Swapping out the 3 phase motor

[fireguy976]

I did a search, and could find much on this, so if there are links out there, or advice thanks in advance.

The origional motor is 575V 3 phase, and because of cost, will be swapping it out.

The easiest is changing to a 220V 1 phase 2 hp motor currently on sale.

The other option is to swap in a Leeson DC 3/4 hp motor in order to have infinite speed control, but I know sweet nadda about Dc motor controller or drives. The motor is a 90 volt unit

Would it also be possible to have an RPM display built in as well?

Thanks,
Ken J

[HimyKabibble]

Originally Posted by fireguy976 I did a search, and could find much on this, so if there are links out there, or advice thanks in advance. The origional motor is 575V 3 phase, and because of cost, will be swapping it out. The easiest is changing to a 220V 1 phase 2 hp motor currently on sale. The other option is to swap in a Leeson DC 3/4 hp motor in order to have infinite speed control, but I know sweet nadda about Dc motor controller or drives. The motor is a 90 volt unit Would it also be possible to have an RPM display built in as well? Thanks, Ken J

Ken,

Keep the 3-phase motor, and buy a VFD - It'll let you run your 3-phase motor from a single-phase line, and give you variable speed - with display. For a 2HP motor, it'll cost you well under $200. (Look at the TECO FM50s at factorymation.com).

Regards,
Ray L.

[Al_The_Man]

Keeping the motor is probably not an option if it is 575v.
You will need both motor and VFD if going that route.
The 1 phase motor will not give you electronic variable speed.
The leeson maybe well underpowered if it is only 3/4hp.
Al.

[fireguy976]

The problem is the 575 voltage the origional motor requires, I need a transformer to step the voltage up from household 220. And the origional motor is 3/4 horse.

Quotes are around 600 to 900 bucks for both a transfomer and a phase converter. Im not spending that.

Even if I want to keep 3 phase, I have to get a different 3 phase motor.

The DC motor was 80 bucks, I either use it here or somewhere else. The price of a motor drive should be less than the VFD. Basic internet search looks like about 100 to 150 for a drive board. With the DC you get all the power with the speed control.

So my options are,

1) use the DC motor which I have from a trade, but need motor controller, which I know squat about.....

2) buy a 220V face mount motor currently on sale, and its 2 hp so lots of power, and I still have all the pulleys for the different speeds, as was the origional setup,,, bolt it up and go, but no reverse switching,,

3) find another 3 phase that fits, must be the right voltage,,, and then get a VFD

KJ

[fireguy976]

you must have been reading my mind Al,,,

question tho.......

if the origional 3P motor was 3/4 horse,,, should a DC 3/4 not provide the same power (torque)??

if its underpowered, the 1P 220V 2 horse motor should have gobs to spare, and there are still the pulleys which were needed to use with the origional motor.

KJ

[Al_The_Man]

I see you have a duplicate thread going, now you mention the original was only 3/4hp you could use the DC motor, you need to get a KB or Baldor DC drive.
These can be had on ebay.
Or from you local KB/Baldor rep.
These do not normally come with speed indication as does a VFD, although a VFD only indicates the speed (frequency) it is outputting, unless it has the encoder option, it is not exact rpm.
Al.

[HimyKabibble]

Originally Posted by fireguy976 The problem is the 575 voltage the origional motor requires, I need a transformer to step the voltage up from household 220. And the origional motor is 3/4 horse. Quotes are around 600 to 900 bucks for both a transfomer and a phase converter. Im not spending that. Even if I want to keep 3 phase, I have to get a different 3 phase motor. The DC motor was 80 bucks, I either use it here or somewhere else. The price of a motor drive should be less than the VFD. Basic internet search looks like about 100 to 150 for a drive board. With the DC you get all the power with the speed control. So my options are, 1) use the DC motor which I have from a trade, but need motor controller, which I know squat about..... 2) buy a 220V face mount motor currently on sale, and its 2 hp so lots of power, and I still have all the pulleys for the different speeds, as was the origional setup,,, bolt it up and go, but no reverse switching,, 3) find another 3 phase that fits, must be the right voltage,,, and then get a VFD KJ

Oops! I missed the goofy voltage. Go to www.surpluscenter.com. They usually have several DC motor controllers for under $100, suitable for at least 1HP. These are very popular:

http://www.surpluscenter.com/item.as...tname=electric - you'll want the heat sink for it as well.

http://www.surpluscenter.com/item.as...tname=electric

They also have a number of 3-phase motors for cheap.

Regards,
Ray L.

[fireguy976]

Thanks Al and Ray,,,

Cheers,
KJ