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Packaging World     VP/Editor, Pat Reynolds
SPONSOR: Rexroth Bosch Group November 18, 2011 | Edited by Pat Reynolds

7 tips on servo motor control topologies

Discussed in a new white paper are functional and economic factors to be considered in choosing integral control and fieldbus-enabled brushless servo motors.

Brushless servo motors with integrated motion control electronics continue to expand into new packaging machinery, factory automation, and specialty machine applications based on their ease of installation, compact size, and the reduction in cost compared to separate drives, connectors, and cabling. Cost-conscious OEMs, however, will benefit from not specifying and purchasing more control features and functionality than their applications require. A new White Paper from Dunkermotor identifies and discusses seven distinct integral control topologies to enable OEM design engineers to choose what suits their application without over-specifying.

Today's technology brings servo manufacturers many options when it comes to designing their motor drives and controls. "With all the different possible functions that can be implemented in a servo drive, many manufacturers are tempted to pack them all into one 'full-featured' product," said Jay Becker, senior applications engineer for Dunkermotor. "This can be a problem, however, for the OEM when it comes time to select the right one for their application."

In the case of the end-user or custom machine builder, they may prefer to have a "does-everything" drive that they can use in all of their applications, most of which can be different from one to the next. Packaging machinery OEMs, on the other hand, cannot afford unnecessary features and hardware if they are to remain market competitive. Therefore, the OEM requires a servo drive with features that are tailored to the application at a price tailored according to those features.

The Dunkermotor White Paper discusses seven different levels of capability of integrated servo motor and drive combinations, ranging from simple integrated commutation electronics to fieldbus distributed control arrangements, such as CANopen, Profibus and EtherCAT, all the way to motors with integrated master electronics that require no higher-level controller, are freely programmable, and can also control slave node motors.

Servo motors with integrated electronics increase reliability due to the close proximity of the drive/control electronics to the motor itself, virtually eliminating the possibility of interference from the outside world. Having the electronics inside the motor also dramatically reduces the panel space for a given machine, saving cost in materials as well as time in wiring.

The new White Paper, titled "Why Pay for More Than You Need?" may be downloaded from the Dunkermotor website at www.dunkermotor.com/whitepaper/whypaymore

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Light and flexible, the DHDG adaptive gripper from Festo consists of a pneumatic actuator in the form of a bellows and three gripper fingers arranged in the pattern of the tail fin of a fish ... Read more

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With the ability to independently detect clear shrink wrap film, PET plastic bottles, glass and other transparent objects without a background, Pepperl+Fuchs' ML100-8-W divergent beam sensors eliminate the time, cost and machine space associated with installing reflectors ... Read more

High-intensity LED spot lights for general purpose, task lighting

Banner Engineering's WL50S High-Intensity LED Spot Light, an extremely bright, sealed spotlight designed for use in general purpose applications, provides a long-lasting useful life when used within its specifications ... Read more

Ethernet field wireable connector features bayonet-style mating for harsh environments

The IP 67 Bayonet Style RJ45/Ethernet field wireable connector from Turck, an extension their RJ45 connector line, provides protection in washdown applications or in areas of high impact ... Read more

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