Three-phase power supply default phase and power failure detection system and braking method

Abstract

The invention discloses a three-phase power supply default phase and power failure detection system and a braking method. The detection system comprises a three-phase power supply RST, a rectification circuit, a relay circuit, an IPM circuit, two optocoupler processing circuits, a DSP processor, a braking circuit, a Nixie tube and a servo motor and is applicable to a motor control system of a servo driver. The braking method comprises the following steps: judging abnormal conditions such as default phase and power failure of the three-phase power supply, then closing a PWM signal by the DSP processor, cutting off a busbar power supply by virtue of the relay circuit, starting and accessing the braking circuit, connecting a braking power resistor among three-phase windings of the servo motor in series for realizing short connection of the three-phase windings, and generating current in a short connection loop by virtue of residual magnetism potential of a stator winding, so that the motor is rapidly braked. The detection system and the braking method, which are disclosed by the invention, have the advantages that security protection effect on electrical equipment and personnel is realized, implementation is easy, cost is low, and the problems that a motor in existing electrical equipment adopts a band-type brake module, price is high, size is large and control and wiring are complex can be solved, so that the detection system and the braking method have a good application prospect.

Description

Technical field [0001] The invention relates to the field of industrial automation motor control, in particular to a three-phase power supply lack of phase, power failure detection system and braking method. Background technique [0002] At present, in many industrial automation occasions, the input three-phase AC power supply needs to be detected for lack of phase and power failure to prevent the motor running in the electrical equipment from being stopped in time due to inertia after a sudden power failure, resulting in damage to the electrical equipment, or even operation Casualties of personnel. In addition, when the motor is in an abnormal working state or needs an emergency stop, the brake module of the motor is mainly used for braking. However, the price of the brake module is relatively high. After the brake module is used, the volume of the motor will increase. In addition, the control wiring of the motor is more complicated, which is not conducive to the development of...

AI Technical Summary

Problems solved by technology

The circuit of the whole system is simple, easy to implement, and low in cost, which solves the problems of high price, large size, and complex control wiring of the motor brake module in the existing electrical equipment; it is especially suitable for motors below 2KW or motors with small inertia and phase loss. Electric braking has a good application prospect

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