Abstract
Relevance: All manufactured electric motors must undergo heating tests by the method of mechanical loading with continuous, short-term, repeated-short-time regimes. Variable electric drive tests are performed to define the performance of the engines at nominal, high and low speeds. DC motor and induction motor tests are performed on test benches with a power of 1000 kW and higher. Reducing of electrical losses and improving of energy efficiency of test stands is an urgent scientific and practical task so test time may take several hours. Objectives: The purpose of the article is the study of the test facility for thyristor rectifier – DC motor and transistor frequency converter – induction motor systems as well as a static equation derivation for a different operation regime and electrical losses and energy efficiency analysis. Methods Applied: The theoretical research was conducted with the help of methods of electrical engineering theory, electric machine theory, automatic control and automated electric drive theories. The calculation of the bench characteristics was carried out in Microsoft Office Excel software. Originality: Regulation parameters of the test stand were defined and coefficients of active and reactive power as a function of mechanical load were introduced to estimate energy efficiency. The derived equations make it possible to calculate energy efficiency of test facility depending on the rated power and mechanical load. Findings: the static mode equations were derived to calculate the active and reactive power coefficients of the test stand with and without energy recovery system for thyristor rectifier – DC motor and transistor frequency converter – induction motor systems. Practical Relevance: electrical power consumption of the test facility with thyristor rectifier – DC motor system with test motor rated power of 185 kW with energy recovery is reduced by 4.1 times as compared with the system without energy recovery. Electrical power consumption of the test facility with transistor frequency converter – induction motor system with test motor rated power of 200 kW with energy recovery is reduced by 5.4 times as compared with the system without energy recovery. The obtained analytical equations give the opportunity at the design stage to estimate the test bench energy efficiency as a function of the drive system type, motor power, operating regime and mechanical load.
Keywords
Electric motors, test benches, energy efficiency.
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