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Thread: Blower Motor Control

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  1. #1
    Retired tool & Die and Mechanic Giles's Avatar
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    Question Blower Motor Control

    Can I use a variable speed switch with this type motor?
    http://www.surpluscenter.com/item.as...tname=electric

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    DIYer, not in the trades LLigetfa's Avatar
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    I would ask the folks at Fasco. mailto:fascohelp@RegalBeloit.com

    I have a variable speed control on my wood burning fireplace and have been trying to find one that produces less hum. It has been trial and error and my failures are now speed controls for ceiling fans.

  3. #3
    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by Giles View Post
    Can I use a variable speed switch with this type motor?
    http://www.surpluscenter.com/item.as...tname=electric
    no .

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    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Giles View Post
    Can I use a variable speed switch with this type motor?
    http://www.surpluscenter.com/item.as...tname=electric
    What type of switch was you going to use ?

    It can be operated at a lower speed but you would have to use the correct controller.


    DonL
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  5. #5
    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by DonL View Post
    What type of switch was you going to use ?

    It can be operated at a lower speed but you would have to use the correct controller.


    DonL
    If one used the correct controller would it be a switch?
    Would it be a VFD controller?

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
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    There's JW taking things literal again. It must be a common OCD with teachers as I had a few teachers like that.

    All of my variable speed controllers also have a switch. Some motors are speed controlled by simple switches but I'm sure that is not what the OP had in mind.

  7. #7
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by jwelectric View Post
    If one used the correct controller would it be a switch?
    Would it be a VFD controller?
    That must be a trick question.

    Mostly any electronic device that controls anything electronic are an electron switch.

    That is why I ask , What type of switch. It may be a Mechanical switch.

    A lot of them blower motors can operate at different speeds just by connecting the voltage tap
    that the motors have built in.

    Restive or taped transformer can be used for a motor that requires 60 HZ. You have to control the voltage but keep the frequency at 50 - 60 or around.


    Tell me the answer JW, How would You do it ?

    The way that I would do it would depending on the application.


    But it can be done.


    DonL
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  8. #8
    Electrical Contractor/Instructor jwelectric's Avatar
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    On an electric motor to control the speed one has to control both voltage and frequency thus no switch but a variable frequency drive is used to control the speed.

  9. #9
    General Engineering Contractor ballvalve's Avatar
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    You can vary the air output and reduce the amp draw by restricting the air inlet. Cardboard is cheaper than a VFD.

  10. #10
    DIY Senior Member Rich B's Avatar
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    Quote Originally Posted by jwelectric View Post
    On an electric motor to control the speed one has to control both voltage and frequency thus no switch but a variable frequency drive is used to control the speed.

    I have a variable motor speed controller that I have used for 20+ years to change the speeds infinitely on a die grinder. Full speed is fine using a carbide cutter.....but switch to a paper roll with an extension and it's way to fast.....



    I will test it for you and see if your correct....I am somewhat skeptical as to the HZ being reduced with the voltage on the item I have due to it's small size....and the fact that is at least 20 years old and there are likely no "hi-tech" components in it....

    I have a Fluke meter that reads frequency.....or HZ as it is usually called these days. I use it all the time on generators.

    I'll report back tomorrow on what I see on my meter...

    The company that offered the speed controllers may not be still making them......Their business went down as almost all electric hand tools started to come with built in speed control.....Their products were advertised as being able to control speed without a loss of torque or drive power and they work very well.....I don't recall where I bought it but it might have been Grainger.....It is fused and has a rocker switch for full speed or variable and a dial for speed......It is small ...maybe twice the size of a pack of cigarettes.....I will have to look at it's current rating.....My guess is 10 @ 120volts.......I have used more than one and they were all the same in size and operation........and cost under $100.....
    Last edited by Rich B; 11-01-2011 at 04:53 PM.

  11. #11
    Electrician ActionDave's Avatar
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    Quote Originally Posted by jwelectric View Post
    On an electric motor to control the speed one has to control both voltage and frequency thus no switch but a variable frequency drive is used to control the speed.
    I don't think so Tim.

  12. #12
    General Engineering Contractor ballvalve's Avatar
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    Quote Originally Posted by Giles View Post
    Can I use a variable speed switch with this type motor?
    http://www.surpluscenter.com/item.as...tname=electric
    that was the question, fasco answered it for free with this elegant solution:http://www.surpluscenter.com/item.as...tname=electric.

    Why not open a new fun thread and duke it our about speed controllers on the hundreds of types of motors made.

  13. #13
    Electrician ActionDave's Avatar
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    You can change speeds on a motor by varying the frequency or the voltage, but you don't need to do both.

  14. #14
    Jack of all trades DonL's Avatar
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    Other than Ballvalve's Idea.

    The cheapest way to change the speed of a brush-less AC motor, Is to use Capacitors or / and Resistors.
    Last edited by DonL; 11-03-2011 at 07:08 AM. Reason: Op Error
    Theory only works perfect in a vacuum.

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  15. #15
    DIY Senior Member BobL43's Avatar
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    Quote Originally Posted by ActionDave View Post
    You can change speeds on a motor by varying the frequency or the voltage, but you don't need to do both.
    Depends (not the underware type) http://cr4.globalspec.com/thread/550...wer-and-Torque
    I am definitely not a pro plumber, but I am a pro crastinator

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