Electronics > Beginners
Ironless linear motor - how to lower the voltage
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cmcraeslo:
Hello.

I have ironless linear motor (magnets on the side and 3 coils that slide between the magnet tracks) that has 1/m/s at 30V with peak force of 200N. What I want to do is to make the same power and velocity at 12V. Let's assume that I have a driver and a 12V source that is capable of 100A. How would I size the coils? How many turns, what diameter, topology to use? Is there a calculator on the internet that would give me rough numbers to start with?
spec:
+ cmcraeslo

I assume that you are talking about DC and not AC power. Also, can you post the maximum current that the LM consumes.

The force is calculated by I * number of turns, where I is the current flowing through the coils.

Rather than reduce the number of turns and use heaver gauge wire, which would be problematic, why not use a switch mode power supply to convert 12V to 30V.
cmcraeslo:
Yes, I'm talking about DC power.
I don't want to add complexity and cost to the product. I also want the product to be as efficient as possible. I guess by lifting the voltage, I also add a lot of possible points of failure to it. Not to mention boosting the voltage with those amps...

You mentioned this would be problematic? Why's that?
spec:

--- Quote from: cmcraeslo on November 15, 2018, 08:53:45 am ---Yes, I'm talking about DC power.
--- End quote ---
OK, thanks

--- Quote from: cmcraeslo on November 15, 2018, 08:53:45 am ---I don't want to add complexity and cost to the product. I also want the product to be as efficient as possible. I guess by lifting the voltage, I also add a lot of possible points of failure to it. Not to mention boosting the voltage with those amps...
--- End quote ---
Fair points!
Can you give a figure for the amps as requested.

--- Quote from: cmcraeslo on November 15, 2018, 08:53:45 am ---You mentioned this would be problematic? Why's that?

--- End quote ---
I know very little about linear motors on the practical side, but in general winding motors, especially high power types, is a specialist business and is best done by a company with the expertise, especially as the motor seems to be high power
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