ENERGY-SAVING CONTROL IN START-BRAKING REGIMES BY FREQUENCY-REGULATED PERMANENT MAGNETS SYNCHRONOUS MACHINE

  • Владимир Александрович Волков Национальный горный университет https://orcid.org/0000-0003-1262-3988

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.

Author Biography

Владимир Александрович Волков, Национальный горный университет

PhD, associate Professor, Doctoral Candidate National Mining
University

Published
2018-06-26
How to Cite
Волков, В. (2018). ENERGY-SAVING CONTROL IN START-BRAKING REGIMES BY FREQUENCY-REGULATED PERMANENT MAGNETS SYNCHRONOUS MACHINE. Electrotechnic and Computer Systems, (27(103), 91-102. https://doi.org/10.15276/eltecs.27.103.2018.10
Section
Automated electromechanical systems

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