A drive control method for a three-phase single-winding bearingless motor

Abstract

The invention discloses a drive control method of a three-phase single-winding bearingless motor. The drive control method performs closed-loop control on the rotational speed to obtain a current signal of one circuit , through the closed-loop control of the levitation force, three current signals are obtained , and ; and then respectively with , and Three sets of current control signals are formed, which respectively pass through current controllers a, b and c to independently control the three areas a, b and c of a set of armature windings of a three-phase single-winding bearingless motor, and at the same time realize the rotor self-suspension and rotation. The invention overcomes the problem of the coupling relationship between the two sets of windings of the double-winding bearingless motor and the included angle between the two sets of windings, can effectively eliminate the coupling relationship between the torque and the suspension force, and improves the stability and reliability of the system.

Description

technical field [0001] The invention is a drive control method of a bearingless motor, more precisely, a drive control method of a single-winding bearingless motor, which is suitable for special electric drive fields such as aerospace, flywheel energy storage, and numerical control machine tools. Background technique [0002] Bearingless motors have the advantages of no friction and wear, no lubrication, high speed and high precision, high power density, and maintenance-free. In addition to high-speed operation fields such as flywheel energy storage and CNC machine tools, they are also used in pure clean rooms, vacuum technology, and corrosive media. , And special fields such as aseptic workshops also have broad application prospects. At present, most of the bearingless motors adopt two sets of winding control modes of torque and suspension force, that is, the actual speed is obtained through the closed-loop detection of the speed, compared with the given speed, and the torq...

AI Technical Summary

Problems solved by technology

At present, most of the bearingless motors adopt two sets of winding control modes of torque and suspension force, that is, the actual speed is obtained through the closed-loop detection of the speed, compared with the given speed, and the torque winding current for controlling the speed is obtained through the corresponding algorithm. The actual radial displacement is obtained through the closed-loop detection of the suspension force, compared with the given suspension force, and the current of the suspension force winding to control the suspension force is obtained through the corresponding algorithm. Obviously, the current control method is equivalent to the bearingless motor as two motors , using two sets of inverters to control two sets of windings respectively, this control method has the following serious shortcomings: the two sets of windings will be coupled to each other and affect each other, especially the angle between the two sets of windings is difficult to determine, Therefore, it will respond to the dynamic and static characteristics of the motor's levitation force, electromagnetic torque, and speed. If the angle between the two sets of windings is too large and exceeds a certain range, the bearingless motor will not be able to achieve levitation operation.

[0003] The single-winding bearingless motor is the latest research on a bearingless motor. The research reported so far is only the multi-phase single-winding bearingless permanent magnet motor, which uses different control free planes in the multi-phase motor to control the bearingless permanent magnet motor separately. The suspension and rotation of the three-phase single-winding bearingless motor drive control has not been reported so far

Images