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Thread: Belt grinder motor questions.

  1. #1
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    Belt grinder motor questions.

    I plan on building a 2x72 belt grinder. I have a DC treadmill motor. What's the easiest way to wire and control the speed? Also if this motor doesn't work what kind of motor and controller do i need for a belt grinder? Thank you.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by Need Advice View Post
    I plan on building a 2x72 belt grinder. I have a DC treadmill motor. What's the easiest way to wire and control the speed? Also if this motor doesn't work what kind of motor and controller do i need for a belt grinder? Thank you.
    A few members have really nice build threads on WW with good info maybe do a search.


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    Re: Belt grinder motor questions.

    Quote Originally Posted by Lis2323 View Post
    A few members have really nice build threads on WW with good info maybe do a search.


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    Ok, I will. Thank you.

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    Belt grinder motor questions.

    Siemens 2HP 3 phase 3470 RPM sealed motor

    TECO 510E IP66 (dustproof rated) NEMA 4 vfd with speed control






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    Last edited by Lis2323; 09-18-2021 at 07:14 PM.
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    Re: Belt grinder motor questions.

    Quote Originally Posted by Lis2323 View Post
    Siemens 2HP 3 phase 3470 RPM sealed motor

    TECO 510E IP66 (sealed) NEMA 4 vfd with speed control






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    That's a nice grinder. It looks expensive though. How much knowledge is needed to wire something like that? I'm looking for cheap and easy.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by Need Advice View Post
    . How much knowledge is needed to wire something like that? I'm looking for cheap and easy.
    Pretty easy. Trust me. If I can do it you can


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    Re: Belt grinder motor questions.

    Quote Originally Posted by Lis2323 View Post
    Pretty easy. Trust me. If I can do it you can


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    I tried to google that motor but only got the controller in search results. The controller is expensive. The motor probably is too i assume. I need something cheap. I know that's a lot to ask for sometimes.

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    Re: Belt grinder motor questions.

    VFDs have dropped in price tremendously in the past few years.

    I recently bought one with the same specs off eBay for under $300usd

    The German motor and TECO vfd in the photos will probably be in the vicinity of usd$1000 .

    Using Made in China motors and eBay VFDs will be likely 60% cheaper.

    For speed control you can eliminate the VFD and use pulleys to save $


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  10. #9
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    Re: Belt grinder motor questions.

    Quote Originally Posted by Lis2323 View Post
    VFDs have dropped in price tremendously in the past few years.

    I recently bought one with the same specs off eBay for under $300usd

    The German motor and TECO vfd in the photos will probably be in the vicinity of usd$1000 .

    Using Made in China motors and eBay VFDs will be likely 60% cheaper.

    For speed control you can eliminate the VFD and use pulleys to save $


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    Thanks for the info. The pully info is helpful.

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    Re: Belt grinder motor questions.

    I need to run my 2.5 HP DC motor on AC current. What's the easiest way to do that? Also what's the easiest way to control the motor speed?

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    Re: Belt grinder motor questions.

    If you donít have the treadmillís accompanying parts I would just watch for a free complete one.

    Before you do that I would investigate further as to the feasibility of your application first.


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    Re: Belt grinder motor questions.

    Quote Originally Posted by Lis2323 View Post
    If you don’t have the treadmill’s accompanying parts I would just watch for a free complete one.

    Before you do that I would investigate further as to the feasibility of your application first.


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    I dont have the other parts. I know you can get rectifiers to turn AC into DC, and i know they have DC motor controllers, but im not sure how to wire them. I guess i was hoping someone already did this and could help. They have YT videos on this, i guess that's my only option at this point. I just hate searching through videos looking for a good one. Not all videos are helpful.

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    Re: Belt grinder motor questions.

    Lol, YT video's suck sometimes. I guess I can always use step pulleys on an AC motor instead.

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    Re: Belt grinder motor questions.

    My plan is to just use the treadmill controller. May use the incline system for belt tension - I don't know - haven't tore into it yet to see.

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    Re: Belt grinder motor questions.

    First you would need to know the voltage of the motor to find compatible speed control converter. The speed controllers must pulse the voltage for the speeds. Same voltage with pulse modulation. Some are not hugely expensive but thinking for a 2.5 hp it may cost a few bucks.

    Is there a spec plate on the motor. It is likely either 90 volt or at that HP it may be a 180 volt motor.

    Thinking the price on those will put the project over budget pretty fast. Guessing $300 to $600 for that size controller.
    Last edited by danielplace; 4 Weeks Ago at 09:52 AM.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by danielplace View Post
    First you would need to know the voltage of the motor to find compatible speed control converter. The speed controllers must pulse the voltage for the speeds. Same voltage with pulse modulation. Some are not hugely expensive but thinking for a 2.5 hp it may cost a few bucks.

    Is there a spec plate on the motor. It is likely either 90 volt or at that HP it may be a 180 volt motor.

    Thinking the price on those will put the project over budget pretty fast. Guessing $300 to $600 for that size controller.
    Its a 95v motor.

  20. #17
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    Re: Belt grinder motor questions.

    Quote Originally Posted by danielplace View Post
    First you would need to know the voltage of the motor to find compatible speed control converter. The speed controllers must pulse the voltage for the speeds. Same voltage with pulse modulation. Some are not hugely expensive but thinking for a 2.5 hp it may cost a few bucks.

    Is there a spec plate on the motor. It is likely either 90 volt or at that HP it may be a 180 volt motor.

    Thinking the price on those will put the project over budget pretty fast. Guessing $300 to $600 for that size controller.
    I've seen people on YT use an AC motor controller and then send the current to a rectifier and then to the motor. If i use a DC motor controller does it have a built in rectifier or do i still need one of those as well?

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    Re: Belt grinder motor questions.

    Quote Originally Posted by Need Advice View Post
    I've seen people on YT use an AC motor controller and then send the current to a rectifier and then to the motor. If i use a DC motor controller does it have a built in rectifier or do i still need one of those as well?
    If it is setup for the incoming A/C voltage(120 volt) you have to feed it with then the output of controller should go right to the motor. How many wires come out of the motor. It may have a sensor that gives feedback to original controller so it can maintain rpm under different loads. You may be able to do without that as 2.5 hp will have plenty of torque if fed with proper controller that pulses the power to control the rpm. It maintains most of it's torque because the voltage isn't low it just isn't there 100% of the time.

    Small 90 volt DC output 120 volt input pulse modulated controllers are cheap but 2.5 you may have to spend a little.

    If you were electrically savvy and had a complete tread mill you could maybe be able setup the controller to work but it would still require very good electrical skills to make it ready to use as a control. So much of them is so integrated today that it may not be as easy as you would like. Maybe if you use the panel and wiring harness in it's entirety from the treadmill that would be doable.

  22. #19
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    Re: Belt grinder motor questions.

    Quote Originally Posted by danielplace View Post
    If it is setup for the incoming A/C voltage(120 volt) you have to feed it with then the output of controller should go right to the motor. How many wires come out of the motor. It may have a sensor that gives feedback to original controller so it can maintain rpm under different loads. You may be able to do without that as 2.5 hp will have plenty of torque if fed with proper controller that pulses the power to control the rpm. It maintains most of it's torque because the voltage isn't low it just isn't there 100% of the time.

    Small 90 volt DC output 120 volt input pulse modulated controllers are cheap but 2.5 you may have to spend a little.

    If you were electrically savvy and had a complete tread mill you could maybe be able setup the controller to work but it would still require very good electrical skills to make it ready to use as a control. So much of them is so integrated today that it may not be as easy as you would like. Maybe if you use the panel and wiring harness in it's entirety from the treadmill that would be doable.
    There are 4 wires on the motor, a black, red and two blue wires that are for a overload protection sensor. I dont need the blue wires.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by Need Advice View Post
    There are 4 wires on the motor, a black, red and two blue wires that are for a overload protection sensor. I dont need the blue wires.
    This shows up to 2 hp if you power the drive with 240 with proper resistor and heatsink. Hard to find reasonably priced ones sized larger. Maybe it would do it.

    https://www.walkerindustrial.com/KBM...tent=KBMD-240D

    They have a bunch. Maybe you can find what is needed there somewhere.

    https://www.walkerindustrial.com/AC-...Drives-s/2.htm
    Last edited by danielplace; 4 Weeks Ago at 09:42 PM.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by danielplace View Post
    This shows up to 2 hp if you power the drive with 240 with proper resistor and heatsink. Hard to find reasonably priced ones sized larger. Maybe it would do it.

    https://www.walkerindustrial.com/KBM...tent=KBMD-240D

    They have a bunch. Maybe you can find what is needed there somewhere.

    https://www.walkerindustrial.com/AC-...Drives-s/2.htm
    Thanks. If i used that motot control would i still need a rectifier?

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    Re: Belt grinder motor questions.

    Quote Originally Posted by Need Advice View Post
    Thanks. If i used that motot control would i still need a rectifier?
    No these drives do all that. They take the 120 or 240 AC and output 90 VDC

    My mill runs a 90 volt DC motor with a drive like these. Not 2.5 hp though.

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    Re: Belt grinder motor questions.

    Quote Originally Posted by danielplace View Post
    No these drives do all that. They take the 120 or 240 AC and output 90 VDC

    My mill runs a 90 volt DC motor with a drive like these. Not 2.5 hp though.
    Cool, that's easy. Thanks

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