speed control needed

Ok i have a 600w Bosch palm router but its fixed speed, I would like to add something to get variable speed from it, have heard in past that light dimmer switch do job but will it cope with 600W. any other ideas to get variable speed welcome. also soft start would be useful.

The low cost dimmers from Hong Kong can hadle 2KW, cost about £1.18, I have a simple modification which adds a little piggy back board to give feedback. It senses the back EMF generated and uses that to compensate for the speed drop under load.

.R5, R6, R7 D1, D2 and C3 are the components that are added to the module. The module connections are changed and what was the input becomes the output and vise versa.

I will be adding a Youtube video of the process later this week.

By the dots it looks like a Vero Board job.

Ian S C

.

Thanks Malcolm

That would be a very useful upgrade !!

MichaelG.

It could just be a schematic capture program......

In my opinion, Vero board would be inappropriate for a Mains Powered project.....especially not knowing the op' capabilities....

Ian,

I'd recommend you look at this as a kit.....

https://www.esr.co.uk/products/frame_motor-control.htm

It takes all the guess work out of designing/building/modifying, especially if you are a beginner...

Just my 2c worth....

Edited By John Rudd on 21/02/2016 09:53:26

Hello Malcolm, what the resistor and capacitor values. I'll look out for your YouTube video. John

Give me chance to do the Youtube video, all will be revealed.

ICircuit was a screen grab, dots are the layout grid.

R5 & R6 100K, R7 15K, C3 10nF to 47nF dependent on motor characteristics. D1 & D2 1N4007. All other components as supplied on the dimmer.

A toner transfer PCB holds the components for the piggy back board with four leads between the boards.

I will post a image here of the PCB layout, see below

The ESR board is no better than the Hong Kong dimmers, as it does not have load compensating feedback.

Your are playing with leathal voltages, so be safe. Best to do test work with one of those Garden mower type ELCB modules that are designed to shut off the power when you mow the power lead.

<Quote> The low cost dimmers from Hong Kong can handle 2KW, cost about £1.18, I have a simple modification which adds a little piggy back board to give feedback. <Quote>

Can you post a link to the 'Hong Kong' Dimmer that you based your design on?

Dave

My Alba 1A shaper when manufactured was fitted with a 950 rpm motor. Sometime in its life someone has fitted a replacement that runs faster - 1500rpm if I remember correctly. This means that the shaper runs a mite to fast even with the two speed gear change set on "slow".

I have been told several times on here in the past that slowing this 230v AC single phase motor was not possible yet John Rudd posts on this thread and links to this:

https://www.esr.co.uk/products/frame_motor-control.htm

Is it possible that the model R-10 will do the trick for me and slow my shaper?

Have I finally discovered the holy grail?

Rik

Edited By Rik Shaw on 21/02/2016 12:49:02

Hi Rik,
This type of controller is only suitable for series (Also called universal.) motors. Your motor is more likely to be an induction motor so what you have been told before still stands.

Les.

John

Forn the module I am using, search for item number 221904245698 on ebay. It says 4KW, but the heat sink is not big enough for that power. The traic is though, so for larger powers you could change the heatsink.

Malcolm

Maybe so, but I made no claim that it was better.....merely pointing out that for a beginner, it may be more suitable to build rather than modifying an existing design....

Why pay over £10 when you can get the same functionality for £1.18

Malcolm

Thanks Les - I never believed in the holy grail anyway

Thanks Malcolm. Controller ordered (in fact ordered 2).

The item I linked to was in response to Ian's request for a method of speed control for his router whch I believed to be of the universal motor powered type....

In no way did I indicate that it may be suitable for Rik's use..

Hi

IF this is a Universal Motor I.E Brushes and Commutator the it will run on a AC to DC speed Controller.

Expensive yes and needs to setup to match the motor.

Eric

John - Not to worry, if confusion has arisen it is due to my lack of knowledge in matters electrical - not your fault at all. Your ongoing advice on here re: electricals is much appreciated by me and others I am sure.

Rik

Hi Malcolm,

Has there been any progress with the video. I keep watching your youtube channel but nothing seems to have been added.

Mike