A brushless DC permanent-magnet motor used in elevator door operators or small traction machines, offering precise speed control, high efficiency, and low maintenance compared with brushed DC motors.
Full Definition
BLDC (Brushless DC) motors use electronic commutation via a motor controller rather than mechanical brushes and commutator, eliminating brush wear and radio-frequency interference. In elevator applications, BLDC motors are most commonly used in door operator drives (150–400 W range) where their high torque-to-inertia ratio enables fast, accurate door speed profiles. They are also found in small home-lift traction machines (1–5 kW) and rack-and-pinion drive units. The motor controller provides sinusoidal or trapezoidal commutation based on Hall-effect sensor or encoder feedback. Efficiency at rated load typically exceeds 90%. For elevator door operators, the BLDC controller implements programmable open/close speed profiles, obstruction detection via current monitoring, and integration with the car door coupler engagement logic. Temperature rise limits and encoder integrity are key maintenance checkpoints.
