A COST-EFFECTIVEamp;NBSP; SENSOR-LESSamp;NBSP; AND ENERGY-EFFICIENT BRUSHLESS DC MOTOR WITH EMBEDDED ELECTRONIC CONTROLLER FOR CEILING FANS

摘要

An electronically commutated motor to run a ceiling fan consisting of 1) a three phase Brushless DC motor without embedded rotor position sensors; 2) an embedded electronic controller consisting of a switched mode power supply with integrated active power factor correction an inverter and a micro-controller based control system with firmware to control the motor. The motor and the controller are designed to yield maximum efficiency at a commercially feasible cost. The motor construction is so designed as to simplify manufacturing process resulting in low cost per unit in mass manufacture. The controller detects the rotor position and starts the fan reliably every time without the use of a rotor position sensor. The motor embeds an infrared receiver which enables remote control of the ceiling fan. The fan is supplied power in the same way as a standard ceiling fan and hence existing wiring method can be used.