Motor protection

I have a Clarke 6" band sawthat I use for cutting metal

Last night the blade James and burned the motor out

So I need a new motor however I would like to prevent this happening g again.

Any suggestion what I could do?

And before you say it, yes don't leave it running on its own

You need a Direct Online Starter, rated to suit the full load amps as stated on the data plate ! Good ones are not cheap. On getting one it has to be set to the current rating for the motor. Fla = 2.8A You need a 2-4A unit set to 2.8A. A fuse WILL NOT help in this application. If buying secondhand check that the coil voltage is 240V not 415V. Good Luck Noel.

I have just had a quote for a replacement motor from Clarke £200!!!!

This seems rediculously high

Motors do broadly follow various standards, the motor plate will often have the frame size as one of the parameters and this will define the mountings and shaft size and height. TEC have built a reputation for decent quality and a reasonable price, WEG are also a contender for an attractive price and quality. Google will find suppliers of both.

Mike

Machine Mart sell Clarke motors - which one do you need?

https://www.machinemart.co.uk/categories/?search=motor

Not much info on the motor plate

The summary for the 3/4HP (550W) 2 pole from MM says frame size 71 and 14mm shaft.

Spec sheet here to check against yours:
https://www.machinemart.co.uk/AspSiteAssets/download_files/ClarkeElectricMotors.pdf

Here endeth my knowledge on the subject!

Cheers

However the shaft dia is 16mm

A 16mm shaft is a bit of an odd size, shafts are often 11mm,14mm then 19mm, double check that the shaft is not 5/8” which is 15.875mm. As the frame size is not on the plate then it would be useful to measure the bolt centres for the feet and the height of the shaft Centre from the foot mounting surface. There are plenty of drawings of motor dimensions to be found online and you may be looking at a motor around £100

Mike

Before you get to shaft size check the motor speed 1450 rpm or 2850 ! The first is a 4 pole motor the second is a 2 pole ! I could not read the RPM on the data plate, nor the current. Why not look for a second hand unit ? an adaptor could easily be made if the mountings are different. If you buy a new motor the guarentee will be void if you do not use a DOL starter or some form of over current protection. Be warrned ! Noel.

Motor speed is 1450 shaft size 15.9mm

I have an "Alpine" saw to which I fitted with a DOL starter maybe 30/35 years ago and it appears to be a similar machine under a different name. I have just checked my saw and the motor is 4 pole capacitor start 1425 rpm half HP.. So, I think almost any !/2 HP cap start motor can be fitted, maybe a bit of work is required with mounting bolt holes and shaft diameter. I would look out for a second hand motor for £20 or £30 and fit a DOL. Before buying second hand, run the motor and check the direction of rotation, most are easily altered but some not. John

I would go for at least a 1hp motor , better that the belt slips than risk another burn out.

The motor is 1hp

The motor in the photo is labelled as 500 watts, that equates to .75 hp not 1 hp. Dave W

Confusion between Ph 1 and Hp ? Noel.

What equation did you use?

HP = KW x 1.341 so a 500w motor is equivalent to about 0.67hp

I think the confusion is its says pH 1. which is phase not hp. my pal has the same saw and his is 350w

I expect this is likely an imperial motor. Actually 15.87mm? 5/8”?

How mm might spec their motors is debatable  and possibly misleading. That 500W may be gross consumption, not real horse power delivered. That may make it only 1/2HP (or even less!).

Ignore the temptation to fit a more powerful motor.  That is not a sensible option.  Something else would break or the motor would still burn out if/when a jam occurs.  Running improperly tensioned belts is just plain ridiculous.

Fitting an overload cut-out is the way to go.  A fuse that would blow with a stall would likely blow when starting the motor.

Follow the sensible suggestions, particularly that of the proper electricians.

The post by Noel was all that you required.  Follow that advice.

Edited By not done it yet on 03/02/2022 11:53:00