PI control based direct-current motor speed regulation control system and control method

Abstract

The invention relates to a PI control based direct-current motor speed regulation control system and a control method. A control center module receives signals from a key module and a direct-current motor module with an encoder in a unidirectional manner and transmits signals to a display module and a motor driving module in a unidirectional manner, and the motor driving module transmits signals to the direct-current motor module with the encoder in a unidirectional manner. A revolution rate of a motor is preset with keys, the control center module sends signals to the motor driving module and generates PWM waves, and the motor driving module drives the direct-current motor to rotate. The encoder measures the revolution rate of the direct-current motor and feeds the revolution rate back to the control center module. A control center compares the set rate with the measured rate, so as to obtain speed difference. PI control is carried out according to the speed difference, the duty ratio of the PWM waves is changed, finally, the measured rate is enabled to be close to the set rate, and thus, speed regulation control on the direct-current motor is achieved. Information such as the duty ratio of the PWM waves, the set rate, the measured rate and current P and I coefficients is displayed on the display module.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a PI control-based DC motor speed regulation control system and control method. Background technique [0002] DC motors have a wide range of applications. How to control and adjust the speed of the motor is one of the problems to be solved in the field of engineering and experiment. Usually the PWM wave is used to control the speed of the motor, and the speed of the motor is adjusted according to the duty ratio of the PWM wave. However, in experiments and practical applications, it is often found that the speed of the motor cannot reach a given PWM wave with a fixed duty ratio. steady speed. Therefore, the classic PID control is used to control the motor. In PID control, P is a proportional coefficient, so that the motor speed reaches the set value as soon as possible. However, the parameters of P, I, and D vary widely, and it is difficult to find suitable parameter...

AI Technical Summary

Problems solved by technology

Usually the PWM wave is used to control the speed of the motor, and the speed of the motor is adjusted according to the duty ratio of the PWM wave. However, in experiments and practical applications, it is often found that the speed of the motor cannot reach a given PWM wave with a fixed duty ratio. steady speed

Therefore, the classic PID control is used to control the motor. In PID control, P is a proportional coefficient, so that the motor speed reaches the set value as soon as possible. However, the parameters of P, I, and D vary in a large range, and it is difficult to find suitable parameters.

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