Micro-motor rotating speed measurement control system and method

Abstract

The invention discloses a control system and method for a rotating speed measurement control system of a micro motor, and the system comprises a motor, a first photoelectric gate, a second photoelectric gate, a circular grating, an exclusive-OR gate, a triode drive circuit, an analog voltage output unit, a counter, a speed setting unit, a PID operation unit, a speed conversion unit, and a speed display unit; the first photogate and the second photogate generate pulses with the phase difference of 90 degrees, and the exclusive-OR gate integrates the pulses into new pulses; the counter receivesthe pulse to form a count value; the speed conversion unit collects a current count value and subtracts the current count value from the value read last time to obtain increment, and the current rotating speed of the motor is obtained through calculation; the PID operation unit compares the motor speed with a set speed, establishes a buffer variable, and outputs a voltage for controlling the driving motor through the buffer variable; the triode drive circuit receives the output voltage to drive the motor. According to the system, the measurement resolution can be improved, so that the motor operates more stably and is closer to a set value more quickly.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a micro-motor speed measurement and control system and method. Background technique [0002] Almost all modern control systems are based on computer sampling control, which can only discretely sample the sampling objects, and the control amount can only be based on the deviation value of each sampling. Therefore, the integral term and differential term in the theoretical formula cannot be accurately calculated, and can only be approximated by the method of numerical discrete calculation. The PID control formula obtained through such processing is called a digital PID control formula. There are two types of digital PID control formulas: positional PID control formula and incremental PID control formula. [0003] The position-type PID control formula also has some disadvantages: due to the requirement to output the final result, it is easy to generate static errors, and the ...

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Problems solved by technology

[0003] The position-type PID control formula also has some disadvantages: due to the requirement to output the final result, it is easy to generate static errors, and the controller needs to accumulate the deviations during the operation, which makes the calculation workload of the computer heavy

In addition, since the output of the PID controller corresponds to the absolute position of the system actuator, if the computer malfunctions due to interference or program runaway, the output of the PID controller may change significantly. It will inevitably cause a large position change of the actuator

[0004] The incremental PID control formula has been improved on the positional PID control formula. However, if the output of the positional PID is directly used to control the motor without improvement and arrangement, it will not be able to control the motor at all, and even catastrophic consequences will occur, because All PID analysis is based on the fact that the actions of the controlled actuators are incremental to the process variables, and the change of process variables requires the participation of the actuators and time.

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