Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 29, Problem 8RQ
What two factors determine synchronous speed?
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The piston rod of a double-acting cylinder is to advance when a 3/2- way push button valve is actuated manually. The cylinder is to remain advanced until a second valve is actuated. The signal of the second valve can only take effect after the first valve has been released. The cylinder is to then return to the initial position. The cylinder is to remain in the initial position until a new start signal is given. The speed of the cylinder is to be adjustable in both directions.Draw the circuit diagram for the problem.
Assume that you are to design a 3V V-belt drive. Given that input speed as 1750 rpm and nominal output speed as 725 rpm. Starting with belt linear velocity 4000 ft/min, specify the output sheeve D2 once you specify D1 from last question.
D2 = ___ in.
Provide write down steps including equations.
*** 21.07 and 21.1 were marked incorrect
Based on the timing diagram below, choose the correct statement regarding Timer Relay.
On
Coil
Power
ff
+ 5 →
Seconds
Closed
Contact
Status
Open
Time
Select one or more:
O a. This is the OFF-Delay Relay
O b. This is the ON-Delay Relay
O c. The relay can used in automatic gate at car parking application :- when sensor detect car already pass
by to parking area, motor to control gate closing will turn ON after a few minutes.
O d. When the coil energized, the relay contact will make connection at the same timing.
Chapter 29 Solutions
Understanding Motor Controls
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- What is synchronous speed?arrow_forward7.How many fully rotating revolutes in a crank rocker mechanism? Аз В 1 C 4 D 2arrow_forwardAssume that you are to design a 3V V-belt drive. Given that input speed as 1750 rpm and nominal output speed as 725 rpm. Starting with belt linear velocity 4000 ft/min, specify the output sheeve D2 once you specify D1 from last question. D2 = ___ in. Provide write down steps including equations.arrow_forward
- vibrationarrow_forwardAnalyze the diagram above. Some of the drives system of the figure above has its own depreciation on its efficiencies as the lifecycle progress. State one of the reasons of why the efficiency drop on and explain any method that can increase this efficiency especially on the directional control valvearrow_forwardWhat exactly does the inability to resolve the stopping problem mean?arrow_forward
- Which linear actuator would work best for the following specifications? 1. distance of travel = 30mm 2. time to travel < 0.3 sec 3. number of positions: 2 (one at x-0; and one at x-30mm) 4. tolerance: +/- 2mm 5. load: +/- 0.4 Newtons O linear motor O lead screw O solenoid O hydraulic cylinder O pnuematic cylinderarrow_forwardName two methods used by electronic timers to obtain their time base.arrow_forwardWhat is the mechanism's Degree of Freedomarrow_forward
- Assume that you are to design a 3V V-belt drive. Given that input speed as 1750 rpm and nominal output speed as 725 rpm. Starting with belt linear velocity 4000 ft/min, specify the input sheeve D1 from the list above. D1 = ___ in. Provide write down steps including equations. *** 8.73 and 8.9 were marked incorrectarrow_forwardWhat is forced frequency?arrow_forwardplease answer and explain be specific and i will upvote if correct and explainedarrow_forward
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