Method and device for discharging residual voltage of bus of servo controller

Abstract

An embodiment of the invention discloses a method and a device for discharging residual voltage of a bus of a servo controller. The method includes: detecting input voltage input into a rectifying module of the servo controller by an external power supply; judging that the servo controller is powered off when the input voltage is zero; controlling a discharging loop bridged on the bus to be connected when the servo controller is powered off and discharging electricity for a bus capacitor bridged on the bus; and detecting voltage of the bus capacitor and disconnecting the discharging loop after voltage of the bus capacitor is reduced to a safe voltage value. By adopting the method and the device for discharging residual voltage of the bus of the servo controller provided by the embodiment, after the servo controller is powered off by accidents, electric energy stored on the bus capacitor can be discharged fast, and voltage on the bus capacitor can be fast reduced to be below the safe voltage value, so that operators are prevented from suffering from electric shock and safety hazards are avoided.

Description

technical field [0001] The invention relates to the field of servo controllers, in particular to a method and device for discharging residual voltage of a servo controller bus. Background technique [0002] The servo controller is a device used to control the servo motor (motor). Generally, the servo motor is controlled by three methods of position, speed and torque to achieve high-precision positioning of the transmission system. From the structural point of view, the servo controller is similar to the frequency converter, but the precision and reliability of the components are higher. At present, the mainstream servo controllers all use digital signal processor (DSP, Digital Signal Processing) as the control core, which can realize relatively complex control algorithms and realize digitization, networking and intelligence. The servo controller is also the core of the servo system, and its precision determines the overall precision of the servo control system. [0003] Th...

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Problems solved by technology

[0005] This is a current function of the bus capacitor and the discharge circuit. However, we found that when the servo controller is powered off for some reason, the energy stored in the bus capacitor is released slowly, and it takes a long time to wait for the release to a safe voltage. When the voltage is not reduced to a safe value, it is easy to be shocked by electric shock when operating the terminals (the two ends of the bus capacitor have lead-out terminals, and the electric energy on it can be used by other equipment), and the safety hazard is very prominent.

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