In order to study the impacts of the stator magnetic pull per unit area (MPPUA) characteristics under different field winding inter-turn short-circuit (FWISC) degrees in generator, comparative study of 3D numerical simulations and experiments are respectively taken to calculate the quantitative data of stator MPPUA by finite-element method (FEM) in this paper. Firstly, the nature exciting force of stator vibration, which is called MPPUA, is carried out. Then simulations data on MPPUA under normal condition and different short-circuit degrees are obtained. Finally, the variation rules of MPPUA characteristics by experiments under different conditions are studied. The results show that in normal condition the main harmonic components of MPPUA consist of only 6th-harmonic component. However, the occurrence of FWISC will bring in extra 1st, 2nd, 3rd, 4th and 5th-harmonic components to MPPUA. Meanwhile, with the increasing of the rotor short circuit degrees, the amplitudes of 1st, 2nd, 3rd, 4th and 5th-harmonic components will present an increasing trend. However, the amplitudes of 6th-harmonic component will present a decrease trend.

A special point was found in the frequency characteristics of the oscillatory circuit, which was not mentioned earlier in textbooks on electrical engineering and radio engineering. The module of complex resistance of the circuit does not depend on the value of the active resistance at a frequency less than  times that of the resonance. The material is of interest to all engineers and scientists specializing in electrical engineering. On its basis, new methods for measuring the parameters of electrical circuits can be developed. Physical interpretation of the phenomenon doesn't exist at the moment.

Experimental teaching is the main means to improve students 'practical ability and independent innovation ability, and open laboratory is the most basic teaching and scientific research environment for cultivating innovative ability and compound talents^[1,2]. In order to meet the needs of high-quality talents in our country, the Electrotechnics and electronics experimental teaching demonstration center has broken the traditional closed teaching system and learning methods, and has carried out open-ended experiments in order to cultivate students'independent learning ability and innovative spirit, improve students' enthusiasm of integrating theory with practice, and solve class-hour conflicts and time-consuming problems. Disadvantages such as fixed and idle experimental resources.

Electrical and electronic experiment teaching plays an important role in cultivating students in electrical majors. To this end, we must reform the traditional experimental teaching methods. Electric and electronic experiment teaching body Some measures to reform the teaching mode of soft experiment . real Practice results verify its effectiveness .

To realize the teaching goals in cultivating students’ability of conducting self-study,freely implementing of knowl- edge,developing scientific research skills,establishing team collaborative spirit,nurturing the innovative capacity and comprehensive quality,four universities led by Southeast University have conducted joint survey and design. Finally,we formulate the essential experi- ment teaching norms and standards regarding the required knowledge for experiment,experiment skills,technical methods for experi- ment,practice capacity and comprehensive qualification. The norms and standards have proven to generate fruitful and positive effects on experiment teaching.