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This paper presents the design and electromagnetic characteristics analysis of a permanent magnet linear synchronous motor (PMLSM). The PMLSM is composed of a primary stator and a secondary mover, which are made up of three-phase copper windings and permanent magnets, respectively. The technical and economic targets of linear motor are directly related to the electromagnetic characteristics. However,...
Two magnetic fields produce radial force on rotor when the difference of their pole pair numbers is 1. Based on this principle, this paper introduces the bearingless motor with a single set of 5-phase windings. The MMF waveform produced by multiphase windings is analyzed, based on which the winding configuration of 5-phase bearingless motor is introduced. The two needed magnetic fields are produced...
Thrust ripple, determined by the magnetic field, is a significant factor to affect the performance of linear motor system. This paper evaluates the effect of the two magnet shapes, rectangle shape and Halbach array, for the flat short secondary type permanent magnet linear synchronous motor (PMLSM). A novel design that makes the PM into a curved shape is presented. Then, each shape analysis is fulfilled...
Several types of interior permanent magnet synchronous motor have been utilized in the wide rage of applications. The characteristics of their cogging torque and average torque and d and q- axis inductance were clarified for the different shapes of rotor magnet and two types of stator windings. This paper clarifies the characteristics of radial attractive force and vibration for the different shapes...
This paper describes an effective way to estimate state variables, such as motor speed and disturbance from visual signal by using a dual sampling rate observer. The dual sampling rate observer estimates the state variables at every DSP control period and corrects the estimation error at the instant that the measurement signal is detected. The effectiveness of the observer is verified through simulations...
In this paper, a general research for the design scheme of bearingless motors is presented. Bearingless motors are different from normal motors as both torque and radial forces are generated in one magnetic circuit in bearingless motors. Based on the known design of normal motors the reduction of the utilization factor C by the radial force generation is considered. By an iterative sequence a reduction...
In this paper, the principle of levitation force production for surface permanent magnet synchronous bearingless motors (SPMSBM) is introduced. The relationship of levitation force, magnet thickness and air-gap length in the SPMSBM was found based on the levitation force analytical model. The optimal thickness of permanent magnet to obtain the maximum controllable levitation force was studied and...
This paper concerns the analysis of and force ripple reduction method for a moving-magnet linear motor with a segmented stator. The system consists of multiple individually excited three-phase stator segments with an iron core and coils with concentrated windings and one translator with permanent magnets. Because of the segmentation of the stator, the translator experiences force ripples when it moves...
A novel idea employing Tubular Linear Permanent Magnet Synchronous Motors (TLPMSM) with two gas springs is presented in this paper. The mathematical model of TLPMSM is developed for the aim of controlling the stroke length of TLPMSM for drilling application. The control strategy based on transfer function model is designed. The simulation result of the control system shows the validity of design of...
The thrust ripples in permanent magnet linear synchronous motor are mainly generated by the distortion of the stator fluxlinkage distribution, reluctance force due to the relative position between the mover and stator, such as cogging force caused by the interaction between the permanent magnet and the iron slot, and the end effects. This is the significant drawback which will deteriorate the performance...
A new highly integrated 2times3 phase power electronics with digital controller is designed and implemented based on an existing 4 kW permanent-magnet type bearingless slice motor (BSM) with centrifugal pump developed by Levitronix GmbH Zurich. Firstly, general schematic and functional principle of bearingless slice motor pump system are briefly introduced. Secondly, analytical aspects of the bearingless...
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