Reverse Sewing Machine Motor?

Neil:

Re your OP, I didn't know that GHT himself had used a sewing machine motor for his mini drill, although I believe other builders may have done so (the sewing machine motor I bought for my own UPT is still on the shelf and, probably the wrong rotation!).

Can you point to a description of the GHT version? I should like to know whether this was implemented as an integrated unit or did the motor just sit on the base board? The advantage of the latter seems to be that the direction of rotation could be altered without getting into the motor eg by crossing the belt.

Buffer:

May we have a photo of your finished job in due course, please?

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I may be able to confirm/refute that later today [need to locate the book] ... but it’s worth mentioning that the part number (YM260A-9) is very widely used in Sewing Machines [so Ricca might be something of a Red Herring]

MichaelG.

I did say Series wound. Eventually, I saved up enough to buy a S E L reversing switch. This had four connections, but was not what seemed obvious to two inputs at one end and output at the other.

After 70+ years I cannot recall the wiring for it, but one of the connections was made from the top LH terminal to the motor.

The motors for model railway locos are permanent magnet, so exchanging the DC feed does reverse them.

Howard

It doesn't matter whether it's series or shunt wound, you still have to reverse the field in either the stator windings or the rotor relative to the other to get the reverse rotation. In the last month I've been through this exercise with a series wound dc motor (ex car fan blower) to enable reversing by just swapping the input leads. That required a full wave bridge between the rotor and stator windings to get the necessary field inversion in the stator. I believe that Taycol motors (amongst others) used a wound field and had a 2 pole reversing switch that did the necessary reconnection of either the rotor or stator winding as required.

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As I seemed to recall ... GHT used a Parvalux motor, and the cover of the book clearly illustrates the belt run.

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QED

MichaelG.

Michael Gilligan:

It's good to see the great man at work.

I suppose Parvalux motors may well have been used on some sewing machines but my impression is that it is the small domestic sewing machine motors that the OP asked about.

PS The Parvalux I have on my Quorn is readily reversible.

Edited By ega on 05/12/2020 17:26:19

Perhaps this photo and text from the book is more relevant:

Rod

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Be that as it may ... I don’t recall there being ANY reference to the use of Sewing Machine motors in the book.

I will check on that forthwith !!

The OP being our esteemed Editor, who was trying to assist with a telephone enquiry ... I suspect he was acting upon information [good or bad] received.

MichaelG.

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Edit: I have just read Rod’s post ... That saves me the bother of checking.

Another Edit: Presumably Rod and I have different editions of the book, as in mine the friend’s motor details are referenced at Appendix A 33 ... with the referencing text being on p128 and sans illustration.

Sewing machine motor and controller: Make, Y. K. D. Model No. YM 260A-9. 240v. 90 watts. .45 amps. 6000 rpm

Edited By Michael Gilligan on 05/12/2020 18:20:01

Edited By Michael Gilligan on 05/12/2020 18:30:16

Edited By Michael Gilligan on 05/12/2020 18:52:58

Rather than making yet another edit:

For info. This appears to be the ‘genuine’ YDK motor [albeit made in Taiwan, not Japan], Advertised by an English supplier. **LINK**

https://www.bsk.co.uk/ydk-sewing-machine-motorfoot-control-2456-p.asp

[quote]

FITS Brother - Elna - Janome - New Home - Singer - Toyota - Riccar etc

[/quote]

MichaelG.

Michael It does say in the book about using sewing machine motors.

Ega here you go

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Yes ... I have already recognised that; and the fact that there is more than one edition of the book; and that the motor is still available; etc.

I must emphasise though, that the opening post is wrong, on several counts, when it states: “The issue is that the Ricca motor (YM260A-9) originally used by GHT for his pillar tool is no longer available”

MichaelG.

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Edit: just for completeness: http://www.ydk.jp/motor/global/

Edited By Michael Gilligan on 05/12/2020 19:17:09

If you put it underneath you need this one

**LINK**

Buffer:

Thanks for the very clear photos; I think GHT would have approved!

With this approach, direction of rotation seems to depend upon which way up the motor is fixed. Another development would be that suggested by Hopper above.

Series wound motors have very poor speed/torque curves. Shunt wound and permanent magnet are a lot better, induction motors better still. With modern feedback controllers shunt/permanent can be made very good, and variable speed, but you lose power as you slow it down.