低失真教学用三相电源研究:在大学教学过程中，三相电源的配置往往难以满足教学需要并有其局限性。而常用的变频器因其谐波和造价等因素也不适合作为一般电学实验的电源。为此，通过文氏电桥、移相电路、功率放大器等组成的400Hz 三相电源装置较好地解决了实验用三相电源的问题。运行表明，该装置取得了满意的效果。关键词：三相电源；低失真；低谐波Abstract: In the university teaching, the three -phase power supply can忆t meet the teachings needs and has its limitation. The transducter is not appriciate to the general electricity experiment power source as well, for its harmonic and cost factor. So the 400Hz three-phase power supply device which is make up of Wien忆s bridge, shift phase circuit and power amplifier etc. can solve the experimental convention three-phase power source\'s question. The movementindicated that this equipment has obtained the satisfactory effect.Keywords: three-phase power supply; low distortion; low harmonic