Twist-Tie Packaging Machine

July 15, 2011

This is a custom designed Brushless DC motor that is used on a commercial bakery packaging machine to twist-tie plastic bag closures. It uses a flux ring to achieve hall effect type commutation, without the use of a magnet.

Brushless DC motor, high performance, high torqueDesign Significance

Typical DC Brushless motor designs use a separate hall effect magnet and hall effect devices to provide positional feedback to the control. This magnet must be aligned with the main rotor magnet in positioning applications. The control then switches the coils appropriately to provide rotation of the motor.

This unique design incorporates a steel flux ring to provide accurate positioning, which eliminates the need for a separate hall effect magnet. In this case, the hall effect devices are placed in close proximity to the outer diameter of the flux ring, and use the rotor flux commutator. With no hall effect magnet, it eliminates the inherent problems related to accuracy of magnet positioning and magnetization.

Due to the flux path from the rotor magnet to the flux ring, the magnet transition points are always properly aligned to the rotor. Proper alignment ensures no errors in commutation timing due to any inaccuracies in the manufacture of the motor.

Design Innovations

Instead of a hall effect magnet, this Brushless DC motor uses an easily fabricated steel ring as a flux sink to capture the rotor magnet flux which in turn provides accurate positional feedback for commutation. This is a highly cost-effective solution with a more compact design, which greatly improves the ability to manufacture the design.


How to use the Motor Search Tool

Narrow your search by selecting motor type, gearbox, voltage, and phase options for your desired motor.

Select a dominant variable: choose one of the three parameters to narrow your search. The selected variable determines which slider bar you will be able to manually move.

Use the slider corresponding to your dominant variable to further narrow your motor selection. The other sliders will automatically move to show available ranges based on the range of your selected variable.

Results will upload as your search criteria changes. If you have any questions regarding your results or how to use the search tool, you can chat with us using the green tab on the left-hand side of your screen.

Note: Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Selecting the Universal motor type will prompt a message taking you to the Universal product page.

Not sure what you need?

One of our team members would be happy to help. Contact us at 800-829-4135 or by email at sales@groschopp.com. You can also chat with us using the green tab on the left side of your screen.

send us an email

Universal Motors

Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Standard frame sizes and motor features can be found on the Universal page.

go to Universal page