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When You May Not Want to Use a Brushless Motor With Integrated Commutation Electronics

November 26, 2012 0 Comments

Points to consider in brushless motors with integrated commutation electronics

In an earlier post, I briefly described the features and benefits of brushless motors with integrated commutation electronics. Then I pointed out how easy it is to wire such a brushless motor compared to using separate components. However, now I want to outline some of the application characteristics that may indicate you should use separate, rather than integral, commutation electronics.

When Motor Length is Critical

In some cases, the integrated commutation electronics add no more length to the brushless motor, as with the Dunkermotor BG 3 2KI and BG 42 KI motors. But in others, like the Dunkermotor BG 65×50 KI the length is increased 15% to 115mm for the integrated commutation electronics compared to the standard length of 100mm. Therefore, if your design is critical in terms of the length that may be allowable for the motor you might be just fine in the smaller diameter brushless motors, but be aware that the length will increase with the larger units and, therefore, you may require a separate control board. Which brings us to the next consideration.

When You’re Already Including Other Control Boards

If the equipment you are designing requires other control boards and you are comfortable enough designing and building your own commutation electronics then they can often be included at modest incremental cost if board space allows. Of course, you’ll also want to take into consideration the distance between control and motor as well as the cabling and connector costs that would go along with that.

When Environmental Conditions May Be Extreme

If the motor is going to be used in a particularly dirty or wet environment or if high ambient temperatures indicate that a separate protective enclosure may be required for electronics you should be careful if you’re planning to apply brushless motors with integrated commutation electronics. In the smaller 32 and42mm sizes if may not be practical. However, in the larger sizes it is possible to have the motors built to provide IP65 protection and possibly even greater. That is done by Dunkermotor often for application in solar tracking and various mobile uses.

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About the Author:

John Morehead is an experienced marketing, sales and business development leader. He’s passionate about motion control and advanced motor technology and shares that enthusiastically with those he encounters and many more through his myriad marketing initiatives. This blog is one more tool to be able to spread the word about news, information and insights on the motion control, electric motors, drives and automation fields. Your comments or questions on posts are welcome.

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