EEM3701 - Permanent Magnet Synchronous Machine - Engineering Assignment Help

Assignment Task

Experiment - Permanent Magnet Synchronous Machine A three-phase motor rated 1.1 kW, 220 V, 3000 rpm is fed by a PWM inverter as shown in Figure 2. The PWM inverter is built entirely with standard Simulink blocks. Its output goes through Controlled Voltage Source blocks before being applied to the PMSM block’s stator windings. The load torque applied to the machine’s shaft is originally set to its nominal value (3 N.m) and steps down to 1 N.m at t = x s. Two control loops are used. The inner loop regulates the motor’s stator currents. The outer loop controls the motor’s speed.

• The variable x is calculated as follows: x = (First number of your student number)/100
• Simulate the model, record and report on the results, and discuss the results. Particular the effect of the PWM inverters on the currents.

Starting a Synchronous Motor

When a synchronous motor is started, the excitation DC voltage is not applied to the field winding. The motor is started in induction machine mode with currents induced in the damper and field windings. A resistor is connected across the field winding in order to produce an acceptable field current and to limit voltage induced across the field winding. Then when speed reaches a preset value near synchronous speed, the field winding is connected to the DC voltage source and the motor synchronizes on the system frequency. In the synchronous machine model, the field winding terminals are not available. Instead, a Simulink signal representing the field voltage must be applied at the Vf input of the machine. Therefore if the Vf input is left unconnected, a zero field voltage is applied on the rotor. In other words, the field winding is short-circuited. In this example, the field current (idf) and a gain block (R start) are used to implement the resistance connected across the field winding. This experiment seeks to illustrate the starting procedure of a 60-kVA 400-V 50Hz synchronous motor with model

1. Simulate the model for varying values of the resistor (”R start”) from 0.5 pu to 2 pu with a step of 0.5.
2. Observe the the time it takes for the motor to lock into step at synchronous speed of 1 p.u.
3. Record and report on the results, and discuss the results.

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