System and control method based on STO (Safe Torque Off)

Abstract

The embodiment of the invention relates to the field of motor control, and discloses a system and control method based on STO (Safe Torque Off). The system based on STO in the invention comprises a controller, a main processor and a co-processor; the controller is separately connected with the main processor and the co-processor; the co-processor is independent of the main processor; the controller is used for sending an STO signal to the co-processor; the co-processor is used for specially responding to the STO signal, and controlling a motor to safely stop; the controller is also used for sending a motor running control signal to the main processor; the main processor is used for responding to the motor running control signal, and controlling the motor to run according to the running control signal; therefore, the response speed of a software redundancy processing system based on double processors onto the STO signal is relatively rapid; and thus, a safety accident can be effectivelyprevented.

Description

technical field [0001] The embodiments of the present invention relate to the field of motor control, in particular to a system and control method based on safe torque off. Background technique [0002] STO (safe torque off, safe torque off), in the transmission system composed of frequency converter (driver, servo drive, etc.) and motor, when the user or system safety function sends a safe torque off command on the drive, The inverter immediately removes the power to the rotating motor, stops the production process, prevents accidents, and improves the safety performance of the system. [0003] However, the inventors have found that at least the following problems exist in the prior art: in the prior art, the hardware multi-channel redundancy design method is used to improve the level of security, and due to the structural characteristics of the hardware circuit itself, only There are still defects in the processing ability of STO events that occur in real time. For the s...

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Problems solved by technology

[0003] However, the inventors have found that at least the following problems exist in the prior art: in the prior art, the hardware multi-channel redundancy design method is used to improve the level of security, and due to the structural characteristics of the hardware circuit itself, only Processing of real-time STO events, the processing ability is still flawed

For the software processing of Safe Torque Off, although it has a good supplement to the original hardware system in terms of processing capacity, because the processor has to deal with many events, it is very slow in responding to the STO signal and cannot be turned off quickly. The safety level is not enough, and it is difficult to effectively prevent the occurrence of safety accidents

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