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Micro Brushless Motors

Sanyo DC Motor Division (Bensenville, IL) offers the PM Series brushless micro motor that incorporates a ceramic air bearing design, using air as a lubricant to solve problems encountered with typical motors lubricated with oil. The motors are available in a 20-mm size and are designed for applications requiring high speed and quiet operation at high temperatures. The sleeve and shaft of the ceramic air bearings contain a 3- to 5-micron gap between them. At the top of the shaft, magnets repel each other, and once the motor starts spinning, static air pressure is created in the gap. This allows the motor to operate without contact between the sleeve and the shaft. The sensorless motor has a standard operating voltage of 12 VDC and load current of approximately 70mA. Typical speed is 10,000 RPM and operating temperature ranges from 0 to 90 °C.

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Hypoid Gearheads

Alpha Gear Drives (Bartlett, IL) has introduced a range of hollow-shaft right-angle hypoid gearheads for worm, bevel, or hypoid applications. The HG+ device is a low-backlash hypoid gearhead in a right-angel design that features high torque, speed, and gear ratios in a single-stage unit. The TK+ hypoid gearhead features a hollow-shaft flange output, and the SK+ is designed for positioning tasks implemented with a rack-and-pinion system. The unit is supplied with the pinion preassembled on the gearhead.

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Roller Bearings

SKF USA (Kulpsville, PA) offers cylindrical roller bearings with logarithmically crowned rollers that provide improved contact geometry between the roller and raceway, reducing stresses under high loads. The bearings feature a precision-honed inner and outer ring, raceways, and rollers for improved lubricant effectiveness. They incorporate single-, double-, and multiple-row designs differing in arrangement, design, and construction of the retaining flanges. Available bore sizes range in diameter from 0.9843 to 39.3701". Cage materials include molded glass fiber-reinforced polyamide or optional machined brass and pressed steel.

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Rotary Union

Duff-Norton (Charlotte, NC) offers the 1900 Series Rotary Union® that provides a rotating seal between fluids and a revolving roll or drum. Commonly conducted media are water, hot oils, chemicals, hydraulics, and air. The union is designed for very high pressure applications to 10,150 psi, and with maximum temperature ratings to 248 °F. Standard models feature nickel-treated carbon steel or stainless steel construction, and a double-acting thrust bearing and bronze bushing. Sizes range from 1/4 to 3".

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Nanopositioning Controller

PI, L.P. (Auburn, MA) has introduced the E-621.CR modular controller for piezo-driven nanopositioning systems that features high-bandwidth analog and networkable digital interfaces. The controller integrates a low-noise piezo power amplifier, a high-speed servo controller, sensor electronics for absolute-measuring capacitive nanopositioning sensors, and 20-bit A/D and D/A converters.

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Brushless Motor

Maxon Precision Motors (Burlingame, CA) has introduced the EC-16 sterilizable brushless motor that has been assembled so that the coils are outside the rotor, providing good heat dissipation. Steam sterilization is specified at 273 °F at up to 2.3 bar for 20 minutes. The motor can be sterilized at least 100 times in an autoclave. The diameter is 0.63" with a length of 2.2". Continuous output power is 40 watts, while maximum speed is 50,000 RPM. Ambient temperature range is -4 to 275 °F, and maximum continuous torque is up to 1.78 oz-in, depending on the winding. The motor uses high-energy samarium cobalt magnets for a mechanical time constant of 5 ms. A sterilizable gearhead is available in 55 ratios ranging from 3.8:1 to 4592:1 with a maximum input speed of 8,000 RPM.

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Rotary Transducer

SpaceAge Control (Palmdale, CA) has released the Series R rotary transducer that provides rotational measurements from 1 to 150 turns. The rugged device uses ThreadSensor™ technology for accurate and repeatable measurements in rotational sensing. Applications include potentiometers, encoders, resolvers, and synchros. Dual and quad redundancy features are available in the same package for failsafe or mission-critical applications.

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