Motor back electromotive force energy feedback and discharge system

Abstract

The invention relates to a motor back electromotive force energy feedback and discharge system. The system comprises a power supply, a direct-current driver circuit and a motor which are connected insequence. The direct-current driver circuit comprises a voltage control unit, a bus current detection unit, a comparison and judgment unit, an energy discharge unit and a power inversion unit. The voltage control unit is connected with the bus current detection unit, the comparison and judgment unit and the energy discharge unit, the bus current detection unit is respectively connected with the power supply, the comparison and judgment unit and the power inversion unit, the energy discharge unit is connected with the power inversion unit, and the power inversion unit is connected with the motor. Compared with the prior art, the system has the advantages that energy can be effectively discharged, bus voltage is prevented from being too high, part of energy can be fed back to a battery system, and reasonable reutilization is achieved.

Description

technical field [0001] The invention relates to a power system, in particular to a system for feedback and discharge of back electromotive force energy of a motor. Background technique [0002] With the rapid development of AGV and RGV cars in the warehousing and logistics industry, the use of power systems composed of batteries and DC drive systems is becoming more and more common. If the back electromotive force energy brought by the high acceleration and deceleration movement of the DC drive system is not dealt with effectively, a series of difficult problems will arise: [0003] (1). The back EMF energy is not released, but only depends on the feedback and absorption of the battery itself. When a large current is fed back into the battery system, the internal management system of the power battery will have protective measures to suppress the inrush of large current. This will cause the voltage of the battery and the busbar of the driver to increase instantaneously, wh...

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Problems solved by technology

This will cause the voltage of the battery and the busbar of the driver to increase instantaneously, which may cause the system to overvoltage alarm and fail to operate normally.

In more serious cases, it will cause the drive components to withstand insufficient voltage and damage the breakdown

[0004] (2). The situation where the back EMF energy is completely released and absorbed

At present, in the AC servo system, there is a method of rectifying and feedbacking the front end of the AFE to directly feed back the back EMF energy to the AC grid without dissipating the dissipation resistor to achieve the purpose of saving energy. However, the cost of this solution is currently high, and its circuit topology is as follows: figure 1 As shown, it is generally used in AC frequency conversion speed regulation systems with high power and large inertia

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