Re: Variable speed motors
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Extra pins are probably for positioning feedback.? The incline motors out of treadmills are the same. ? Tony ? ?
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From: [email protected] <[email protected]> On Behalf Of Chris Albertson
Sent: Saturday, 10 February 2024 11:31 AM
To: [email protected]
Subject: Re: [7x12MiniLathe] Variable speed motors? These right-angle motors with lead screws are used to adjust the seats in cars. ?That there are so many of these being sold on the surplus market means ?to me that they must have been replaced by something better. ? I wonder if they are not all brushless motors now Yearago, brushless motor were impractical because MOSFET switches had high on-resistance. ?But now with good and way-cheap mosfets and 50-cent microcontrollers, the brushless types might be cheaper to make, and you necver have to replace the brushes. OK, I just looked. , Newer motors are advertised as having four of five pins this would indicate they are not simple DC brushed motors. ? Likely three phases. ?
? Speaking of that motor from the HSM article - I got an email from? and they are selling that same motor for $10.95 with $6.95 flat rate shipping and they made a brass flange nut for the shaft that is included as well. Here is the link: ? ?The Jan/Feb 2024 Home Shop Machinist has a cover article about making a power X axis drive for a mini-mill table that uses a 12V car seat motor (American Science and Surplus has been selling them forever; there must be warehouses full of these things??) You could probably modify that little gear motor for that purpose.? ?
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Buffalo John
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