Ph.D. thesis: 208 p., 3 tables, 72 figures, 11 appendixes, 128 references.
ELECTRIC MACHINES, DYNAMIC MEASUREMENTS, SPEED, ANGULAR VELOCITY, ENCODER, IDLE TEST, MICROCONTROLLER TACHOMETER, TRANSIENT CHARACTERISTIC OF THE ELECTRIC MACHINE, INSTANTANEOUS VALUES OF ANGULAR VELOCITY, MEASUREMENT RANGE, QUANTIZATION ERROR, ANGULAR SPEED MEASURING CHANNEL.
The purpose of the research is to increase the accurateness and expand the dynamic measuring of the parameters of rotational motion in transient modes of electric machines operation in the idle test.
To fulfill the goal, it is necessary to decide the following tasks:
• make an inspection of optical-electronic measuring converters of the parameters of the OR and give them classification;
• analyze the methods and means of dynamic measurements of rotational motion parameters;
• develop a generalized structural scheme of the microcontroller means of dynamic measurements with a highly sensitive encoder and digital signaling controller;
• develop a mathematical model for measuring the parameters of rotational motion in the dynamic mode of work of the measurement object;
• to study the impact on the process of transformation of uninformative parameters;
• develop angular speeds, angular acceleration and dynamic moment;
• deduce the equation of angular speed, angular acceleration and dynamic moment into a digital binaries;
• obtain analytics dependencies for the evaluation of the basic static and dynamic metrological characteristics of measuring instruments;
• develop a technique for the engineering design of dynamic measures and produce an experimental sample of the means of measuring the parameters of rotational motion;
• perform experimental research and confirm the adequacy of the results of physical and mathematical modeling.
The object of research is the process of dynamic measurements of rotational motion parameters, in particular angular velocity, angular acceleration and dynamic moment.
The subject of research is the methods and microprocessor means of dynamic measurements of the parameters of rotational motion in the conditions of the transient process of the electric machine.
Research methods. The basis of the dissertation work is a comparative analysis of the existing measuring converters of the parameters of the RM, methods of theory of the measuring transformation of non-electric quantities, methods of mathematical and physical modeling, theory of errors and control, theory of random processes, methods of mathematical statistics when processing the results of demolition, theory of differential equations.
The research is aimed at developing new methods and hardware and software products, processing and analyzing of the results of dynamic measurements, during testing of electric machines in the idle mode.
It is observed that the results of the study will contribute to a significant reduction of the time of testing of electric machines, the quality of quality and the efficiency of tests, and will help to improve the competitiveness of electric machines in the market of electrical products.
Scientific novelty of the obtained results:
1. Further development was achieved in the method for improving accuracy, distinguished from existing methods by minimizing dynamic error through exclusion of the clutch coupling transient process overlap onto the transient characteristic of the electric machine, and systematic error through the introduction of a corrective function for periodic systematic error of eccentricity.
2. For the first time, a normalization method for quantization and discretization errors during comparison of measured and reference quantities throughout the transient process of an electric machine has been developed, adapting the encoder resolution to instantaneous angular velocity values at each moment in time.
3. The method for concurrent measurement of angular velocity across its entire range of variation during the transient process has been enhanced to ensure uniform measurement conditions for angular velocity of an electric machine during each subsequent start, thereby ensuring reproducibility of dynamic measurements of its transient characteristics and reducing errors due to unstable stator winding voltage, achieved through consistent nominal values of amplitude, frequency, and initial phase.