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Reasons for Turning to Slotless DC Motor Technology

When first introduced, brushless DC motors, despite their many advantages, were cast as a costly alternative to brush-commutated motors, and were typically only specified for low-power applications where long life was the primary desired requirement. Without the mechanical brush-commutator mechanism that would wear and eventually result in motor failure, brushless motors could be relied upon to deliver performance over time. As for other advantages, conventional wisdom held that brushless motors provide high speed and fast acceleration, generate less audible noise and electromagnetic interference, and require low maintenance. Brush-commutated motors, on the other hand, would afford smooth operation and greater economy.

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Motion Solutions for Electric Expansion Valves

Expansion valves are flow-restricting devices present in any refrigeration system. The valve needle remains open during steady state of operation. The size of the opening, or position of the needle, is related to the pressure and temperature of the evaporator. When set and controlled properly, an expansion valve will keep the evaporator active throughout its operation.

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Hamburg Airport Relies on Drive Technology to Keep Bags Moving

Hamburg Airport in Germany handles nine million pieces of baggage every year. For the baggage handling staff, the reliability of the conveyor system and the prevention of faults are the highest priorities. The breakdown of even a single component of the system would result in a backlog and unacceptable delays.

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Brushless Electric Motor

maxon precision motors (Fall River, MA) offers the EC-4pole 30 brushless DC motor that features two pole pairs, and provides a nominal torque of 106 mNm and an output of 150 W. It has a hermetically sealed rotor to withstand more than 1,000 autoclave cycles. The motor is equipped with the ironless maxon winding. The torque and current behave linearly and the drive can be overloaded. It is available with an optional Hall sensor, as well as a hollow shaft with a diameter of up to 4.1 millimeters. For Free Info Visit http://info.hotims.com/55593-300

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Variable Frequency Drive

Mitsubishi Electric Automation (Vernon Hills, IL) introduces the F800 Series variable frequency drive (VFD) for precise motor speed control. The low-voltage motor is designed to improve efficiency of air movement through HVAC systems. It controls and supports multiple motor types, including AC induction and permanent magnet motors, eliminating the need to specify multiple VFDs to address various motor control needs.

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Conveyor Drive

The NORD Screw Conveyor Package from NORD Gear Corp. (Waunakee, WI) offers closely stepped speed reduction ratios and a directly coupled gearmotor or NEMA C-face input design that eliminates the need for top motor mounts, pulleys, belts, or guards. Screw conveyor drive options feature a UNICASE™ reducer housing, Quadrilip™ reducer shaft sealing, and optional high-capacity output bearings with CEMA standard flange mounting and CEMA drive shafts ranging from 1-1/2" to 3-7/16".

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Motor Brakes

X-Small motor brakes from Warner Electric (South Beloit, IL) are spring-set holding brakes for applications in industries such as aerospace and medical equipment. The electrically released brakes are designed for engaged/disengaged holding applications such as seat adjustment on airplanes, but can provide a low-cycle-rate stopping action in emergency situations. They will remain engaged in the event of a power failure, making them suited to applications where integrity of the holding force is imperative. The brake range consists of six standard sizes from 22 mm to 33.5 mm diameter, and offers up to 50 Ncm of static torque. For Free Info Visit http://info.hotims.com/55593-303

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