Tag Archives: VFD

VFD on Fans, Pumps or Blowers

Posted April 11, 2016 by Pepper Hastings

Categories: Blog, Yaskawa Drives

Tags: , ,

Why use a VFD on Fans, Pumps or Blowers? First, visualize your production facility:

  • How many fans are started and stopped using a starter.
  • What about pumps and blowers?
  • How many of those use a started to control stopping and starting?
  • Are you able to control the speed or flow?
Using a VFD on pumps, like this sewage treatment pump, can reign in energy costs and extend the life of the motor running the pump.

Using a VFD on pumps, like this sewage treatment pump, can reign in energy costs and extend the life of the motor running the pump.

Biggest question (and most costly) is: Are you wasting money and energy?

These are just a few simple questions that should start you thinking about better application control, which most times leads to energy savings. A variable frequency drive (VFD) might be your answer.


Simple Math Proves Savings

Most pumps, fans and blower systems are powered by induction motors. The energy used by an industrial induction motor is a function of the speed it runs at. In an induction motor, the power used by the motor varies depending on the cubed value of the motor’s speed. If the motor’s speed is raised, energy consumption increases. If the motor’s speed is lowered, so is energy use.

When you use a starter to start that induction motor, the motor comes on at full rated speed. This creates an inrush of electricity as well as full wear and tear on the motor and the motor housing. VFDs have the ability to run motors at a percentage of rated speed and, with limits, even above rated speed if desired.

Now about that energy savings. If you use a VFD run a motor at 50% rated speed, you are reducing the energy it takes to run the motor at rated speed by nearly 88%. How did I get this you might ask? Take the .5 speed and cube it. That is .5 x .5 x .5 = .125 or 12.5%. This means at half speed you are only using 12.5% of the same energy at full speed: That’s an 88% reduction. It sound like a lot of math, but contact me and I can walk you through it if needed. We do a ton of VFD work so I am happy to help.

Yaskawa Electric has an awesome online tool called the Yaskawa Energy Savings Predictor for estimating your own energy savings. Plug in some parameters and see what you think.

Without a VFD on a fan, or pump or blower, there is no other way to reduce the speed to realize this kind of savings. On pumps you may have a control valve. This valve controls flow or pressure. This consumes the same amount of energy on any position as motor speed is at rated speed the entire time. Fans might use a 2-speed motor but those motors lack the capability to vary motor speed to keep within the application needs. A VFD allows you to take process inputs and better control your application needs on fans, pumps and blowers.

Dan Mahoney


Dan Mahoney helps plant engineers and automation and controls planners in the Houston area for Innovative-IDM. He's a member of the President's Club and can be contacted at dan.mahoney@iidm.com

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Application Note: Going From DC Motors to a Synchronized System of AC Motors and Drives

Posted December 27, 2011 by Pepper Hastings

Categories: Yaskawa

Tags: , , , ,

by Kat Trick, Applications Engineer, Innovative-IDM

Overview:  At one company, there is what they call a brine box. There is a saltwater tank setup that slows an electric motor saw. Within this setup, they use three DC motors. They decided they would like to change the DC motors to AC motors. In addition to changing from DC to AC, they would like to implement speed control between the motors including the ability to decelerate the motors at the same time, and at the same rate.

The Solution: We selected the AC motors to match the required speed and torque needed for the application. This information was obtained by analyzing the load conditions and from the specifications at which the DC motors were running the application. For speed control, the simple solution was to daisy chain Yaskawa drives. This allowed the drives to communicate with each other, as well as synchronize their deceleration.

The Results:  The AC motors can be rated to give the same performance, or higher performance, as the DC motors.The AC drives can provide for controlled acceleration and deceleration rates. Connection between the drives allows for the synchronization of the acceleration and deceleration rates.The Yaskawa drives have the ability for the parameter setting to be extracted. This would make programming the drives to be easier by setting the parameters in one, and just copying the parameters from that one to the other two.

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Welcome: Yaskawa J1000 Drive

Posted August 20, 2008 by Pepper Hastings

Categories: Yaskawa

Tags: , , , , , , , ,

Neil, Todd and the marketing guys at Yaskawa got this out to us Friday and I intended to put the information here this past weekend.

But it rained Saturday and Sunday in North Texas (in August!) and all most of us could do was just stand stupified and watch.

So, a belated welcome to the newest drive from Team Y, the Yaskawa J1000. You can get all the FAQs on this little powerhouse here.

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Ramping to 10 Million AC Drives: Yaskawa Milestones

Posted July 24, 2008 by Pepper Hastings

Categories: Yaskawa

Tags: , , , ,

In June, Yaskawa said it shipped its 10 millionth AC drive since 1974 of production. 

Raw math says that's about 300,000 drives shipped per year, but the uptick is much more dramatic than that. Here's a look at how the demand for Yaskawa AC drives ramped up over the past three decades.

Click on the image (above) for a closer look at this interesting timeline graphic.

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Cool Gadget for June

Posted July 8, 2008 by Pepper Hastings

Categories: Yaskawa

Tags: ,

In our free newsletter, we have a segment devoted to cool gadgets that we either sell, service or use out in the shop. Here's last month's installment. Relax, it's only two minutes. 
[youtube=http://www.youtube.com/watch?v=Kv7dlNiT1Yg] Read More