Patent ID: 10734873

Abstract:
A motor includes a rotation shaft, a magnet unit fixed to the rotation shaft to rotates with the rotation shaft, and a coil unit arranged to face the magnet unit in an axial direction. The magnet unit includes a magnet ring in which magnets are arranged in a circumferential direction of the rotation shaft, and a holding ring provided at an outer peripheral side of the magnet ring to hold the magnet ring. The holding ring includes a composite material in which a carbon fiber is impregnated with resin. The carbon fiber includes a pitch-based carbon fiber and a PAN-based carbon fiber. A volume ratio of the pitch-based carbon fiber is larger than that of the PAN-based carbon fiber in a portion at an outer peripheral side; a volume ratio of the PAN-based carbon fiber is larger than that of the pitch-based carbon fiber in a portion at an inner peripheral side.