A lectern (or podium) in an auditorium is designed to adjust its height automati

Question

A lectern (or podium) in an auditorium is designed to adjust its height automatically, depending on the height of the speaker. An ultrasonic gage measures the height of the speaker and sends a command to the logic hardware controller of a stepper motor, which adjusts the lectern vertically through a rack-and-pinion drive. The dead load of the moving parts is supported by a bellow device. A schematic diagram of this arrangement is shown in Figure P7.14. The following design requirements have been specifi ed:
Time to adjust a maximum stroke of 1 m = 5 s Mass of the lectern = 50 kg Maximum resistance to vertical motion = 5 kg Displacement resolution = 0.5 cm/step
Select a suitable stepper motor system for this application. You may use the ratings of the four commercial stepper motors as given in Table 7.1 and Figure 7.14.

Explanation / Answer

NEMA motor of 101SM is best suited for this

because it has a flexible torque . the remaining SM are used for industrial purposes.and precise open loop posiyional control.

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