International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Among the main problems of the induction furnaces are the clearly manifested worsened power factor during operation, the asymmetry, the deflection and the variance of the supply voltage in their power supply. Induction furnaces in all their operating modes are a non-linear load with significant and varying consumption of active and reactive energy. Compensation devices are set for the heaviest mode of operation – metal melting. There remains a question of the limits of the low inherent power factor for individual regimes, the size of the penalties for this on an annual basis, and the potential energy saving measures taking into account the possibilities of waste heat utilization. In this connection, the task of implementation of modern optimal management according to predefined criteria is current.

In the case of energy-efficient drives with induction motors, the tendency to implement optimally designed motors, combined with intelligent control, incorporating an integrated monitoring and diagnostics system, is becoming increasingly important. Induction motors in industrial systems operate with frequent starting, dynamic loads and sometimes unbalance of supply voltage. In order to maintain an optimal operating condition, reduce the number of failures and build up an optimal repair and maintenance system, it is important to have an advanced monitoring system coupled with fault identification techniques. The behavior of optimally designed three-phase induction motors designed to operate integrated into hydraulic units with continuous duty operating mode is considered

Paper deals with the dynamic behavior of pump unit electric drive. The electric motor, subject of development, is a new standard efficiency induction motor with squirrel cage rotor, designed to operate in continuous operation. The determination of operating characteristics of induction motor in dynamic modes is necessary to establish the properties of the machine in specific conditions. In some industrial areas can occur very often sags with a depth of between 10% and 15% of the rated voltage as a result of switching electrical loads on systems of users. As a result of simulation studies the influences of the supply voltage and total torque of inertia of the electric drive have been assessed on arising impact torques and currents and electric energy losses of electric drive for pump unit. The results obtained are in addition to experimental studies of the same motor. Some of the study results have been presented graphically. An analysis and conclusions from the results obtained have been done