Abstract：The influence of 3 kinds of pole array to output torque of cylindrical permanent magnet adjustable speed drives( CPMASD) was studied using finite element simulation technology. The 3 kinds of pole array are Halbach arrays M_2 which Pole Width Coefficient( PWC) is k = 1,M_3 which PWC is k≠1,and the traditional poles array M_1 which is radial magnetized and PWC is k = 1 respectively. The result shows that M_3 has the greatest torque,hardest mechanical properties and better working stability in the 3 kinds of pole array. When slip ratio is 3. 5%,the output torque of M_3 increases with k if k < 3. 2,and it decreases when k > 3. 2,and at k = 3. 2,the output torque has the maximum value. When k changes in the range of 2. 3 ~ 4,the variation range of output torque is no more than 1% of its maximum value. Therefore,when it is designed CPMASD,the coefficient of M_3 is k≥2. 3.

Keyword：cylindrical permanent magnet adjustable speed drives;Halbach;finite element simulation technology;