Motor rotating speed adjusting circuit and device

Abstract

The invention discloses a motor rotating speed adjusting circuit and device. The motor rotating speed adjusting circuit is connected with a motor, and comprises a control module, a digital-to-analog conversion module, a voltage stabilization module, a rotating speed detection module and a voltage sampling module, wherein the voltage stabilization module outputs a driving voltage to drive the motorto rotate according to the output voltage of the digital-to-analog conversion module; the rotating speed detection module is used for converting a current pulse signal generated by the motor into a standard pulse signal and outputting the standard pulse signal to the control module; the voltage sampling module is used for sampling the driving voltage and outputting the sampling voltage to the control module; and the control module calculates and obtains the current rotating speed of the motor according to the standard pulse signal, and adjusts the output voltage of the digital-to-analog conversion module according to the current rotating speed, the preset rotating speed and the sampling voltage so as to further adjust the rotating speed of the motor, so that the real-time measurement andadjustment of the rotating speed of the motor and the closed-loop adjustment of the rotating speed of the motor are realized, and the accuracy in adjusting the rotating speed of the motor is ensured.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a motor speed regulating circuit and device. Background technique [0002] Currently known stirring paddle motor speed adjustment is mainly divided into two types: PWM type, that is, indirect voltage regulation type, and armature circuit series resistance type. Speed ​​measurement is mainly divided into two types: direct measurement and measurement related physical quantity calculation. The direct measurement method uses a photoelectric encoder or Hall sensor to directly measure the motor rotation cycle or frequency, and then achieve the purpose of measuring the motor speed. The measurement related physical quantity formula is to measure the working current and voltage of the motor in real time, and obtain the approximate value of the motor speed through calculation. [0003] The existing stirring paddle motor regulating and speed measuring devices mainly have the f...

AI Technical Summary

Problems solved by technology

[0004] 1. PWM speed regulation is not easy to intuitively read the relationship between duty cycle and speed, and if the PWM frequency is too high, it will easily cause radiation;

[0005] 2. The series resistance type of the armature circuit can only realize fixed gear speed setting, and it is difficult to realize stepless speed regulation;

[0006] 3. The structure of the direct measurement device is complicated, it is difficult to install and fix, and it is not easy to miniaturize, so it is difficult to measure the speed of the micro DC motor;

[0007] 4. The calculation formula of measurement-related physical quantities is easily affected by the load change of the motor, and the measurement accuracy is not high

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