Motor reliability starts with measurable requirements, not attractive catalog claims. The U.S. Department of Energy’s Motor Systems Market Assessment reports that motor-driven systems use about 70% of industrial electricity. Globally, the International Energy Agency estimates electric motors consume roughly half of all electricity. Small efficiency losses become expensive when motors operate continuously. Reliability begins with the application.

Ask suppliers to document compliance with IEC 60034-1 and applicable IEC 60034-30-1 efficiency classes. Where relevant, NEMA MG 1 provides additional performance guidance for general-purpose motors. Confirm rated power, voltage, frequency, starting current, duty type, service factor, insulation class, and efficiency at the actual load.

Do not accept “high reliability” without test evidence. Request routine test records, vibration limits, temperature-rise data, and bearing specifications. IEC 60529 ingress ratings also matter in dusty or wet areas.

Operating conditions often defeat a correctly rated motor. Record ambient temperature, altitude, humidity, corrosive exposure, load variation, starts per hour, and variable-speed-drive use. ISO 20816 vibration guidance can support baseline acceptance checks. Derating may be necessary above standard altitude or temperature limits.

Field engineers frequently find that misalignment, poor ventilation, and frequent cycling cause earlier failures than manufacturing defects. Real plants are messier. I would also challenge an overly perfect specification; a motor selected for nominal load may struggle during peak starts. A 2026 sourcing review should compare lifecycle energy, maintenance access, spare-part availability, and documented test results, not purchase price alone.