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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?
does the job of managing a high-technology function e.g. an engineering design department differ from that of managing
A vertical piston-cylinder device contains a gas at a pressure of 100kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston. Determine the local atmospheric pressure an..
a bucket packed with 12 - inch diameter steel balls weighs 50 pound. when packed with 116-inch diameter steel balls the
This crate holding 40 bricks, each of mass 1.3kg, is placed on a hydraulic lifting beam as shown. State the order of the lever used here. Calculate the effort required to lift the load. Calculate the mechanical advantage for this system.
oxygen is flowing through a nominal 2 inch schedule 40 steel pipe pipe at a velocity of 10 fts. the oxygen is at a
The Realtor assumes prices of midrange homes are normally distributed and the variance in prices in the two cities is about the same. What would he obtain for a 90% confidence interval for the difference in mean prices of midrange homes between P..
Air flows at the rate of 1kg/s through a convergent-divergent nozzle. The entrance area is 2x10^-3 m^2 and the inlet temperature and pressure are 438 K and 580 kPa. If the exit pressure is 140 kPa and the expansion is isentropic, find;
determine the specific volume of superheated nitrogen gas at an absolute pressure of 678 kpa and -134degc based on a
consider the equation dydt y2y2-1 a- determine the equilibria and classify each one as asymptotically stable unstable
a rigid well insulated container consists of a two-phase mixture that has .004ft3 of saturated liquid water and 1.45ft3
You are assigned to design a heating system for a swimming pool that is 2 m deep, 20 m long and 20 m wide. The client desires that the heating system be large enough to raise the water temperature from 2 C to 3C in 2 hours. The rate of heat loss from..
The velocity, V, of a spherical particle falling slowly in a very viscous liquid can be expressed as V = f(d, μ, γ, γ2) where d is the particle diameter, μ is the liquid viscosity, and γ and γ2 are the specific weight of the liquid and particle, ..
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