Previous in Forum: Best Varnish for Hub Motor Stator Coils   Next in Forum: Trigeneration Sizing?
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
11 comments
Rating: Comments: Nested
thabo_ken
Participant

Join Date: Jan 2014
Posts: 3

Mechanical Design

01/13/2014 4:34 AM

hey guys help me with on this assignment

through calculations, select a motor and a battery that can be used to drive a load of 300kg at a maximum speed of 80km/h on a frictionless flat road. select a battery that can last 2hrs wen the load is running at maximum speed.(you may make reference to any metric design tables and formulae) show all the necessary working
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: mechanical design

01/13/2014 4:58 AM

Do we get to ignore air drag also?

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
thabo_ken
Participant

Join Date: Jan 2014
Posts: 3
#2
In reply to #1

Re: mechanical design

01/13/2014 5:06 AM

i suppose so,
Register to Reply
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#3
In reply to #2

Re: mechanical design

01/13/2014 5:18 AM

Then you don't need a motor or battery at all.

Refer to Newton's first law.

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
Fredski
Guru

Join Date: Feb 2011
Posts: 7025
Good Answers: 207
#11
In reply to #1

Re: mechanical design

01/13/2014 11:14 AM

just pretend its a Mag-Lev track and the wind is at your back
Register to Reply
thabo_ken
Participant

Join Date: Jan 2014
Posts: 3
#4

Re: mechanical design

01/13/2014 5:31 AM

initialy the load is at rest,
Register to Reply
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#6
In reply to #4

Re: mechanical design

01/13/2014 6:51 AM

Then you only need to get a battery which can supply enough energy (½mv²) to get it up to speed. Decide on the motor and gearbox dependent on the spec of the battery; unless you have any other constraints involving how quickly you need it to get up to speed.

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply
user-deleted-1105
Guru
Popular Science - Weaponology - New Member United Kingdom - Member - New Member

Join Date: May 2007
Location: Harlow England
Posts: 16512
Good Answers: 670
#5

Re: mechanical design

01/13/2014 6:05 AM

If you show us how you are are doing it the maybe you will get some help and pointers.
I daresay no one is just going to do it for you.
The help you get out out is proportional to the work you put in.
That's Dels first law of CR4 posting.
Del

__________________
 health warning: These posts may contain traces of nut.
Register to Reply Off Topic (Score 3)
phoenix911
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 23647
Good Answers: 420
#7
In reply to #5

Re: mechanical design

01/13/2014 7:45 AM

Dels first law of CR4 Posting.......

I think he was sick that day when it was covered in class.

__________________
 “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
Register to Reply Off Topic (Score 5)
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#8

Re: mechanical design

01/13/2014 8:27 AM

Del is right.

From: CR4 FAQ #14:

  • Do your own homework. CR4 is not a homework cheat site. While some here might relish the opportunity to sharpen up old rusty skills by working the homework problem, consider the following and consider it well. If you cheat on your homework by using someone else's answers, you are only cheating yourself, because the purpose of any homework or other academic assignments is to help you learn - by practice, repetition, and self-discovery.

@Fredski,I think he's serious.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
Fredski
Guru

Join Date: Feb 2011
Posts: 7025
Good Answers: 207
#9

Re: mechanical design

01/13/2014 8:33 AM

you're joking, right?
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#10

Re: Mechanical Design

01/13/2014 10:45 AM

This cannot be done from the information provided. Electric motors require friction to move something on a road. Traction is friction.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
Register to Reply
Have a Different Question?
11 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Fredski (2); lyn (1); phoenix911 (1); Randall (2); redfred (1); thabo_ken (2); Tornado (1); user-deleted-1105 (1)

Previous in Forum: Best Varnish for Hub Motor Stator Coils   Next in Forum: Trigeneration Sizing?

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (98 right now)
Show Members
Advertisement