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.

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.

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.

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)

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