Speed Reducers

Rolling Motion Industries (North Babylon, NY) offers the two-way MAR-17-2-3:1 and MAR-23-2-3:1 speed reducers using Traction Drive Technology. The MAR17-2-3:1 is designed for input speeds up to 3600 rpm with 10 to 20 in/lbs of torque; the MAR-23-2-3:1 is also rated for speeds to 3600 rpm with an input of 20 to 30 in/lbs of torque. The propriety engineered traction fluid with a coefficient of friction of 0.1 to 0.12 transmits torque among the four driving and driven elements. The traction fluid changes continuously from liquid to solid and back to liquid in the microscopic spaces between the driving and driven elements. Features include low vibration and no torque losses from 10 to 3000 rpm.

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Brushless DC Motor

Allied Motion Technologies (Amherst, NY) introduced the EnduraMax 75i Series 75-mm-diameter brushless DC motor with an all-digital integrated drive. The compact, high-power-density motor is capable of controlling torque, speed, and position in a range of applications including AGV vehicle traction or steering, medical patient-handling equipment, rotary/linear actuators, pumps, and material handling systems. Three standard stack lengths are available with continuous rated power up to 370W, continuous rated torque up to 1.3 Nm (190 oz-in), and rated speed of up to 5150 RPM. The 12, 24, or 48 VDC winding voltage choices make the motor suited for battery-powered applications.

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Shaft Bushings

Zero-Max (Plymouth, MN) announced Posi-Lok® keyless shaft bushings that secure shaft-mounted components into position. They eliminate keyways that can weaken or cause excess wear to shaft components. Nine different models in a range of sizes are available as well as various material choices to meet specific application requirements such as corrosion protection and environmental considerations. The bushings slide onto a shaft and provide zero-backlash performance with minimal radial and axial runout. Available models include stainless steel, electroless nickel-plated, and standard alloy steel.

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Motor Controls

American Control Electronics (South Beloit, IL) introduced the DCL series of low-voltage, brushless motor controls that operate in the 12-48 VDC power bandwidth with up to 30 amps peak (1 minute) or 15 amps continuously. The design removes many of the trim pots and jumpers associated with typical motor controls. Base units are Modbus-capable and come with one trim pot for calibrating maximum speed and two DIP switches for closed/open loop operation. Features include voltage output to energize the field winding of a shunt-wound motor, 1.37 form factor, 60:1 speed range, and diagnostic LEDs.

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