Brushless DC moter preventing magnetization of rotor shaft and shaft eddy current

摘要

PURPOSE: A brushless direct current motor for preventing a magnetic field formation and a shaft eddy current generation in a rotor shaft and a manufacturing method thereof are provided to reduce a cogging torque and a torque ripple by suppressing the formation of a magnetic field on the rotor shaft when a direct current motor operates. CONSTITUTION: A rotor of a motor isolates the magnetic field of a permanent magnet being formed on a rotor shaft and suppresses a shaft eddy current being generated on the rotor shaft by inserting insulating materials, such as bakelite, aluminium, and synthetic resin, between the permanent magnet and a rotor core. The rotor of the motor suppresses the shaft eddy current being generated on a central shaft by inserting the isolating materials between the permanent magnet and the rotor core to isolate the magnet field of the permanent magnet being formed on the rotor shaft.