Determine electromagnetic torque and shaft-output torque

Assignment Help Electrical Engineering

Reference no: EM13291300

1) A 40-hp, 500 V, 1200-rpm DC shunt motor has rotationallosses of 2000 W at rated speed. The armature resistance is 0.46Ω and the field resistance is300Ω. A) Calculate the armature current when the motor is delivering rated load at rated voltage andrated RPM. B) Determine the
electromagnetic torque, shaft-output torque, and efficiency ofthe shunt wound motor.

2) A 15 hp, 440 V, 1250 rpm separately excited dc motor drawsan armature current of 30 A at rated load. The no-load armature current is 5.0 A. Thearmature resistance is 0.75 Ω. Consider that the rotational losses (core + mechanical) areproportional to the speed. Neglect the field winding losses. The field current is kept constant and themachine is not saturated. For a 360 V armature voltage, the recorded shaft speed is 1000 rpm. Find:A) The value of the armature current and type of operation of the machine(motor/generator); B) The electromagnetic
(induced/converted) power and torque; C) The shaft power andtorque; D) The efficiency of the machine; E) What would be the shaft speed and torque requiredfor the machine to supply (generator mode) 15 hp to a 440 V dc bus? Any problems withthis operating condition?

Reference no: EM13291300

Questions Cloud

What is the present value of your winning lottery ticket : You have just won a lottery! You will receive $50,000 a year beginning one year from now for 20 years. If your required rate of return is 10%, what is the present value of your winning lottery ticket?

Explain the reactants present write possible half cell : Suppose you have two joined metals (Gold and Copper(II)) immersed in 1 M HCl acid, based on the reactants present write possible half cell (anode/cathode) and full cell reaction(s).

What are the dangers and disadvantages of using a financial : Corporate financial plans are often used as a basis for judging subsequent performance. What can be learned from such comparisons? What problems might arise and how might you cope with sucj problems?

Find the magnitude and direction of the rockets acceleration : A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 61.0° above the horizontal, Find the magnitude and direction of the rockets acceleration

Determine electromagnetic torque and shaft-output torque : A 40-hp, 500 V, 1200-rpm DC shunt motor has rotationallosses of 2000 W at rated speed. The armature resistance is 0.46Ω and the field resistance is300Ω. A) Calculate the armature current when the motor is delivering rated load at rated voltage and..

Compute the concentration of hy3- in a solution : Calculate the concentration of HY3- in a solution prepared by mixing 10.00mL of .010M VOSO4, 9.9mL of .010M EDTA and 10.00mL of buffer with a ph of 4.00

Compute the combined projected annual cash flow : Compute the combined projected operating gains/losses over the five-year horizon as the discounted present value of change in cash flows (using 14% as the discount rate), which is due to the pound appreciation and yen depreciation.

Determine the surface charge density on each plate : A parallel-plate air capacitor has a capacitance of 400pF and a charge of magnitude 0.250uC on each plate. The plates are 0.600mm apart. What is the surface charge density on each plate

What encryption mechanism is used in the cquroam : What wireless security type does CQUniversity implement to enable roaming? Explain how this wireless security type work and what encryption mechanism is used in the CQURoam? Explain how this mechanism works

User Account

All Pages