Engineering, 18.11.2019 23:31 papabosue
Problem 7: a 3-phase stepping motor is to be used to drive a linear axis for a robot. the motor output shaft will be connected to a screw thread with a screw pitch of 1 mm. we want to be able to have a spatial control of at least 0.05 mm. a) how many poles should the motor have? (5 points) b) how many pulses are needed from the controller every second to move the linear axis at a rate of 90 mm/sec? (5 points)
Answers: 2
Engineering, 04.07.2019 18:10
An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet
Answers: 3
Engineering, 04.07.2019 18:10
Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86
Answers: 2
Engineering, 04.07.2019 18:10
Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.
Answers: 3
Engineering, 04.07.2019 18:10
The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length
Answers: 2
Problem 7: a 3-phase stepping motor is to be used to drive a linear axis for a robot. the motor out...
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