Control method for direct current motor load at starting moment

Abstract

The invention discloses a control method for a direct current motor load at the starting moment. The control method comprises the following steps: an MCU single-chip microcomputer sending out a conduction control signal to control conduction of the motor load; when the hardware circuit detects that the current is too high, the hardware circuit cutting off the power supply of the motor load and feeding back an overcurrent signal to the MCU single-chip microcomputer; after the MCU single chip microcomputer reads the overcurrent signal, the MCU single chip microcomputer cutting off the conductioncontrol signal, and after short time delay, the MCU single chip microcomputer sending out the conduction control signal again to control the motor load to be conducted when the motor does not stop rotating; when the current value is no longer greater than the set maximum current value, the hardware circuit no longer cutting off the power supply of the motor load, and the motor starting to rotatenormally. According to the invention, inductive load characteristics of the direct-current motor are used for energy storage. A software and hardware matching mode is adopted, an MCU single-chip microcomputer software program periodically and rapidly pushes the motor to rotate for multiple times, the motor load is disconnected when the load power exceeds a certain value, the motor load is controlled to be switched on again after short time delay, and the steps are repeated for multiple times until the motor load is completely pushed.

Description

technical field [0001] The invention relates to a solution to the problem of excessive power of a DC motor load at the moment of starting, in particular to a method for controlling the DC motor load at the moment of starting, and belongs to the technical field of starting control of the DC motor load. Background technique [0002] DC motor is a very common motor in daily life. DC motor has been widely used in the industrial field because of its advantages such as good speed regulation performance, large torque and low maintenance cost. However, DC motor armature circuit resistance and inductance are both Smaller, and its rotating body has a certain mechanical inertia, so when the DC motor is powered on, the armature speed and the corresponding counter electromotive force are very small at the beginning of the motor startup, and the starting current is very large, up to 15% of the rated current. ~20 times, so in the case of insufficient power supply or insufficient setting of...

AI Technical Summary

Problems solved by technology

[0002] DC motor is a very common motor in daily life. DC motor has been widely used in the industrial field because of its advantages such as good speed regulation performance, large torque and low maintenance cost. However, DC motor armature circuit resistance and inductance are both Smaller, and its rotating body has a certain mechanical inertia, so when the DC motor is powered on, the armature speed and the corresponding counter electromotive force are very small at the beginning of the motor startup, and the starting current is very large, up to 15% of the rated current. ~20 times, so in the case of insufficient power supply or insufficient setting of the DC motor hardware drive circuit capacity, the DC motor may not be able to start; there are currently two solutions to this problem: series resistance start and reduced voltage start; Resistive start is to put variable resistors in series in the armature circuit, and short-circuit step by step during the start-up process to limit the start-up current to the allowable value, but this solution needs to be modified in the motor armature circuit, and is not suitable for MCU single-chip microcomputer control The occasions where the DC motor drive circuit is turned on and off; and the reduced voltage startup needs to use a separate adjustable voltage DC power supply to supply power to the motor armature, which is also not suitable for the occasion where the MCU single-chip microcomputer is used to control the on-off of the DC motor drive circuit

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