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Motors Q&A

Motors
(135 Questions : 166 Answers)

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The transformer doesn't change the AC cycles.
Field of Industry:: manufacturing
Product used for:: motorized table
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2 years, 4 months ago
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Answer: 
If you connect the motor that way, you will have the correct voltage at the motor but the motor will still see the 60HZ. There are several more details that need to be discussed. It would be best to contact our Grainger Technical Support Team. With a little more info, we can advise you if that will be an effective arrangement.

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2 years, 3 months ago
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Answer: 
All any motor cares about is a volt per hertz ratio. That being said, I am assuming you are stepping up 115 vac to 230 volt vac. The motor is going to run faster at 60 hertz than at 50 hertz. If the motor was rated for 1,500 rpm at 50 hertz, it will now rum 1,800 rpm. Depending on the application, you could very easily overload the motor because the Hp requirement at 1,500 rpm is very different than the HP requirement at 1,800 rpm. This is especially true for pumps and fans. You will need to change pulleys to keep the gearing thesame.
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2 years, 3 months ago
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Answer: 
The motor will run faster than nameplate
2 years, 1 month ago
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Answer: 
it will run about 7 percent faster at 60 hz than the name plate rpm
1 year, 5 months ago
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What are the differences between a air compressor rated motor vs a farm duty rated motor? I have a 5hp motor with a 184T frame, single phase, 1740 rpm and its for a Quicy air compressor. Just wondered if you could give me some specifics.
1 year, 8 months ago
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Answer: 
Farm duty motors are specially designed for farm duty applications requiring high starting torque and moderate starting current. Standard features include v-ring slinger on drive end and opposite drive end, reversible shaft rotation, and manual overload protection for operator safety.
A compressor duty motor is more robust, with high starting torque and heavier start windings, to handle the extra heat from continuous high load operations.
1 year, 8 months ago
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Answer: 
It has to do with duty cycle, and the environment things are going to be used in.

Different motors are designed to operate for different periods of time, and in different conditions. For instance, the fan motor in your bathroom is designed to operate for 15 minutes an hour or so a day, and in a high-humidity area, but with no airborne dust / grit, and no splashing / directed water. It's duty cycle is probably something like .15, and it is "open frame", meaning that there is no protection from environmental contaminants.

1.0 is considered constant operation. A motor that starts, and keeps running for at least an hour at a time. This would be a motor like the one in a commercial cooler, where a fan is pushing air throughout the cooler 24/7.

1.x duty motors (farm duty is in this) are motors that are designed to be able to start and stop frequently, as well as run for hours on end. A motor draws the most power when it is starting up, and because of this, more stress is put on a motor during repeated starts and stops, especially if there is a large initial torque requirement.

A motor for an air compressor is going to have to be able to handle high initial torque, frequent starts and stops, and long run times, just like a farm duty motor. The main difference is that your air compressor motor doesn't need to be designed to handle environmental issues. Farm rated motors are more likely to be TEFC type, whereas your air compressor motor is more likely to be an open frame motor.

So, if you need to replace the air compressor motor, a farm rated motor should work, but I wouldn't go the other way, unless you can provide a degree of protection from environmental contaminants.
1 year, 8 months ago
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Answer: 
A farm rated motor is designed for high staring torque like a silo unloader to get it started.Then the torque requirements are less..The standred motor has lower starting torque ,but as the compressor builds pressure the torque requirements increase. so it is designed to handle the added load as the compressor increases its pressure drawing less amps So a farm rated motor vs a standred motor with the same pulley will draw higher amperage on the top side of the pressure cycle approx 10-15 % You can use a farm rate on a compressor if you use a drive pulley that is 15-20% smaller in dia if you choose to go that way use a amp meter to measure amps on the top end of the cycle If your top end amps approx 28 are within the guidelines your good to go ..Your pulley will be around 6.5in at 150 psi..
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Answer: 
Air compressor motors, like the ones on your furnace blower, have a higher service factor (SF); typically 1.25 VS 1.00 or 1.15 for other motors.
The reason for this is the frequent (start/stop or on/off) duty cycle of compressors & furnace blowers.

You can put in a motor with a 'lower' service factor in your application; the horsepower, speed, voltage, frame & enclosure are more important.

Bring your old motor in for an expert analysis!
4 months, 1 week ago
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2 years, 5 months ago
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Answer: 
Hello,
This type of gear motor requires some more info, we do not currently carry a stock 1/2 HP gear motor.
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2 years, 5 months ago
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Answer: 
We currently do not have a gearmotor with those two specifications. There are several options that may work though. I suggest giving Grainger Technical Support a call so a specialist can make suggestions so you can know all of your possible options.

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Disclaimer:

The source for the answers given by Grainger in Ask and Answer are based on the information provided with the question, which may not be complete or may not apply to other situations, and based on product literature and informational materials, the content of which is provided by Grainger’s product suppliers. Grainger disclaims liability for any information it provides in Ask and Answer which later may be alleged or determined by a court of law to be inaccurate or incorrect. The answers given by Grainger in Ask and Answer are not intended to replace or supplement any professional, engineering or other consultation services available to its product users. Always read, understand, and follow the product information and instructions provided by the manufacturer.
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2 years, 5 months ago
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Answer: 
There are permanent magnet (PM) DC gear motors which are better suited for this low RPM. BALDOR manufactures these fractional horsepower gear motors AND matching power supplies which will 'plug in' to your 115/120Vac single phase, and 'convert' to 90Vdc.
The drive/power supply also has a speed & torque control so you can set up the best output RPM & torque for your process.
5 months, 2 weeks ago
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2 years ago
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Answer: 
The mention of motor shaft rotation for electric motors is referencing the shaft end unless otherwise specified. CCWSE means counter clock-wise shaft end orientation. CCWLE means the shaft turns counter clock-wise lead end, meaning the side of the motor where leads exit the motor will rotate CCW.

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1 year, 11 months ago
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Answer: 
The rotation of a motor is usually on the nameplate if it is a single phase motor. On a three phase motor, there is a tester available to determine the motor rotation. You look at the motor from the drive end.
1 year, 8 months ago
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Answer: 
If you're doing a new installation, "Bump Test" the connected (not coupled# motor & see which way it rotates. You can reverse the direction of rotation by reconnecting some of the leads #on a single-phase motor; check the wiring diagram#, or changing just two leads #phase connections) on a three-phase motor.

If you're trying to describe if a motor rotates CW or CCW, look at the end of the motor shaft dead-on, and use that as your reference for CW or CCW rotation.
4 months, 1 week ago
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i want to couple that motor with a foam pump.
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2 years, 4 months ago
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Answer: 
We do not have a 2HP, single phase motor in a hazardous location type at this time.

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2 years ago
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Answer: 
You need to know what the FRAME is for this motor; it should be on the nameplate (e.g. 56C, 145TC, etc.) if it's a domestic/US make. If it's a metric frame, it will be something like 112M, 132S, etc.

The best way to try & match this up electrically, mechanically and physically from a local supplier like WW Grainger is to bring the motor in so their applications specialists can check the motor & nameplate.

If the motor is what's called an OEM (Original Equipment Manufacture), you may be stuck calling whoever built the foam pump.
4 months, 1 week ago
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Can motor direction be changed, if so, how?
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2 years, 3 months ago
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Answer: 
The direction of this motor can not be changed.

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2 years, 2 months ago
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Answer: 
No. If a motor direction is reversible, the description will specify that.
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2 years, 2 months ago
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My old Emerson Electric 30" whole house fan has a 1/2 hp motor and is rated 5550 CFM. The Dayton 30" whole house fan has a 1/3 hp motor and is rated 7600 high/ 5100 low. (1) are motors today more powerful? (2) could I get a 1/2 hp motor on the 30" Dayton unit? (The old Emerson unit needs to be replaced.)
2 years, 1 month ago
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Answer: 
Motors are not more powerful today. A 1/2 HP motor today is pretty much the same as a 1/2 HP motor was years ago. But some of the engineers are sharper today. That is how this unit moves more air, it is all in the design. There is no need to replace the motor. Just enjoy the higher efficiency and cost savings.

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2 years, 1 month ago
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Answer: 
Note: No one from Grainger reads these questions, they are trying to get other people to answer your questions. I don't work for them, but I do work with motors. Take my advice with a grain of salt.

Fan blade design has probably improved somewhat over the years, allowing a smaller motor to move more air. Alternatively, Emerson may have just chosen to use a bigger motor so it wouldn't operate as hard, and would last longer.

As far as your question 1, no. A HP is a HP.
on Q2, possibly. You would need to find a cross referenced motor, or find a motor that matches the physical dimensions, shaft diameter / length, and mounting style as the OEM motor.

Best thing to do is to get a model and serial number off of the motor, and either call grainger, or another motor distributor. If you call Grainger, they will put you on the line with a tech support person, who can help you cross to a new motor. Give them the number, and if it wasn't a custom motor, they should be able to cross it for you. If it was a custom motor, you will have to order direct from Emerson, or just replace the whole thing.
2 years, 1 month ago
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I am looking for a motor that auto reverses. I need to hook it to a pulley system that once the line runs out it reverses back to rewind the line back up?
1 year, 10 months ago
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Answer: 
Many motors will reverse. It is mostly a matter of an external switching design. For example, a piece of equipment like this would employ limit switches that will operate when something contacts the switch paddle. Give Grainger's Technical Product Support Team a call with specifics and they can find the right parts to help you get the job done.

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1 year, 10 months ago
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Answer: 
Are you designing the controls for this application yourself or are you replacing parts in an existing system?
As long as the motor's rotation can be electrically reversed, the correct relays/starters and switches in their correct spots will do the trick for you.
1 year, 8 months ago
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1 year, 9 months ago
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Answer: 
We do not stock a Baldor motor with those specifications. We do have several other branded motors that are compatible with your motor such as our Dayton 4GZC4. Our Dayton motor has a standard 3 year warranty. After double checking your specs, give us a call at 800 472 4643 to find out your delivery options.

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1 year, 9 months ago
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Answer: 
A three-phase 15Hp 230/460Vac 1800RPM motor is standard in the 254T frame in a TEFC (Fan Cooled) or DP (Drip Proof) enclosure.

You list the RPM as 1700; what does the motor nameplate say? A Four-Pole motor is 1800RPM 'synchronous speed,' but the nameplate will always be LESS; 1775RPM, 1760RPM, etc.
If the RPM on your motor is much less than 1800, and closer to 1700 e.g. 1725, 1710, etc., then see if the nameplate also shows the NEMA design. The higher RPM is a #standard# NEMA 'B' or 'C' design. The lower RPM may be a NEMA design 'D'; which is called 'High Slip,' and produces much higher starting torque.
NEMA design 'D' motors are used on punch presses, forges, etc., where you have to start a heavy inertial load.
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WAS GIVEN A EXAUST FAN SETUP FOR MY SHOP. IT WAS HARD WIRED BEFORE. I WENT TO PUT ON A NEW PLUG BUT THERE IS 2 BLACK WIRES AND ONE GREEN??? I TOOK OFF THE PLATE ON MOTOR TO EXPOSE CONECTIONS. WHAT # IS LIVE AND SO ON.
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Answer: 
It is very possible the motor is of a shaded pole type (single-speed). Basically, it doesn't matter which one is connected to hot or netral, as long as you are providing 115V and the supply wires are sized correctly.
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Answer: 
If it is single phase AC, it doesn't matter which is hot and which is neutral or common.
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