EP-40W Output Power DC Motor
The EP-40W is a brushed permanent magnet dc motor designed around the K5D40 frame, a well-proven platform in the light industrial segment. With an output power rating of exactly 40 watts, it occupies the practical sweet spot between underpowered micro motors and bulkier fractional-horsepower units that demand heavier mounting structures.
No-load speeds range from 3,000 RPM (24V model) to 3,200 RPM (90V model), while full-load operating speeds settle between 2,800 and 3,000 RPM — a tight regulation band that simplifies downstream control architecture.
The motor lead cable is 300 mm long as standard, pre-fitted for panel routing. The wiring configuration follows the universal CW/CCW convention: red lead to positive for clockwise rotation, black lead for the return path.
EP Series | 40W Output Power
EP-40W DC Motor
Precision-engineered for demanding industrial and automation environments, the EP-40W dc motor delivers reliable performance across a broad voltage range. Available in 12V, 24V, and 90V configurations, this compact brushed motor combines consistent torque output with extended brush life — making it the go-to choice for OEM integrators, machine builders, and engineers seeking a dependable high torque dc motor with predictable speed control.
Motor Performance Parameters
The table below details the rated performance data for all three EP-40W dc motor voltage variants. All values are measured under standard ambient conditions (20°C, sea level).
| Model | Voltage (V) | Power (W) | No-load | Full Load | Brush Life (H) | Weight (kg) | |||
|---|---|---|---|---|---|---|---|---|---|
| Speed (RPM) | Current (A) | Speed (RPM) | Torque (kg·cm) | Current (A) | |||||
| K5D40-12□ | 12 | 40 | 3100 | 2.0 | 2800 | 1.4 | 5.2 | 3000 | 1.9 |
| K5D40-24□ | 24 | 40 | 3000 | 0.8 | 2800 | 1.4 | 2.2 | 3000 | 1.9 |
| K5D40-90□ | 90 | 40 | 3200 | 0.3 | 3000 | 1.3 | 0.7 | 3000 | 1.9 |
□ suffix denotes shaft output type. Refer to bare motor output shaft dimension table below.
Compatible Gearbox Dimensions
The EP-40W interfaces directly with the 5GN gearbox series. Three gearbox frame sizes are available, each with a standardised L-dimension and defined weight. The gearbox bolts directly to the motor's 90×90 mm flange, secured by four M6 bolts (or 4×ø6.5 through holes depending on variant), eliminating the need for adaptor plates.
| Gearbox Model | Reduction Ratio | L Dimension (mm) | Weight (kg) |
|---|---|---|---|
| 5GN3K – GN18K | 3 – 18 | 42 | 0.73 |
| 5GN20K – GN36K | 20 – 36 | 60 | 1.03 |
| 5GN40K – GN200K | 40 – 200 | 60 | 1.13 |
Allowable Torque on Gearbox — 4GN□K Series
The following allowable torque data applies to the K2D10-24□ model when paired with the 4GN□K gearbox family. Output shaft speeds and permissible torque values are listed across the full reduction ratio range.
| Model | Parameter | 3 | 3.6 | 5 | 6 | 7.5 | 9 | 10 | 12.5 | 15 | 18 | 20 | 25 | 30 | 36 | 40 | 50 | 60 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| K2D10-24□ | Output (r/min) | 1000 | 833 | 600 | 500 | 400 | 333 | 300 | 240 | 200 | 166 | 155 | 124 | 103 | 86 | 78 | 62 | 52 |
| Torque (N·m) | 0.31 | 0.37 | 0.62 | 0.62 | 0.77 | 0.93 | 1.03 | 1.29 | 1.55 | 1.86 | 1.86 | 2.32 | 2.79 | 3.35 | 3.36 | 4.20 | 5.04 | |
| Torque (kgf·cm) | 3.20 | 3.80 | 6.30 | 6.30 | 7.90 | 9.50 | 10.50 | 13.20 | 15.80 | 19.00 | 19.00 | 23.71 | 28.46 | 34.15 | 34.30 | 44.23 | 51.45 |
Bare Motor Output Shaft Options
| Shaft Type | Gear Shaft | Flat Type | Milled Keyway |
|---|---|---|---|
| Model Code | DC5GN40-□ | DC5A40-□ | DC5A140-□ |
| Suitable For | Gearbox coupling | Pulley / pinion drive | Keyed coupling / sprocket |
Five Key Advantages of the EP-40W DC Motor
① Multi-Voltage Flexibility
The EP-40W is available in 12V, 24V, and 90V variants, allowing seamless integration into battery-powered systems, standard DC supplies, or industrial DC bus networks without requiring external voltage converters.
② Consistent Torque at Load
Rated at 1.3–1.4 kg·cm under full load across all voltage models, this permanent magnet dc motor maintains stable torque without the performance dips typical in lower-grade units — vital for conveyor systems, packaging lines, and medical instruments.
③ Extended Brush Life — 3,000 Hours
Factory-rated brush life of 3,000 hours minimises maintenance intervals in continuous-duty applications. The carbon brush geometry is optimised for low sparking, reducing electrical noise that can interfere with sensitive control electronics or dc motor drive systems.
④ Compact, Lightweight Build
At just 1.9 kg, the EP-40W slots into space-restricted enclosures. The 90×90 mm face-mount flange and standardised shaft options — gear shaft (DC5GN40), flat type (DC5A40), and milled keyway (DC5A140) — reduce custom coupling costs and cut assembly time significantly.
⑤ Gearbox-Ready Design
Direct compatibility with the 4GN and 2GN gearbox series (reduction ratios from 3:1 to 200:1) means the EP-40W can be transformed into a high torque electric motor assembly in minutes, covering output speeds from under 20 r/min to over 1,000 r/min for diverse drive requirements.
DC Motor Working Principle
Understanding the dc motor working principle helps engineers select the right operating point and predict performance under real-world load conditions. The EP-40W operates on Faraday's law of electromagnetic induction: a current-carrying conductor placed within a permanent magnetic field experiences a mechanical force. In a brushed dc electric motor, this force is harnessed to produce continuous rotation.
Inside the EP-40W, a wound armature rotates between two permanent magnets mounted in the stator housing. Carbon brushes press against a segmented copper commutator on the armature shaft, switching current direction through the windings in precise synchrony with rotor position. This self-commutating action is the defining characteristic of a brushed motor — no external electronic commutation circuit is required, unlike a brushless dc motor (BLDC motor) or a dc servo motor, where rotor position feedback drives an external drive stage.
The back-EMF generated as the armature accelerates provides inherent speed regulation: as load increases, back-EMF decreases, allowing more current to flow and torque to rise automatically — up to the motor's rated limits. This behaviour makes the EP-40W particularly forgiving in variable-load applications, such as feed mechanisms and positioning stages, where instantaneous torque demand fluctuates.
Compared to a dc stepper motor, which moves in discrete angular increments, the EP-40W delivers smooth, continuous rotation well suited to constant-speed drive tasks. Compared to a bldc motor, it requires no controller complexity for basic operation, reducing system BOM cost while still offering the speed-torque flexibility engineers expect from premium dc electric motors.
Materials & Build Quality
The EP-40W dc motor housing is cold-rolled steel, powder-coated for corrosion resistance in workshop and light outdoor enclosure environments. The stator employs high-energy sintered permanent magnets that retain their magnetic flux over the full rated service life — an important distinction from ceramic-ferrite motors, which can suffer flux loss at elevated operating temperatures above 80°C.
The armature core is laminated silicon steel, a material choice that dramatically cuts eddy-current losses at operating speeds above 2,800 RPM. Each lamination layer is coated with an insulating varnish before stacking and pressing — a manufacturing step that separates precision-grade motors from budget alternatives. The winding wire is enamelled copper with a Class B (130°C) thermal rating, providing adequate margin above the motor's normal operating temperature rise of 40–50 K.
Bearings at both shaft ends are pre-greased, sealed deep-groove ball bearings, selected for low-friction operation and minimal maintenance over the motor's rated brush life. The commutator is CNC-ground copper, ensuring contact surface uniformity that extends brush life and keeps commutation noise below the thresholds of most motion-control electronics. All materials comply with RoHS directives, supporting export compliance across EU, Australian, and North American markets.
Application Scenarios
The EP-40W dc motor is a versatile platform. Below are the core application segments where the motor delivers proven, repeatable performance.
🏭 Industrial Automation
Conveyor belt drives, rotary indexing tables, and pick-and-place actuators in manufacturing lines rely on the EP-40W's stable torque curve. The motor's low-inertia armature allows fast start-stop cycles without thermal accumulation, making it suitable for packaging machinery and labelling equipment operating at high cycle rates.
🌾 Agricultural Machinery
Precision seed dispensers, irrigation control valves, and grain auger drives often specify a small dc motor in the 24V range to match tractor electrical systems. The EP-40W's 24V variant delivers exactly this, with a 2,800 RPM rated speed that pairs efficiently with step-down gearboxes for low-speed, high-torque final drive duties.
🏥 Medical & Laboratory
Diagnostic instruments, sample carousel drives, and infusion pump mechanisms need a quiet, precise motion source. The EP-40W's smooth commutation and compact 90×90 mm footprint fit into instrument housings where vibration and acoustic noise must stay below clinical thresholds. Its low no-load current draw also extends battery life in portable devices.
🖨️ Office & Printing Equipment
Industrial printers, document feeders, and currency-handling machines use dc motors to drive paper transport rollers at controlled speeds. The EP-40W's tight speed regulation under variable media friction loads keeps print registration accurate, reducing reject rates on high-volume production print lines.
🔧 Test & Measurement Rigs
Load simulation platforms, environmental test chambers, and torque calibration benches benefit from the EP-40W's predictable speed-torque characteristic. Engineers building custom test fixtures can drive the motor from a standard bench power supply or PWM controller, dialing in exact load conditions with no specialised driver hardware required.
🚗 Light EV & Mobility Aids
Wheelchair actuators, mobility scooter ancillary drives, and small electric vehicle accessory systems (mirror tilt, seat adjustment) often use a 12V or 24V dc electric motor in this power class. The EP-40W's 3,000-hour brush life comfortably exceeds the expected duty cycle for intermittent-use actuator applications.
About Our Manufacturing Operation
With over ten years of accumulated experience in mechanical power transmission, our production facility specialises in dc motor assemblies, gearbox systems, and drive components for global industrial markets. Our engineering team holds deep working knowledge of motor-drive integration — from brushed dc electric motors to complex multi-stage reducer assemblies — and brings that expertise directly to each custom project.
Our product portfolio spans agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, gears, chains, and motors. The facility operates under ISO 9001:2015 quality management certification, ensuring consistent process control from raw material intake through final outgoing inspection. We manufacture a broad range of industrial and agricultural gearboxes and assemblies using ductile iron, cast iron, cast steel, precision cast steel, and cast aluminium, alongside gears, sprockets, worm gears, pulleys, worm shafts, and both standard and non-standard mechanical transmission parts tailored to client specifications.
Workshop
Related Products — Complete Drive Systems
The EP-40W dc motor is engineered to work alongside our full lineup of drive and reduction components, giving machine builders a single-source solution for complete electromechanical drive trains. System compatibility and consistent engineering standards across product families reduce integration risk and simplify procurement.
Our full range of Motor Elektrik covers AC single-phase, AC three-phase, and multiple DC motor types for diverse industrial voltage requirements. Pairing an EP-40W with a compatible electric motor from our portfolio enables modular drive configurations, with the reassurance that all components share engineering tolerances and flange standards verified at our facility.
Our Kotak Gear Cacing series is a natural complement to the EP-40W, providing self-locking reduction ratios from 5:1 to 100:1 in a compact right-angle housing. When combined with a high torque dc motor like the EP-40W, the worm reducer delivers the high output torque and position-holding capability required in gate actuators, conveyor gate lifts, and valve drive assemblies.
Frequently Asked Questions
Editor: PXY
