Project 1

a)

Start up behaviour at w=0.

• rotor speed =377 rad/s
• on appying load speed decreases and after removal of load it again increases.
• In stationary reference frame, Vds and Vqs are having constant frequency of 60 Hz. Itwill not change when the load is applied.
• In stationary reference frame, Idr and Iqr are dependent on load.
• If there is no load the value= 0.
• Ids and Iqs have the frequency of 60 Hz.

b)Start up behaviour of induction motor represented in synchronous reference frame where w=wsyn

• wsyn = 120f/p= (120*60)/4
  • = 1800 rpm

=((2*3.14)/60)*1800 = 188.5 rad/s

In synchronous reference frame, Idr and Iqr are dependent on load. If there is no load the value is 0. Ids and Iqs have the frequency of 30 Hz.

c) Start up behaviour of induction motor

w=wr or the rotor speed

In rotor reference frame, Idr, Iqr,Ids and Iqs are having constant value in steady state. Without load, Idr and Iqr remain zero in steady state. Iqs increases when load torque is applied.

d)

Rotor Flux Reference Speed = slip*wr = ((ws - wr)/ws ) * wr

In rotor flux reference frame, Vds and Vqs are having variable frequency