电缆参数对变频驱动电机轴电压和轴电流的影响

doi:10.19595/j.cnki.1000-6753.tces.231160

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Abstract

The common-mode voltage output by the inverter drive motor system, through the coupling of the motor capacitances, induces bearing voltage which brings electrical corrosion of the bearing and endangers the operation of the motors. In the frequency conversion drive system, the frequency converter and the motor are generally connected by cables. There are different types of cables, such as shielded and unshielded cables. The type and length of cables will affect their equivalent electrical parameters. The influence of cable parameters on the bearing voltage is currently unclear, and the key parameters of the cable that affect the motor bearing voltage are still uncertain. In this paper, the influence type and length of cables on bearing voltage will be analyzed. It provides a basis for the design and selection of the cable of the frequency conversion system to suppress the bearing current and bearing voltage.
Firstly, the mechanism of high frequency bearing current generation of motor in variable frequency drive system is analyzed, and the common-mode equivalent model of motor and cable system is established. Secondly, taking a 5.5kW induction motor as an example, the electrical model parameters of the cable and motor are extracted through the impedance test curve. The impedance characteristics of the cable and motor composition system are verified. An unshielded cable with 3m, a shielded cable with 3m and a shielded cable with 10m are used to comparing. The influence of cable type and cable length on motor bearing voltage and bearing current are studied through circuit simulation. Finally, a bearing current test platform is built to test the bearing voltage and bearing current of the motor and cable system for the above different cables, the accuracy of the model and the correctness of the simulation analysis results are verified, and the corresponding suppression scheme is given for the motor bearing voltage and bearing current problems of the frequency conversion drive system.
According to the simulation results, compared with the 3m unshielded cable, the stator ground current of the 3m shielded cable increases by nearly 25%, and the bearing voltage and bearing current decrease by 5%. When the length of the shielded cable increased from 3m to 10m, the bearing voltage reduced by 11%, but the stator ground current increased by 14%. The test results are similar to the simulation results, that is, the shielded cable or the length increasing will reduce the bearing voltage and bearing current, and the stator ground current will increase. The motor circulating bearing voltage of 3m shielded cable increased by 21% compared to 3m unshielded cable. Combined with the analysis of different cable model parameters and experimental results, it can be seen that the decrease of motor bearing voltage and bearing current is mainly caused by the increase of cable parasitic capacitance.
The following conclusions can be drawn from simulation and test results: (1) Cable parasitic capacitance is the key parameter that affects the bearing voltage and bearing current. Increasing the parasitic capacitance parameter can reduce the motor bearing voltage and bearing current. (2) Compared with unshielded cables, shielded cables increase the parasitic capacitance parameters of the cable, and reduce the impedance of the common-mode circuit, which will lead to the stator ground current and the circulating bearing voltage increasing. (3) For the cables which length does not cause voltage reflection, the longer cables will increase the stator ground current, but decrease the bearing voltage and bearing current.

Key words： Variable frequency drive shielded cable bearing voltage bearing current grounding current

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	Chen Like
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Cite this article:

Chen Like,Liu Ruifang,Li Zhihao等. The Influence of Cable Parameters on the Bearing Voltage and Bearing Current of the Variable Frequency Drive Motor[J]. Transactions of China Electrotechnical Society, 0, (): 9038-38.

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