How Brushed vs. Brushless Motors Work
Traditional Brushed Motors
In a traditional electric motor, spring-loaded carbon brushes physically press against a rotating copper commutator ring to transfer current to the motor armature.
- The Drawback: This constant physical friction creates sparks, generates significant internal heat, and wastes battery energy as wasted thermal dissipation. Over time, the carbon brushes wear down and must be replaced.
Electronically Commutated Brushless Motors
A brushless motor turns the design inside out: permanent neodymium magnets are mounted directly on the spinning rotor shaft, while stationary copper electromagnets surround the perimeter.
- A micro-controller chip (like Milwaukee’s REDLINK or DEWALT’s XR intelligent electronics) precisely fires electrical pulses to the coils in sequence.
- The Result: Zero friction, zero carbon dust, minimal heat buildup, and vastly superior energy efficiency.
4 Tangible Workshop Advantages of Brushless Jigsaws
1. Smart Constant-Speed Electronics
When a brushed jigsaw hits a dense wood knot, the motor immediately bogs down, drops RPMs, and often binds.
- Brushless controllers actively monitor motor amperage thousands of times per second. When resistance increases, the electronic brain automatically feeds additional battery current to maintain your set SPM speed without hesitation.
2. 50% More Cuts Per Battery Charge
Because energy isn’t wasted fighting brush friction and shedding excess heat, you extract far more cuts out of standard 4.0 Ah and 5.0 Ah battery packs. A brushless tool like the DEWALT DCS334B or Makita XVJ02Z can easily cut through dozens of sink openings on a single charge.
3. Compact Tool Ergonomics & Barrel Grips
Without bulky carbon brush assemblies, motor housings can be engineered significantly smaller. This breakthrough made ergonomic barrel-grip jigsaws (like the DEWALT DCS335B and Milwaukee 2737B-20) viable, allowing your hand to sit inches closer to the workpiece for unprecedented scroll control.
4. Extended Tool Lifespan
Carbon dust from wearing brushes is conductive; over years of workshop use, dust accumulation inside the motor casing can cause short circuits. Brushless motors feature sealed stator housings that are virtually immune to sawdust intrusion.
Conclusion: Should You Upgrade?
- Occasional Weekend DIYers: A budget-friendly brushed cordless saw (like the RYOBI P5231 or BLACK+DECKER BDCJS20C) handles household pine cuts just fine.
- Woodworkers, Remodelers & Pros: Upgrade to brushless without hesitation. The smooth soft-start triggers, constant speed under load, and extended battery runtimes make brushless jigsaws the undisputed choice.
Review top brushless models in our Complete US Jigsaws Catalog and browse compatible battery platforms in our US Batteries Guide.