Main loop arrangement structure of three-phase alternating-current motor driving system controller

Abstract

The invention discloses a main loop arrangement structure of a three-phase alternating-current motor driving system controller. The structure comprises a power module with positive and negative busbars and a support capacitor. The positive and negative busbars of the power module and the positive and negative busbars of the support capacitor are respectively connected by bolts and inserts to forman inversion main loop; positive and negative busbars of the power module extend to the positions of the bolts and the inserts along the mounting plane. The positive and negative busbars of the support capacitor horizontally extend towards the power module and then are vertically bent to the mounting plane; and the positive and negative busbars of the support capacitor extend to the positions of the bolts and the inserts along the mounting plane. The positive and negative busbars of the power module and the positive and negative busbars of the support capacitor are arranged in the same direction of the bolt and the insert, and the positive and negative busbars of the power module and the positive and negative busbars of the support capacitor are connected through the bolt and the insert respectively at the bolt and insert positions. According to the structure, surge voltage caused by stray inductance is reduced, the risk that the power module is broken down is avoided, the switching characteristic of the power module is ensured, and the reliability of motor driving control is improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a main circuit layout structure of a three-phase AC motor drive system controller. Background technique [0002] In the three-phase AC motor drive system, the high-frequency carrier is used to drive the power module with high-speed switching tubes, and the surge voltage proportional to the stray inductance of the driving main circuit will be loaded on the power module. The surge voltage V 1 The calculation is as formula (1): [0003] [0004] in, [0005] but [0006] In the formula: L is the stray inductance, φ is the magnetic flux, I is the current, B is the magnetic induction intensity, a is the length of the main circuit connection terminal busbar, w is the main circuit connection terminal busbar width, and h is the spacing of the laminated busbars , μ 0 is the vacuum permeability. [0007] It can be seen that minimizing the stray inductance reduces the surg...

AI Technical Summary

Problems solved by technology

[0009] In the main circuit, due to the stray inductance of the bolt area A and the area B on both sides, it seriously affects the switching characteristics of the power module and reduces the reliability of the motor drive control

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