How to select correct neodymium magnet grades for different types of motors?

Choosing proper magnet grade prevents irreversible demagnetization for motor project.  As a wholesale  neodymium magnets supplier and custom NdFeB magnet manufacturer, we share practical selection tips. E‑bike mid‑drive motors under heavy load adopt N42SH or N45SH high temperature resistant neodymium magnet. Servo motor for industrial automation commonly pick N42H‑N45H. For robot vacuum fan motor, N40M‑N42M works well under moderate heat. When continuous operating temperature exceeds 150℃, UH series grades are required. Never only chase high magnetic energy product without considering actual working temperature. Tell us your motor type, working temperature and quantity, we can offer customized magnet solutions and bulk wholesale service.