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MG Midget and Sprite Technical - heater motor turning

I picked up a heater motor from a unknown British car and yes it fitted my frogeye! The only trouble is that it turns around the wrong direction… How can I solve that, changing the polarity did not change the direction. Do other fans that fit in the Bakelite housing exist?

Flip
Flip Brühl 948 frog 59

may be yes, may be no

see - http://www.youtube.com/watch?v=2gCN3hbtVgQ&feature=plcp&context=C418b3d5VDvjVQa1PpcFO-ZpLC-nqLvtfeAVl3r69UH7zDfcRxads%3D
Nigel Atkins

Thank you Nigel,
Oh how I like prof. dr. John! I see that my and his motor turns clockwise so that is allright. What I did not understand is the direction of the vanes on the fan. Are the placed in an aerodynamic right position? It occurs top me that they should be in the oposite way. Are there other fans? or am I mistaken?

Flip
Flip Brühl 948 frog 59

Flip,

In a centrifugal fan the vanes can be arranged either way for the same rotation direction, it alters the characteristics of the fan so will have been selected by the designer for the desired operation. I know that is the case but don't know what difference it makes but I suspect google may find the information. Regarding reversing the rotation, if that is required, you would have to disassemble the motor and reverse either the field or armature connections to reverse their magnetic field and hope the brushes are designed to run either way.
David Billington

Some fan motors are such that you reverse the rotation by removing the through bolts and turning the brush end housing 180 degrees. The brushes are slightly off from 180 from each other, and the relationship of this offset to the field coils is what determines rotation. Took me a while to figure that out when I took one apart to lube it and it turned backwards after reassembly!

FRM
FR Millmore

thank you,

http://www.bpnorthwest.com/.sc/ms/dd/ee/11323/Heater%20Fan%20Motor%20and%20Fan%20High%20Output

There it is. I decided not to buy it. Too expensive ant the old thing is not optimal but good enough

Flip

Flip Brühl 948 frog 59

This thread was discussed between 17/04/2012 and 20/04/2012

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