Research On Permanent Magnet Motor Direct Drive System Of Jacquard Air Jet Loom

The traditional jacquard air jet loom mostly adopts vertical shaft drive,that is,a single large power and high starting torque asynchronous motor as the power source,through the belt pulley,bevel gear,spline telescopic universal joint and other transmission components,the loom spindle and jacquard machine spindle rotation.In view of the disadvantages of this drive mode,such as low system efficiency,inconvenient speed regulation,high noise and regular maintenance,a main drive system of direct-driven permanent magnet motor without vertical shaft was proposed.The design of direct-driven permanent magnet motor body and the proportional synchronous control of double motor speed were studied.For jacquard air-jet loom load torque between the minimum and maximum volatility brings difficult problem to the motor electromagnetic design,based on magnetic hot two-way coupling and the calculation method of successive approximation steady state temperature rise at multiple power levels in a loom main shaft as an example of electromagnetic design,by comparing the power level of temperature rise distribution,dynamic efficiency,permanent magnet magnetic,etc.,The proper rated power point was selected.At the same time,to meet the starting performance of jacquard air jet loom,the rotor hole was dug to reduce the moment of inertia of the motor.In order to ensure the quality of cloth,motor torque pulsation should not be too large.Maxwell and opti SLang coupling were used to optimize the design.The width of stator slot,rotor eccentricity and pole arc coefficient were taken as optimization variables,and the average value of torque pulsation and output torque were taken as optimization objectives to reduce torque pulsation.The simulation results show that the torque ripple was greatly reduced after optimization under the premise of good other performance,which can meet the load requirements of jacquard air jet loom spindle.In order to realize the speed proportional synchronization between loom spindle and jacquard spindle,the synchronous control of double motors was studied.Aiming at the problem of large speed fluctuation caused by real-time load disturbance,based on the MTPA control of single motor,the load reduced order torque observer was used to observe the real-time load torque,and the feedback coefficient is feedforward to the input of current controller,so as to achieve the purpose of strong anti-interference ability and excellent steady-state performance.The simulation results show that the feedforward compensation strategy based on load torque can well suppress the speed fluctuation caused by load torque disturbance.For the traditional cross coupled dual motor synchronous control,there are problems that the speed can not follow quickly,the speed deviation is too large after being disturbed,and the synchronization time is long.An improved deviation coupling control strategy was adopted,that is,the speed deviation was compensated to the input of the current controller through the feedback coefficient to improve the speed synchronization performance.The simulation results show that the improved cross coupling synchronous control strategy has small speed deviation,strong anti-interference ability and good speed synchronization.A loom spindle direct drive permanent magnet motor was developed,a prototype experimental system was built,and the electromagnetic performance was tested.The experimental results were consistent with the finite element simulation,which verified the effectiveness and accuracy of the electromagnetic design.