Dynamometer Load & Transformer Sizing

Dynamometer Bounding Factors

• Maximum Current Supply: Sets the peak low-speed electromagnetic torque.
• Shaft & Coupler Limits: Maximum allowable mechanical torque before risk of mechanical shear.
• Maximum Heat Rejection: Power absorbed must be safely dissipated to avoid thermal insulation damage.
• Maximum Rotational Speed: Safe RPM ceiling for rotor inertia and bearings.
• Minimum Frictional Load: Parasitic friction from bearings and windage.

Power Supply & Transformer Sizing

Most Eddy current dynos have internal coil resistance between 5 and 50 ohms requiring 5 to 10 amps at full load. Correct current rating ensures fine PID resolution without current saturation or excessive heat.