Spotlight on Motors and Motion Control

Miniature encoder

The compact ATOM noncontact optical linear and rotary incremental encoder system from Renishaw offer dirt immunity, signal stability, and reliability. With a readhead as small as 6.7 x 12.7 x 20.5 mm, ATOM is said to be the smallest available miniature encoder to use filtering optics with auto gain control and auto offset control. These functions help boost signal stability and dirt immunity. The encoder can be used for scanning, precision micro stages, medical device applications, microscopy, scientific research, as well as for various motion control, inspection, and metrology applications. ATOM offers analog speeds to 20 m/s (29,000 RPM on a 17 mm disc) and digital resolutions to 1 nm when used with the firm’s interpolation electronics. The readhead includes a set-up LED to allow quick and easy installation, and an auto-calibration routine to enable faster optimization. Scale options include linear and rotary (angle) scales in stainless steel and glass
Renishaw, Inc.    
Hoffman Estates, IL
www.renishaw.com

Right-angle gearheads

Right-angle gearheads from Maxon are designed to be configured with the company’s 22- and 32-mm dc motors.  These compact, lightweight, and high torque gearheads were developed to transmit power at 90 ° in a small form factor. The company’s proprietary Spiroid technology incorporated in the gearhead design offers a number of performance benefits, including high torque transmission, high stiffness, quiet operation, and low backlash. The 22- and 32-mm right angle gearheads are available in either a 4:1 or 31:1 ratio, which may be mounted directly onto many of the company’s brushed/brushless motors or configured with different ratios of its GP22 and GP32 planetary gearheads.
Maxon Precision Motors
Fall River, MA
www.maxonmotorusa.com
 

Brushless dc motor

The 3274 BP4 brushless DC servo motor, measuring 32 mm in diameter and 74 mm in length, has a continuous torque of 165 mN•m.  The motor, which weighs less than 320 g, is said to weigh half as much as conventional motors with comparable power. The four‐pole brushless dc servo motor is suited for applications in which high power and dynamic start and stop operation is required. Examples of potential applications include humanoid robots, electric grippers used in process automation, and high‐performance traction drives used in inspection robotics. The 3274 BP4 is overload‐resistant and operates without wear‐prone mechanical commutation. As a result, its operational lifetime is substantially longer than that of a conventional dc micromotor. The slope of the motor characteristic curve is 3 rpm/mN•m,  with a stall torque of 2.7 N•m. High‐resolution optical and magnetic encoders can be attached with ease to the rear multifunction flange.  
MicroMo Electronics Inc.
Clearwater, FL
www.micromo.com

Lead screws

The Kerk Micro series of lead screw assemblies are offered in a standard configurations that include 2-mm diameter screws with leads ranging from 0.3 to 2 mm per revolution and a variety of nut configurations of self-lubricating acetal and Kerkite high-performance composite polymers, including nylon, PPS, and PEEK materials. The product line is available as stand-alone components and can also be integrated into the company’s range of linear actuators. Manufactured with 303 stainless steel, Kerk Micro series of lead screw assemblies are designed to provide high performance and long life. In addition, the screw assemblies require no maintenance.  Optional Kerkote TFE coating, a proprietary dry lubricant, extends nut life while reducing friction and drive torque requirements.
Haydon Kerk
Hollis, NH  
www.haydonkerk.com