let's talk technical about DC motors and Drives

rfrink

rfrink

Joined
Aug 1, 2000
Messages
863
I can't figure it out.......:(

I'm very well versed and educated in industrial power transmission and industrial controls.

My problem is that I want to run a 1.5 HP DC motor on 110VAC.

I can't find the components.

I can easily find a 1.5hp DC motor....but they all have 180V arms.. I need a 90V arm. motor for 110VAC...but they stop at 1 hp in size. I could use the higher speed 1.5 HP motor with a 180V armature (2500 rpm instead of the 1725 rpm) and run it on 90VDC ...but then I would only get 1/2 the speed...(1250 rpm). In this case, I could set my drive for 110VAC input...which will output 90VDC and run the 1.5hp motor half as fast. Now the question is that the Drives are only rated for 1HP at 90VDC...so they will limit the output current to only 1hp. In this scenerio, I have a 1.5 hp DC motor running 1/2 speed with a max input of 1HP from the drive.....there's no way I can get 1.5hp out...basic physics says the output will not exceed the input. In this case, 1hp in = 1hp out at best.

Is a 1.5HP DC motor and drive really putting out 1.5HP when it runs on 110VAC?

Does anyone understand what I'm talking about? ..or am I goin' crazy..?

Please help me...:confused:

Sincerely, Rob
 
:confused: :confused: Your not crazy Rob. I can recoginize a motor about three out of five times and that's where my expertice ends with electrical stuff. I have a friend that does all my wiring and I try to stay on his good side.
 
I have an electronics background but not in industrial stuff such as large motors, however, I recommend not trying to operate a motor at less voltage than it is designed for. Usually, doing so will cause current overload in both the load (in this case that would be the motor) and its source of current.

Devices called motor speed controls and light dimmers commonly use a component called a Triac to vary the duty cycle of AC but the voltage output remains rather constant. There is less electricity flowing through the load per time interval as the controller is adjusted down.

Roger
 
Rob, check with these people. Minarik is a Leeson distributor, and if anyone would know, they would. They have branches in most major areas, and toll free numbers if not. They are generally good though.
http://www.minarikcorp.com/index.html
PS; maybe you could work a deal with them on a blanket PO, and get the good guy OEM price on the motors and controls. ;)
 
Do you have access in your garage or shop to 208/230 single phase power? Most houses are wired for this for use with the electric clothes dryer. I would think that it would be easier to locate a drive/transformer to accomplish this than trying to find a 1.5hp unit for 110/120vac. I will take a look in some of my industrial suppliers catalogs and see if I can find anything that matches what you're are looking for.(I build and repair production equiment for a medical device manufacturer so I have plenty on hand:) adios and good luck, stevo
 
thanks for the link Mike! I talked with the tech folks at Miniarik today and now I'm a "master" of Dc components:) . They were very helpful and informative.

Steve, Thanks for the effort. I needed the answers so I can better inform customers about DC motors and drives. Some folks only have 110V with no options of anything else.....so the goal is to get as much HP as we can through the 110v outlet.

Take care,
Rob
 
Rob, if it were me and I only had 115 volt available I would check into a Baldor Inverter and a three phase motor. The series 5 micro inverter is good for 5.5 amps continous current,3 phase output;which will cover about all the 1.5 hp and up to some 2 hp 3 phase motors. Call your local baldor dealer, he can fix you up. If you need the part no.'s holler and I'll post them. mike
 
Thanks Mike,

I looked into it and found that they are only available up to 1hp at 110VAC input. The rating also refers to the 3ph output current. There are three legs carring current out. The incoming single phase current is much higher due to the fact the this current is distributed into 3 outgoing legs.

I couldn't find anything that had the 5.5 amps cont output @110VAC input that you refered too. It looks like for that level of performance, the input needs to be 220VAC regardless of the series of drive.

Bummer...thanks anyway.

Take care,
Rob
 
Rob, Kind or related to your post. I just aquired a treadmill motor. Thiinking about trying to power a 2X24 detail grinder (lighter loads). it's 1.5 HP 100 vac. I have no idea what kind of power or rpm's it will generate. I will have to find a variable control for it. Just wondered if you have played with one of these motors before? Thanks. Terry
 
Rob, Part no. ID5602-WO/BO. 5.5 continious amps output @ 230 volts 3 phase, maximum 2 hp. Input 115 volts 1 phase. Part no.CM3550T 1 1/2 hp, 3450 rpm, 5.0 amps @ 230 volts 3 phase. Part no. CEM3587T 2 hp,3450 rpm, 5.4 amps @ 230 volts 3 phase. Talk to a good tech man. This will work. I've been repairing and selling this stuff for almost 30 years. mike
 
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