Brushless direct current motor rotor capable of limiting permanent magnets

The utility model discloses a brushless direct current motor rotor capable of limiting permanent magnets, which relates to the field of motors and comprises a rotor iron core, and four clamping grooves are arranged on the outer surface of the rotor iron core. According to the utility model, the permanent magnet and the clamping groove are respectively provided with the connecting groove I and the connecting groove II, and the limiting plate is movably connected with the connecting groove I and the connecting groove II, so that the permanent magnet is fixed in the clamping groove through the connection of the limiting plate with the connecting groove I and the connecting groove II, and the permanent magnet is prevented from being separated from the clamping groove; meanwhile, a screw rod is arranged in a limiting plate and connected with insertion holes formed in a first connecting groove and a second connecting groove, so that the limiting plate is fixed in the first connecting groove and the second connectin