This guide turns an open-ended Johnson Electric motor search into a practical screening sequence for brushed DC, BLDC, stepper and linear actuator programs.
List required output torque, speed, stroke, travel time, load direction, voltage and target package size. Add peak events such as jam, stall, shock or manual override because they often drive gearhead and actuator choices. If the load is uncertain, describe the mechanism and the advisor can suggest a measurement method.
Estimate duty cycle, ambient temperature and allowed surface temperature. A motor that meets a short bench test may drift out of range in a sealed appliance, seat module or handheld medical device after repeated use. Include the longest expected run time, rest time and enclosure conditions.
Define cycle count, acoustic limit, vibration, ingress, material data and quality evidence before samples ship. That keeps the shortlist tied to the test plan rather than to a catalog table alone. For automotive and medical programs, list PPAP, ISO 13485 or material requirements at the same time as performance goals.
A drawing is helpful, but the most useful package is a one-page application summary: voltage window, rated and peak load, target rpm, stroke, duty cycle, noise target in dBA, ambient range, annual volume, launch region and required documentation. If you only have a competitor part number, include the product function and what problem you are trying to solve, such as current draw, cost, noise, supply continuity or package size.
The selection guide also helps teams avoid a common mistake: treating motor diameter as the first decision. Package size matters, but the correct answer usually appears after the duty point, thermal window and validation path are visible. A smaller motor may need a different winding or gear ratio; a larger motor may reduce current but exceed noise or envelope limits. Linear actuators add another layer because screw pitch, gear reduction, limit switches and expected axial load work together. By submitting these details early, you make the Johnson Electric response more useful for engineering, purchasing and quality at the same time.
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