The utility model discloses a two sides permanent magnetism servomotor that exerts oneself, including stator and rotor, the stator sets up to two sets of, and stator and back stator before being respectively, rotor include pivot and carousel, and on the carousel was fixed in the pivot, clamping carousel in the middle of preceding stator and the back stator, an even annular embedding even number permanent magnet in the carousel, the end of permanent magnet were extremely towards the quotation of carousel, and just the end in the same quotation of adjacent permanent magnet is extremely different, the utility model discloses guaranteeing to have realized reducing of motor weight and size under the same power, it is less to have satisfied installation space, the great demand of power take off,and application scope is wide, has good market using value.