1 Build an analytical induction machine IM model in synchron

1. Build an analytical induction machine (IM) model in synchronous reference frame and simulate the free acceleration in Matlab/Simulink or Matlab ODE function. Plot Te and wm. Compare your results with those in the reference paper Ind_machine_modeling_200810.pdf You can also find the induction machine parameters in the reference 2. Computer the initial values of state variables for the IM model. Use the initial values as the starting point. Do simulation using the same model in item (1) to obtain flat start. At t=2s, apply a torque increase. Answer: how much torque increase can make the system not work. Show your simulation results as validation.

Solution

An asynchronous motor type of an induction motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor as are found in universal, DC and synchronous motors. An asynchronous motor\'s rotor can be either wound type or squirrel-cage type.

Three-phase squirrel-cage asynchronous motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.