Motor forward and reverse rotation control system with dual-protection function

Abstract

The invention provides a motor forward and reverse rotation control system with a dual protection function. The system comprises a starting control circuit, an operation control circuit and a power supply; the starting control circuit comprises a starting selection module, and the operation control circuit comprises a forward rotation control circuit and a reverse rotation control circuit which are connected with the starting selection module. According to the invention, the forward rotation and reverse rotation time control is achieved through the 555 timer, under the condition that the limiting switch is abnormal, power supply of the motor can be cut off after the forward rotation and reverse rotation time of the motor exceeds the set longest time, and the effect of dual protection of the motor is achieved. The delay time of the 555 timer can be adjusted through a resistor, so that the forward and reverse rotation time of the motor can be adjusted; software control is not needed, andmotor forward and reverse rotation control with dual protection and adjustable time can be achieved only through a simple classic hardware circuit.

Description

technical field [0001] The invention relates to a motor forward and reverse control system with double protection functions. Background technique [0002] Due to its excellent performance, convenient control, and simple operation, DC motors are widely used in fields that require precise control in various industries; Stop, and only use the limit switch to control the stop of the motor, there are many disadvantages in use, as follows: a main control chip (such as a single-chip microcomputer), many power conversion circuits, large-scale relays, and related software control algorithms need to be compiled To realize the forward and reverse rotation and logic control of the motor, the volume of the circuit is large and the cost is high; when the motor stops, only the limit switch hardware is used to stop the motor. If the limit switch is damaged, the motor may be blocked and damaged. Contents of the invention [0003] In order to solve the above technical problems, the present...

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Problems solved by technology

[0002] Due to its excellent performance, convenient control, and simple operation, DC motors are widely used in fields that require precise control in various industries; Stop, and only use the limit switch to control the stop of the motor, there are many disadvantages in use, as follows: a main control chip (such as a single-chip microcomputer), many power conversion circuits, large-scale relays, and related software control algorithms need to be compiled Realize the positive and negative rotation and logic control of the motor, the circuit is large in size and high in cost; when the motor stops, it only depends on the limit switch hardware to stop. If the limit switch is damaged, the motor may be blocked and damaged.

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