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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=637093
• 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.

随着高速机器被设计成具有复杂的几何形状，导致复杂的磁通模式，电机中的磁芯损耗领域越来越受到人们的关注。通量可能主要是交替的，但机器的很大一部分会经历旋转损失，在该区域中几乎没有做功。拟议的工作分为三个部分。首先是为主要是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，在将损耗分为涡流和磁滞时会产生根本性错误。在典型的爱泼斯坦样本中，测量的是在叠片中流动的整个通量，但随着频率的增加，趋肤效应开始出现，叠片厚度内通量密度的大小和相位会发生变化。更准确的建模允许考虑这种变化，但这仍然必须转化为对实际损失的更准确的计算。最近已经完成了测量机器旋转铁损的一些基础工作。设计并建造了新的测试夹具并进行了有限的测试。此任务的目的是推进测量，以在通量旋转时包括非正弦激励，并包括更广泛的材料和规格。在建模方面，需要完成基础工作来开发磁通旋转时磁滞和涡流损耗的公式，类似于脉动磁通所做的工作。第三项任务是利用磁芯损耗建模的结果来设计一种具有低扭矩脉动且无需偏斜的新型同步磁阻电机。定子或转子的倾斜增加了制造复杂性。平均磁通密度也降低。提出了一种与转子中肋的方向相关的新技术，该技术可以在不存在偏斜的情况下最小化扭矩脉动。