Scientific and Technical Journal

ELECTROTECHNIC AND COMPUTER SYSTEMS

ISSN Print 2221-3937
ISSN Online 2221-3805
ENERGY-SAVING CONTROL IN START-BRAKING REGIMES BY FREQUENCY-REGULATED PERMANENT MAGNETS SYNCHRONOUS MACHINE
Abstract:
The article is devoted to the research of energy-saving control of a frequency-controlled permanent magnet synchronous machine, which provides reduction of the main electro-magnetic energy losses of this engine in the start-braking regimes. In the studies carried out, methods were used: variational calculus, mathematical analysis and mathematical interpolation, computer and simulation modeling. An analytical dependence is proposed for calculating the main power losses in the steel of this engine, taking into account the nonlinear nature of their variation from the rotor speed and convenient for solving optimization problems. A close to the optimal (called "quasi-optimal") trajectory of the change in the speed of a frequency-controlled synchronous machine is proposed and investigated, at which the lowest values ​​of the electromagnetic losses of the engine in the start-braking regimes are ensured. The proposed results include the proposed quasi-optimal trajectory of the speed of the this machine in the start-braking regimes, which ensures the lowest (in comparison with other trajectories) values ​​of electromagnetic energy lost in these regimes. Also, for the first time, the dependences for the main electromagnetic losses of energy of this engine on the duration of acceleration and deceleration times were applied for various types of control algorithms for this engine (with the zero value of the longitudinal projection of the stator current vector on the axis of the rotor magnetic field with the nominal modulus of the vector of the stator or by maintaining the maximum ratio of the electromagnetic moment of the motor to the modulus of the vector of its stator current) with linear, parabolic and quasi-optimal trajectories of speed variation in the start-braking regimes. The practical value of the obtained results consists in the quantitative estimation of non-productive energy losses for the considered engine in the start-braking regimes and in the reduction of energy losses in it due to the use of optimal acceleration and deceleration times for linear, parabolic and quasi-optimal velocity trajectories
Authors:
Keywords
DOI
http://dx.doi.org/ 10.15276/eltecs.27.103.2018.10
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15 Sept 2020

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