Core Losses and Machine Design for Electric/Hybrid Vehicles

电动/混合动力汽车的磁芯损耗和机器设计

• 批准号: 357449-2013
• 负责人: Pillay, Pragasen
• 金额: $ 2.99万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572769
• 关键词: Core; Losses; Machine; Design; Electric

The area of core losses in electrical machines is of growing interest as higher speed machines are being designed with complicated geometries, leading to complex flux patterns. The fluxes may be primarily alternating, but a significant portion of the machine experiences a rotational loss, an area in which very little work has been done. The work proposed is divided into three sections. The first is to develop more accurate models for waveforms that are primarily pulsating. The applicant has found that fundamental errors are being made in the separation of losses into eddy currents and hysteresis because of how the measurements are made. In typical Epstein specimens the entire flux is measured flowing in the lamination, yet as frequency increases, skin effect takes over and there is a variation in the magnitude and phase of flux density within the thickness of the lamination. More accurate modeling has allowed this variation to be taken into account, but this must still be translated into more accurate calculations of the actual losses. Some fundamental work in the measurement of rotational iron losses in machines have been done recently. A new test fixture has been designed and built and limited tests have been conducted. The purpose of this task is to advance the measurement to include non-sinusoidal excitations, while the flux is rotating and to include a wider range of materials and gauges. On the modeling side, fundamental work needs to be done on developing a formula for hysteresis and eddy current losses while the flux is rotating, similar to what has been done for pulsating fluxes. The third task is to use the results in the core loss modeling to design a new synchronous reluctance motor with low torque ripple, without the need for skewing. Skewing of the stator or rotor increases the manufacturing complexity. Also the average flux density is reduced. A new technique related to the orientation of the ribs in the rotor is proposed which can allow torque ripple minimization in the absence of skewing.

由于更高的速度机的设计具有复杂的几何形状，导致复杂的通量模式，因此电机中核心损失的区域引起了人们的关注。磁通量可能主要是交替的，但是机器的很大一部分经历了旋转损失，在很少做的工作区域。建议的工作分为三个部分。 首先是为主要脉动的波形开发更准确的模型。申请人发现，由于如何进行测量，在将损失分离为涡流和磁滞时正在犯基本错误。在典型的爱泼斯坦标本中，整个通量在层压板中进行了测量，但是随着频率的增加，皮肤效应接管了，并且在层压厚度内的通量密度的大小和相位存在变化。更准确的建模可以考虑这种变化，但这仍然必须转化为对实际损失的更准确的计算。 最近已经完成了计量机器旋转铁损失的一些基本工作。已经设计和建造了一个新的测试固定装置，并进行了有限的测试。此任务的目的是提高测量值，以包括非螺体激发，而通量正在旋转并包括更广泛的材料和仪表。在建模方面，需要在通量旋转时开发用于磁滞和涡流损失的公式的基本工作，类似于脉动通量所做的事情。 第三个任务是使用核心损耗模型中的结果来设计具有低扭矩波纹的新同步不情愿电动机，而无需偏斜。定子或转子的偏斜会增加制造的复杂性。同样，平均通量密度也会降低。提出了一种与转子中肋骨方向相关的新技术，该技术可以在不存在偏斜的情况下允许扭矩纹波最小化。