Abstract
This paper presents the design of a drive system for a low-power fan. This system consists of a brushless DC motor (BLDC) and a low-voltage inverter. The rotor of the motor is built of four offset layers, inside which permanent magnets are placed. This design minimizes the cogging torque of the machine and guarantees trouble-free operation (no possibility of magnets breaking off). A lowvoltage inverter provides motor speed control over a wide range and limits the motor's starting current. The paper explains the algorithm of sensorless control reducing the price of the drive (no position sensors and their wiring), compares the legacy motor with the new motor and shows a significant reduction in power consumption of the new drive.
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