S   LUTIONS

Welcome to   S    LUTIONS, a monthly newsletter provided by Jacco & Associates. Jacco’s focus on system knowledge provides you with the engineering support and product solutions for your applications.

 61 Milford Dr.  Hudson, OH  44236  Phone:(330) 463-0100  Fax:(330) 463-0101

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Questions or comments? E-mail us at opportunity@jacco.com

Question:    What is the slip of an AC induction motor with a synchronous speed of 1800 rpm and a rotor speed of 1760 rpm?

                   a.) 2.2%     b.) 3.2%     c.) 4.2%     d.) 5.2%

 

Prize:         Taylor Made Tour Burner Rescue Hybrid!

Respond by May 15^th with the correct answer to be entered in the raffle for this month’s prize!

Question:  BACnet began development under Standards Project Committee 135P in June of what year?

 

Answer:    b.) 1987. Congratulations to Bill Shepardson for winning a set of portable outdoor chairs!

Electrically Commutated (EC) Motors

The two most common electronic devices to vary fan speed in HVAC equipment are the variable frequency drive (VFD) and the electronically commutated (EC) motor.  The VFD uses an alternating current (AC) induction motor with a controller that  varies the motor speed by varying the frequency and voltage of the signal applied to the motor.  The EC motor is a direct     current (DC) electric motor that converts an AC signal to a DC signal and uses electrical sensors, instead of the mechanical brushes used in the traditional DC motor, to commutate the motor.

EC Motors Are Available For Condenser Fans, Supply Fans and Exhaust Fans in Aaon HVAC Systems.

For More Information On EC Motors Go To www.jacco.com/media.php

EC Motor VS AC Induction Motor:

* Permanent Magnets In Lieu Of Stator Magnets

* Consistent Sound Levels At Varying Speeds

* Consistent Efficiency At Varying Speeds

* No VFD Required