Method and circuit for protecting pulse signals of stepping motor from running risk

Abstract

The invention relates to a method and a circuit for protecting pulse signals of a stepping motor from running a risk. The method comprises the following steps that: time-delay characteristic time TNOD of a first phase pulse signal is skipped from 'valid' to 'invalid' at alternate time of two continuous shots to acquire a first phase pulse time-delay signal; time-delay characteristic time TNOD of a second phase pulse signal is skipped from 'invalid' to 'valid' to acquire a second phase pulse time-delay signal; the second phase pulse time-delay signal, the second phase pulse signal and the first phase pulse time-delay signal are subjected to logic operation to acquire a second phase pulse regular signal; and the second phase pulse regular signal and the second phase pulse signal are subjected to logics and operation to acquire a second phase risk protection pulse signal. The second phase risk protection pulse signal drives the stepping motor to effectively reduce the risks that the pulse signal of the stepping motor has a phenomenon of running a risk, thereby achieving the aim of improving the working performance of the stepping motor.

Description

technical field [0001] The invention belongs to the field of stepping motors, and in particular relates to a method for preventing the pulse signal risk of the stepping motor and a circuit for preventing the pulse signal risk of the stepping motor. Background technique [0002] Stepper motors can achieve speed regulation, fast start and stop, and forward and reverse control by changing the pulse frequency, so they are widely used. They have multi-phase windings, and each winding receives phase pulse signal sequences in a certain order to realize the circulation of each winding. Applying electricity causes the rotor to move in a specific way. The phase pulse signal sequence can be divided into multiple beats in one period. Common modes include single four-beat, double four-beat, single eight-beat and double-eight beat. When doing continuous stepping motion, its rotation speed maintains a corresponding relationship with the frequency of the input pulse. [0003] However, in...

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Problems solved by technology

[0003] However, in actual use, when two consecutive beats alternate, the phase pulse signal will cause inconsistency in the delay of the pulse signal due to problems such as the circuit itself and signal interference, and often overlap areas, resulting in pulse signals that should not be effective at the same time , but working at the same time will cause risky phenomena, which will make it difficult to improve the accuracy and frequency, reduce the life of the motor, and even damage the motor in severe cases. This risky phenomenon is especially prominent when high frequency and forward and reverse conversion

However, in the field of stepping motors, improving the circuit itself, reducing interference between signals and filtering measures, etc., are often costly and the effect is not significant

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