Fast-response surface-mounting type external rotor permanent magnet synchronous motor

The invention discloses a fast-response surface-mounting type external rotor permanent magnet synchronous motor, and relates to an external rotor permanent magnet synchronous motor. Permanent magnets are pasted on the surface of the internal periphery of an external rotor, and the interior of the iron core of the rotor is provided with a slot parallel with the direction of a magnetic force line. A magnetic force line of main magnetic flux does not pass through a non-magnetic-conduction medium. The motor can further reduce the q-axis inductance on the basis of guaranteeing the original motor performances, enables the q-axis inductance to be less than d-axis inductance, and improves the servo response speed. A plurality of permanent magnets are sequentially arranged and pasted on the internal peripheral surface of the iron core, and carry out magnetization in a radial or axial direction. Each two adjacent permanent magnets have the opposite polarities. A part, close to the external peripheral edge, of the iron core is provided with a plurality of slotting units, and two adjacent ends of each two adjacent permanent magnets are corresponding to one slotting unit. The motor is suitable to serve as a motor needing fast servo response.