Electrical Machines

Question 2: Determine the steady state torque Determine the steady state torque for your vehicle. The steady state load is complex to obtain. It is recommended to identify relevant literature but you can try to calculate it. Some references are [1] and [2]. Answer the following questions: Obtain the steady state torque (calculated/from reference) Describe the process of obtaining the steady state torque for your vehicle (main experiments and or equations) What are the variables affecting the steady state torque? Can the steady state torque be approximated as a function? Plot the steady state torque using Excel or Matlab

A series motor, having an armature resistance of 0.1 Q and a field resistance of 0.15 Q, takes 48 A at 230V and 720 rpm. The total core and friction losses are 650 W. Neglecting stray-load and brush-contact losses, calculate (a) the developed torque, (b) output power at the shaft, and (c) the motor efficiency.

Justify your answer for the following questions: DC motors use permanent magnets to construct a static magnetic field. If a motor consumes 184 kW of power but only produces 231 HP at the shaft, itscurrent operating efficiency isanswer to the nearest one.% (1 Horsepower = 745.7 Watts). Round your c) Induction motors use commutators to transmit current to the rotor, thus producing a rotor magnetic field. A live reading of a motor indicates that it is consuming 16.4 kVA with a Power Factorof 0.76. You also know the current operating efficiency of the motor is 89%. What is theinstantaneous power output of the motor? (1 Horsepower = 745.7 Watts).%3D

Why would you prefer to place the field winding on the rotor of synchronous machine?Answer in not more than 2 sentence.

l: Find the current I, in the network given in the figure by using MESH ANALYSIS.

3.8. Three identical 9-MVA, 7.2-kV/4.16-kV, single-phase transformers are connected in wye on the high-voltage side and delta on the low voltage side. The equivalent series impedance of each transformer referred to the high-voltage side is 0.12+ j0.82 O per phase. The transformer supplies a balanced three-phase load of 18 MVA, 0.8 power factor lagging at 4.16 kV. Determine the line-to-line voltage at the high-voltage terminals of the transformer.

a. Provide a screenshot of your Simulink Block Diagram and controller. Provide your PID gains. c. Provide a screenshot of your output (using a scope). 1 Provide a screenshot of your control input (using a scope). Provide your overshoot in percentage and degrees. f. Provide your 1% settling time. Comment on the above process. What was easy and what was difficult? B(s)-For a system with the transfer function given by q(s)/v(s) = 50/2s+20sdesign a PID controller252+20sto rotate the system to a desired set point of 8 = 150°. Due to system constraints, you are only allowed to have an overshoot of 4% and need to have a 1% settling time of 0.5seconds. You will likely have to tune the PID gains of the controller to make this happen.

12) Your lab partner has built the circuit shown below. Identify 4 errors within the circuit.

Three single phase transformers are used to form a three phase transformer bank \text { - } 138 \mathrm{kV}(\Lambda) / 120 \mathrm{kV}(\mathrm{Y}) Source is a 120kV transmission line. ●Load side is a 12 MVA load at 0.8 Lagging PF. a. Turns ratio of each transformer. b. Line current at the 120 kV side.

Please select the coreect trand for the back-EMF(E) as field current (lf) charcateristic of a brushed DC machine under no load test (open-circuit test). Rising lf is performed before falling lf.