сточники полезной тепловой мощности теплогенератора на базе асинхронного двигателя с полым перфорированным ротором

Анотація

SOURCES OF USEFUL THERMAL POWER

OF HEAT GENERATOR BASED ON ASYNCHRONOUS MOTOR

WITH HOLLOW PERFORATED ROTOR

N. Zablodskiy, V. Gritsyuk

Multifunctional electromechanical transducers belong to a new class of electromechanical devices and represent a combined technical system with polyfunctional properties that combines electromechanical, mechanical, thermal and hydraulic systems.

The research were carried out using theoretical and experimental methods, in particular, the theory of the electromagnetic field, the theory of the generalized electromechanical energy converter, numerical methods for solving differential equations. When analyzing the electromagnetic field and calculating the active wave resistance of an induction motor with a hollow perforated rotor, a finite element method of solving nonlinear partial differential equations in a three-dimensional formulation was used.

Losses in the massive rotor in the complex represent both losses in "copper" and losses in steel. Losses of active power in the stator, mechanical components and additional losses are dissipated into heat and, ultimately, also participate in forming the heating power of the heat generator.

The final dimensions of the active part of the asynchronous motor with a hollow perforated rotor in the axial direction cause the uneven distribution of the eddy current density and the increase in the active resistance of the rotor. Determination of the active wave resistance of a hollow perforated rotor taking into account the finite length and features of geometry is a complex problem, the solution of which is possible with the help of numerical methods in a three-dimensional formulation.

The active wave resistance of various design variants of ferromagnetic rotors can be determined by performing additional postprocessing calculations of a three-dimensional finite element model that allows analyzing the obtained results of the integral values of interest.

The dissipative energy component forming the useful thermal power is defined as the sum of the thermal losses in the active parts and mechanical assemblies of the asynchronous motor with a hollow perforated rotor, as well as the power losses due to viscous friction forces of the fluid in the air gap.