Thrust ripple suppressing method of primary permanent magnet linear motor

Abstract

The invention discloses a thrust ripple suppressing method of a primary permanent magnet linear motor. Positioning force of the primary permanent magnet linear motor is obtained by measuring in practice by a finite element simulation or torque testing instrument. The waveform of the positioning force undergoes harmonic spectral analysis to confirm the component of base waves and main ultraharmonics in the positioning force. The no-load counter emf wave form of a finite element simulation motor is utilized to calculate out the three-phase current component which is used for counteracting the harmonic component of the positioning force so that additional electromagnetic force is equal to the component of the base waves and the main ultraharmonics in the positioning force in terms of amplitude, but opposite in terms of phase. Three-phase harmonic currents are filled into a current hysteresis vector control system to suppress thrust ripple of the permanent magnet linear motor. The body of the motor does not need transforming and a control strategy can be used for achieving suppression. The thrust ripple of the motor can be obviously hindered, noise in operation of the motor is reduced and characteristics of the motor such as no-load magnetic potentials and thrust outputting capability are kept unchanged.

Description

technical field [0001] The invention relates to a primary permanent magnet linear motor technology, in particular to a control method for suppressing thrust fluctuations of a primary permanent magnet linear motor, belongs to the technical field of motor drive and control, and is suitable for urban rail transit and other application occasions. Background technique [0002] With the continuous improvement of the performance of permanent magnet materials and the continuous improvement of the design and manufacturing technology of permanent magnet linear motors, permanent magnet linear motors have been widely used in industrial automation and rail transportation because of their high performance, high stability, low noise and high efficiency. widely used. The primary permanent magnet linear motor is a new type of permanent magnet brushless linear motor. Its structural feature is that the permanent magnet and armature winding are placed on the primary mover, and the secondary str...

AI Technical Summary

Problems solved by technology

However, because the structure optimization method is usually restricted by different types of motor structures, the effect of suppressing thrust fluctuations is limited; in addition, due to the modification of the motor structure, it will inevitably affect the no-load back EMF and power output capability of the motor, and at the same time It also increases the manufacturing cost, which makes this kind of optimization method for the motor body structure have certain limitations in the actual industrialization process

Images