Bosch EC Motors - a Toolstop Guide Understanding How They Work

Power tool innovation isn't just limited to new batteries, we're increasingly seeing the manufacturers of professional power tools tweak, refine and improve the inner workings of the tools.

One instance of that is to found in some Bosch professional power tools such as the GBH 18V-EC 18V Li-ion SDS Plus cordless rotary hammer drill.

Yes, it's packing new batteries, Bosch's CoolPacks, providing you 4Ah of charge.

But's its under the covers that we see some great innovation, Bosch is calling it Electronically Commutated motors, or EC for short (conveniently).

How does an Electronically Commutated Motor Work?

First off, look for the "EC" sticker on your Bosch power tools, however - as stated - it's what Bosch has put inside that matters.

Bosch describe these "EC" motors as being like standard brush motors, but turned inside-out. In reality, these motors are brush-less, and as a result run much more efficiently (roughly 90% more power-efficient), drawing less power from the battery.

And because the motor has no brushes, it's much more shock-resistant. This is great for a cordless power tool, given the mobility of these tools.

The absence of brushes means that the computation of power drawn through the motor is handled by an electronic module within the tool. Again, this directly relates to greater efficiency from your power tool; longer run-times, less time on the charger, etc.

Watch Bosch's Eric Streuli explain and demostrate EC motors on Toolstop TV, click here.

In Plain English, What Does This Mean for You?

Quite simply greater efficiency. Longer run-times (in part thanks to the higher capacity - 4Ah - batteries) means more holes drilled.

And who can argue with that?

If you've got any comments or questions about power tool technology, get in touch with us using the comments box below.

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Aleksandar on Thu, 08 Aug 2013 13:49:14 +0100 (Likes: 0 / Dislikes: 0

There is a mistake above. It is not "roughly 90% more power-efficient". Efficiency is ~90% versus ~70% on the ones with brushes...

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