Motion Control

Linear Actuators

Parker’s Electromechanical Automation Division (Irwin, PA) released the High Moment Rodless (HMR) electromechanical linear actuator series that features five different frame sizes, two different drive train options, an IP54 protective cover option, and multiple motor mounting, carriage, and sensor options. The actuators integrate externally accessible lubrication fittings into the carriage that evenly disperse lubricant across the bearing trucks and ball nut. Two options for chassis profiles are available: basic or reinforced.

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Rod-Style Actuator

The RSA-HT high-force rod-style actuator from Tolomatic (Hamel, MN) can also be considered as a replacement for hydraulic applications and offers maximum force capabilities of 12,900 lbf (57.38kN). Features include an IP67 option, standard purge/breather port, and a lubrication system. The actuator includes a grease zerk for lubrication without disassembly. The purge/breather port allows positive pressure to be applied to the actuator to help keep contaminants out, and functions as a breather port in high-speed applications where internal pressures may exert additional forces on the actuator if sealed.

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Controller Systems

Velmex (Bloomfield, NY) offers VXM controller systems for power systems that drive motorized products including slides and rotary tables. The controller is a 2-phase, unipolar stepper motor controller that can drive and control precise movements, multi-axis, and velocity. The system is capable of controlling up to four motors, one motor at a time. Two motors can be controlled simultaneously for coordinated motion. Features include an intuitive, comprehensive command instruction set; single-chip microcontroller that digitally controls the motor phase switching and all other interface functions; elimination of noise-sensitive step and direction translation circuitry; and resonance-free motor torque from modulated current control.

Posted in: Articles, Products, Motors & Drives

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Brushless DC Motor and Control

Groschopp (Sioux Center, IA) offers a brushless DC motor and control package consisting of brushless DC motors and gearmotors. The motors feature closed loop controls to deliver commutated power and variable speed control, maintaining speed regulation over a wide range of loads. The motors feature 2,600 to 3,800 RPM, 1.8 to 10.8 in-lb torque, 1/7 to 1/3 HP, and aluminum frames. The controls offer closed-loop speed regulation, line and low voltage, and chassis mount and NEMA 4X enclosures. Available options are a holding brake, foot mount, and IP66 compliance.

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Computation of Wing Deflection and Slope from Measured Strain

Patent-pending methodology computes detailed wing loads during actual flight. Armstrong Flight Research Center, Edwards, California A lightweight, robust fiber-optic system is the technology behind a new method to compute wing deflection and slope from measured strain of an aircraft. This state-of-the-art sensor system is small, easy to install, and fast, and offers the first-ever means of obtaining real-time strain measurements that can accurately determine wing deflection and slope during flight. Such measurements are particularly useful for real-time virtual displays of wing motion, aircraft structural integrity monitoring, active drag reduction, active flexible motion control, and active loads alleviation.

Posted in: Articles, Briefs, Aviation, Measuring Instruments

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Robotic Arm

Global Specialties (Yorba Linda, CA) introduced the R700 Vector Robotic Arm that is fully assembled and ready to be programmed in the C language. The robot comes with pre-written example programs that can be downloaded to the ATMEGA64 microcontroller using the supplied USB interface and RobotLoader software. Custom programs can be written using the free open-source WinAVR software.

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Optical Encoders

Avago Technologies (San Jose, CA) announced the AEDR-87xx series of 3-channel reflective optical encoder devices for use in low-power miniaturized motion control systems such as stepper motors, electrical actuators, piezoelectric drives, and portable medical appliances. The devices feature encoding resolution up to 318 lines per inch (LPI), support for 3.3V and 5V supply voltage for low-power applications, and dual analog outputs interfacing directly with an external interpolator for high-precision motion control measurements. The encoders feature three channel outputs including one index digital output; a built-in interpolator for 4x, 8x, and 16x interpolation; built-in automatic LED current regulation; encoding resolution of 318 LPI (up to 1.25 um pitch); and operating temperature range from -20 to +85 °C.

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