Motion Control

Stepper Motor Driver

Lin Engineering (Morgan Hill, CA) offers the R525 stepper motor driver that reduces overall design time and system cost for an array of step motor applications needing high torque, power, and smooth motion. Measuring 3.3 × 1.3", the driver is accommodated into most systems. It provides up to 5 amps peak of current, handles up to 75VDC, and is capable of up to 256x microstepping with a standard 1.8° motor. It features builtin RS-485 communication, and can be connected to a computer and configured via a graphical user interface, LinDriver. Configurable settings include step resolution, run current, hold current, damping modes, and sensing step pulses on the rising edge or falling edge.

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Casters

Revvo Caster Company (West Seneca, NY) offers ET Series casters designed to move moderate loads via manual propulsion. Four-inchdiameter swivel models are available with an optional fixed-position brake that mounts to the top plate so the brake is always in the same position regardless of which way the swivel wheel is facing. The swivel models feature a double-ball raceway for smooth directional movement with the capability to withstand shock loading. Fixed and swivel models are available in wheel sizes of 4" and 5" diameter with load capacities ranging from 264 to 550 pounds. Wheel types include polyurethane-on-nylon with roller bearings, and black nylon or blue rubber with precision ball bearings. Fixed models have an oblong top plate. Swivel models are available with either a special top plate for the fixed-position brake (4" diameter models only), or a standard top plate. Accessories include wheel locks for standard swivel models and thread guards to prevent debris from binding the wheel.

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Load Sensors

Pepperl+Fuchs (Twinsburg, OH) has introduced Series 61 photoelectric sensors. The UL and cUL listed sensors are available in DC models with 4-in-1™ output, and AC/DC models with SPDT relay output. Accessible controls simplify set-up and adjustments, and color-coded labels make it easy to identify a given sensor’s sensing mode. The 4-in-1 output automatically sinks or sources, depending upon the load detected. Both 4-in-1 output models and SPDT output models include Standard Diffuse mode with a 1-m or 4-m sensing range, Diffuse with Background Suppression mode with a 500-mm or 2-m sensing range, Polarized Retroreflective mode with an 18-m sensing range, and Thru-beam mode with a 60-m sensing range. AC/DC versions with SPDT relay output are capable of switching up to 3 Amps. The sensors are also available in fiber optic versions where the sensing range is dependent on the fiber cable.

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Pump Components

Metallized Carbon Corp. (Ossining, NY), offers custom vanes, rotors, and end plates for use in rotary vane pumps pumping both liquids and gases. The carbon-graphite components provide lubrication in most environments, and are suited for pumping liquids with poor lubricating qualities, strong chemicals that attack metals, and to pump air, vacuum, combustion products, and gasoline vapors. The materials are chemically resistant and are compatible with FDA food and beverage regulations. They have a low wear rate running in both gas atmospheres and low-viscosity liquids. Carbon graphite vanes can withstand the rubbing of the vane tip against the housing bore, and the rubbing of the side of the vane against the slots in the rotor. Lightweight carbon graphite rotors withstand the rubbing against the vane and the end plates.

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Stepper Motors

Plug & Drive PD2-N integrated closed-loop stepping motors from Nanotec Electronic, U.S. (Medford, MA), provide closed-loop sine commutation. They feature 71 oz-in of torque, and speed up to 3000 RPM with near-servo performance. The sine commutation position, torque, and speed control, and 12-bit encoder, are integrated inside the motor envelope. The stepper motors are used wherever speed, high precision, and compact design are required. They are characterized by high-torque stepper motors combined with dspDrive technology developed by Nanotec, and an integrated position control system with an encoder.

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Brushless DC Pump

The Thomas 230 Series, a brushless DC WOB-L® air compressor designed for applications requiring a compact, lightweight pump with variable output, is available from Thomas Division (Sheboygan, WI). The pump measures 3.8 × 2.64 × 3.63" and weighs 1.2 pounds. It features variable output (1,000 – 3,000 RPM) utilizing a brushless DC motor, an enclosed crankcase for reduced sound, and WOB-L® piston technology. Maximum flow is .50 CFM (high speed), and maximum pressure is 30 PSIG.

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Orientation Sensor

Bosch Sensortec (Palo Alto, CA) offers the BMX055 9-axis sensor that contains three 3-axis sensors: a 12-bit low-noise accelerometer; a gyroscope with a resolution of 16 bits and programmable measurement ranges; and a low-noise, widerange geomagnetic sensor. The sensor uses proprietary MEMS sensor technologies. The FusionLib Software combines the sensor data outputs and generates virtual sensor outputs such as quaternion, linear acceleration, rotation, and gravity.

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