To fully characterize a motor’s frequency response curve scientifically, an appliance for measuring motor performance is essential. At a minimum, measuring motor RPM under load while varying the PWM frequency will yield the frequencies where motor speed begins to drop and stall. A more sophisticated testing appliance adds sensors for measuring voltage, current, power, and torque.

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Motor Tester Conceptual Design

The motor tester used for this Learning Guide consisted of six fundamental components:

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Motor Tester Final Version

The motor tester's code, written in CircuitPython, exercises the test motor, applies a braking current to the brake motor to simulate a load, and measures the current drawn by the test motor. In addition, motor speed and torque are recorded throughout the test.

The data used to create the collection of performance charts for this learning guide were captured by this apparatus.

This guide was first published on Feb 23, 2021. It was last updated on 2021-02-23 15:22:04 -0500.

This page (A Motor Testing Appliance) was last updated on Apr 04, 2021.

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