linear brushless motor

[Jamie M]

Hi,

I want to make a small linear brushless motor with only two pieces
(magnets and winding), instead of using three layers with the copper
winding in between, I'd like to just have one magnet layer and then the
stator attached to back iron on the other layer. I guess this will
produce eddy currents as the back iron moves across the magnets and may
only allow for slow linear motion. Are there any other ways to make a
linear brushless motor with two pieces like this? I guess one option is
to not use back iron, but then there will be lower field strength in the
motor.

Here is a picture of a "two piece" (magnets, winding) linear motor:
http://pmmotor.com/Images/LinearMotorsFlatSlotless.jpg
Is that back iron on the top of the winding?

"three piece" (magnet, winding, magnet) linear motor:
http://magneticdamping.com/Images/LinearMotorsBalancedDoubleMTSlotted.jpg

cheers,
Jamie

 

[[email protected]]

Hi,

I want to make a small linear brushless motor with only two pieces
(magnets and winding), instead of using three layers with the copper
winding in between, I'd like to just have one magnet layer and then the
stator attached to back iron on the other layer.  I guess this will
produce eddy currents as the back iron moves across the magnets and may
only allow for slow linear motion.  Are there any other ways to make a
linear brushless motor with two pieces like this?  I guess one option is
to not use back iron, but then there will be lower field strength in the
motor.

Here is a picture of a "two piece" (magnets, winding) linear motor:http://pmmotor.com/Images/LinearMotorsFlatSlotless.jpg
Is that back iron on the top of the winding?

"three piece" (magnet, winding, magnet) linear motor:http://magneticdamping.com/Images/LinearMotorsBalancedDoubleMTSlotted...

cheers,
Jamie

http://www.freepatentsonline.com/6828699.html



-Lasse

 

[josephkk]

Hi,

I want to make a small linear brushless motor with only two pieces
(magnets and winding), instead of using three layers with the copper
winding in between, I'd like to just have one magnet layer and then the
stator attached to back iron on the other layer. I guess this will
produce eddy currents as the back iron moves across the magnets and may
only allow for slow linear motion. Are there any other ways to make a
linear brushless motor with two pieces like this? I guess one option is
to not use back iron, but then there will be lower field strength in the
motor.

Here is a picture of a "two piece" (magnets, winding) linear motor:
http://pmmotor.com/Images/LinearMotorsFlatSlotless.jpg
Is that back iron on the top of the winding?

"three piece" (magnet, winding, magnet) linear motor:
http://magneticdamping.com/Images/LinearMotorsBalancedDoubleMTSlotted.jpg

cheers,
Jamie

Check the literature on "Mag-Lev trains".

?-)

 

[Greegor]

josephkk > Check the literature on "Mag-Lev trains".

And rail guns?