A kind of overload detection method of servo system and detection system thereof

Abstract

The invention relates to the field of motor overload detection. The invention discloses an overload detection method for a servo system and a detection system thereof. The running current of a servo motor is detected in real time, the voltage signal converted into a voltage signal is precisely rectified after resistance sampling and filtering, and an effective voltage value V is calculated after analog-to-digital conversion. RMS ; if V RMS >V n , V n is the voltage value corresponding to the rated current of the motor, then carry out the integral accumulation operation to obtain the accumulated value SUM; if SUM>MAX, and MAX is the set threshold, an alarm signal will be sent to control the servo motor to stop; if V RMS ≤V n , when SUM>0, perform integral desaturation operation, when SUM≤0, set SUM=0, and continue the operation in the next cycle, this method can improve the problem that the conventional overload protection of servo system is not reliable enough.

Description

technical field [0001] The invention relates to the technical field of motor overload detection, in particular to an overload detection method of a servo system and a detection system thereof. Background technique [0002] With the continuous development of power electronic technology and intelligent control technology, more and more servo systems are used in automation and other fields. Because the automatic production line has the characteristics of long continuous working time and large equipment load, the servo system often appears overloaded. The high-performance servo motor has a certain overload capacity, and short-term overload is allowed, but when the servo motor or servo driver In the event of a long-lasting overload situation, it is easy to cause the servo drive or servo motor to burn out, and may even cause serious safety accidents. Therefore, it is necessary to effectively monitor the overload operation status of the servo system. [0003] The commonly used ove...

AI Technical Summary

Problems solved by technology

Due to the characteristics of long continuous working time and heavy equipment load in the automated production line, the servo system often appears in an overload state. The high-performance servo motor has a certain overload capacity, and short-term overload is allowed, but when the servo motor or servo driver When there is a long-term and continuous overload situation, it is easy to cause the servo drive or servo motor to burn out, and may even cause serious safety accidents. Therefore, it is necessary to effectively monitor the overload operation status of the servo system

[0003] Under the existing technical conditions, the commonly used overload detection methods include temperature detection method, thermal overload relay method and current segmental detection and protection method. However, due to the hysteresis of the temperature curve in the temperature detection method, when a large load current suddenly appears without short circuit protection When the current threshold is reached, it is often too late to protect and cause damage; the thermal overload relay method needs to set the relay parameters, but due to the limitations of on-site construction conditions, the parameter setting is easy to be inaccurate, and the thermal overload relay is easily affected by the ambient temperature. Poor, often lead to protection failure; segment detection protection method is usually an integer multiple of the rated current for a specific time to protect, but due to the large segment interval, if the servo system runs between the low segment current and the high segment current , and close to the high-stage current, the system will still be protected with the low-stage current protection time at this time. Under this operating state, the accumulated heat will exceed the set value, resulting in protection failure

Therefore there is the problem that the overload protection is not reliable enough in the prior art

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