VII Международная студенческая научная конференция Студенческий научный форум - 2015

In this project16 kW induction motor was designed. The height of its rotation axis is 160 mm. The magnetic stator system is laminated and is presented as a stack of 0.5 mm sheets made of 2214 electrotechnical steel. Slots are semiclosed trapezoidal. Three-phase single-stacked bilayer concentric winding is placed in them.

The rotor is made with semiclosed slots. It is also laminated and presented as a stack of 0.5 mm sheets made of 2214 electrotechnical steel.

The designed engine meets the requirements of the specifications, as well as the GOST requirements both on energetic and trigger properties (efficiency - 90%, power factor - 0.9, starting torque ratio - 1.9, critical torque ratio - 3.2). Checkup calculations were performed for calibration (heat, ventilation, mechanical). According to the results heating of the engine parts is within acceptable limits, the fan provides the necessary air flow and shaft deflection does not exceed 10% set for induction motors.

In the research part the same engine was designed in a software package «AnsoftRMxprt». «AnsoftRMxprt» calculates all the parameters and engine characteristics analytically using solutions to equivalent circuits of the machine. When comparing the results of the engine calculations in «AnsoftRMxprt» and basic calculations using Kopylov’s technique the difference is minimal. That shows the relevance of «AnsoftRMxprt» implementation. Next on the basis of the data obtained in «AnsoftRMxprt» 2D model of the engine was created in «Ansoft Maxwell». «Ansoft Maxwell» allows us to calculate magnetic fields in the electromechanical transducer by finite-element method (numerical method). In this work asynchronous motor starting was modeled. Since the engine has two pairs of poles there is no use in considering the model in full. We can deal with only a quarter of the engine. In other parts the processes are similar. It significantly reduces the calculation time. As a result, we get a longitudinal analysis of the magnetic field and current density distributions in the rotor bars. The main advantage of «Ansoft Maxwell» is clarity, speed and calculation accuracy. That makes it an excellent tool for studying and research activities.

In the technological part of the project report the basic tests of induction motors are described, such as idling and short-circuit experience during check out and start up.

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