In this paper, a novel variable-leakage-flux interior permanent magnet (VLF-IPM) motor is proposed, which kind of mechanical flux-adjusting PM motor. The VLF-IPM can obtain the advantages IPM and overcome difficulty to adjust airgap flux by locating self-activating device that introduced in paper on rotor. effect barriers leakage circuit analysed establishing rotor parametric model clarify infl...

The stationary discontinuous armatures that are used in permanent magnet linear synchronous motors (PMLSMs) have been proposed as a driving source for transportation systems. However, the stationary discontinuous armature PM-LSM contains the outlet edges which always exist as a result of the discontinuous arrangement of the armature. For this reason, the high alteration of the outlet edge coggi...

Fractional calculus is a generalization of the integration and differentiation to the fractional (non-integer) order. In this paper, for the first time, we devised a fractionalorder adaptive compensation (FO-AC) method for cogging effect minimization for permanent magnetic synchronous motors (PMSM) position and velocity servo system. Cogging effect is a major disadvantage of PMSM. In our FO-AC ...

Cogging effect is a serious disadvantage of the permanent magnetic synchronous motor (PMSM), and cogging force is a positiondependent periodic disturbance. In our previous work [1], a dual highorder periodic adaptive learning compensation (DHO-PALC) method for state-dependent periodic disturbance was presented, where the long term stability issue was not addressed. Due to the impact of the high...

I . Introduction Multi-phase machines offer several key features, such as high reliability, high torque density, and high efficiency . Therefore, they are obtained wide applications from automotive to aerospace [1][2] . One of them is the five-phase PM machine, where the torque density can be improved by injecting third harmonic current . However, in order to maintain high torque density and re...

Permanent magnet (PM) machines inevitably suffer from cogging force, which does not contribute to the average output torque (force) but contributes as a type of ripple. This paper provides an overview force reduction methods for different types PM machines. First, systematic and comprehensive categorization kinds is given according principle. Then, are analyzed discussed based on categorization...

In this paper, an analytical method based on the series transform and skewed slot structure of rotor is adopted to reduce cogging torque variable flux memory permanent magnet (VFMPM) machine. Firstly, theory analysis VFMPM machine was completed. Secondly, a simulation model established, aiming at calculating verifying correctness above method. Thirdly, prototype 14 slots 12 stator manufactured,...