| Research shows that over the past 30 years of multi-phase induction motor speed control system has a strong competitive ability. Multi-phase induction motor compared with the three-phase induction motor, by increasing the number of low voltage to achieve large-capacity magnetic momentum and the wave is well improved, rotor current near-sinusoidal and power loss decreased, so that the motor torque Pulse reduced electromagnetic noise reduction and efficiency improvement. In the stator windings of the missing, multi-phase induction motor can reduce the scale to continue to run, thereby enhancing the operational reliability Currently, it has been on the submarine propulsion system was successfully applied, but as a new technology, and its control method in theory and in practice there are still a lot to be studied and discussed the issue.First of all, this paper analyzed the three-phase induction motor principle, the use of space coordinate conversion method to achieve the model of the electrical system and the complete decoupling were analyzed. Three-phase induction motor to the base, and further listed on abc, d-q andα-βcoordinate the multi-phase induction motor inductance matrix, voltage formula and torque formula, using these equations established a multi-phase induction motor in d-q coordinate system The mathematical model, and use the model simulation. In the establishment of multi-phase motors based on the mathematical model, with symmetrical distribution of the five-phase induction motor windings and a double-three-phase induction motor for example, derived motor model in the coordinates of coordinate transformation formula.The results show that multi-phase induction motor in theα-βcoordinates and d-q coordinate with the three-phase induction motor model is the same, for the three-phase motors will mature high-performance vector control strategies used in multi-phase electrical system provides a theoretical Basis.Finally, multi-phase induction motor to the object model for the simulation and calculation and analysis of the simulation results. Coordinate system transformation through the formula, in synchronous rotation coordinates (d-q), we established a five-phase induction motor model, and as the basis for the vector control system model; Star access to the stator of the five-phase induction motor for the object, we state the three fault simulation and calculation;To the six-phase induction motor for the object, DC brake on the simulation and calculation.Through the simulation results of the analysis, draw some useful conclusions, the simulation results show that the multi-phase induction motor than the traditional three-phase motors have a better dynamic and static performance.
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