A speed-measuring system of permanent magnet motor without speed with improved fuzzy control

Abstract

The invention discloses a fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system. The fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system comprises a PMSM module, a Clark conversion module, a Park conversion module, a voltage-and-current conversion module, an MRAS module, a first comparator module, a fuzzy controller module, a second comparator module, a first PI adjusting module, a third comparator module, a second PI adjusting module, a Park inverse conversion module, an SVPWM module and an inverter module; the fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system is used for detecting the position and the speed of a motor; in the actual running process, model reference self-adaptive control is that the actual running condition of the motor serves as a reference model, a motor model containing parameters such as the to-be-estimated rotating speed and a current serves as an adjustable module, an equation free of an unknown parameter serves as a reference model, the adjustable module is adjusted through a difference value between an actual measurement current and an estimated current of the motor, the estimated value tracks the actual value, an output difference value of the two models tends to be zero, and therefore the aim of the rotor stably runs is achieved.

Description

technical field [0001] The invention relates to the field of speed measurement without a speed sensor, in particular to a permanent magnet motor speed measurement system with improved fuzzy control. Background technique [0002] In the motor speed detection process, mechanical sensors have many shortcomings that are difficult to solve. For example: in some special working environments (high temperature, high pressure), the accuracy of the information it provides is not trustworthy; at the same time, the use of mechanical sensors will increase the cost of the motor control system and make maintenance difficult. At the same time, because conventional PI controllers generally have a problem-integral saturation. The so-called integral saturation means that when the system has a deviation in one direction, the integral link of the PI controller continues to accumulate, and finally reaches the limit value of the controller. Even if the integral action continues, the output of the...

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Problems solved by technology

However, during the desaturation time, the controller output is still at the limit value, and at this time, adjustment lag is prone to occur, resulting in poor system performance

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