Number of Turns vs. Wire Gauge (BLDC Motor)

2
1
Summary
For the same mass of copper wire, would more turns or greater thickness create a stronger magnetic field from a coil?
Summary: For the same mass of copper wire, would more turns or greater thickness create a stronger magnetic field from a coil?

So I am attempting to make a brush less DC motor, and I am wondering whether the coils would create a greater magnetic force if there are more turns or if the wire is thicker. If the copper wire is thicker, there will have to be fewer turns. If the copper wire is thinner, there will be more turns. I do believe that wire of a greater thickness has less resistance. Imagine I have two coils of copper wire with the same mass of identical copper wire; one of greater thickness but fewer turns, and the other of less thickness but more turns. My question is: which would create the strongest magnetic force? (Extended distance/ range of magnetic field is not necessary, because the rotor will be extremely close to the coils anyway). Please pardon my lack of technical terminology.
 

phinds

Science Advisor
Insights Author
Gold Member
15,380
5,020
the magnetic field has nothing to do with the size of the wire but everything to do with the number of turns. More turns, greater field intensity.
 

anorlunda

Mentor
Insights Author
Gold Member
7,500
4,236
Thicker wire permits higher currents. So for the same current thinner wire and more turns allows a more powerful field.

The limit is thermal; how much heat can you dissipate from the coils at a reasonable temperature. The thermal load is produced by ##I^2R## losses. Thinner wires have higher R per foot and more feet if you increase the number of turns.

A BLDC motor is designed to mate with a BLDC controller. You have to consider how much current the controller can provide.

As in most designs, everything interacts with everything else and there are many tradeoffs.

Reading this may help you;
https://www.edn.com/design/sensors/4406682/Brushless-DC-Motors---Part-I--Construction-and-Operating-Principles
 
2
1
Thank you both ever so much. I am going to use thinner wire because, I have a design that should keep temperatures low as is.
 

Want to reply to this thread?

"Number of Turns vs. Wire Gauge (BLDC Motor)" You must log in or register to reply here.

Related Threads for: Number of Turns vs. Wire Gauge (BLDC Motor)

Replies
9
Views
835
Replies
3
Views
487
  • Posted
Replies
5
Views
658
Replies
31
Views
1K
Replies
6
Views
611
Replies
25
Views
1K
Replies
7
Views
834

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top