Design And Performance Analysis Of High Voltage Self-starting Permanent Magnet Motor

Large-capacity motors usually use high voltage.Compared with low-voltage motors,high-voltage motors can reduce the stator current.It has more advantages in controlling the start and stop of the motor.High-voltage asynchronous motors can start automatically,but the high-efficiency area and high-power factor area are relatively narrow;high-voltage synchronous motors have relatively high efficiency and power factors,but they cannot start automatically;high-voltage asynchronous motors combine the advantages of the above two motors and have high High power factor of efficiency and self-starting at the same time,but it has the disadvantages of complex structures such as brushes and slip rings,large air gap and complex rotor excitation system.The high-voltage self-starting permanent magnet motor combines the advantages of the above three types of motors.When the motor is running,it is in a synchronous state,and the motor efficiency and power factor are high;the existence of the guide bar makes the motor self-starting.At the same time,it has the characteristics of simple structure,no need for a rotor excitation system,and small air gap of the motor.It has a wide range of application prospects.The main contents of this article are as follows:Research the factors such as asynchronous torque and generator braking torque related to starting performance.Analyze the no-load back-EMF and other factors related to the motor’s pull-in performance.The influence of parameters such as different rotor slot numbers,different rotor depth slot ratios and no-load back EMF on the starting performance of the motor is analyzed.When the motor is starting,consider the capacity of the transformer and the drop in the output voltage of the transformer caused by the excessive starting current,and study the starting performance of the motor with the minimum supply voltage under the rated load.Analyze the design requirements of the electromagnetic scheme of the motor.It is mainly considered from the perspectives of stator and rotor design,magnetic circuit design,and air gap selection.Compare the motor performance under different stator slots and different permanent magnet structures,and complete the electromagnetic scheme design of the motor.Since the starting current of the self-starting permanent magnet motor is large,the demagnetization of the high-voltage self-starting permanent magnet motor during the starting process is studied.Check whether the motor will demagnetize.Calculate the loss of each part of the motor.And simulate the temperature rise of the motor under this loss.Measure the no-load back EMF of the prototype,and conduct temperature rise experiments and working characteristics experiments.Analyze the working performance of the prototype and compare it with the simulation results.