In order to study the transmission performance and performance comparison of two kinds of structure squirrel-cage and compound solid type of drum-type adjustable speed permanent magnetic asynchronous couplers,the aim is to improve the transmission efficiency and power of permanent magnetic asynchronous couplers in different applications. Firstly,through finite element calculation,the effects of squirrel cage rotor slot parameters on transmission torque and starting torque of squirrel cage permanent magnetic asynchronous couplers and the effects of copper thickness on transmission torque and efficiency of compound solid type permanent magnetic asynchronous couplers are respectively discussed. Then,contrastive analyses of mechanical characteristics,temperature and adjustable speed characteristics for two magnetic coupling with the same structure parameters are carried out. The results indicate that the squirrel-cage permanent magnetic asynchronous couplers can provide higher output torque at high speed and can operate in higher output speed and transmit higher output power.