The current drawn by a brushed motor can contain a repeating pattern related to commutation. That pattern can add information beyond a single average-current value.

What to check next

A technician can compare ripple, overall current and supply during the actual symptom. Preserve enough recording to distinguish a repeating feature from a brief disturbance. The motor’s design and operating speed must be understood before converting the pattern into a speed estimate.

Useful information for an enquiry

Send the motor function, operating condition and raw current capture.

Ripple analysis supports diagnosis; it is not a universal pass or fail pattern for every motor or controller.

Speak to AXION

For complex vehicle-electronics diagnostics, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from Texas Instruments. The referenced design explains the principle; the vehicle-specific procedure determines the repair.