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Repeat Problem 7, except choose the current command so as to minimize the commanded current.
Problem 7
A four-pole permanent-magnet ac motor drive has the following parameters:
The machine is to deliver 10 Nm at a mechanical rotor speed of 200 rad/s. Compute the q- and d- axis current commands such that the power factor is maximized. What is the rms voltage and current applied to the machine, and what is the efficiency?
a new cylindrical tank is being designed for seaworld where the 3m high plexiglass wall will be supported using i-beams
compute the wet bulb temperature of moist air that has been cooled and dehumified from 25 c and 80 percent relative
a finned-tube heat exchanger has to be designed to transfer heat from the humidified hotair to cold water. it is
a projectile is launched straight upward at 73.5 ms from a height of 93.0 m at the edge of a sheer cliff. the
A piston contains 0.5kg of water. The initial volume of the piston is 0.125 m3 and the pressure inside the piston is 300kPa. The water is expanded to a volume of .31701 m3. The pressure inside the piston remains constant. Determine the amount of heat..
The ball is kicked from point A with the initial velocity vA=10m/s. Determine the range R, and the speed when the ball strikes the ground
At what value of the strain should the operators take action to reduce the pressure in the tank? (Data for the steel are as follows: modulus of elasticity E = 205 GPa and Poisson's ratio 0.30.)
The shaft is hollow of external diameter 75 mm and in4ternal diameter 40 mm. The density of the shaft material is 7700 kg/m3 and its modul us of elasticity is 200GN/m2. Find the lowest whirling speed of the shaft, taking into account the mass of t..
the heat supplied by a heat pump used to maintain a buildings temperature is often supplemented by another source of
a refrigerator cycle has a cop of 3 and removes 100kw of heat from a building which is kept at 23c. the device rejects
Liquid water at 26.67°C flows in a straight horizontal pipe in which there is no exchange of either heat or work with the surroundings. Its velocity is 40 ft/seg in a pipe with an internal diameter of 2.54 cm until it flows into a section where the p..
a closed-cycle gas turbine power plant use air as the working fluid . air is compressed in a compressor heated in an
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