 * 11.8=38.1 turn, take N2=38 turns. 6) select wire wire diameter winding wire diameter d according to formula (10) calculation formula: I - through the wire current (A); J - current density, j=2.5 to 3A/mm2. When taking the j=2.5A/mm2 era, enter (10) have to use two d=2.12mm (consider the largest outer diameter of insulating paint 2.21mm), and traverse the wire. Because the cross-sectional area of Sd2=6.78mm2 Phi 2.94 wire, and the wire cross-sectional area d=2.12mm 3.53mm2 two parallel curdlan cross-sectional area: 2 * 3.53=7.06mm2, fully meet the requirements and a larger margin. Calculation of winding ring transformer structure 6 ring transformer is the use of wire winding machine ring rotates in a core and winding, so the core diameter size is very important to the process, the structure calculation of the purpose is to test all around after winding, the diameter of Shang Yuduo space. If the space is too small diameter winding does not meet the requirements, you can modify the core size, as long as the same cross-sectional area is maintained, the electrical performance is also basically unchanged. The core diameter of the known core is Dno=5