ToolsArmenia Knowledge BaseMotor Types: Differences Between Brushed and Brushless Motors Brushed and brushless motors differ in more than the presence of carbon brushes. They also differ in commutation, energy efficiency, heat generation, maintenance, price, and the role of electronics. The right choice depends on workload, operating time, and the complete tool system. Reading time: about 15 minutesUpdated: July 2026ToolsArmenia Editorial Team Contents The role of the motor Brushed motor Brushless motor Power, efficiency, and control Motor comparison Which type to choose 6 selection steps Common mistakes Frequently asked questions What role does the motor play in a handheld power tool? The motor converts electrical energy into mechanical rotation. However, actual tool performance is not determined by the motor alone. Torque, speed, speed retention under load, and operating time are influenced by the motor, electronic controller, battery or power supply, cooling system, gearbox, and accessory. Brushed and brushless motors are common in handheld power tools. Cordless tools generally use brushed DC motors or electronically commutated brushless motors. Many corded tools use a universal motor with brushes and a commutator that can operate from an AC supply. Key principleThe Brushless label describes the motor construction. It does not automatically prove that a particular tool is more powerful, faster, or more durable than every comparable brushed model. Compare the specifications and duty class of the complete tool. What is a brushed motor? In a brushed motor, carbon brushes transfer current through sliding contact to a rotating commutator. The commutator changes the direction of current through the windings in sequence, enabling continuous rotor rotation. It is a long-established, well-understood, and comparatively simple design. AdvantagesUsually a lower purchase price, simpler control circuitry, widely available parts, and comparatively straightforward repair on some models. It can be suitable for occasional and moderately demanding work. Wear componentsThe brushes wear gradually and may require inspection or replacement. The commutator surface also wears, particularly when exposed to dust, overheating, or unsuitable loading. Heat and lossesBrush friction and electrical commutation create additional losses, heat, and sparking. Cooling airflow may also draw abrasive or construction dust into the tool. Practical useA well-designed brushed tool can provide long and effective service when matched to the workload, its air vents are kept clean, and its brushes and commutator are maintained at the correct intervals. Sparking is not always a faultSmall, even sparking may be a normal consequence of brushed-motor operation. Heavy, circular, or irregular sparking, a burning smell, loss of power, or unusual noise requires the tool to be stopped and inspected. What is a brushless motor? In a brushless motor, mechanical brush-and-commutator switching is replaced by electronic control. Using rotor-position information or calculated signals, the controller energises the stator windings in sequence to create a rotating magnetic field. The benefit of eliminating brushes Because there is no brush friction or brush wear, the related energy losses, heat, and maintenance requirement are reduced. The motor can be more compact, and battery energy can be used more efficiently. Actual results depend on the design of the motor, controller, cooling system, and battery. Electronic control The controller may adjust torque and speed to suit the load, limit current, monitor temperature, and work with braking or protection systems. However, more complex electronics can increase both the tool price and repair cost. Performance under load A well-designed brushless system often uses battery energy more efficiently and may maintain working performance more consistently. Any advantage in torque or power should be confirmed through the specifications and testing of the exact model, not inferred from the motor name alone. Not maintenance-freeA brushless motor has no carbon brushes to replace, but the tool still contains bearings, a gearbox, cooling passages, switches, and electronic components that can wear or require maintenance. Power, energy efficiency, and control Efficiency and cordless runtime A brushless system usually reduces losses caused by brush friction and mechanical commutation. On the same battery platform, this may provide longer runtime per charge, less heat, or greater working output from a similar size. The percentage improvement is not fixed and depends on the tool, operating mode, and battery. Rated and actual power The wattage shown on a corded tool normally refers to input power and is not directly equal to useful output power. On a cordless tool, voltage alone does not define actual motor power either. Compare torque, speed, accessory limits, and intended duty class. Thermal limitations An efficient motor generally produces less waste heat, but high current, obstructed air vents, a hot battery, or prolonged overload can also overheat a brushless tool. Thermal protection is not permission to overload a tool continuously. Precise control Electronic commutation makes speed selection, constant-speed control, electric braking, and programmable operating modes easier to implement. These are model-specific features: a Brushless label does not mean that every one of them is necessarily included. Comparison of brushed and brushless motors CriterionBrushed motorBrushless motorWhat to check CommutationMechanical, using brushes and a commutator.Performed by an electronic controller.Motor type and manufacturer description. MaintenanceBrushes wear and are replaced; the commutator is inspected.No brush servicing, but other components remain.Availability of service and spare parts. Energy efficiencyGreater friction and commutation losses.Usually more efficient, especially in cordless tools.Actual runtime with the same battery. HeatBrush friction creates additional heat.Often operates more efficiently but still heats under load.Cooling and permitted duty cycle. Size and weightMay be longer or heavier within the same class.Can permit a more compact design.Actual dimensions and ready-to-use tool weight. ControlSimple and reliable control is possible.Allows flexible electronic control.Speed modes and behaviour under load. Price and repairUsually more affordable and sometimes simpler to repair.Usually more expensive; electronics can complicate repair.Warranty, service centre, and parts cost. Best suited toOccasional, short-duration, or budget-conscious work.Frequent, prolonged, or efficiency-focused work.Daily workload and cost of downtime. Which motor should you choose for different jobs? For home and occasional use, a quality brushed tool may be an economical and fully adequate choice.For daily professional work, the efficiency, compactness, and lack of brush servicing in a brushless system often justify the higher purchase price.For extended cordless work, compare not only the motor but also battery capacity, current capability, thermal management, and charging speed.For dusty environments, examine housing and electronics protection. The absence of brushes does not mean the entire tool is sealed against dust.For high-torque work, check the model's N·m rating, gearbox stages, and safety clutch.When choosing a corded tool, a Brushless label is not the only deciding factor. A professional universal brushed motor can perform a demanding application effectively.For remote work or costly downtime, consider the availability of service centres, electronic modules, and spare parts. Practical selectionIf two tools in the same class can complete your work, evaluate the brushless price premium through expected runtime, battery efficiency, compactness, and reduced maintenance—not the label alone. 6 steps for choosing a motor type 1Define the workloadIdentify the material, accessory size, duration of continuous work, and frequency of daily use. 2Select the required tool classFirst compare tools intended for the same application and duty class, then assess their motor technology. 3Compare actual specificationsCheck torque, speed, accessory limits, performance under load, and protection systems. 4Evaluate the complete power systemFor a cordless tool, compare the battery platform, capacity, current capability, charger, and thermal management. 5Calculate ownership costInclude the purchase price, batteries, possible brush replacement, repairs, downtime, and service availability. 6Choose according to practical valueSelect brushless when its efficiency, compactness, or control features provide a meaningful benefit for your work. Common mistakes when choosing a motor type Assuming every brushless tool is automatically more powerful than every brushed model.Comparing tools of different classes, voltages, or purposes by motor label alone.Treating battery voltage as a complete measure of motor power.Ignoring battery capacity, current capability, and thermal limitations.Assuming a brushless tool is entirely maintenance-free.Treating any small spark in a brushed motor as a fault or, conversely, ignoring severe sparking.Buying an expensive brushless model for rare use without evaluating the practical benefit of the premium.Choosing only by the highest N·m or RPM value without checking the gearbox, control, and accessory compatibility.Ignoring service-centre and electronic spare-part availability.Comparing two models with different batteries or in different operating modes. Frequently asked questions Is a brushless motor always more powerful?No. It is usually more efficient, but actual tool power depends on the motor, controller, battery or power supply, cooling, and gearbox. Compare the real specifications of models in the same class. Does a brushless motor require no maintenance?It does not require carbon-brush replacement, but bearings, the gearbox, cooling passages, switches, and electronics still require inspection and maintenance. Does a brushless tool run longer on one charge?Often yes, because brush-friction losses are removed and the electronics can manage energy more efficiently. The actual difference depends on the application, battery, and design of both tools. Is a brushed tool a poor choice?No. A quality brushed tool can be a reliable and economical choice for occasional, short-duration, or moderately demanding work. How can I tell when the brushes are worn?Possible signs include heavy or irregular sparking, loss of power, intermittent operation, a burning smell, or unusual noise. Inspect and replace them according to the manufacturer or through an authorised service centre. Does a brushless motor produce no sparks at all?It has no brush-to-commutator sparking, but switches and other electrical components have their own limitations. Do not use the tool in a flammable or explosive atmosphere unless specifically certified for it. Is brushless essential for a corded tool?No. Many professional corded tools work effectively with universal brushed motors. Choose according to the task, power, duty cycle, weight, and maintenance requirements. Is a brushless model worth the extra cost?It can be when frequent use allows longer runtime, compactness, energy efficiency, or the absence of brush servicing to offset the price premium. Read alsoHow to choose handheld power tools.What is tool power (W).What is torque (N·m).What is rotational speed (RPM).Power tool safety systems and what they do.Related categoriesCordless screwdrivers and drill drivers.Cordless drills.Cordless angle grinders.Corded power tools.Batteries and chargers.Power tool spare parts. Next article: Differences between professional and household tools.
AdvantagesUsually a lower purchase price, simpler control circuitry, widely available parts, and comparatively straightforward repair on some models. It can be suitable for occasional and moderately demanding work.
Wear componentsThe brushes wear gradually and may require inspection or replacement. The commutator surface also wears, particularly when exposed to dust, overheating, or unsuitable loading.
Heat and lossesBrush friction and electrical commutation create additional losses, heat, and sparking. Cooling airflow may also draw abrasive or construction dust into the tool.
Practical useA well-designed brushed tool can provide long and effective service when matched to the workload, its air vents are kept clean, and its brushes and commutator are maintained at the correct intervals.
