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issue: November 2003 APPLIANCE Magazine

Motor Technology
EC Motor for HVAC Applications

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Wellington Drive Technologies Ltd. of Auckland, New Zealand has introduced a new, high-power 92-mm external rotor motor for heating, ventilation, and air-conditioning (HVAC) applications.

Recently introduced at the IKK 2003 fair in Germany, the new DD070 from Wellington Drive Technologies, Ltd. is a 200-W, 92-mm diam external rotor motor that can be used in conjunction with forward-curved, backward-curved, or axial fans in HVAC applications.

The motor is part of Wellington Drive Technologies, Ltd.'s DE066 series of 92-mm external rotor motors. The new DD070 motor was designed in response to customer demands for a higher-power motor, according to Marta Di Domizio, commercial manager for Wellington Drive Technologies. The new 200-W motor also reportedly offers manufacturers high energy efficiency and low noise in applications such as air-conditioners, whole-house ventilation systems, and heat recovery.

"I would say probably on average, the DD070 is three times more efficient than traditional motors used in this sort of application," Ms. Di Domizio tells APPLIANCE. "With a higher power motor like the DD070, the energy savings are more relevant than with a lower power motor like the DE066, which is rated at 60 W. The larger the dimension, the more power you save with energy-efficient motors. So it also becomes more cost effective," she explains.

The higher efficiency, she adds, is due to a state-of-the-art electronically commutated (EC) technology, which is based on a Wellington-designed microprocessor. "This allows high energy savings at the control level and not just at the motor level," says Ms. Di Domizio.

The new motor utilizes the company's proprietary construction method, which includes the extensive use of engineering polymers (such as DuPont(TM) Rynite(R) PET thermoplastic resin and Zytel(R) nylon resin), coupled with a slotless design that doesn't use the traditional stamped lamination stack.

According to Wellington, these features combine to create a lightweight, compact motor with low noise and low vibration.

"Using a slotless design without stamped laminations means that you don't have a large amount of metal in the middle of your motor. We significantly reduce the weight and size of the motor because the lamination accounts for a large portion of traditional motors," explains Ms. Di Domizio.

"We also don't have problems with rust," she adds. "Motors with stamped laminations, especially when you're working in an environment with a lot of humidity and moisture, tend to rust, which then creates reliability and durability problems. By not having stamped laminations, we overcome this problem."

The motor's plastic components are said to be the main reason for its reduced noise levels. The company's tests show that the DE066 and DD070 motors are five-times quieter than typical PSC motors when operated in the same fan assembly, giving a 100-Hz test result of only 29.2 dBA.

"I don't believe any other motor manufacturer makes motors with the amount of polymers that we do," notes Ms. Di Domizio. "This, together with the simplicity of the design and the reduced number of components, allows for reduced noise."


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