Marcin Wardach, Ryszard Palka, Piotr Paplicki and Michal Bonislawski
Permanent magnet (PM) electrical machines are becoming one of the most popular type of the machines used in electrical vehicle drive applications. The main drawback of permanent…
Abstract
Purpose
Permanent magnet (PM) electrical machines are becoming one of the most popular type of the machines used in electrical vehicle drive applications. The main drawback of permanent magnet machines, despite obvious advantages, is associated with the flux control capability, which is limited at high rotor speeds of the machine. This paper aims to present a new arrangement of permanent magnets and flux barriers in the rotor structure to improve the field weakening control of hybrid excited machines. The field weakening characteristics, back-emf waveforms and efficiency maps of this novel machine have been reported.
Design/methodology/approach
In the study, finite element analysis was used to perform simulation research. Then, based on the simulation studies, an experimental model was built. The paper also presents selected experimental results.
Findings
Obtained results show that the proposed machine topology and novel control strategy can offer an effective flux control method allowing to extend the maximal rotational speed of the machine at constant power range.
Practical implications
The proposed solution can be used in electric vehicles drive to extend its torque and speed range.
Originality/value
The paper presents original design and results of research on a new solution of a hybrid excited machine with magnetic barriers in a rotor.
Details
Keywords
Piotr Putek, Piotr Paplicki and Ryszard Pałka
In this paper, a numerical approach to the topology optimization is proposed to design the permanent magnet excited machines with improved high-speed features. For this purpose…
Abstract
Purpose
In this paper, a numerical approach to the topology optimization is proposed to design the permanent magnet excited machines with improved high-speed features. For this purpose the modified multi-level set method (MLSM) was proposed and applied to capture the shape of rotor poles on the fixed mesh using FE analysis. The paper aims to discuss these issues.
Design/methodology/approach
This framework is based on theories of topological and shape derivative for the magnetostatic system. During the iterative optimization process, the shape of rotor poles and its evolution is represented by the level sets of a continuous level set function f. The shape optimization of the iron and the magnet rotor poles is provided by the combining continuum design sensitivity analysis with level set method.
Findings
To obtain an innovative design of the rotor poles composed of different materials, the modified MLSM is proposed. An essential advantage of the proposed method is its ability to handle a topology change on a fixed mesh by the nucleating a small hole in design domain that leads to more efficient computational scheme then standard level set method.
Research limitations/implications
The proposed numerical approach to the topology design of the 3D model of a PM machine is based on the simplified 2D model under assumption that the eddy currents in both the magnet and iron parts are neglected.
Originality/value
The novel aspect of the proposed method is the incorporation of the Total Variation regularization in the MLSM, which distribution is additionally modified by the gradient derivative information, in order to stabilize the optimization process and penalize oscillations without smoothing edges.
Details
Keywords
Michal Cichowicz, Wojciech Pilecki, Marcin Wardach, Paweł Prajzendanc, Kamil Cierzniewski and Ryszard Palka
This paper aims to present the project of a permanent magnet synchronous machine which can be used as generator in the vertical axis wind turbine.
Abstract
Purpose
This paper aims to present the project of a permanent magnet synchronous machine which can be used as generator in the vertical axis wind turbine.
Design/methodology/approach
In the study, finite element analysis was used to perform simulation research of electrical machines. Based on the simulation studies, an experimental model was built. The paper presents also selected experimental results.
Findings
During the research, it was found that the radial arrangement of the permanent magnets is more favorable than the tangential one for the selected structure of the generator with permanent magnets.
Research limitations/implications
During the experimental research, a problem was encountered involving the correct control of the constructed generator at low rotational speeds.
Practical implications
The proposed solution can be used in low-speed vertical axis wind turbines.
Social implications
The presented research fits the global trend toward the use of alternative and renewable energy sources.
Originality/value
The paper presents new simulation studies of two low-speed generator topologies. The results for the radial and tangential arrangement of the permanent magnets in the rotor were verified. Based on this research, an experimental prototype of a generator for a slow-speed vertical axis wind turbine was built.