Research on Low-Voltage MW-Rated Multi-Branch Induction Motor
|Title||Research on Low-Voltage MW-Rated Multi-Branch Induction Motor|
Conventional large-sized mechanical equipment is usually driven by high-voltage induction motor, and it usually adopts high-voltage converter in the state of needing frequency control. The main problem of this method is that the output waveform of high-voltage converter is not very smoothing and it will make much harmonic pollution to power grid, and the cost of power electronic devices in high-voltage converter is too much, so the high-voltage converter is expensive; what is more, the series connection of electronic devices in high-voltage converter is not reliable; for the induction motor itself, a mainly problem of induction motor is that its efficiency and power factor are mutually related to the load and decreasing obviously in the state of low load rate.However, the application of low-voltage converter which has good output waveform is widespread, based on asynchronous motor winding structure, this paper reports that the large power conventional induction motors (CIM) are designed to low-voltage large power multi-branch induction motor(MBIM), and each branch is dispersed to independent three phase symmetrical system which driven by low-voltage converter, the cost performance of the induction motor drive system will be increased observably. In this paper, compared to CIM, the principles and special structure of MBIM are discussed; the electromagnetic relationship in the motor is analyzed; the excitation reactance , stator leakage reactance of different number branches and mutual inductance between each branches are calculated; based on the mathematical model of MBIM, the transient simulation of switch is implemented, the effect to the motor when each converter is out-sync is analyzed, what is more, by means of designing 15kW, 6 poles and 6 branches prototype motor, its design characteristic is concluded; the parameter test and performance test prove the validity of theory analysis.The simulation and experiment results were given to verify the validity when the motor is designed to multi-branch induction motor, the larger control current produced by low-voltage high-power will be dispersed by its multi-branch, in this case, the control current of MBIM is reduced obviously, thus some low voltage converters could be used to drive MBIM. The performance of partial working branches MBIM will be better than CIM working in light-load state.
|Subject||Induction motor, Low-voltage MW-rated, Multi-branch, Multi-converter,|
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