Eddy Current Brake Dynamometer — High-Speed Motor Testing up to 50,000 RPM

An eddy current dynamometer is a non-contact load device that generates braking torque through electromagnetic induction. As the conductive rotor spins inside a magnetic field, opposing eddy currents create a precise, controllable braking force. Load is adjusted by changing the excitation current through external coils. No mechanical contact means minimal wear and highly repeatable measurements.

EconoTest ECW series eddy current dynamometers cover speeds up to 50,000 RPM. The ECW05KB model (0.5 Nm) reaches 50,000 RPM for high-speed micro-motor testing; the ECW300KB model (300 Nm) handles speeds up to 7,000 RPM for large industrial motors. All models are water-cooled.

Não. Eddy current dynamometers cannot generate braking torque at zero RPM because the braking force depends entirely on rotor motion through the magnetic field. For zero-speed torque testing, starting torque measurement, or servo motor evaluation, a hysteresis or magnetic powder dynamometer is required.

All ECW series eddy current dynamometers are water-cooled. Short-term power ratings range from 200 C (ECW05KB) para 25,000 C (ECW300KB); continuous ratings from 120 W to 15,000 C. Water supply flow and pressure requirements are specified per model. The water circuit must be kept clean to maintain heat exchange efficiency.

ECW series eddy current dynamometers achieve torque accuracy of ±0.2% to ±0.5% full scale. The exact accuracy depends on the model and measurement range selected. Load cell-based torque measurement with non-contact speed pickup ensures consistent repeatability across test sessions.

Eddy current dynamometers excel at: high-speed electric motor performance testing, EV motor power and efficiency mapping, combustion engine development and calibration, quality control and endurance testing for motors up to 300 Nm, NVH testing, and high-speed component testing where low rotor inertia is important.

EconoTest ECW series: ECW05KB (0.5 Nm / 50,000 RPM), ECW1KB (1 Nm / 40,000 RPM), ECW2KB (2 Nm / 40,000 RPM), ECW5KB (5 Nm / 25,000 RPM), ECW10KB (10 Nm / 20,000 RPM), ECW20KB (20 Nm / 15,000 RPM), ECW30KB (30 Nm / 15,000 RPM), ECW50KB (50 Nm / 12,000 RPM), ECW100KB (100 Nm / 10,000 RPM), ECW200KB (200 Nm / 8,000 RPM), ECW300KB (300 Nm / 7,000 RPM). All water-cooled. Custom configurations available.

Corrente parasita: best for high-speed testing (até 50,000 RPM), cannot produce torque at zero speed, water-cooled, good accuracy. Histerese: full torque from zero RPM, ideal for precision servo and BLDC testing, até 30,000 RPM, lower power capacity (max 30 Nm). Pó magnético: torque total em velocidade zero, best for low-to-medium speed production testing (2,000–5.000 RPM), highest torque range (até 2,000 Nm), heat-limited at high speeds. See our full comparison guide for selection help.