Blower Motor Control

Discussion in 'Electrical Forum discussion & Blog' started by Giles, Oct 30, 2011.

  1. Giles

    Giles Retired tool & Die and Mechanic

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    N.W. Alabama--Florence--
  2. LLigetfa

    LLigetfa DIYer, not in the trades

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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. jwelectric

    jwelectric Electrical Contractor/Instructor

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  4. DonL

    DonL Out of the Trades

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  5. jwelectric

    jwelectric Electrical Contractor/Instructor

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    If one used the correct controller would it be a switch?
    Would it be a VFD controller?
  6. LLigetfa

    LLigetfa DIYer, not in the trades

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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. DonL

    DonL Out of the Trades

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    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
  8. jwelectric

    jwelectric Electrical Contractor/Instructor

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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. ballvalve

    ballvalve General Engineering Contractor

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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. BobL43

    BobL43 DIY Senior Member

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    I agree, but then you can use a linear actuator motor and its controls to operate the cardboard damper:D
  11. ballvalve

    ballvalve General Engineering Contractor

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    And a VFD to control the linear actuator motor!

    It would be a metal or cardboard restrictor. So says the smart a&% student.

    Lest anyone doubt my point, here is a Fasco rig that has ALREADY heard my idea and put it into production.

    http://www.surpluscenter.com/item.asp?item=16-1404&catname=electric

    Remember the first and second rule of design : KISS
    Last edited: Nov 1, 2011
  12. BobL43

    BobL43 DIY Senior Member

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    whoo hoo! suction throttling; no lips

    the linear actuator motors we use have digital positioning feedback to a counter module. gets interesting.
  13. Rich B

    Rich B DIY Senior Member

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    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: Nov 1, 2011
  14. BobL43

    BobL43 DIY Senior Member

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    There is more than just one type of speed controller design for AC motors. The Voltage/Frequency charactaristic is often a programmable parameter that is designed for the machine function. Years ago, the designs were more basic and brutal on motors. today, the drives and motors are designed to work well with each other and offer protection against overload damage. And then there is pulse width modulation speed control
    Last edited: Nov 1, 2011
  15. ActionDave

    ActionDave Electrician

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    I don't think so Tim.
  16. jwelectric

    jwelectric Electrical Contractor/Instructor

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    Please don’t be shy, explain
  17. ballvalve

    ballvalve General Engineering Contractor

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  18. ActionDave

    ActionDave Electrician

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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.
  19. DonL

    DonL Out of the Trades

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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: Nov 3, 2011
  20. BobL43

    BobL43 DIY Senior Member

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