Simulation of dynamic operation characteristics of synchronous motors based on machine design Li Yan Su Xuejun Based on the
electromagnetic relationship of synchronous generators and the characteristics of dynamic operation of synchronous motors,
establish a mathematical model of the electromagnetic change law during dynamic operation of motors, and dynamically operate
synchronous motors The characteristics were simulated.
This article provides a theoretical basis for the optimal design of synchronous motors.Thesaurus The synchronous operation of the mathematical model of the dynamic generator is simulated as follows. The stator three-
phase windings are symmetrically distributed. The hysteresis loss and eddy current losses are ignored. The effects of ferromagnetic
saturation are not taken into account. A horizontal axis damping winding and a vertical axis damping winding are used instead.
The dynamic running process of a synchronous generator is a common faulty running state of a synchronous motor. If a short circuit
occurs at the armature outlet, the motor is in the transient short-circuit transition process from the moment of the short-circuit.
It can reach 10 of the rated current to generate a large electromagnetic force and electromagnetic torque inside the motor (braking
torque and alternating torque cause damage to the mechanical structure of the motor, and this process is determined by the parameters
of the motor itself Therefore, studying the dynamic operating characteristics of the motor is of great significance for optimizing the
design of the motor.
Structure of salient pole synchronous generator The structure and performance of salient pole synchronous generator are general, and
the conclusions obtained are easily generalized to the hidden pole machine.
In this paper, salient pole synchronous generator is taken as the research object.The figure is a simplified structure diagram of a salient pole synchronous generator. It has a three-phase armature winding, an excitation
winding and a damping winding, and the coordinate system has been marked in the figure. The positive direction of the voltage and
current in the motor is the stator winding. Positive current produces a negative flux linkage Rotor windings According to motor conventions,
forward current produces a positive flux linkage.
During the operation of the motor, especially in the dynamic process, the internal magnetic field distribution and the variation of the induced
potential are quite complicated. The structure of the salient pole synchronous generator is shown in the figure. The mathematical model of
the salient pole synchronous generator is based on the structure of the synchronous generator. With the internal electromagnetic relationship,
and the electromagnetic relationship during dynamic operation, the voltage equation of the synchronous motor in the ab coordinate system
can be obtained. One of the three-phase stator windings has less voltage in the exciting and damping windings, and the induction voltage
motor in each winding. Take technology as an example. Only a few publications fly.
Time chart Excitation winding current waveform chart Excitation winding current change rule conclusion One boat Xia Xingxiu Shiyao Limu 1
Zhou] Time chart horizontal axis damping winding current waveform From the simulation results, the armature winding current can It reaches
16 times of the rated current, and then gradually approaches the steady-state value. The initial value of the exciting current is that the
exciting current is close to the current waveform during stable operation. The simulation results are in good agreement with the experimental data.
This method of establishing a mathematical model of a synchronous generator has a clear logical concept, the motor parameters are not
time-varying, and are all dq parameters commonly used in engineering design. No transformation is required, and the method can be directly
used to find numerical solutions.
Moreover, it can be popularized in the hidden pole synchronous generator, which provides a theoretical basis for the optimal design of
synchronous motors.
References Gao Jingde and Zhang Ezheng edited the basic theory and analysis methods of motor transition process (volume 1).Basic Theory and Computer Algorithms of Synchronous Motor Operation, Hydraulic and Electric Power Press, Yudong Wang, editor of Electrical
Engineering (Zhejiang University Press, Zhang Zhiyong, etc., master and master Beijing Jing University of Aeronautics and Astronautics Press)
Vegetable grave, fresh grave, grave, congee, multi-python, sculpting, fight, final solution, spear tendon, Zhu Lai Xianqing, Sha Zhuxian, fresh
produce, spear, Zhuxian, Yihe, flute, prostitute Welcome to subscribe to Shanghai outstanding scientific and technological journal "Electrical
Technology" Electrical Technology "is a technical scientific and technical journal mainly based on motor manufacturing application technology
sponsored by Shanghai Electrical Technology Research Institute. Main reports Research achievements in the field of motor manufacturing at
home and abroad, new technologies, new processes, new equipment, new materials research and application, existing motor design, technical
exchanges, insulation topics, double innovations, motor tests, electric vehicle research, experience exchange, and Industry dynamics and market information.