Design of Dual-Rotor Permanent Magnet Ring Torque Motor for NC Rotary Table

　　Design of Dual-Rotor Permanent Magnet Ring Torque Motor for NC Rotary Table
　　Modern CNC rotary table is needed with high torque, high accuracy, high speed ratio, until the zero-speed positioning. At the same time ask for a higher dynamic stiffness and static stiffness. When need low-speed and high torque, the induction motor and gearbox are usually combined. Gearbox is high cost, which needs repair and results in reducing the system’s efficiency and accuracy. Therefore, the removal of the gearbox is very favorable. This could be the use of permanent magnet synchronous motor (PMSM) directly to low-speed operation, and this is the so-called direct-drive permanent magnet synchronous motor. Abolished the worm wheel and worm mechanical transmission http://www.999magnet.com/products/108-alnico-magnets chain, using of direct-drive ring structure torque motor, is one of the main way to achieve high-precision CNC rotary table efficiently. In the National Natural Science Fund, the thesis studies a novel direct-drive torque motor-NC turntable dual-rotor permanent magnet ring torque motor for NC rotary table. Because of its special structure, it will have high torque density, high precision.The characteristic of direct drive permanent magnet ring torque motor is analyzed. According to the requirement of high torque density and low torque ripple, the motor application place, and practical design experience, the initial electromagnetic solution is determined, which adopts outer rotor, multi-pole, magnet surface mounted, fractional-slot non-overlapping winding, stator-cooled and so on. Considering the structure specialty and the precision requirement of the motor design, the finite element analysis method is directly applied to the electromagnetic analysis and calculation.In the way of restraining the torque ripple, the torque performance of the motor is optimized. Have an investigation on the pole-slot combinations for permanent-magnet machines with concentrated windings, choose the favorite pole-slot combinations. At the same time calculate y=1 the winding factor, and reduce the cogging torque by changing the size of inner and outer stator notch and changing inner and outer rotator pole-arc coefficient. To prove the feasibility of this method, using finite element analysis software for the torque is calculated, given the torque curve. Through the comparative analysis, prove the feasibility of this method-changing the size of inner and outer stator notch and changing inner and outer rotator pole-arc coefficient. 更多还原