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Some industrial applications of stepper motors call for very high stepping rates under variable load (variable motor torque) conditions. Since the motor torque depends directly on the current in the phase windings (typically 5 A per phase), one method of obtaining a variable-torque drive is to use an adjustable resistor in the drive circuit. An alternative method is to use a chopper drive. Switching transistors, diodes, or thyristors are used in a chopper circuit to periodically bypass (chop) the current through a phase winding. The chopped current passes through a free-wheeling diode back to the power supply. The chopping interval and chopping frequency are adjustable. Discuss the advantages of chopper drives compared with the resistance drive method.
explain the differences between the otto diesel and stirling reciprocating cycles . discuss the application and energy
water vapor is cooled in a closed rigid tank from 520c and 100 bar to a final temperature of 270c. determine the final
consider a well-insulated horizontal rigid cylinder that is divided into two compartments by a piston that is free to
an electric circuit consists of a 12-v storage battery a 10 ohm resistor and an electric motor connected in parallel.
The 16-ft-long cord is attached to the pin at C and passes over the two pulleys at A and D. The pulley at A is attached to the smooth collar that travels along the vertical rod. When sB = 6 ft, the end of the cord at B is pulled downward with a velo..
Using the standard Fe-C phase diagram, draw a vertical line for each of the following steel alloys corresponding to their carbon content: AISI 1018, AISI 1045, AISI 1095, AISI 4140. Draw a point on the line for each alloy at 800oC and 425oC and descr..
A paper mill processes rolls of paper having a density of 984 kg/m3. The paper roll is 1.50 m outside diameter (OD) x 22 cm inside diameter (ID) x 3.23-m long and is on a simply supported, hollow, steel shaft. Find the shaft ID needed to obtain a max..
A paddleboard is 12 ft long, 18 inches wide, 4.0 inches thick, and weighs 15 pounds. If the surfer weighs 170 pounds, how deep, in inches, does the board sit in fresh water?
air is contained in a variable-load cylinder-piston device equipped with a paddle wheel. initially the air is at 500
if a football is kicked at a 45 degree angle determine its minimum initial speed va so that it passes over the goal
air enters a 0.8 cm i.d tube at 20 degree c with an average velocity of 0.8 ms. the tube wall is kept at 40 degree c.
Consider a car having a frontal are of 2.0m^2 with a drag coefficient of 0.35. The mass of the car is 1250kg and the rolling resistance is 1.0% of the weight of the car. At what speed does the aerodynamic drag first exceed the rolling resistance.
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