Polar-coordinate conversion-based magnetic-field determination method of cylindrical linear oscillation motor

Abstract

The invention discloses a polar-coordinate conversion-based magnetic-field determination method of a cylindrical linear oscillation motor. Firstly, structure parameters of the cylindrical linear motorare determined, and an oscillation model of the cylindrical linear motor under a cylindrical coordinate system is established; then equivalence processing is carried out on the oscillation motor model, and a coordinate transformation method is employed to convert a solving coordinate system from the traditional cylindrical coordinate system to a polar coordinate system for analysis; then a methodof separation of variables and a subdomain method are combined to carry out region dividing on the model under the polar coordinate system, and Laplace equations or Poisson equations of all regions are listed; and finally, boundary conditions and interface conditions of a magnetic field are utilized to solve general-solution equations of all the above-mentioned regions, and thus electromagnetic performance of the linear oscillation motor is obtained.

Description

technical field [0001] The invention belongs to the fields of electric engineering and motors, and relates to a permanent magnet synchronous linear motor. Background technique [0002] The cylindrical permanent magnet linear motor is a new type of permanent magnet linear motor, which has the advantages of both permanent magnet motors and linear motors. Compared with the traditional "rotary motor + ball screw" transmission method, it adopts the direct drive method, which has the advantages of no intermediate transmission link, high rigidity, high thrust, fast response speed, outstanding advantages of energy saving, and maintenance-free. Therefore, it is widely used in hoisting systems, high-performance servo drives and other occasions. [0003] The cylindrical permanent magnet linear motor is similar to the rotary motor. When the primary winding of the linear motor is fed with three-phase symmetrical AC current, a traveling wave similar to the rotating magnetic field will be...

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Problems solved by technology

If the influence of the edge effect of the linear motor is ignored, the additional loss of the motor will increase, and the effective output of the motor will decrease, which will seriously affect the performance and requirements of the linear motor.

However, using the sub-domain method for partition processing can take into account the end effects on both sides of the motor. However, using this method requires a large number of magnetic field boundary conditions and junction conditions, and writing multiple sets of partial differential equations requires the Besser Carrier function to solve, the solution process is complex and cumbersome

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