932Views11Replies

Author Options:

how to select motor for any project? Answered

what is the formula to choose a motor to lift load? what parameter should have to consider while selecting a motor?
 how much power it consume? which is the best motor for project(say to drive a vehicle/car) brushless dc motor or any other?

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
Elsinicegirl
Elsinicegirl

1 year ago

Which motor is preferable for 513 newton machine rotated with 600 rpm powered by solar energy

0
iceng
iceng

Reply 1 year ago

What is a 513 Newton machine that you speak of
Is it a frame size ?
Is it weight in Newtons ?
Is it a power value ?
Is it a current value ?
Is it a page number ?
What is it (be specific) ?

0
iceng
iceng

7 years ago

A single horse power muscle machine.

FMT34D9GPZ9R7XQ.MEDIUM.jpg
0
rickharris
rickharris

Answer 7 years ago

It's OK but the exhaust emmissions!!!!

0
iceng
iceng

Answer 7 years ago

LOL

Very true .... but it mostly gets walked off ;-D

0
rickharris
rickharris

7 years ago

All answers totally true, You can also get a long way by looking at similar projects and learning from them. If I tell you I built an electric car with a motor drawing 20 amps at 24 volts and that car could get to 30 MPH on a flat road then you have a pretty good marker that 500 watts will get you 30 MPH if you car performes as well as mine.

0
iceng
iceng

7 years ago


  1. First you need need to select the motor with the most desirable speed / torque curve.
  2. Then consider weight and driving electronics.
  3. Efficiency will be a major impact if this is a serious consideration.
  4. One way to reduce motor weight is to run it at higher speed and gear down.
  5. As the motor size goes down the output energy remains the same with less surface to cool the machine leading to novel cooling techniques.
  6. PM motors are the popular machines for vehicles these days.
  7. BUT the Tesla eCar company is using a small high speed induction motor because over the speed range 0.01 to 200 mph that machine is more efficient.
  8. You do have to balance the weight saved by a smaller motor against the added weight of the gear box.
  9. Regeneration.... All motors can do this PM, Induction, Series, Stepper, Torque.
  10. The electronic systems are designed to make breaking between disc and regeneration a seamless deceleration.
0
steveastrouk
steveastrouk

Answer 7 years ago

Surely you have to know the load, before you can select the motor !

0
iceng
iceng

Answer 7 years ago

OF Course... that is how one comes up with a Speed / Torque to match.

Knowing the Load is the Zero "you understood" step !

Given today's induction motors one can reasonably design a speed torque curve by changing deep bar rotor dimensions.

0
Josehf Murchison
Josehf Murchison

7 years ago

You choose a motor for a job by horsepower, environment, and cost.

Horsepower

Feet pound seconds

How many feet, times how many pounds, times how many seconds equals foot pound seconds.

550 foot pound seconds ft*lb*s = 1 horse power

1 horse power = 746 watts

Watts = amps times volts = P = A*V

Then power supply AC or DC, size, and cost.

Lets face it weight size and added circuitry effects efficacy.

Take the AC DC motor in a power tool it is 1/4 the size and weight of an induction motor the same power, easier to pick up.

So why have Induction motors, they were first called explosion proof motors, without brushes there is no ark to touch off leaking gas. Also brushless motors need fewer repairs making them cheaper to maintain.

Cost is a factor why pay $100 for a motor when a $20 motor will do the same job.

0
Josehf Murchison
Josehf Murchison

Answer 7 years ago

Sorry I did horsepower wrong.

feet times pounds divided by seconds

ft*lb/s

0
steveastrouk
steveastrouk

7 years ago

start by defining the load, what inertia does it possess ? How fast do you want to accelerate it