Method for improving quick-break protection performance of asynchronous motor

The invention discloses a method for improving quick-break protection performance of an asynchronous motor. The method comprises the steps that a device automatically optimizes a constant value; measuring the electrical quantity of the motor in operation; the quick-break protection constant value is continuously optimized, so that the device constant value is optimal; according to the method for improving the quick-break protection performance of the asynchronous motor, the purpose of reducing a quick-break protection current constant value is achieved, so that it is ensured that a fault is rapidly removed when the motor breaks down, and a novel nonlinear fractional order PID sliding mode surface is constructed in combination with a nonlinear function; the problems of low control precision, low response speed and the like of the traditional fractional order PID sliding mode surface in a sliding state are solved; a sliding mode reaching law is used by using a self-adaptive superhelix algorithm, so that the con